Mechanical Specifications for Villas

7/24/2019 Mechanical Specifications for Villas

1/30

INDEX MEP PAGE 1 OF 30

PART BMEP WORKS

Design and Construction of Dar Zayed Sons Villas

Volume 3

Part

B - MEP Specifications

DECEMBER 2015


2/30


PART BMEP WORKS

PART # 1

HVAC WORKS


3/30


PART BMEP WORKS

1.1 HVAC SYSTEM:

1.0: SPECIFICATION FOR VARIABLE REFRIGERANT FLOW SYSTEM.

1.1: GENERAL DESCRIPTION OF WORK SCOPE:-The Air Conditioning Contractor shall supply, deliver, install, set to work and commission the

systems and equipment as detailed in this section of the specification, as shown on the Tender

drawings and listed in the Schedule at the end of this section.

Mentioned capacities for all types of A/c units are the minimum required and the contractor should

submit the higher standard to Consultants approval.

The Contractor should upgrade duct size of outlet size if necessary according to selected equipment.

The Contractor shall be responsible for co-ordination of all services.

1.2: DESIGN CONDITIONS:-

Air conditioning with VRF system (Variable refrigerant flow)Without Fresh Air:

Cooling: - Indoor - 23/16 1 C DB/WB Outdoor 46 CDB

Heating: - Indoor - 21 C DB 1 C Outdoor - 7 CDB/ 6 CWB

Air conditioning with VRF system (Variable refrigerant flow)With Fresh Air:Cooling: - Indoor - 26/18 1 C DB/WB Outdoor 46 CDB

Heating: - Indoor - 21 C DB 1 C Outdoor - 7 CDB/ 6 CWB

Tolerance on temperature control 2 C at design conditions nominated:

Humidity Uncontrolled (except where indicated) and hence resultant humidity shall be a function of

set point temperature.

Ventilation Rate: The fresh air rates for airconditioned areas and extract ventilation shall comply

with ASHRAE standard 62-1989, and/or as shown on plans.

Air Distribution: Low velocity duct work to be sized on equal frication method at a rate of 0.05 Ft/

100 Ft of equivalent length not exceeding 275 to 310 meter per minute.

Sound Levels: 35 to 40 db (A)

Refrigerant: R-410 A

Power Supply: (V/PH/ HZ)

380-415/3/50220-240/1/50


4/30


PART BMEP WORKS

1.3: Compliance to ESTIDAMA guidelines:

RE-1 (Improved Energy Performance): The air conditioning unit (based on condenser

performance) to have a minimum seasonal average COP of 3.8. The performance is based uponcompliance with the air-conditioning, Heating and Refrigeration Institute (AHRI) test procedure

appropriate to the type of system installed.

RE-R3 (Ozone Impacts of Refrigerants & fire suppression systems): All refrigerants to be installedwithin the project site boundary should have an Ozone Depletion Potential (ODP) of zero (0).

All fans are to have a maximum fan power of 2.2W/l/s.RE-2: Cool Building Strategies: To determine the most effective solution to reducing a buildings

cooling demand by incorporating passive design strategies as a priority which can be obtained if

the following faade improvement are made:

Construction Element U-Value (W/mK)

Fenestration 1.9Roof 0.12

Wall 0.29

Basement Wall 0.26

Floor 0.14

Crawl Space Wall 0.32

Infiltration rates are to a maximum of 0.20ach.

1.4: FEATURES

The VRF system will control flow of refrigerant through the Indoor units with the electronic

expansion valve fitted in each indoor unit.

The system will be capable of cooling with external ambient temperatures from 15 C to +52 C and

providing heating with ambient temperatures down to20 C

The VRF system will have the ability to sustain refrigerant piping lengths of up to 150m with a level

difference up to 50m between fan coil units and condensing unit if the outdoor unit is located above

the highest level indoor unit.

Each independent system shall be capable of having up to 1000m of refrigerant pipe work installed.

The system shall be capable of having up to 60m refrigerant pipe length from the first separation

tube to the furthest indoor unit.

The VRF system shall operate with Refrigerant R410A.

The equipment manufacturer shall be fully certified and registered to comply in the areas of CE,

Eurovent, ISO9001 and ISO14001.


5/30


PART BMEP WORKS

1.5: VARIABLE REFRIGERANT VOLUME (VRF) OUTDOOR UNITS R410A Heat Pump High Ambient

Condensing Unit

The units shall be air-cooled type incorporating heat exchanger coils manufactured from copper

tubes and aluminum fins, factory treated with Heavy Anti-Corrosion treatment satisfying JRAregulation (4002) to reduce the effect of atmospheric corrosion.

The unit casing shall be manufactured from powder coated baked enamel finish sheet steel in order

to have a high corrosion resistance and to protect against salt laden environment close to where the

units may be installed.

The color shall be manufacturers standard. The air outlet & condenser coil shall have aluminum

coated wire guards.

The outdoor units shall have inverter driven compressor Twin Rotary/Scroll electronically controlled

to follow the variation in cooling or heating requirements.

The outdoor unit fan motor will be DC inverter driven and will operate electronically according tothe running load and pressure to achieve minimum energy consumption and best performance.

