Section B - GENERAL IRRIGATION SPECIFICATIONShydrogold.com/jgp/pdf/doc_its_2.pdf · GENERAL IRRIGATION SPECIFICATIONS ... 21 IRRIGATION CONTROL SYSTEM ... be completed and submitted

Section B - GENERAL IRRIGATION SPECIFICATIONS (Version 0.0 - 1 Jan 2007)

GENERAL IRRIGATION SPECIFICATIONS - CONTENTS 1 ABOUT THESE SPECIFICATIONS ................................................................................................... 1

2 DOCUMENT HIERARCHY................................................................................................................. 1

3 CONFORMING BIDS AND ALTERNATIVES................................................................................... 1

4 PREAMBLE .......................................................................................................................................... 2

5 IRRIGATION PUMP STATIONS........................................................................................................ 8

6 FERTIGATION SYSTEMS................................................................................................................ 14

7 TRANSFER PUMP STATIONS ......................................................................................................... 16

8 BOOSTER PUMP STATIONS ........................................................................................................... 20

9 PRESSURE-REDUCING VALVES.................................................................................................... 23

10 STAKING OF IRRIGATION SYSTEM COMPONENTS................................................................. 23

11 TRENCH WORK ................................................................................................................................ 27

12 PIPE WORK........................................................................................................................................ 29

13 THRUST RESTRAINT SYSTEM FOR MAINLINE......................................................................... 34

14 DRAINAGE (SCOUR) VALVES........................................................................................................ 34

15 AIR VALVES ...................................................................................................................................... 35

16 ISOLATION VALVES........................................................................................................................ 35

17 QUICK COUPLING VALVES (QCVS) ............................................................................................. 36

18 REMOTE CONTROL VALVES (RCVS)........................................................................................... 36

19 VALVE BOXES................................................................................................................................... 36

20 SPRINKLERS ..................................................................................................................................... 37

21 IRRIGATION CONTROL SYSTEM ................................................................................................. 37

22 DOCUMENTATION........................................................................................................................... 46

23 TRAINING .......................................................................................................................................... 49

24 SPARES ............................................................................................................................................... 50

25 TESTING PROCEDURES.................................................................................................................. 50

26 HANDOVER........................................................................................................................................ 52

27 PRACTICAL COMPLETION............................................................................................................ 52

28 DEFECTS LIABILITY PERIOD........................................................................................................ 54

29 TYPICAL ASSEMBLY SKETCHES ................................................................................................. 54

Copyright © 2007 - Hydrogold Pty Ltd General Irrigation Specifications - Version 0.0 - 2 January 2007 - Page B1

Copyright ©2007:The information contained in this document is the property of Hydrogold Pty Ltd. Reproduction and or transfer of this information to parties other than those to which the document is addressed is not permitted without written approval of Hydrogold Pty Ltd. Sighting of this document is evidence of acceptance of these conditions.

1 ABOUT THESE SPECIFICATIONS These are General Irrigation Specifications. Some items mentioned in this General Irrigation Specifications may not be required to be installed on this project. Refer to the Special Irrigation Specifications, Bill of Quantities, Irrigation Drawings and other documentation.

2 DOCUMENT HIERARCHY The correct interpretations will be made in the following order of precedence: 2.1 Addendum to the issue of tender documentation (if any)

or written correspondence during the tender period (that is, from the issue of tender documentation to award of the contract);

whichever is issued later. 2.2 Conditions of Contract

2.3 Irrigation Bill of Quantities

2.4 Special Irrigation Specifications (including sketches)

2.5 Irrigation Drawings

2.6 General Irrigation Specification (including sketches)

2.7 Contractor's Submissions

3 CONFORMING BIDS AND ALTERNATIVES It is critical for the Contractor to submit a fully conforming bid without any qualifications for the acceptance and assessment of their bid.

3.1 The Contractor must submit a bona-fide, fully conforming bid without any qualifications to contractual conditions (including these technical specifications). If the Contractor fails to comply with this requirement, then they will forfeit any tender deposit.

3.2 Section B (Contractor's Submission) and Section C (Bill of Quantities) are to be completed and submitted with the tender documents.

3.3 If the Contractor submits any alternative proposal but fails to submit a fully conforming bid, then that bid may, at the Employer's discretion, be considered invalid and the Contractor will forfeit any tender deposit.

3.4 Any alternatives or qualifications must be itemised along with their respective cost deductions or increases for the Employer's consideration.


4 PREAMBLE

4.1 Definition of Terms

4.1.1 The "Employer" refers to the Employer of the Contractor or their appointed representative.

4.1.2 The "Contractor" refers to the Tenderer, Contractor, Irrigation Contractors, Subcontractor or Nominated Subcontractor as contextually applicable.

4.1.3 The "Pump Station" refers to the assembly of pumps, motors, electrical components and ancillary equipment as defined in the specifications.

4.1.4 The "Pump House" refers to the building structure that houses the pump station including the floor but excluding the pad that the pump station sits on.

4.2 Statutory Requirements

4.2.1 The statutory requirements of the country in which the installation occurs will apply to this specification.

4.2.2 The Contractor must comply with all local statutory requirements, which will override the specification where there is a conflict.

4.2.3 Quality Assurance The Contractor will guarantee all workmanship and materials. They will rectify any defects arising from sub-standard works.

4.3 Existing Services

4.3.1 The Contractor will at all times be responsible for locating and avoiding any and all existing services within the area of the Works.

4.3.2 This would include (but not be limited to) such services as electrical power, telecommunication lines, storm water drains, sewerage, rising mains, drinking water mains, gas mains, etc.

4.3.3 The location of these services may be obtainable from the Employer or the relevant authorities.

4.3.4 Should the Contractor damage an existing service, they will be responsible to repair such damage at their own expense.

4.3.5 The Contractor will immediately notify the Employer upon the discovery of previously unknown services or obstructions.


4.4 Variations to Contract

4.4.1 Indicative Nature of Drawings

a) The layout of product and equipment as shown on the drawings is indicative only and exact locations will be confirmed with the Employer prior to installation.

b) Minor on-site alterations that do not significantly change the quantities of materials used will not be claimed as extras (variations) to the contract. This includes the location of sprinklers, valves and pipe routing.

4.4.2 Approval of Variations

a) The Employer will approve in writing any variation to the contract prior to the execution of works involving variations.

b) Works executed without such approval will be deemed within the existing scope of the contract and not subject to a variation order.

4.4.3 Bill of Quantities - Schedule of Rates a) The Bill of Quantities submitted by the Contractor with

itemised quantities and rates will constitute the 'Schedule of Rates'.

b) In the event of variations to the contract, the Schedule of Rates will be used as the basis for variations.

c) However, should the quantity of any item vary by more than 10% of that stated in the Schedule of Rates as submitted by the Contractor, then the rates will be subject to renegotiation. The only basis for renegotiation will be changes in the cost of the product. The Contractor is to provide supporting documentation (for example invoices). The rates charged for installation will remain the same.

4.4.4 Units of Measurement

The definitive units of measurement are metric SI (System International). Where a discrepancy exists between units of measurements, the SI units (metric) will take precedence over all other units.


4.5 Materials/Equipment Used

4.5.1 Brand New

Unless specifically approved by the Employer in writing, all materials and equipment installed, with the exception of temporary works, will be brand new (unused) and in good condition.

4.5.2 Samples If requested by the Employer, the Contractor is required to make available samples of materials for inspection before the placement of purchase orders. This is to facilitate product approval prior to the placement of purchase orders. It only applies to pipes, pipe fittings (including valves and valve boxes), primer, solvent cement, electrical cables and joiners.

4.5.3 Product Approvals Approval by the Employer of a product does not relieve the contractor of their responsibility to adhere to specifications unless such deviation is specifically noted in the approval.

4.5.4 Continuity of Brand

a) After a product has been approved by the Employer, the Contractor will continue to use the same brand consistently throughout the contract.

b) Product substitution will (in general) not be allowed.

c) Should approval of a substitution be given, the Employer must not be disadvantaged, either in terms of quality or cost.

4.5.5 Warranties

a) The Contractor will pass any warranties on products that extend past the end of the Defects Liability Period into the name of the Employer. That is, the manufacturer will warrant these products direct to the Employer.

b) Warranty certificates will specify the terms of the warranty and the expiry date.


4.6 Standards for Documents

The Contractor will provide documents (such as emails, faxes, letters, reports, submissions, claims, etc) in a timely manner in accordance with the following:

4.6.1 Efficiency of Communication As a required courtesy to the Employer, the Contractor will provide documents that are clear, concise and facilitate easy reading by the Employer.

By taking extra time to properly prepare documents, the Contractor saves time downstream for the many people that have to handle and read such documents. This expedites the processing of the documents and responses if required.

4.6.2 Complete but Concise All the information required must be contained in a single submission. That is, all submissions must be "Complete". Piecemeal submissions are not appropriate.

However, it is not the responsibility of the Employer to sift through large submissions to find the required information. That is, all submissions should be "Concise". They should not contain extraneous (irrelevant) material. Eg. It is not acceptable to submit a catalogue of a range of materials when the requirement is only one product from that range.

4.6.3 Properly Structured for Easy Reference Large documents will be provided with a Table of Contents and assembled in an orderly manner. Summaries will be used to highlight critical information. Appendices will be used to supply supporting information separate from the body of the document.