The units shall be complete with electronic expansion valve(s), oil separator(s), large sized

accumulator, high pressure switches, hi/low voltage protection, phase revise protection, safety

thermostat, over current relay, fuses, necessary solenoid valves, liquid shutoff valves, gas line shut

off valves, short re-cycling guard timer and all necessary sensors for optimized, safe and trouble free

operation. The access to the internal components for maintenance purposes shall be by removable

panels.

It shall be possible to connect up to maximum number of indoor units, capacity permitting, to one

outdoor unit.

Outdoor Backup operation, in multiple systems shall be possible if one compressor fails the other

Compressor will perform as emergency.

One compressor shall be with variable load. The other compressor(s) shall be on/off type or as per

manufacturer own design / recommendation.

Non Stop oil recovery operation is required to maintain a room comfortable condition with the

continues operation without stopping in cooling or heating operation.

Auto changeover function is required to and the entire product to switch between cooling modes

regardless of operation mode of other indoor units and this can be done via indoor unit with wired

remote controller.

The 8HP & 10HP unit shall have a single inverter driven Twin Rotary/Scroll compressor and an

inverter driven variable speed propeller type fan.

Units Higher than 10HP shall have two compressors, one inverter and one fixed speed and will be capable of

operating on one compressor under emergency condition in case the inverter compressor fails.

The fan will be capable of overcoming a minimum of 80 Pascal of external static pressure.

The units shall be capable of being combined to provide multi systems using combinations of two or

three outdoor units connected to give the capability of higher capacities up to maximum 42 HP.


6/30


PART BMEP WORKS

1.6: INDOOR UNITS:-

1.6.1: Wall mounted type:

The unit casing shall be manufactured from heat resistant plastic. The back plate and the support

frames shall be manufactured from galvanized steel plate.

The fan shall be multi blade cross flow type, statically and dynamically balanced to ensure low noise

and vibration free operation, DC Fan motor to be used to increase the efficiency and reduce noise

level.

The heat exchanger coils will be manufactured from copper tubes and aluminum fins. It shall have

electronic expansion valve to control refrigerant flow rate in response to the load variation in the

conditioned space. The expansion valve shall be controlled by an integral computerized PID control

system to maintain correct room temperature.

The heat exchanger has to be from the large size at least with 2 row coil x 18 tiers with extra sub

heat exchange with 1 row coil x 4 tiers to achieve the maximum cooling.The condensate shall be drained from the unit using suitable tube and run directly to a main drainage

point.

The air filters shall be incorporated within the unit and shall be washable resin net type with the

following features:

1-Long life Ion Deodorization filters.

2-Apple Catechin filters

The unit color should be as per clients requirement.

1.7: CONTROLS:-

Mains Power Wiring shall be the responsibility of the Electrical Contractor who shall provide 3-

phase 400V main isolators mounted on the VRF Condensing Units and 1-phase 230V fused spur

located within 1m of fan coil units.

Controls wiring shall be the responsibility of the Air Conditioning Contractor who shall provide

system control wiring in accordance with the manufacturers recommendations.

Flexible control system, Individual control, group control and network control as per the design

requirement for creating the most comfortable and make the room under the desired and precise

temperature.

1.7.1: Remote Controller

Wired controller will be provided via remote controllers mounted within the occupied space,

providing individual start/stop, Mode setting, timer setting.

The controller shall contain an internal built in temperature sensor, which can detect the actual room

temperature around us then to change the operating mode.

1.8: REFRIGERANT PIPING

Refrigerant pipe work shall be hard copper tubing to ASTM B88 type L.

Refrigerant pipe network should be restricted to the following table:


7/30


PART BMEP WORKS

Details Maximum in Meters

Total Length 1000

Greatest/Equivalent length 150

Greatest Length after the first branch 60 Distance between Indoor & Outdoor (Outdoor higher) 50

(Outdoor lower) 40

Height difference between Indoor/Indoor 15

Suction and discharge refrigerant piping shall be of dehydrated copper tube. Insulated separately

with closed cell rubber foam with a minimum thickness of 19 mm. Both the pipes wrapped with

canvas cloths 6 oz applied with white tough washable abrasion-resistant coating.

Piping penetrating walls shall pass through a PVC sleeve with adequate diameter and sealed

according to general specifications.

Piping penetrating roof slab shall pass through PVC sleeve and to be sealed for waterproof and the

contractor should submit detail-working drawing for the way proposed for consultants approval.Wherever possible straight copper length should be used.

Contractor/Installer should close both end of copper pipe at the end of every working day till

installation period to ensure no foreign particles could be penetrated inside the system.

Installer should allow a small amount of nitrogen gas to be passed through the pipes during all joints/

brazing work is in process till completion.

Prior to the final connection the system should be thoroughly flushed with nitrogen and pressure

tested and this test should be seen and approved by the Consultant/Engineer.

All indoor pipe work should run in cable tray or with proper supports without lagging as

recommended by the manufacture/local supplier. Roof exposed pipe work should run in cable tray

with aluminum cladding.