4.6.4 Digital Documents Format

a) The preferred method of submission for digital documents is the Adobe Portable Document Format (PDF).

b) Where appropriate, word processing documents, spreadsheets and (Powerpoint) presentations may be submitted but must be compatible with the current Microsoft formats.

c) CAD Drawings will be compatible with the current AutoCad format. Layers will be named in an orderly manner. Entities will be created with consistent application of layers, line types and colours within the CAD Drawing.

If required by the Employer, the Contractor will supply supplementary information to aid in the interpretation of the CAD Drawing. Eg. Layer use, correlation table for colours and line thicknesses, block names, etc.

d) Documents will be kept to their smallest practical size.

e) Documents transmitted by email will be 5.0 Megabytes or less.

f) If required by the Employer, the Contractor will provide for the Employer (for both uploading and downloading) an FTP (File Transfer Protocol) site for documents larger than 5.0 Megabytes. Otherwise, these documents will be transferred using a compatible CD or DVD format.

4.6.5 Examples of Unacceptable Documents:

a) Digital documents that contain viruses, worms and other like code that potentially may be harmful to the receiver's computer or data.

b) A series of more than 5 image files as an attachment to an email. These images should be assembled into a PDF document for easy assess and handling by receivers of such information.

c) Documents that would be normally submitted as a single document (eg, a progress claim, or a material submission) will be submitted in a single PDF document rather than a series of documents.

Likewise, the Employer will reciprocate this in their communication to the Contractor.


4.7 The Contractor shall be deemed to have:

4.7.1 Examined all the information made available to him by the Employer including the Drawings, Specification, Bill of Quantities, Conditions of Tendering, reports, maps, diagrams, contract conditions and the like.

4.7.2 Examined all information relevant to the risks, contingencies and other circumstances which could affect his tender and which is obtainable by the making of reasonable inquiries.

4.7.3 Examined the site and its surroundings. This includes making their own assessment of any hard digging that may be required and including sufficient allowance for such in their bid.

4.7.4 Informed himself as far as practicable of the nature of the work and materials necessary for the execution of the work under the contract, the means of access to and facilities at the site and transport facilities for deliveries to the site.

4.7.5 Informed himself as to the availability of labour, conditions applicable to the employment of labour and the accommodation required.

4.7.6 Satisfied himself as to the correctness and sufficiency of his tender for the work under the contract and that the rates and prices stated therein cover the cost of performing all his obligations under the contract.

4.7.7 Allow for and pay import, sales or other applicable taxes, duties, charges and the like on materials, plant and equipment purchased for incorporation in the works unless the Employer has advised the Contractor otherwise in writing.

Failure by the Contractor to do all or any of the things he is deemed to have done under this clause will not relieve him of his liability to perform all his obligations under the contract.


5 IRRIGATION PUMP STATIONS The Contractor will supply, install and commission Irrigation Pump Stations as required by the Special Irrigation Specifications and Bill of Quantities. Each will comply with the following:

5.1 Location - As indicated on the irrigation drawings.

5.2 Performance Data

Refer to the Bill of Quantities for performance data.

5.3 Pump Column Length and Relative Levels (Depths)

Refer to the Special Irrigation Specifications and Bill of Quantities.

5.4 Main Pumps and Motors

5.4.1 All main pumps will be identical. 5.4.2 The main pumps will be vertical turbine pumps with 'steep'

performance curves (which allow easy pressure monitoring).

5.4.3 They will be fitted with non-reversing ratchets to prevent the motors driving the pumps in the wrong direction and causing damage.

5.4.4 The motors will be fitted with (space) heaters to prevent condensation inside the motors.

5.5 Jockey/Make Up Pump

The pump station will be fitted with a jockey/make up pump activated by pressure switches. This jockey pump is to provide limited manual watering and to maintain pressure within the mainline.

5.6 Pump House Structure

5.6.1 The pump house is by others.

5.6.2 Ventilation / Exhaust Fan(s) a) If the natural ventilation of the pump house is insufficient

to maintain a suitable room (ambient) temperature for the pump motors, then the Contractor will supply and install an exhaust (circulation) fan(s) as required.

b) The operation of the fan(s) will be synchronised with the operation of the main pumps. That is, they will only operate when 1 or more of the main pumps are operating.


5.7 Intake Line (From the Lake to the Wet Well) and Boxed Mesh Screen

5.7.1 The internal diameter of the Intake Line is specified in the Bill of Quantities with the pump station.

5.7.2 The Intake Line will be fitted with a Boxed Mesh Screen approved by the Employer to prevent the entry of solid, foreign particles into the line. The mesh size will be approximately 13 mm (0.5 inches). Refer to sketch for details of the screen and its mounting.

5.7.3 The Intake Line will be of either continuous Butt Welded PolyEthylene (PE) or Reinforced Concrete Pipe (RCP) construction but not Poly Vinyl Chloride (PVC).

5.7.4 The Intake Line will extend a minimum of 5 metres (16 feet) into the lake (measured from where the pipe breaks the embankment of the lake).

5.8 Wet Well

5.8.1 The pumps will be installed in the wet well structure with a concrete upper slab for the pumps to sit on.

5.8.2 The Contractor will be responsible for any piling deemed necessary. This will be assessed by the Employer and the Contractor will be advised of piling requirements dependant on ground conditions after excavation.

5.8.3 The Contractor is responsible for designing the wet well to suit the particular pump station being installed. It will be his responsibility to get approval from any necessary local statutory authorities. The drawings must have the stamp of a 'Professional Engineer'. Furthermore, the design, along with engineering calculations, must be submitted to the Employer for confirmation and approval prior to the commencement of construction.


5.9 Discharge Manifold The pump station discharge manifold assembly will include: 5.9.1 Valves

The manifold will be provided with the following valves: a) Check Valves

Cast iron body, stainless steel disc duo flap check valves on each pump unit.

b) Isolation Valves Cast iron body stainless steel disc insert type butterfly valves on: � each pump unit

� the discharge line to the field c) Air Valve

A 50 mm (2 inch) single acting air release valve complete with isolating gate valve located at the highest point in the discharge manifold.

d) Pressure Relief Valve

� A fast acting diaphragm type pressure relief valve with a fully adjustable brass pilot and control tubing with discharge pipework back to the wet well.

� The flow capacity of the pressure relief valve will be greater than the designed flow rate for the pump station.

� The pressure relief valve will be isolated from the manifold by a gate valve.

5.9.2 Threaded Bosses To accommodate: a) Fitting of pressure and flow sensing devices as per

electrical details for pump station

b) Fitting of flow measuring sensor for the fertigation system if applicable.

c) A 25 mm (1 inch) hose cock

5.9.3 Flexible Coupling A flexible coupling rated to the required system pressure will be fitted to between each pump unit and the manifold to: a) Dampen vibration

b) Provide flexibility at the joint for alignment movement. 5.9.4 Low Level Cut Off

Low level pump shut off probes to turn off all pumps in the event of low water level in the lake supplying those pumps.


5.10 Pump Station Operation The system will be controlled by a Programmable Logic Controller (PLC) monitoring a pressure transducer and operating the Variable Frequency Drive (VFD) as follows: 5.10.1 Design Pressure

The design pressure will be as previously stated for the pump station duty.

5.10.2 The system pressure will be monitored on the main discharge line from the pump station before any isolation valves.

5.10.3 The Jockey Pump

a) The jockey pump will operate to maintain design pressure and small demands on the system.

b) Initially when the system pressure drops below a set point, the jockey pump will start.

c) If after a pre-set time period the jockey cannot reach the design pressure, it will be cut out. The main pumps will then take over the task as per the 'Increasing Demand' section.

5.10.4 Increasing Demand a) The VFD (or lead) pump will ramp up. It will attempt to

increase the system pressure to the design pressure.

b) If the VFD can operate at an equilibrium point where it can maintain design pressure, it will.

c) If the design pressure cannot be reached within a pre-set time period, one main pump will start and the VFD pump will ramp down.

d) The above 3 steps will continue until all available main pumps are operating.

e) If all main pumps are running and the design pressure cannot be reached within a pre-set time period, then all pumps will shut down as a safety measure. This situation indicates either a major break or excessive system demand (too many sprinklers or quick coupling valves operating).


5.10.5 Reducing Demand

a) As the system pressure rises above the design pressure, the VFD pump will ramp down.

b) If the VFD can operate at an equilibrium point where it can maintain design pressure, it will.

c) If the design pressure remains high for a short pre-set time period, a main pump will be cut out.

d) The 2 steps above will continue until all main pumps are cut out.

Should the system (actual) pressure rise more than 15 metres (20 PSI) above the design pressure, all pumps will shut down as a safety measure.

5.10.6 Fluctuating Demand This will be handled by the system attempting to reach an equilibrium between the foregoing 'Increasing Demand' and 'Reducing Demand'. Since the system would be fluctuating, it will not reach a stable equilibrium point but the VFD will be hunting for that point while maintaining the correct design pressure.

5.10.7 Pump Duty Rotation The system will rotate the lead pump so that all pumps achieve an equal duty.

5.10.8 Limp Mode In the event of failure of the VFD or PLC or both, the pump station must be able to be operated manually.

5.11 Electrical Requirements

The following will be provided: 5.11.1 An IP55 (NEMA 4) rated electrical cabinet with suitably

screened ventilation.

5.11.2 A PLC to control pump operation. The PLC must communicate with all pumps to ensure correct pump operation.

5.11.3 A Variable Frequency Drive (VFD).

5.11.4 A DOL starter for the jockey pump. 5.11.5 A quick tripping air circuit breaker to protect each pump motor.

5.11.6 Fuses and main switches as required by regulation. 5.11.7 An earth connection dedicated to the pump station at the pump

station site.