1.9: CONDENSATE DRAIN:

U PVC drain pipe should be used for the same with insulation to avoid condensation from pipes

connected to nearest floor trap or as directed by the consultant. Cleanout with U trap should be

provided for easy maintenance.

1.10: Control Switch

Each unit shall have a wall mounted electronic control switch with a system on-off switch, room

temperature control thermostat and 3 speed fan control.

1.11: COMMISSIONING & TESTING

Commissioning shall be carried out by a trained engineer with assistance of Supplier.

The entire refrigeration system shall be pressurized with Nitrogen to 38 bar for a period of 24hours.

Leak testing shall be carried out with a calibrated electronic leak detector, or similar if the system

fails to hold pressure within testing period.

Upon completion of pressure test the pressure shall be released and vacuum pump installed on the

system to remove air and moisture from the system. The system shall be evacuated to101.1kPa (-

758mmHg, 2 torr) and held for a period of 2 hours with the vacuum pump switched off.

Refrigerant should be charged to the liquid pipe in its liquid state to ensure that the refrigerant

composition is assured. The refrigerant charge shall be calculated to the system requirements and inaccordance with Suppliers Design and Installation Instruction booklet.


8/30


PART BMEP WORKS

1.3: R410a Split Unit:

The split system shall consist of an Evaporator unit (Ceiling suspended OR Wall Mounted) and

condensing unit (Outdoor Unit) with Wireless or wired remote controller, Indoor & Outdoor Units

to be factory assembled and fully charged with refrigerant R-410a. All units shall be tested andchecked at the factory. Units shall be designed for continuous operation at outdoor ambient

temperature of 52 deg. C. Coils shall have Blue fins or heresite or equal approved anticorrosion

coating.

1.3.1: Wall Mounted:

1.3.1.1 Indoor Unit (Evaporator Unit)

The indoor evaporator unit shall be of the slim and compact design with decorative cabinet.

Units shall be suitable for flush-to-wall installation to conceal pipe connections.

Evaporator coils shall be with V shape Heat Exchanger from seamless copper tubing mechanically

bonded to aluminum fins and shall be factory leak tested at a pressure of 28 kg/cm2.

Evaporator fans shall be direct driven, forward curved, centrifugal type made of galvanized steel to

deliver and accurate air flow at a low noise level. Fan driving components shall be mounted on

rubber pad isolators to reduce noise required.

DC Fan motor shall be used to drive the evaporator fan.

A fan speed control shall be provided to facilitate speed adjustment as required with 5 Speeds +

Powerful mode availability. Each unit shall be provided with a permanent washable filter and swing

flow louvers to eliminate uncomfortable hot spots.

1.3.1.2: Outdoor Unit (Condensing Unit):

Casing of the unit shall be of sheet steel suitably treated to be rust resistant for a long life. Unitsshall have high efficiency, hermetic, line starting compressor.

Each compressor shall be equipped with an internal thermostat, over current relay, a low pressure

switch and a crankcase heater.

Condenser coil shall be of seamless copper tubes mechanically bonded to aluminum plate fins with

protection louvers.

Each coil shall be factory leak tested at a pressure of 33 kg/cm2.

Coils shall have here site or equal approved anti-corrosive coating.

Condenser fans shall be direct driven by a weather proof squirrel cage induction motor. Fans shall

be of the propeller type.

Outdoor unit should be cover by aluminum lover as per AC Drawings.3.0: VENTILATION AND EXHAUST FANS

Supply and install where shown on the drawings ventilation and exhaust fans having capacities as

shown on the same drawing. Construct all apparatus of materials suitable for the conditions

encountered during operation.

Where corrosion can occur, appropriate corrosion resistant materials and assembly methods

Must be used including isolation of dissimilar metals against erosion.

Where in contact with the air stream, protect insulation against erosion of flaking by a factory

applied plastic or mat facing.

Locate and arrange motors, filters, and other components and accessories so that they are

accessible for repair, maintenance and replacement.Mount grease fittings directly on bearings unless the later are not readily accessible. Where


9/30


PART BMEP WORKS

Equipment bearings are not visible or are inaccessible provide easily accessible extensions to

bearings lubrication fittings.

Through clean the entire system before installing filters or operating the fans.

On systems containing filters, install filters and permanently seal the filter frames airtight beforeoperating the fans. The Contactor at his own expenses shall replace all dirty filters before turning

over the system to the client.

4.0: GLASS/WALL MOUNTED EXHAUST FANS

Supply and install glass/wall mounted exhaust fans as shown on the drawings with capacities as

mentioned in the schedules. The fans shall be manufactured from plastic material with external and

internal louvers and manual shutter.

5.0: POWER SUPPLY TO ALL A/C UNITS

Power supply with necessary cables shall be provided by the main contractor till to the weatherproof

Isolator for all roof-exposed units, powers disconnect switch or isolator for all indoor units.A/c contractor shall connect from these isolators to their respective units.

6.0: NOISE, VIBRATIONS & SILENCERS

All air-conditioning equipment shall be mounted on vibration isolators suitably designed to eliminate

any vibrations, which may be transferred to the building structure.