5.11.8 Fault protection for each unit. This will include indicator lights, reset switches and reporting to the PLC of the following faults:

a) Phase Failure

b) Voltage Fault c) Low flow

5.11.9 A meter connected from the irrigation mainline to measure and display the flow rate and total flow from the pump station in SI (metric) units.

5.11.10 Pressure sensor and transducer to be connected from irrigation mainline to PLC for control.

5.11.11 All equipment required by the relevant Electricity Authority with jurisdiction over the project including but not limited to metering, switching, fusing and earth connections.

5.11.12 In the event of failure of either the PLC or VFD or both, the pumps must be capable of being manually operated for emergency use.

5.12 Wiring

5.12.1 The Employer will provide a power distribution box in the pump house for connection of the pump station

5.12.2 All wiring running into and out of the electrical cabinets will either:

a) pass through sweeping long radius conduit bends cast into the concrete cubicle base at the time of pouring of the pump station slab

or b) pass overhead in securely mounted cable trays with a

minimum clearance of 2.2 m (7 feet) above the floor.

5.12.3 All wiring runs will be anchored and reticulated using suitable cable trays and conduit to prevent damage and will be finished in a neat and tidy manner.

5.12.4 No cables will be run across the floor. 5.12.5 A person qualified will carry out all electrical work.

5.12.6 All work must comply with the requirements of the relevant Electricity Authority whose rules and requirements overrule these specifications if a conflict occurs.


5.13 Filter

The pump station will be fitted with a filter on the discharge line as follows:

5.13.1 Filter Performance - Refer to Bill of Quantities. 5.13.2 Each filter will have its backwash valves connected via

polyethylene lines to a backwash pit or if back into the irrigation lake, a minimum 50 m (164 feet) from the intake point for the pump station.

5.14 The Contractor is to provide full details on the construction and operation of the system (including the filter) he intends to install for approval by the Employer for purchase. These details will include both mechanical and electrical specifications together with warranty details.

6 FERTIGATION SYSTEMS The Contractor will supply, install and commission Fertigation Systems as required by the Special Irrigation Specifications and Bill of Quantities. Each will comply with the following:

6.1 Injector Performance - Refer to Bill of Quantities.

6.2 Number of Storage Tanks - Refer to Bill of Quantities

6.3 One Fertigation System will be installed with each Irrigation Pump Station.

6.4 The injection point will be after the filter.

6.5 All components (including pump) will be non-corrosive for the solutions to be injected. All hose clamps will be stainless steel.

6.6 Tanks

6.6.1 Tanks will be supplied as follows: a) One Mixing Tank

The mixing tank will be fitted with

� An agitator consisting of an impeller driven by an electric motor to mix the solution.

� A pump to circulate the solution from the bottom to the top of the tank to promote mixing and (by opening and closing of valves) be able to transfer the solution to any of the storage tanks.

� The intake of the mixing/transfer pump will be screened (at least 5,000 mm2 or 8 inches2). The screen will be able to be backflushed with pressurised water from either the mixing/transfer pump or the irrigation system.

b) Storage Tank(s) For storage of the solutions after mixing. Refer to Bill of Quantities for the quantity.


6.6.2 Each tank will be the same size; approximately 1.5 m (5 feet) in diameter, and 1 m (3 feet) high of fibreglass or High Density Polyethylene (HDPE) construction (volume of 1,750 litres or 450 US Gallons).

6.6.3 A galvanised steel pipeline (with valves) from the irrigation discharge line will be fed to each tank.

6.6.4 Lids will be supplied to suit the tanks.

6.6.5 Isolation valves will be fitted to the pipes between the tanks and injector heads to allow the solution from any or all tanks to feed any or all injector heads.

6.6.6 For ease of handling, the tanks will not be raised more than 300 mm (12 inches) above floor level. Therefore there must be a positive intake mechanism for the injection unit. It is not to rely on gravity feed.

6.6.7 There will be level indicators on the sides of the tanks so that the level can be seen without opening the lids.

6.6.8 The tanks will be able to be drained to the nearest drain outside the pump station.

6.7 Piping and Valves

The Contractor will arrange the pipes and valves between the tanks and injector pump so that the feed from any tank (mixing or storage) may be directed independently to any of the injection pumps.

6.8 The Contractor is to provide full details and operating characteristics of the fertigation unit he intends to use on this system for approval by the Employer before purchase.


7 TRANSFER PUMP STATIONS The Contractor will supply, install and commission Transfer Pump Stations as required by the Special Irrigation Specifications and Bill of Quantities. Each will comply with the following:

7.1 Locations - As indicated on the irrigation drawings.

7.2 Performance - Refer to Bill of Quantities

7.3 Pump Column Length and Relative Levels (Depths)

Refer to the Special Irrigation Specifications.

7.4 Intake Line (From the Lake to the Wet Well) and Boxed Mesh Screen

7.4.1 The internal diameter of the Intake Line is specified in the Bill of Quantities with the pump station.

7.4.2 The Intake Line will be fitted with a Boxed Mesh Screen approved by the Employer to prevent the entry of solid, foreign particles into the line. The mesh size will be approximately 13 mm (0.5 inches). Refer to sketch for details of the screen and its mounting.

7.4.3 The Inlet Line will be of either continuous Butt Welded PolyEthylene (PE) or Reinforced Concrete Pipe (RCP) construction but not Poly Vinyl Chloride (PVC).

7.4.4 The Intake Line will extend a minimum of 5 metres (16 feet) into the lake (measured from where the pipe breaks the embankment of the lake).

7.5 Wet Well

7.5.1 The pumps will be installed in the wet well structure with a concrete upper slab for the pumps to sit on.

7.5.2 The Contractor will be responsible for any piling deemed necessary. This will be assessed by the Employer and the Contractor will be advised of piling requirements dependant on ground conditions after excavation.

7.5.3 The Contractor is responsible for designing the wet well to suit the particular pump station being installed. It will be his responsibility to get approval from any necessary local statutory authorities. The drawings must have the stamp of a 'Professional Engineer'. Furthermore, the design, along with engineering calculations, must be submitted to the Employer for confirmation and approval prior to the commencement of construction.


7.6 The manifold will have:

7.6.1 Cast iron body, stainless steel disc duo flap check valves on each pump unit.

7.6.2 Flanged galvanised steel spacers between valves.

7.6.3 Cast iron body stainless steel disc insert type butterfly valves on each pump unit.

7.6.4 A flexible coupling rated to the required system pressure, to dampen vibration between the pumps and the manifold.

7.6.5 1 piece 50 mm (2 inch) single acting air release valve complete with isolating gate valve located at the highest point in the discharge manifold.

7.6.6 1 piece 50 mm (2 inch) fast acting diaphragm type pressure relief valve with a fully adjustable brass pilot and control tubing with pipework back to the lake or wet well.

7.6.7 Cast iron body stainless steel disc insert type butterfly valve on the discharge line to the field.

7.6.8 Low level pump shut off probes to turn off all pumps in the event of low water level in the source supplying those pumps.

7.7 Operation

The pump station will be operated by: 7.7.1 A 3 position switch for each pump unit:

a) On b) Off

c) Timer 7.7.2 Timer operation will provide 1 start and stop time each day

(easily adjustable by the operator).



7.8.1 Power Source

The Employer will provide power up to the pump. The provision of an electrical cabinet and board will be the responsibility of the Contractor.

7.8.2 Pump Motors

a) Protection Rating The motors will have a protection rating of IP55 (NEMA 4) for operation in the open (exposed to weather).

b) Starting of Motors

� A 'soft start' will be provided to limit start up current to twice that of full load current.

� This may be accomplished by using a separate soft start for each unit or automatically rotating the soft start between motors as required.

� The electrical design will be such that 2 motors do not start simultaneously so that the peak electrical draw is minimised.

7.8.3 Electrical Cabinet & Fittings a) The Electrical Cabinet will be installed above the flood

level.

b) The cabinet will have a protection rating of IP55 (NEMA 4) with screened (for insects and vermin) ventilation.

c) The cabinet will be lockable. The Contractor will provide 2 sets of keys to the Employer.

d) It will be fitted with the following:

� A quick tripping air circuit breaker to protect the pump motor.

� Fuses and main switches as required by regulation.

� An earth connection dedicated to the pump station at the pump station site.

� A flashing light will be mounted atop the pump station to draw the attention of maintenance staff in the event of pump failure.

� All equipment required by the relevant Electricity Authority with jurisdiction over the project including but not limited to metering, switching, fusing and earth connections.


7.8.4 Wiring

a) All wiring running into and out of the electrical cabinets will pass through sweeping long radius conduit bends cast into the concrete cubicle base at the time of pouring of the slab.

b) All wiring runs will be anchored and reticulated using suitable conduits to prevent damage and will be finished in a neat and tidy manner.

c) A qualified person will carry out all electrical work.

d) All work must comply with the requirements of the relevant Electricity Authority whose rules and requirements overrule these specifications if a conflict occurs.

7.9 Transfer Pipeline

7.9.1 Type of Pipe - Refer to Bill of Quantities 7.9.2 Installation - As per Irrigation Mainline

7.9.3 Air valves (as per irrigation mainline) are to be fitted at local high points.

7.10 Enclosure It is intended that the pump station will operate in the open. The Contractor is responsible for the building of a 2 m (6 foot) high wire mesh fence with barbed wire protection and a lockable gate. This must be sturdy enough to deter unauthorised access.