The contractor shall be fully responsible for preventing noise and vibration throughout each

system and in the environment surrounding the buildings. He shall provide all lining materials,

silencers, flexible connections and hot gas mufflers for this purpose, where specified or not.

10.0: SHOP DRAWING/COORDINATION WITH OTHER SERVICES.

Work shop drawing shall be prepared by the AC contractor in 1:100 scale in coordination with all

other services and submitted for approval prior carrying out any work at site unless and until the

consultant/engineer gives site clearance for the same.

Exact location of the following:

Pipes sleeves and duct openings.

nt final connection to all AC units to be done AC contractor.

Height of all room thermostat and central remote controller. Height and size of openings for ducts, grills, fresh air louvers, piping and electrical work

crossing the wall floor.

11.0: GUARANTEE

The contractor shall guarantee all work installed for a period of one year for the whole system and

5years for compressor from the date of testing & commissioning. The warranty is applicable on

original components only and against manufacturing defects, labor and consumables are excluded.

Unit under warranty must be installed, maintained and operated as per manufacturer manuals

**************************


10/30


PART BMEP WORKS

PART # 2

PLUMBING WORKS


11/30


PART BMEP WORKS

1. Testing & Commissioning

1.1 INSPECTIONS AND TESTS AT MANUFACTURERS PREMISES.

No inspections at manufacturers premises are required by the Engineer or Owner.

1.2 INSPECTIONS AND TESTS AT SITE.

A. The contractor shall submit a method statement and sample test sheets to the Engineer and seekapproval before carrying out any tests on site.

B. The contractor shall notify the Engineer in writing 7 days in advance of the expected date of the tests.

C. The Mechanical tests shall follow the procedures prescribed in the relevant codes, as follows:

a. BS specifications and code of practice.b. ASHRAE System Handbook.

c. AABC- National standards for field measurement & instrumentation, Total system balance.

d. NEBB- Procedural standards for Testing, balancing and adjusting of Environmental systems.

e. NFPA & Civil Defense requirements.

f. Manufacturers recommendations.

D. During the tests a complete record as per the approved method statement and procedure shall beprepared by the contractor/subcontractor and shall be approved by the Engineer. The same document shallbe incorporated in the handing over documentation, as detailed in the preceding section of this specification.

E. In certain tests on site a third party or authority witness/approval may be required, the contractor shall beresponsible to cost and liaison with all parties to be available for all such tests.

F. For all such tests the contractor shall afford any assistance, travel, lodging, labor, materials, electricity,fuel, instrument and equipment cost associated with the exercise.

G. Above mentioned inspection, witness tests shall not relieve the contractor at any instance from hiscontractual responsibilities and liabilities.

1.3 COMMISSIONING

A. The contractor must submit a start-up and commissioning method statement to the Engineer forapproval. The commissioning process shall start only after the method statement is approved by theEngineer.

B. The contractor shall notify the Engineer regarding the start-up and commissioning planned dates one

month in advance. The contractor and the Engineer shall mutually plan the witness and inspectionschedules of commissioning. The Engineer will ensure the presence of a representative.Overall commissioning program shall be submitted to the Employer.

C. The contractors scope includes energization of all Mechanical Systems, installations, and controlsystems to ensure proper and safe operation. The performance of the system shall be further tested andinspected as per the procedure detailed in preceding sections.

D. Project completion and start of guarantee period shall start not before the systems are commissioned andreliability runs are done. The system shall run free of defects post commissioning during the guarantee period.In the event of a failure or defect during the guarantee period, rectification and re-commissioning of the systemwill be carried out by the contractor and the guarantee period will be calculated from the latest date of re-commissioning of the system.


12/30


13/30


PART BMEP WORKS

B. Systems may be tested as a whole or in sections to facilitate the progress of the work.

C. No part of any piping system shall be tested to pressures less than the specified test pressuremeasured at the highest point of the system.

D. Care shall be taken not to subject any equipment, apparatus or device to a pressure exceeding itsprescribed test pressure as obtained from its name plate data or from manufacturer's published data.Pressure tests shall be applied before connecting piping to equipment. Relief valves instruments,automatic air vents and all devices that might be damaged by the test pressure shall be removed,disconnected or blanked off.

E. No pressure shall be applied against the closed gate of gate valves. All vales shall be in the openposition but not completely back seated during testing. End valves shall be capped.

F. In testing flanged piping, temporary blank flanges shall be installed and firmly anchored to accommodateall developed end thrust.

G. All piping that can be damaged by end thrust developing from hydrostatic testing shall be properlyanchored during testing especially at changes of direction.

H. The piping system to be tested shall be closed by plugging and blanking all openings in the system inan approved manner and filled slowly with water making sure to vent all entrapped air. Plugs shall bereleased temporarily to ensure that water has reached all parts of the system.

I. Pressure shall be applied to the system by means of a hand pump drawing from a water container. Thepump discharge shall be connected to the system through a globe valve, check valve and recentlycalibrated pressure gauge of suitable range to have the test pressure read in the middle of the range.

J. After the test pressure is reached, the pump shall be blocked off by closing the globe valve and thevariations of pressure in the system monitored on the pressure gauge.