7.11 The Contractor is to supply full specifications on the construction and operation of the system he intends to install. These details will include both mechanical and electrical specifications together with warranty details and full description of system operation.


8 BOOSTER PUMP STATIONS The Contractor will supply, install and commission Booster Pump Stations as required by the Special Irrigation Specifications and Bill of Quantities. Each will comply with the following:


8.2 Performance Summary - Refer to Bill of Quantities

8.3 Schematic Layout - Refer to Sketch No 421-A4 enclosed.

8.4 Bypass Line

8.4.1 The Contractor will install a bypass line. In the event of failure of the Booster Pump Station, it may be bypassed to allow water to flow downstream (at a reduced pressure).

8.4.2 The bypass line and all fittings will be of the same diameter as the uPVC pipeline leading to the booster pumps.

8.4.3 It will have a mainline isolation valve that will be normally closed.

8.4.4 A check valve will be installed upstream of the isolation valve to prevent the backflow of water from higher elevations creating a high static head on the lower pressure hydraulic zone.

8.5 Pressure Gauges

A pressure gauge will be installed upstream of the booster pump and also downstream to enable checking of system pressures.


8.6 Pump Station Operation

The system will controlled by high and low pressure switches as follows:

8.6.1 Design Pressure a) The design pressure will be the downstream pressure as

stated in the Bill of Quantities.

b) The system pressure will be monitored on the discharge line from the pump station before any isolation valves.

8.6.2 Operating Cycle

a) If the pressure drops below the lower set point, then, after a preset time period, the pump will switch on.

b) If after a preset time the pump fails to increase pressure above this set point, it will switch off and remain off until manually reset.

� This situation indicates either a major break or excessive system demand (too many sprinklers or quick coupling valves operating) or an unprimed system.

� This protection mechanism will have to be manually over-ridden when initially priming the system.

c) When the pump reaches the upper set point, it will switch off.

d) This cycle will continue indefinitely.


8.7.1 Power Source The Employer will provide power up to the pump. The provision of an electrical cabinet and board will be the responsibility of the Contractor.

8.7.2 Pump Motors a) Protection Rating

The motors will have a protection rating of IP55 (NEMA 4) for operation in the open (exposed to weather).

b) Starting of Motors

� A 'soft start' will be provided to limit start up current to twice that of full load current.

� This may be accomplished by using a separate soft start for each unit or automatically rotating the soft start between motors as required.

� The electrical design will be such that 2 motors do not start simultaneously so that the peak electrical draw is minimised.


8.7.3 Cabinet & Fittings

The pump station will have an IP55 (NEMA 4) rated cabinet with suitably screened ventilation provided with the following:

a) A quick tripping air circuit breaker to protect the pump motor.

b) Fuses and main switches as required by regulation. c) An earth connection dedicated to the pump station at the

pump station site.

d) A flashing light will be mounted atop the pump station to draw the attention of maintenance staff in the event of pump failure.

e) All equipment required by the relevant Electricity Authority with jurisdiction over the project including but not limited to metering, switching, fusing and earth connections.

8.7.4 Wiring a) All wiring running into and out of the electrical cabinets

will pass through sweeping long radius conduit bends cast into the concrete cubicle base at the time of pouring of the slab.

b) All wiring runs will be anchored and reticulated using suitable conduits to prevent damage and will be finished in a neat and tidy manner.

c) A qualified person will carry out all electrical work. d) All work must comply with the requirements of the

relevant Electricity Authority whose rules and requirements overrule these specifications if a conflict occurs.

8.8 The Contractor is to provide full details on the construction, operation and warranty of the system he intends to install for approval by the Employer. These details will include both mechanical and electrical specifications together with warranty details and full description of system operation.


9 PRESSURE-REDUCING VALVES The Contractor will supply and install and Pressure-Reducing Valves as required by the Special Irrigation Specifications and Bill of Quantities. Each will comply with the following:


9.2 Performance Summary - Refer to Bill of Quantities

9.3 Pressure settings on all valves must be adjustable on site.

9.4 A pressure gauge will be installed upstream of the pressure reducing valve and another downstream to enable checking of system pressures. They must be easily readable.

9.5 The pressure-reducing valve must regulate downstream pressure as specified from low flow to the nominated maximum flow rate.

9.6 The pressure-reducing valve must have a positive cut off at low flow to prevent pressure buildup in the lower levels.

9.7 The valves will be Dorot or an Employer approved equivalent.

10 STAKING OF IRRIGATION SYSTEM COMPONENTS

10.1 The staking of the pump station pad, mainline, valve, sprinkler, quick coupling valve and satellite locations will be done by the Contractor subject to approval by the Employer.

10.2 The Contractor will supply the stakes as follows:

10.2.1 Each will be 1 m (3 foot) long. 10.2.2 The top of the stake will be flagged to make it distinctly visible

from a distance of 200 m (660 feet) to prevent damage from machinery.

10.2.3 Different flags will be used for Sprinklers, Quick Coupling Valves, Satellites and Mainline.

10.2.4 The Contractor will maintain the stakes until the area is turfed.


10.3 Sprinkler Staking Guidelines

10.3.1 Sprinkler Overthrow

This is defined as water coming directly from the stream of water being emitted from the sprinkler but does not include Sprinkler Wind Drift (see below).

Regardless of what is shown on the drawings, sprinklers will never be permitted to overthrow:

a) Property not owned or controlled by the golf course (especially public property). This is of particular concern for roads and paths.

b) Buildings. 10.3.2 Sprinkler Wind Drift

This is defined as the finer droplets of water that are carried by the wind more than 2 m (6 ft) beyond the sprinkler's radius of throw (as nominated by the sprinkler manufacturer's tables).

Where effluent water is being used, sprinkler wind drift must be controlled to the same extent as Sprinkler Overthrow (see above). Otherwise, control of Sprinkler Wind Drift is not a requirement of this specification. However, depending on local regulations (which as per the preamble would over-ride this specification), Sprinkler Wind Drift may or may not be allowed.

10.3.3 Irrigation Drawings are Indicative of the Irrigated Area

The sprinkler coverage shown on the plans is indicative of the area to be irrigated (as at the time of the design).

As typical during construction, there are changes to the layout of the golf course and even the extent of irrigation coverage. Greens tend to "grow larger" in construction and may require larger throw sprinklers to ensure "head to head" coverage over the greens. The sprinkler staking needs to be changed to accommodate these changes.

In any case, the sprinkler staking needs to be approved by the Employer before installation can proceed. This is most important to ensure that the sprinkler staking meets the needs of the Employer and for accountability of cost variations should extra sprinklers be required.


10.3.4 Staking According to Plan

a) If the layout of the golf course is the same as shown on the drawing, then the irrigation system should be staked similar to the "As-Designed" drawings.

b) When the layout of the golf course is different to the drawing, then the layout of the irrigation system needs to be adjusted accordingly (see below).

c) The overall number of sprinklers of each type should be the same. Sprinklers may be deleted from one hole and added to another without cost variation during staking. However, the overall number of sprinklers needs to be tracked and, if in excess of the design quantity, a variation order will need to be obtained before installation.

10.3.5 The Triangular Grid As shown on our plans, the sprinklers are arranged in a strict triangular grid.

a) The spacing of each sprinkler type is shown on the drawings. The sprinklers may be spaced closer than the nominated spacing but should never be "stretched". When 2 sprinklers of different throws interface (typically between greens and fairways), the spacing of the smaller-throw sprinkler is used.

b) Disruptions to the triangular grid may occur at � "Turning points in the sprinkler grid" (not to be

confused with turning points in the golf line of play) � Obstacles (primarily bunkers, water bodies, trees and

buildings) � The outer edges of the irrigated area. Good sprinkler staking will minimise such disruptions.

c) Depending on the particular site, there may be breaks in the triangular grid in areas not considered important for irrigation. Eg. The carry over area (the area between the tees and the beginning of the fairway), the rough between golf holes or from the area from the green to the next tee. The Employer will determine the importance of irrigation in these areas.

d) The objective is to achieve a good triangulated coverage of all in-play areas (tees, fairways and bunkers). With the exception of turning points in the sprinkler grid, the disruption of this pattern (if unavoidable) should be outside these in-play areas (typically in the rough).

e) This will provide the most uniform sprinkler coverage (high irrigation efficiency, no wet or dry spots) with the best resistance to wind to the most critical areas (the in-play areas).


10.3.6 How to Stake Sprinklers

a) Sprinkler staking involves selecting a starting point and a line of staking. From this base line, the triangular grid is generated.

b) The starting point is always at the green. This ensures a good interface between the green sprinklers and the fairway sprinklers.

c) The centreline of (golf) play is irrelevant for the staking of sprinklers. What is important is the area to be irrigated. Using the boundary of the irrigated area (often a buggy path, water edge or even the fairway itself in narrower systems), an edge is selected to give a direction.

d) The line of sprinklers can be turned (creating a "dogleg") to suit changes in the boundary of the irrigated area. The smaller the change in direction, the less disruption there is to the staking grid.

e) Having selected a starting point and direction, often we find that this does not layout well over the golf hole. If this is the case, we must re-start the staking from the beginning to find a better sprinkler grid. Do not be afraid to try different staking options. A day spent getting the sprinkler staking right will be repaid many times over by high sprinkler efficiency over the life of the system (20 years or so).