K. The test pressure shall be maintained on the system for 24 hours during which time the system shallhave no noticeable drop in pressure.

L. While the system is under pressure, a careful inspection shall be made of all pipes and joints and if anyleaks in joints or evidence of defective pipe or fitting is disclosed the defective work shall be correctedimmediately by replacing defective parts with new joints and materials. No make shift repairs or applicationof any repair compound will be permitted.

M. After the correction is made the pressure test shall be repeated until a completely tight system isensured.

N. The test pressure shall be released slowly so as not to produce shocks and sudden contractions thatmight damage the piping.

O. All underground piping shall be tested in accordance with the manufacturer's test pressures, beforeback filling can commence. Piping shall be temporarily anchored at regular intervals, as required, beforetesting can begin.

P. A log shall be kept of all tests performed which shall be submitted to the Engineer for approval.

2.4 TESTING OF EQUIPMENT

A. After installation, all equipment shall be tested for performance and proper functioning and fordemonstrating to the full satisfaction of the Engineer that the equipment meets the design requirements asshown on the Drawings and as specified.

B. Should any equipment prove defective, unsatisfactory or does not comply with the Drawings orSpecification, the Contractor shall correct, repair or replace such equipment on his own account as directedby the Engineer. After the correction is made, subsequent tests shall be performed until the equipment isproven to fulfill the requirements to the entire satisfaction of the Engineer.

C. The data to be measured on equipment shall be of such items as given on the schedule of equipmentshown on the drawings.


14/30


PART BMEP WORKS

2.5 REJECTION OF EQUIPMENT

A. Equipment shall be rejected if:

a. It has a capacity less than specified.

b. Its electric motor is overloaded.

c. It causes objectionable noise or vibration.

2.6 TESTING AND ADJUSTMENT OF CONTROLS

A. All controls and instruments shall be operated simultaneously with the equipment or system that theycontrol and tested for proper, accurate and dependable functioning and operation.

B. All controls and instruments shall be calibrated and adjusted to the satisfaction of the Engineer.

2.7 DOMESTIC WATER PIPING STERILIZATION AFTER COMMISSIONING

A. On completion of the potable (hot and cold) water supply services system, the services shall besterilized by the application of chlorine. The minimum requirements for chlorination shall be to flushthe pipe work thoroughly to remove dirt. Chlorine shall then be added to the storage tanks andwater drawn from all draw-off points until chlorine is detected at each outlet point. The mains arethen to be allowed to stand for a period of 24 hours, after which the outlets are to be tested forchlorine. If chlorine is not found to be present, all the above shall be repeated until residual chlorineis detected.

After this, the system is to be completely flushed with clean water and precautions taken to avoidsubsequent contamination of the installation. An independent laboratory test report shall be submittedfor the portability of the water to the Engineers satisfaction.

2.8 DRAINAGE PIPING

A. All drainage piping shall be hydrostatically pressure tested to a minimum of 1.5metres of static headabove the highest point as per manufacturersrecommendations to ensure that all piping and joints arefree from any leakage to the satisfaction of the Engineer.

2.9 TESTING PRESSURES

A. Hydrostatically test domestic water piping (hot and cold) to a pressure of 1035 kPa,or at least 1.5 timesthe working pressure, whichever is greater.

B. Hydrostatically test chilled water piping to not less than 1.5 times the working pressure but no less than1035 kPa (for 24 hour period), whichever is greater.

C. Hydrostatically test fire lines to 1379 kPa for 2 hour in accordance to NFPA 14 and the local authoritysrequirements.


15/30


16/30


PART BMEP WORKS

(4) British StandardsI Codes.

(5) IRVEI Cr83 Guide Books.

(6) Civil Defense Regulations.

(7) Institute of Plumbing Data Book.

2.4 VALVES

2.4.1 General Requirements

Valves shall be installed only in vertical or horizontal positions unless otherwise required by the drawings.

All valves shall be installed in accessible locations to facilitate easy removal for maintenance.

Valves shall be full-line size.

Valves 2 (65 mm) dia. and smaller shall have threaded ends valves 3 (80mm) dia. And larger shall haveflanged ends.

All threaded end valves shall be installed with unions to facilitate the removal of the valve from the pipeline.

Gate valves shall be installed on both sides of every piece of equipment for all pipe- system connections, andwhere show on the Drawings.

All valves shall be designed for a working pressure of 125 psi (860 Kpa)

2.4.2 Tests

All valves shall be tested in accordance with the appropriate section of the Specifications describing each

system.

2.4.1 Gate Valves

Gate valves up to 2 (65 mm) shall be all bronze, screwed ends, non rising stem, screwed bonnet, solid wedge

disc type.Gate valves 3 (80 win) and larger shall have cast iron body, non rising stem, flanged ends, bolted bonnet and

bronze wedge disc faces and seats.

One gate valve shall be supplied and installed.

- At the supply and return from each equipment.

- At the discharge and suction of each pump.

- At the bottom of each riser and all low points to be drained.

- In general at all points shown on the Drawings and/ or specified.

2.4.4 Globe Valves

Globe valves, 2 (65 mm) and smaller, shall be all bronze, screwed ends, rising stem, screwed bonnet

renewable composite disc and seat.Globe valves 3 (80 mm) and larger, shall be east iron, flanged ends rising stem, bolted bonnet, renewable

composite disc and seat.

2.4.5 Check Valves

Check valves 2 (65 mm) and smaller, shall be all bronze, screwed ends, screwed cap with horizontal lift

check, renewable composite disk and seat. Valves 3 (80 mm) and larger, shall be cast iron, flanged ends,

bolted cap with swing check, renewable composite disc and seat.

One check valve shall be installed:

- At the discharge of each pump- At all points shown on the Drawings and /or where specified.


17/30


PART BMEP WORKS

2.4.6 Float Valves

Supply and install all float valves as shown on the Drawings and wherever specified in this book ofspecification.

Float valves 2 (65 mm) and smaller shall be all bronze screwed ends, float operated. Valves 3 (80mm) and

larger shall be cast iron body, flanged ends and float operated. Float shall be copper and mounted at the end of a

brass or copper rod, which actuates valve operation.

2.4.7 Automatic Air Vents

Supply and install all automatic air vents as shown on the Drawings and wherever specified in these book

specifications

Automatic air vents of the spherical float type shall be installed at all high points in the piping. Vents shall have

cast iron housing and bolted cover with gasket, Float shall be constructed of stainless steel. Vents shall be

suitable for a maximum operating pressure or 150 psi (1030 Kpa). A1/2 (15 mn) lock shield valve shall bedirectly installed ahead of each automatic air vent, and a (15 mm) drain line shall be provided to discharge

at a convenient point.

2.4.8 Ball Valves

Valves shall be bronze, with screwed ends, Teflon stem packing seals, Teflon seats T handle for I and

smaller, insulated operating lever for larger than 1. Valves shall be rated at 150 Psi working pressure.

Valves shall be suitable for use either with water, compressed air or oil serves.

2.4.9 Foot Valves

Valves shall be bronze with screwed ends, single puppet, metal to metal replaceable seat, puppet shall be

bronze construction, screen shall be of brass. Temperature and pressure ratings shall suit the intended service

application.

2.4.10 Temperature and Pressure Relief Valve

This valve shall be used on domestic hot water lines wherever applicable.

Temperature and pressure relief valve shall be self-closing type with text lever and screwed connections.

Valve shall be suitable for a pressure of 75 to 150 psi (520 to 1030 Kpa) service and shall be supplied with

temperature relief set at 210 deg. F (100 Deg. C)Valve shall be AGA and ASME rated and similar to watts Regulator Co.

2.4.11 Pipe Expansion Joints

Supply and install expansion joints wherever pipes cross structural expansion joints, and wherever required to

prevent undue stresses caused by thermal expansion to the pipes.

Expansion joints shall be of the pack less-bellow type with flanged or welded ends as suitable for the pipe

application.

Bellows shall be of stainless steel and suitable for a pressure of 125 psi ( 860 Kpa ) or the design working

pressure, whichever is greater. Expansion joints shall be provided with guides to prevent any unnecessary

misalignment of the -pipe. Guides and anchor arrangements shall be as per the recommendations of the

expansion joint manufacturers.


18/30


19/30


PART BMEP WORKS

Automatic air vents shall be installed at all air pocket locations, and/or at the highest points in the lines.

Pipes and fittings shall both be manufactured according to one single standard unit of measurement, either both

English and both metric.

All drainage and rain water pipes running underground, under the building, shall be encased in concrete for the

whole length.

2.5.4 Pipe Classes

A- Type-1

Polyvinyl chloride pipes (PVC) shall be of the un-plasticized rigid type and of high density and completely

homogeneous material.

PVC pipes-Type-1 shall comply with BS 4514 for Soil and BS 5255 for Waste and

Vent or DIN 19534 atmospheric pressure rating and tested at maximum static head.

PVC pipes Type-1 shall be of the integral plain socket suitable for solvent welding with special adhesive or with

push fit ring seal.

PVC pipes-Type-1 are allowed to be used for:

- Drainage and vent pipes above ground.

- Storm drain above and under the structures.

B- TYPE-2

Polyvinyl chloride pipes (PVC) shall be of the un plasticized rigid type and of high Density and completely

homogeneous material.

PVC pipesType-2 shall comply with P.5.4660 for sizes up to 6 diameter and to BS 5481 for sizes above 8

diameter atmospheric pressure rating and tested at maximum static head. PVC pipes shall be of the single socket

type with ring seal.

PVC pipes-Type-2 are allowed to be used for drainage, sewer and storm water application, under the structures.

C- TYPE-3

Polypropylene Copolymer Random (PP-R) pipes with PN 20 pressure rating shall be manufactured according to

Din 8077/8078; fittings shall be manufactured according to DIN 16962. for drinking water in houses and

residential buildings . Pipes should be corrosion free and resistant to thermal aging and should not hold any

deposits inside and should reduce flow noises to a large extent.Pipes and fittings shall be joined using electro-fusion welding process. Welding shall be made as recommended

by the manufacturer. Welding machine and tools should as per manufacturer recommendation. Threaded fittings

shall be used to connect to other piping systems, fixtures etc., fittings with metal insert shall be sealed withTeflon tape. Pipe connectors shall be of brass that is nickel plated and chromed.Pipe should be designed for continuous temperature of 0 deg. C to 90 deg. C. and short-term peak temperatures

of up to 100 deg. And should have a pressure rating of 65 bar 20 deg. and 16 bars at 95 deg. C.