10.3.7 Tee and Green Sprinklers

Tee (or green) sprinklers should be (preferably) located at the top edge of the tee box (or green) or at the toe of the slope. This will result in the sprinkler being more horizontal resulting in better irrigation of the tee boxes (or greens). Locating sprinklers on the (particularly steep) slopes of the tee box sides (or green perimeter) should be avoided where practical. Refer to sketch enclosed.

10.3.8 Avoiding Trees

a) Full circle sprinklers should be a minimum 2 m (6 feet) from any tree trunk (as measured to the nearest section of the trunk).

b) Part circle sprinklers should be adjusted not to spray into tree trunks. Otherwise, they must be located as per full circle sprinklers (see above).


10.4 The Contractor will submit a sketch of the "As-Staked" plan to the Employer: The sketch will:

10.4.1 Show the proposed lateral and main line layout including sprinklers, quick coupling valves, isolation valves and satellites.

10.4.2 Provide a breakdown of quantities of "As Designed" and "As Staked" for all sprinkler types and quick coupling valves.

10.4.3 Indicate additional sprinklers and quick coupling valves. 10.4.4 Be signed and dated as approved by the Employer before

installation proceeds.

11 TRENCH WORK

11.1 Excavation

11.1.1 Trenches will be straight with the bed level and graded.

11.1.2 Mainline Excavation a) Trenching for mainlines will be performed by experienced

operators using an excavator or backhoe with bucket width at least 150 mm (6 inches) larger than the pipe diameter.

b) The material removed whilst digging will be placed at a safe distance from the top edge of the trench (to avoid collapsing the trench) and there will be a minimum of loose spoil left in the bottom of the trench prior to pipe laying.

11.1.3 Lateral Line Excavation

Trenching for lateral lines will be performed by either hand digging, a chain digger type machine or by backhoe with a maximum bucket width of 300 mm (12 inches), to minimise disturbance to the surrounding area.

11.1.4 Hard Digging or Rock Excavation The Contractor will include sufficient allowance in his bid for any hard digging or rock excavation required.

11.1.5 Mixing of Soil Layers When the depth of the trench extends through different soil structures (eg, sand capping, topsoil, clay, native earth), the Contractor will: a) Remove each layer and place it separately on the surface.

b) Refill the trench to restore the original layers of soil. Mixing of the different soil layers is not permitted.


11.2 Backfilling

11.2.1 Unsuitable Bedding Material

Unsuitable bedding material is defined as hardened clay, shale, rock, stones, building material (hardcore), tree roots or similar.

11.2.2 Sand Bedding Where trenches encounter unsuitable bedding material a 100 mm (4 inch) bed of sand or loam will be placed below the pipe in the trench prior to pipe laying.

11.2.3 Sand Cover Where the backfill material contains any unsuitable bedding material, the pipe will be covered with 100 mm (4 inches) of sand or loam to prevent such materials coming in contact with the pipe or control cables.

11.2.4 Backfill Material

Under no circumstances will material larger than 50 mm (2 inches) diameter be included in any backfill material. Material of this nature will be removed to a location on site specified by the Employer at the Contractor's expense.

11.2.5 Allowances should be made for backfilling during the heat of the day to minimise the effects of thermal expansion and contraction on pipe already laid.

11.2.6 Trenches will be backfilled on the same day as they are excavated. ie. Trenches will not be excavated until required. This is to prevent flooding/erosion of trenches and floatation of pipes.

11.3 Compaction

11.3.1 Compaction should take place only after suitable bedding and backfilling has been completed to the satisfaction of the Employer. Compaction is to be a minimum 90% Dry Density compaction but an average of 95%. Moisture content is to be a maximum of 30%.

11.3.2 Compaction can be achieved by either: a) Plate compaction in layers not exceeding 300 mm

(12 inches). The plate is not to be wider than the trench.

b) Wheel rolling with a suitable vehicle after 450 mm (18 inches) of cover is provided by plate compaction.

11.3.3 Reinstatement of Trench Subsidence

Regardless of which method is used, it will remain the Contractor's responsibility to ensure reinstatement of trench subsidence (including the re-establishment of the turf if applicable) during construction through to the end of the Defects Liability Period.


12 PIPE WORK

12.1 Storage

12.1.1 PVC pipe, when stored outdoors, will be covered with tarpaulins. Tarpaulins will be checked regularly to ensure that they do not collect water that could be used by mosquitoes for breeding.

12.1.2 For longer-term storage (more than 3 months), it must be stored indoors and away from direct sunlight.

12.2 Standards

12.2.1 Testing of uPVC Components Should it be required by the Employer, the contractor will allow the Employer to take samples at each shipment with uPVC pipes and fittings during the project for testing by the Employer as per the following: a) Acetone Test

� This test may be carried out on samples of pipe or fittings.

� The sample will be immersed in 99% anhydrous acetone for 15 minutes.

� The sample will then be removed and examined.

� Flaking or delaminating on the inner or outer walls will constitute failure.

� Softening or swelling does not constitute failure. b) Flattening Test

� A 50 mm (2 inch) sample will be taken from both ends of the pipe.

� A press will be used to flatten it across the diameter to 60% of its original diameter.

� The samples will then be examined.

� Cracking, splitting or breaking will constitute failure.

Failure of a test sample will result in rejection of the entire shipment. Alternatively further testing at the cost of the Contractor may be carried out to resolve which particular fittings are affected.

12.2.2 The laying, jointing, thrust blocking and testing will all be performed to the pipe manufacturer's recommendations. Should there be any conflict with this specification, the Contractor will notify the Employer before installation. The Employer will resolve the conflict as they see fit.


12.3 Laying of Pipe Work

12.3.1 Routing

Pipes will be laid in the routes and sizes as indicated on the drawings and stated in the relevant sections of this specification. In the case where multiple pipes or electrical conduits are laid in the same trench, they must be located side by side, not crossing each other or stacked one upon the other.

12.3.2 Visual Inspection before Installation

All pipes and fittings will be visually inspected for defects before installing. This inspection should include (but not be limited to the following):

a) Pipe Manufacturing Defects such as:

� Inclusions which are indicative of the use of non-virgin resin (or re-ground PVC).

� Bubbles or indents (particularly along the length of the pipe) that are indicative of resin feeding problems during the extrusion process.

� Sharp corners in the forming of the bell end (indicative of damaged or misaligned forming rollers).

b) Handling Damage such as:

� Scores (deep continuous scratches along the length of the pipe), likely to be created by dragging of the pipe over sharp edges such as rocks.

� Cracks (that may have been caused from dropping of the pipe).


12.3.3 Rubber Ring Jointed Pipe

a) All mainline pipe will be Rubber Ring Jointed. Solvent weld joints will not be permitted on the mainline.

b) All laying and jointing will be performed in situ in the trench on the prepared bedding. It will not be assembled above ground and placed in the trench at a later stage.

c) A cut Rubber Ring Jointed PVC pipe will have an external bevel similar to that produced by the manufacturer. An indelible witness mark will be drawn on the cut end of the pipe in accordance with the original witness mark.

d) The Contractor will leave the witness mark visible as evidence that the pipe has not been pushed too far into the bell end. This can put too much stress on the weakest part of the pipe as well as reducing the flexibility (articulation) of the joint.

e) The Contractor should be aware that witness mark depths are likely to vary between pipe manufacturers and the cast/ductile iron fittings.

12.3.4 Solvent Weld Jointed Pipe

a) Pipe ends should be cut square and shavings removed. b) All joints will be primed and left to cure for one hour

undisturbed after solvent welding and a further 23 hours prior to pressurising.

12.3.5 At the end of each day's work, all open ends of pipe work and conduit will be plugged and staked to prevent entry of vermin, dirt, water or moisture and movement of the pipe.

12.3.6 Where mainline pipe (not applicable to lateral pipe) is installed on a slope greater that 1:2 (vertical:horizontal ratio), sandbags will be installed above and below the pipe at the centre of each length of pipe, typically every 6 m(20 feet). This is to prevent the erosion of the bedding and backfill.

12.3.7 Where irrigation pipe crosses: a) Drainage Pipe

The Contractor is to ensure a minimum clearance of 100 mm (4") between the irrigation pipe and the drainage pipe. Preferably the irrigation pipe should pass under the drainage pipe.

b) Potable Water Pipes The Contractor is to ensure a minimum clearance of 100 mm (4") between the irrigation pipe and the potable water pipe. The irrigation pipe must pass under the potable water pipe.


12.4 Pipe and Cable Crossings

12.4.1 Electrical Cables (For Road and Bridge crossings only)

a) High Voltage Cables

� A separate PVC electrical conduit will be installed for the high voltage cables.

� The high voltage cables must have a separate conduit to the communication or low voltage cables. This is to prevent inductance from the high voltage cables affecting communication or low voltage signals.

b) Communication and Low Voltage Cables

� Communication and low voltage cables may share the same conduit.

� This conduit must be a minimum 300 mm (12 inches) from the high voltage conduit (if any).

c) Conduit

� The size of the conduit will allow easy pulling through of cables. In any case, the minimum size conduit used will be 50 mm (2 inches).

� If the conduit is exposed to sunlight, it will be Ultra Violet resistant.

12.4.2 Road Crossing a) Pressure Pipe

Where the pipe work goes under a road, the Contractor will supply and install (complete with any transition fittings) one of the following:

� Un-sleeved High Density PolyEthylene (HDPE) PN 16 butt welded pipe of equal or larger internaldiameter. This is the preferred method.

� Mainline to be sleeved with Class D (or Class 200) PVC pipe (sized to suit the mainline bell end).