Each pipe should of for (4) meter length.

PP-R piping system shall be installed with special pre-caution for thermal expansion especially for exposed

installation.

Thermal expansion shall be compensated by use of proper elbow, fittings as recommended by the manufacturer.PP-R pipes shall not be installed or store under direct UV light. To reduce longitudinal

Expansion with heat load and to resist long time exposure to UV light, pipes in shafts and roof shall be of multi-

layer PP-R aluminum, mechanically stabilized by means of integrated combination with aluminum, consisting of

main pipe PP-R coated with aluminum and covered with PP-R treated. Pipes on roof shall be insulated and

cladded.

Pipe bending shall be generally avoided; PP-R pipes and fittings shall be certified for portable water use by arecognized European Standard.


20/30


PART BMEP WORKS

Pipes should be guaranteed for 10 years.

PVC pipes-Type-3 are allowed to be used for Domestic hot and cold water inside the villas.Note: All pipes should be as per standard requirements by the concerned authority.

2.6 DOMESTIC WATER PUMPS

2.6.1 General

All domestic water pumps shall come complete as a package set incorporating base frame run stand by controls

and alarms, duty sharing timer and control panel. The complete package shall be constructed and tested by the

manufacturer ready assembled for connection to the system.

2.6.2 Transfer Pump

The contractor to provide and install above the underground water tank an automatic Transfer Pump Set

consisting of 1 duty /standby (cyclic changeover). Pump to fill roof tank should be through UPVC riser pipe of

inner dia. 11/2 or above.The pumps shall be centrifugal vertical multistage having stainless steel stage casings/ impellers & shaft, electro

coated cast iron casing.. The pumps shall be fitted with silicon carbide / carbon mechanical seals. The driver

shall be T.E.F.C. Motor suitable for 3 Phase / 415 V / 15 KW/ IP54/2900 RPM/Class F.

The pumps shall be interconnected by 3 x 3 copper pipe work incorporating strainers on the suction side of

each pump, flexible connector & gate valve on suction and discharge of each pump and a silent non-return valve

on the discharge of each pump.

1 No. pressure gauge should be fitted to the pump discharge manifold, as well as one no. gate valve at the outlet

end of the discharge manifold.

The control panel shall incorporate 1 No. ELCB, star-delta starters, Hand-off-auto-switch, door interlock isolator,

duty selector switch, run, trip, power on lamps, incoming MCB, back-up MCB. Control fuse, low voltage control

circuit, terminal for float switch connection.The operation of the pump set should incorporate cyclic changeover of starting sequence, duty / standby mode,

auto changeover in case of duty pump failure.All the above items to be mounted on a galvanized base frame.

2 Nos. float switches having 10 Mtr. cable with PVC coated brass counter weight shall be provided (one each in

suction & roof tank).

The complete pump set should be assembled, supplied, commissioned & guaranteed by an authorized local pumpagent.

Contractor should cover pump by aluminum louvered as per plumping drawings.

2.6.3 Booster Pump

The contractor to provide and install near the roof water tank an automatic booster set consisting of 1 duty

/standby or assist (cyclic changeover) , through 2 inside dia. (I.D.) U.P.V.C. Pipe.

The pumps shall be horizontal centrifugal stainless steel suction / discharge chamber casing, impellers & shaft.

The pumps shall be fitted with ceramic / carbon mechanical seals. The driver shall be T.E.F.C. Motor suitable for

1 Phase / 240 V / IP55.

The pumps shall be interconnected by 1.1/2 x 1.1/2 copper pipe work incorporating strainers on the suction side

of each pump, flexible connector & gate valve on suction and discharge of each pump and a silent non-return

valve on the discharge of each pump.

2 Nos. pressure switches & 1 No. pressure gauge should be fitted to the pump discharge manifold, as well as one

no. gate valve at the outlet end of the discharge manifold.

1 No. 226 Ltr. Noncorrosive Composite pressure vessel fitted with replaceable diaphragm suitable for 8 bar

working pressure should be provided. Pressure vessel should have one no. ball valve fitted in the line between

the pr. vessel and the discharge manifold of the pump set.

The control panel shall incorporate 1 No. ELCB, pump starters, Hand-off-auto-switch, duty selector switch, run,trip, power on lamps, incoming MCB, back-up MCB. Control fuse, low voltage control circuit, terminal for float

switch connection.


21/30


PART BMEP WORKS

The operation of the pump set should incorporate cyclic changeover of starting sequence, duty / standby / assist

mode, auto changeover in case of duty pump failure.

All the above items to be mounted on a galvanized base plate with anti-vibration rubber pads.

1 No. float switch having 5 Mtr. cable with PVC coated brass counter weight shall be provided in the suction

tank.The complete pump set should be assembled, supplied, commissioned & guaranteed by an authorized local pump agent.