� Un-sleeved cement lined ductile iron pipe of equal or larger internal diameter.

b) Depth The minimum depth of the sleeve, conduits or pipes will be 1,000 mm (40 inches) measured to the top of the sleeve.

c) Ends of Sleeve and Conduits These will be clearly marked above ground for ease of future location.


12.4.3 Bridge Crossings

a) These are where the mainline is shown crossing a waterway with a bridge.

b) Where the mainline pipe crosses bridges, the Contractor will use schedule 40 hot dipped galvanised pipe (of equal or larger internal diameter to the mainline) with flanges.

c) No PVC pipe will be exposed above the ground.

d) Where practical, pipes and conduits will be out of sight. 12.4.4 Buggy Path & Internal Maintenance Road Crossings

The top of the pipe and conduits will be a minimum 100 mm (4 inches) below the base of the buggy path. If it is less than this minimum, then the Contractor will: a) Pressure pipe

Install a Class D (Class 200) uPVC pipe sleeve of sufficient diameter to allow easy installation of the bell-ended PVC pipe.

b) Electrical

Provide conduits for electrical cables as stated above.


13 THRUST RESTRAINT SYSTEM FOR MAINLINE Thrust must be restrained on all mainline fittings that are subject to unbalanced thrust forces created by pressure and fluid movement. That is, at all mainline bends, tees, reductions, expansions, caps, isolation valves, etc but not for Solvent Weld Jointed pipe used for lateral lines.

13.1 Thrust Blocks

13.1.1 They will be installed in accordance to the pipe manufacturer's requirements, which will over-ride the requirements of these specifications if there is a conflict.

13.1.2 Excavation of the thrust bearing surfaces will be at right angles to the line of thrust and located in either solid, undisturbed soil or soil which has been compacted specifically for that purpose (refer to sketch).

13.1.3 The thrust blocks must have cured for: a) 24 hours before pressurising the line.

b) 72 hours before pressure testing.

13.2 Joint Restraint System

As an alternative to thrust blocks, the Contractor may use a joint restraint system.

13.2.1 The joint restraint system will be Leemco or an Employer approved equivalent.

13.2.2 The will be installed in accordance with the manufacturer's requirements.

13.2.3 It will be able to withstand twice the pressure rating of the pipe.

13.2.4 The bolts, nuts and washers used will be corrosion resistant 316 stainless steel.

13.2.5 Joint restraint clamps will of be ductile iron and of sufficient width that, when fully clamped, they will not damage the pipe (ie, create excessive stress on the pipe).

14 DRAINAGE (SCOUR) VALVES

14.1 They will be installed at all local low points along the mainline as located on site and approved by the Employer. As a minimum, one Drainage (Scour) Valve will be installed on each hole and the driving range.

14.2 They will drain to the nearest available drainage catch basin or water body.

14.3 Refer to sketch enclosed.


15 AIR VALVES

15.1 Air valves will be located:

15.1.1 On all bridge crossings.

15.1.2 At local high points along the mainline and at ends of mainline as located on site and approved by the Employer.

15.2 All air valves (on bridges or underground) will be able to be isolated from the mainline by a 50 mm (2 inch) gate valve.

15.3 Underground air valves will be installed so that they are a minimum 100 mm (4 inches) and a maximum 200 mm (8 inches) below grade (refer to sketch)

15.4 Air valves at bridge crossings will be installed on a 50 mm boss (2") boss on the pipe (refer to sketch).

15.5 All air valves will be fitted with a brass 'blow off' elbow.

16 ISOLATION VALVES

16.1 Mainline Isolation Valves

16.1.1 Mainline isolation points will be achieved by installing gate valves at designated locations indicated on the drawings. These valves will be housed in valve boxes and supported by a galvanised steel bracket mounted in a concrete thrust block (refer to sketch).

16.1.2 The valve handle will be removed and replace with a 50 mm (2 inch) drive nut. Where practical, the drive nut will be located within 150 mm (6 inches) of the top of the valve box for ease of operation.

16.2 Lateral Isolation Valves (including Greens)

16.2.1 All laterals (including greens sub-mains) will be isolated by installing a screwed bronze gate valve at the point of take off from the mainline.

16.2.2 The valve handle will be located within a minimum 100 mm (4 inches) to a maximum 200 mm (8 inches) of the top of the valve box to enable ease of operation. This will be accomplished by adjusting the length of the vertical riser (TOE nipple) from the tapping saddle to the elbow to suit on site conditions.

16.3 They will be housed in valve boxes (refer to sketch).


17 QUICK COUPLING VALVES (QCVs)

17.1 Where tapped from the mainline, an isolating gate valve will be fitted at the point of tapping (refer to sketch) for the QCV line.

17.2 Each QCV will be securely attached to a solid stake to prevent rotation (refer to sketch).

17.3 Where practical, QCVs will be located within 0.5 metres (18 inches) of a sprinkler to aid location by ground staff.

17.4 QCVs for the greens will not use valve boxes (refer to sketch).

18 REMOTE CONTROL VALVES (RCVs)

18.1 The RCV will be installed downstream of the lateral isolation gate valve.

18.2 All RCV assemblies will be housed in valve boxes with valve chambers to permit access (refer to sketch).

19 VALVE BOXES

19.1 All valve boxes will be of green reinforced fibreglass of similar construction to the Carson series of valve boxes (or an Employer approved equivalent) fitted with bolted down lids.

19.2 Where practical, valve boxes will be located away from drainage swails and depressions.

19.3 All valve pits will be constructed of bricks.

19.4 There will be no contact between the pipe and the valve box or valve pit.

19.5 All valve pits will have a minimum fill of 100 mm (4 inches) of washed pea gravel or blue metal.

19.6 Valves boxes will be set parallel and level with the final grade. It is within a non-turfed area (eg, garden bed, love grass), it will be left 75 to 100 mm (3 to 4 inches) above final grade so that it remains easy to find.


20 SPRINKLERS

20.1 Sprinkler Performance - See Bill of Quantities

20.2 Each sprinkler will be side connected to the lateral pipe work via a swing joint riser as nominated in the Bill of Quantities.

20.3 The thread of the riser must match the thread in the base of the sprinkler.

20.4 Each sprinkler will be initially installed with the top parallel to the grade but 75 mm (3 inches) to 100 mm (4 inches) above the grade. After the establishment of the turf, the Contractor will reset the sprinkler level with the grade. If a golf sprinkler is within a non-turfed area (eg, garden bed, love grass), it will be left above grade so that it remains easy to find.

20.5 Each sprinkler will be enveloped in a compacted sand bed and sand surround to enable easier resetting of the sprinkler height. The sand surround will be 400 mm (16 inches) diameter. The sand will be compacted to prevent subsidence. Refer to sketch.

21 IRRIGATION CONTROL SYSTEM

21.1 Overview

The system will be controlled by a Computerised Central Controller with power conditioners, power cables, communication cables, satellites and earth connections.

21.2 Manufacturer's Specifications

21.2.1 The Irrigation Control System will be installed in accordance with the Manufacturer's specifications and requirements.

21.2.2 If there is a conflict between these specifications and the Manufacturer's, then the Manufacturer's specifications will apply.

21.2.3 If the requirements of these specifications are more stringent than the Manufacturer's, then these specifications will apply.

21.2.4 This is not only for the reason of correct operation of the system but also from the viewpoint of obtaining back-up from the Manufacturer for service and warranty claims should the need arise.


21.3 Irrigation Control System Power Sources

21.3.1 Locations The Employer will make power available for connection and operation of: a) The central controller at the maintenance centre. b) The satellites at the Irrigation Pump Station.

21.3.2 Satellites a) Transformers

If necessary, the Contractor will supply and install a suitable transformer from the local supply voltage to 220/240 V to suit the satellites.

b) Power Conditioners The Contractor will supply and install a separate power conditioner at each power source for satellite field circuits. The power conditioner is to be as recommended by the manufacturer of the irrigation control system.

21.3.3 Central Controller The Contractor will supply an Uninterruptible Power Supply (UPS) for the central computer including the computer with monitor and field interface unit. The unit must be capable of maintaining power to these items for 1 hour in the event of power failure.

21.3.4 Weather Station (if installed) This will be tapped from the nearest available satellite. It is the Contractor's responsibility to make the connection.


21.4 Master Computer (Computerised Central Controller)

21.4.1 The minimum requirements for the computer will be:

The computer will meet the requirements of the manufacturer of the Irrigation Control System. At a minimum, it will comply with the following:

a) Purchase of Computer

� Rain Bird - As would be supplied in the domestic market in the United States of America except suited to local power supply (voltage and frequency).

� Toro - Supplied from Toro b) IBM Compatible as recommended by the Irrigation

Control System manufacturer. A substitute is notacceptable. The minimum requirement is a Pentium IV (2.4 GHz) processor or higher.

c) The latest Microsoft operating system that is compatible with the Irrigation Control System.

d) Minimum 512 Megabytes of RAM

e) Minimum 80 Gigabyte Hard Disk f) 17 inch LCD (Liquid Crystal Display) monitor

g) CD-RW Drive for backing up data. h) A Canon or Hewlett Packard colour bubblejet printer or

Employer approved equivalent.

If there is any conflict between these requirements and the manufacturer's, the manufacturer's requirements will apply. If these requirements exceed the manufacturer's requirements, these requirements will apply.

21.4.2 The Irrigation Control Software installed will be latest available at the date of purchase of the Irrigation Control System.


21.5 Weather Station

21.5.1 Location

The location of the weather station is at the moment undetermined. The Contractor is to allow a distance up to 500 m (1,640 feet) from the central controller (measured by the length of the cable route). The location should be recommended by the Contractor and approved by the Employer as follows:

a) Wind Disturbance

Trees, buildings and other structures create disturbance to the wind speed and direction. The station is to be installed outside of the "envelope" of disturbance, which is related to the height of the structure. This envelope extends:

� Twice the height of the structure

� Upwind by twice the height of the structure

� Downwind by six times the height of the structure. b) Temperature and Relative Humidity

� It should be located over the most typical turf to allow readings to correspond to that of the Turf. This makes the EvapoTranspiration value derived more accurate.

� It must not be located over concrete (or other hardscapes) or unplanted earth.

c) Solar Radiation The solar radiation shield should be exposed to direct sunlight. Surrounding objects should not shade it.

d) Lightning

To avoid damage by lightning, the station should not be located at the top of a knoll or mound. It should be lower than the surrounding hills if possible.

e) Sprinklers

Sprinklers and overspray from them should be far enough away so they do not affect the weather station's measurements.

21.5.2 Enclosure The Contractor is responsible for the building of a 2 m (6 foot) high wire mesh fence with barbed wire protection and a lockable gate. The enclosure will be 4 m (13 foot) square. This must be sturdy enough to deter unauthorised access.


21.6 Field Satellites

21.6.1 Earth Connection - Refer to Sketch

21.6.2 Mounting - Refer to sketch 21.6.3 Stationing

a) Number of solenoid valves per station:

� On Greens, 1 VIH sprinkler per station.

� Otherwise a maximum of 3 VIH sprinklers (each with similar run times) will be allowed per station.

� 1 Remote Control Valve per station b) A maximum of 2 VIH sprinklers feeding from the same

lateral valve will be attached to the same station.

c) Unless otherwise directed by the Employer, the station sequence will be similar to that shown on the drawings. That is, in the following order:

� Greens, starting at the front left sprinkler and going clockwise around the green.

� Tee boxes, starting at the back tee and working toward the green.

� Green Surrounds

� Fairways and roughs, starting from the green approach and working toward the tees.

21.6.4 Lightning Protection

a) The central controller will be fitted with the manufacturer's recommended lightning protection kit.

b) Satellites will be fitted with the maximum lightning protection available from the manufacturer.


c) Lightning Detection and Grounding System

The irrigation control system will be protected as follows:

� Lightning Detection The system will use either Storm Watch (Rain Bird), Strikeguard (Toro) or Employer approved equivalent to detect when the presence of lightning may cause damage to the system.

� Action Upon Detection of Lightning

The system will:

� Disconnect the communication cable from the central controller and satellites and connect them to ground.

� Disconnect the low voltage cables from the controllers and connect them to ground.

� Re-Connection After the lightning storm has passed to a safe distance, the system will return to normal operating/standby mode.

21.7 Communication Cable

21.7.1 Communication cable will be of a type approved by the manufacturer. It will be laid along the mainline trench as shown on the electrical drawing. Installation must comply exactly with the manufacturer's specifications.

21.7.2 A 1 m (3 foot) loop will be provided at all junctions.

21.7.3 The Contractor will install continuous runs of communication cable without any joints.

21.7.4 Joints will only be permitted when, after installation, the cables are damaged by another party.

a) Then the joints must be made with 3M brand DBY connectors,

b) The joints will be made in electrical joint boxes and marked on the As Built Drawings.

c) The Contractor is allowed to repair only 1 break (normally involving 2 joints) between each satellite. If there are more than 2 joints, the entire length of communication cable between the satellites will be replaced at the expense of the party causing the damage.


21.8 Protection for High Voltage Power Cables

21.8.1 Depth

The supply and installation of the power cables will comply with the relevant statutory authority. In any case, there will be a minimum ground cover of 600 mm (2 feet).

21.8.2 Warning or Protection

a) The Contractor will comply with local statutory requirements in regard to marking or protection of the cable. This may involve marking tape, cable warning slats, bricks located 300 mm (12 inches) above the cables, etc, as required to satisfy the local statutory requirements.

b) In any case, the minimum requirement will be to run a high voltage warning tape (in the language of the country if available as a standard supply item) 300 mm (12 inches) above the cables.

21.9 Low Voltage (Solenoid) Control Cables

The cables running from satellites to the valve in head sprinklers or remote control valves will comply with the following:

21.9.1 All cables will be tested physically and electrically before installation.

21.9.2 Common Cables

a) The colour white will be retained for use as the common cable.

b) This cable will be 2.5 sq mm (#12) cable and will be run (in common) to each VIH sprinkler or remote control valve.

21.9.3 Active Cables

a) A separate active cable will be run from the satellite to each VIH sprinkler and remote control valve. This is to:

� Facilitate the easy re-grouping of VIH sprinklers at the satellite.

� Avoid electrically overloading the active cable

� Provide ability to link additional sprinklers to existing active cables.

� In the event of an active cable failure, only 1 sprinkler is affected and it can be linked to another active cable as a repair measure.

b) The cables will run from the satellite to the mainline, along the mainline, exit the mainline trench at a mainline take off (lateral isolation valve) and then follow the lateral pipe.


c) Actives will be 1.5 sq mm (#14) cable and either colour coded (minimum of 4 colours) or permanently numbered (using cable number clips) to simplify identification.

d) There will be a spare 'active' cable (colour to be brown) installed. It will be run with each 'common' cable along the mainline. It will be terminated in the furthermost valve box on the mainline with a 1 m (3 feet) coil of cable.

e) To aid maintenance staff, no active cable will be the same colour as the common cable.

21.9.4 Running of Cables: a) Cables will run from the satellite to the nearest mainline

("dry run"), then along the mainline, then along the lateral lines (via the lateral isolation valve). Except for the dry run between the satellite and the mainline, the cables will always be laid with pipe (refer to sketch).

b) A 1 m (3 feet) loop of cable will be left at each solenoid to facilitate future valve maintenance.

c) Cables will be taped every 3 metres (10 feet) to keep them tidy.

21.9.5 Cable Joins a) All cables will be continuous runs and there will be no

random joins in the field.

b) Cable joins will only be accepted at VIH sprinklers, remote control valves, satellites and lateral isolation valves. There will be a separate join for the active and common cables.

c) The only acceptable method of joining cables will using 3M DBY (for 2 cables) and DBR (for 3 or 4 cables) connectors in accordance with manufacturer's instructions.


21.10 Installation of Cables

21.10.1 Cable Joints

Where cable joints in the field are unavoidable due to accidents, these joints will be housed in a valve box marked 'Electrical Joint' and their location must be noted on the 'as constructed' drawings.

21.10.2 Dry Runs Where there are dry runs (that is, not in the same trench as the irrigation pipe) of any cables (communication, high or low voltage), the Contractor will provide warning as specified elsewhere.

21.10.3 Power Cables other those for the Irrigation Control System

In reference to Power Cables other than those for the Irrigation Control System (eg, Power Cables for Lighting or Pump Stations)…

Regardless of whether or not these cables are or are not part of the same Contract, they:

a) Will not be buried in the same trench as the cables for the Irrigation Control System.

b) Will be kept a minimum 2 m from cables for the Irrigation Control System.

c) Should not cross cables for the Irrigation Control System. If this is unavoidable, then:

� They should be separated by a depth of 2 m if practical.

� The crossing must be at 90 degrees to minimise inductance in the cables for the Irrigation Control System.

� Such crossings must be noted on the irrigation "As-Built" drawings.

21.10.4 Licensed Electrical Personnel A licensed electrical person will perform all high voltage cabling and connections.

21.10.5 Statutory Authority

All cabling will be in accordance with the relevant statutory authority requirements, which will override these specifications if there is a conflict.


22 DOCUMENTATION

The following documentation is to be supplied by the Contractor and acceptance is subject to approval by the Employer.

22.1 As Constructed Drawings

22.1.1 Media a) The Contractor is to supply 1 set of scaled

'As Constructed' Hydraulic and Electrical drawings of similar quality to the construction drawings on plastic drawing film (mylar). Two copies on paper will also be supplied.

b) Two 'soft' copies of the drawings will be provided on separate CD-ROM disks in AutoCAD 2004 format.

c) These irrigation 'As Construct' drawings will be overlaid on the 'As Construct' drawing of the golf course layout.

d) The 'As Constructed' golf course layout will show outlines of tees, fairways, greens, bunkers, water bodies, waterways, bridges, buggy paths, maintenance roads, building outlines and the centreline of play without contour lines.

22.1.2 Survey Method - Accuracy

The Contractor with survey (traditional or using Global Positioning System) within a 1 m (3 feet) accuracy the following:

a) Pump Station

b) Sprinkler Heads c) All Types of Valves

d) Satellites e) Greens

f) Tee boxes


22.1.3 Hydraulic Drawings

These drawings scaled at 1:1000 will include the location of: a) Pump Station

b) All mainline and lateral piping (including sizes) c) Mainline fittings (tees, bends, reducers)

d) Sprinkler heads Note: In the legend, the Contractor is to state the following

information for the sprinklers: Manufacturer, Model, Nozzle, Operating Pressure and Spacing

e) All valves:

� main isolation

� air

� quick coupling

� lateral isolation

� Remote Control Valves

� green isolation f) Computerised Central Controller g) Satellite stationing numbers for VIH sprinklers and

Remote Control Valves

h) Satellites

i) Weather Station (if installed) j) Aerators (if installed)

22.1.4 Electrical Drawings These drawings (scaled to fit on one A0 sheet) will include the location of:

a) Pump station

b) Power Sources c) Computerised Central Controller

d) Satellites e) Weather Station (if installed)

f) Routing and sizing of all high voltage cables g) All communication cables including (but not limited to)

irrigation control system, weather station communication cable (if installed) and remote pump log cable (if installed).

h) All electrical joint boxes including showing the type (high voltage, low voltage or communication).


22.2 Manuals

22.2.1 Three sets of instruction manuals (1 unbound and 2 bound) on A4 size paper will be provided by the Contractor.

22.2.2 The Contractor will submit a draft copy for prior approval by the Employer.

22.2.3 These manuals are to be comprehensive and fully descriptive to enable the Employer to properly operate and maintain the system. They are to include a troubleshooting guide of the problems likely to occur during the lifetime of the system. They must cover:

a) The pump station operation, maintenance and troubleshooting guide.

b) The irrigation system operation, maintenance and troubleshooting guide.

c) Maintenance schedule of all irrigation system components. d) All relevant manufacturer's manuals on the pump station

and irrigation control system.

e) All irrigation components installed.

f) Trade literature g) Local suppliers details including:

� Name of Company

� Name of Contact Person

� Address

� Phone Number

� Fax Number h) Local technical support


23 TRAINING

During the last month of the contract, the Contractor will train two persons as nominated by the Employer for a period of 1 week. The training will familiarise the personnel with maintenance, operation and troubleshooting of all components of the irrigation system including but not limited to:

23.1 Pump Station

23.1.1 Maintenance 23.1.2 Greasing points

23.1.3 Pump gland adjustment and replacement 23.1.4 Starting up and closing down

23.1.5 Valves 23.1.6 Meters

23.1.7 Filter Operation a) Manual Flushing

b) Screen removal and re-fitting 23.1.8 Fertigation Unit Operation (if installed)

23.1.9 Trouble shooting

23.2 Irrigation Control System

23.2.1 Central Controller Programming and Operation

23.2.2 Weather Station Maintenance (if installed) 23.2.3 Satellite Operation

23.2.4 Maintenance 23.2.5 Trouble Shooting

23.2.6 Communication Cables 23.2.7 High Voltage Cables

23.2.8 Low Voltage Cables 23.2.9 Cable Joining Procedures

23.2.10 Lightning Protection 23.2.11 Fuses

23.3 Piping

23.3.1 Repairs to mainline 23.3.2 Thrust blocks or Joint Restraint System (as applicable)

23.3.3 Repairs to laterals


23.4 Valves

23.4.1 Opening/Closing

23.4.2 Isolation procedures

23.5 Sprinklers and Remote Control Valves

23.5.1 Operation

23.5.2 Dis-assembly 23.5.3 Cleaning

23.5.4 Assembly

23.6 Aerators (if installed)

23.6.1 Operation

23.6.2 Maintenance

23.7 Review of As-Constructed Drawings

24 SPARES

A range of maintenance tools and spares (as listed in the Bill of Quantities) is to be included as part of the contract. They will be delivered to the Employer before the issuing of the certificate of practical completion.

25 TESTING PROCEDURES

25.1 Adjustment of the System

The Contractor will adjust the various components of the irrigation system to ensure the overall operation of the system is efficient. This includes the programming of the irrigation control system, pump station and adjustment of part circle sprinkler heads.

25.2 Records of Test

25.2.1 All tests will be carried out by the Contractor and approved by the Employer.

25.2.2 All tests will be recorded by the Contractor and handed to the Employer with the Contractor retaining copies.


25.3 Static Pressure Test

25.3.1 A static test of two hours duration at 1.5 times the working pressure of the mainline (but no higher than the pressure rating of the pipe) will be performed at the completion of the tapping saddle installation stage of each section of the mainline.

25.3.2 All isolation valves and thrust blocks must be in place and cured for the mandatory period of time.

25.3.3 Air valves, quick coupling valves and lateral valve assemblies must be completed and the lines thoroughly flushed and primed prior to testing.

25.3.4 There will be no permissible leaks at any point in the system. 25.3.5 During the period of the static test, the pressure will not drop by

more than 25 kPa (3.5 PSI).

25.4 Cable Continuity

25.4.1 All communication and high voltage cables will be tested for continuity before installation with a continuity tester (Kyoritsu brand or Employer approved equivalent).

25.4.2 This test will be repeated after the cables have been installed in the ground but before backfilling.

25.4.3 The cables must not be connected to any other electrical equipment (for example, satellite, central controller) while they are being tested.

25.5 Satellite Earthing

All satellite earths will be tested with an earth resistance meter (Kyoritsu brand or Employer approved equivalent) to ensure conformance to specification.

25.6 Commissioning

25.6.1 The commissioning of the pump station will be carried out by the manufacturer's representative in conjunction with and approved by the Employer.

25.6.2 The commissioning of irrigation control system will also be carried out by the manufacturer's representative in conjunction with and approved by the Employer.

25.6.3 The commissioning will include, at the time of handover, a demonstration of all sections and individual elements pertaining to the operation of the irrigation system.


26 HANDOVER

26.1 Definition

Handover (yielding of control) of sections of the works may occur during the contract. Handover occurs when control and responsibility for the nominated works passes from the Contractor to the Employer. This is necessary to enable the Employer to use the works.

26.2 Responsibilities for Works Handed Over

26.2.1 The Contractor will still be liable for any defects until the end of the Defects Liability Period.

26.2.2 Works handed over to the Employer will be operated and maintained by the Employer.

26.3 Conditions for Handover

26.3.1 Before handover occurs: a) Any commissioning (eg, pump station, control system) or

testing (eg, pressure tests, electrical tests) has been completed.

b) The completed section must have been operated without fault for at least one week prior to handover.

c) Should any major mainline leaks occur prior to handover, the static pressure test procedure will be repeated once the problem has been rectified.

d) If the section is repaired, then it must operate for at least one more week without fault prior to handover being accepted.

26.3.2 In lieu of an official handover, any works properly tested, commissioned (if applicable) and used by the Employer for one week without fault will be deemed as handed over.

27 PRACTICAL COMPLETION

27.1 Practical completion will be granted when:

27.1.1 The system is complete and fully functional

27.1.2 The entire works has been handed over 27.1.3 Training satisfactorily completed

27.1.4 Documentation supplied and approved 27.1.5 Spares delivered

27.1.6 A satisfactory Final Inspection has been made and other contractual obligations fulfilled to the satisfaction of the Employer.


27.2 Final Inspection

In preparation for the final inspection for granting of practical completion, the Contractor should take the following actions:

27.2.1 Handover

The entire works will have been handed over to the Employer. 27.2.2 System Complete and Fully Functional

The system must be complete and fully functional. This includes (but is not limited to) attending to details such as:

a) Fitting of all air valves. b) All sprinklers and remote control valves (if applicable) on

all stations on all satellites operating correctly including adjustment of part circle sprinklers.

c) Sprinklers set to grade and not weeping. d) Valve boxes set to grade and properly finished.

e) Quick coupling valves properly secured. f) Programming of the Central Controller and Satellites.

27.2.3 Documentation A copy of all documentation (including As-Built drawings and Manual) will be submitted to the Employer at least 2 weeksbefore the Final Inspection.

27.2.4 Testing and Commissioning All testing and commissioning must have been completed with records submitted to the Employer.

27.2.5 Training

Must be satisfactorily completed. 27.2.6 Delivery of Spares

These must have been delivered and duly acknowledged by the Employer.

27.3 At the discretion of the Employer, practical completion may be granted subject to a 'defects list' of minor rectification work to be carried out by the Contractor.

27.4 If the minor rectification work is not carried out within 2 weeks of the granting of practical completion, then the date of practical completion will be extended until such time as they are completed.


28 DEFECTS LIABILITY PERIOD

28.1 After the issue of the certificate of practical completion, there will be a 12 month 'Defects Liability Period' (DLP).

28.2 The Employer may hold retention monies until the completion of the DLP.

28.3 During the DLP, the Contractor will be responsible for the repair of any defects that may arise with the system.

28.4 Should the Contractor fail to make good any defects, the Employer reserves the right to make good the defects and charge the Contractor for such works.

29 TYPICAL ASSEMBLY SKETCHES 614-A4 Intake Line: Screened Inlet - Over 149 L/s or 2,365 USGPM) 261-A4 Intake Line: Screened Inlet - Under 149 L/s or 2,365 USGPM) 262-A4 Intake Line: Support Details 422-A4 Pump Station Z-Leg: - Typical Assembly 601-A4 Pump Station Z-Leg - Hot Dipped Galvanised Tee Adaptor 452-A4 Filter Backwash Pipe - Outlet to Lake 263-A4 Trench Profile: Typical Cross-section 264-A4 Thrust Blocks 273-A4 Mainline Isolation Valve 612-A4 Typical Bridge Crossing 421-A4 Booster Pump: Typical Assembly 276-A4 Pressure Reducing Valve: Typical Assembly 607-A4 Mainline Tapping with Isolation Valve 266-A4 Air Valve: 50 mm (2") 269-A4 Lateral Take Off: Valve in Head or Manual Operation 270-A4 Lateral Take Off - Remote Control Valve 426-A4 Quick Coupling Valve: VIH Tapping 268-A4 Quick Coupling Valve: Greens Only 272-A4 Sprinkler Take Off 611-A4 Sprinklers on Embankments 450-A4 Satellite / Controller - Mounting of Pedestal 676-A4 Satellite / Controller - Earth Grid - Rain Bird - Toro