Contractor should cover pump by aluminum louvered as per plumping drawings.

2.7 EQUIPMENTS

2.7.1 Central Water Heater (if required)

Contractor shall supply and install central water heaters as specified here under with all required works and accessories,

including, pressurized inlet water connection, hot water supply and return connections, drain lines, isolating valves,

safety valves, expansion tanks, monitoring gauges, electric wiring and control panels.

Water heater shall be electric storage type, suitable for high pressure system, supplied from reputable manufacturer and

covered by a minimum of 5 years guarantee.Water heaters shall comply with the following specifications and requirements:

Inner tank shall be deoxidized copper with 99.9% purity joined by high-tech ITC welding. Insulation shall be CFC - free

polyurethane foam with not less than 30mm thickness. The outer casing shall be constructed from pre-painted sheet steel.Heating element to be immersion type for maximum power input constructed of nickel chromium resistance wire

sheathed mineral filling and encased in copper tube, suitable for 1-phase, 240v. Thermostat shall be capillary fluid type

adjustable between 60oc and 85oc in addition to a thermal safety cut-out (90oc setting) with manual reset and an

externally adjustable thermostat (control knob). A safety valve group which includes expansion relief, non-return and

stop valve shall be installed on cold water inlet. Piping shall be configured to comply with ASHRAE requirement for heat

retention. An expansion tank shall be installed for each heater with capacity not less than 500 liters.

All central water heaters shall have a tested pressure at 12 Bar and designed for a working pressure of 6 Bar and shall

comply with ISO 9001, BS 5750 & IEC.

2.7.2 Water Cooling System (if required)

Supply, install and commission, as shown on the drawings and detailed herewith, water cooling system for filtered water

storage tank on the roof, to ensure that water temperature supplied will not rise more than 22c at all times.

Water cooling system to include: Chiller, circulating pump set, pressure vessels, automatic controls, concrete foundation,

pipe insulation, electrical and plumbing works. System should run completely automatic, trouble free, including all

necessary controls and safety devices to ensure proper functioning of the system and availability of chilled water in

storage tank even in warmest weather conditions. All accessories and fittings should not have any effect on water quality.

Chiller nominal rated capacity shall be 10 Ton. for each and shall be suitable for 415 volts, 50hz, 3phase. Water chillershall be capable of operating at ambient temperatures up to 52c. Chiller heat exchanger shall be jacketed

316 stainless steel. Chiller shall be equipped with silica filter drier to eliminate the moisture content and prolong life of

condensing unit. Condenser fan motor shall include overload protection with class f insulation. Fan motor speed shall not

be more than 1000 rpm. Chiller shall include low and high pressure switches and anti-recycling timer control. Chillershall be complete with control panel. panel to include the following minimum features: Main circuit breaker, MCCB for

each chiller, Over load relays, Elcb on main, Ammeter and voltmeter, A.O.H. switches, Phase failure protection,

Run/Trip indicators, Power on indicator, Low level indicator, 24 volt control circuit, Provision for dry run protection,

Provision for inter locking with circulating pumps, Digital display for the temperature in water tank.

System shall include fully packaged circulating pump set to circulate water through chiller. Set shall include 2 nos.

pumps with one working and one stand-by with control panel. Pumps shall all stainless steel casing, shaft, impeller,

propylene seals, and shall be suitable for up to 12 bar working pressure,-20 to +110c liquid temperature range. Pump

duty to be 65 gpm @ 15 mtr. head.

Circulating pumps control panel to include: Main incomer door interlock isolator, Power 'on' indicator, MCB and elcb for

each pump, ammeter for each pump, voltmeter, phase failure relay with indicator, H.O.A. switches for each pump,

run/trip indicators, timer control, water tank low level indicator, low voltage supply (24 v a/c) for switches.


22/30


23/30


24/30


PART BMEP WORKS

The Roof Outlets should consist of body assembly, clamping ring and a domed or flat grate. Designed for use with

bituminous or multi-layer waterproofing membranes.

These should be dressed into the outer sump, and the clamping ring secured over the waterproofing layer with bolts

provided, to prevent water ingress between waterproofing membrane and roof outlet. The grating to act as a guard

against airborne debris from blocking the outlet.

2.8.3 Balcony Drains

Balcony Drains will be of Shallow type Drain of HDPE Material with horizontal / vertical outlet of 50mm with

110x110mm Stainless steel Grating..

2.9 Sanitary Wares and Fixtures.

2.9.1 Scope of Work

The contractor shall supply all sanitary wares and fixtures as shown in the drawings and as per basic prices (refer to the

B.O.Q.) and as per list of manufacturers for the following:

a) Wash area & Toilets (G-04,G-05 )b) Master bathroom (F-02)c) Bedroom bathrooms (F-04,F-09 & F-12)d) Maids Bath (G-15)e) Driver Bath (G-10)

Notes:

The prices mentioned in the B.O.Q. are for the supply of the following items as per Consultant/Clients choice.

Contractor shall include in his price for installation, connecting fittings, related builders work, his overhead and profitetc.

a-Fixtures

1- Washbasin (countertop and Pedestal).

2- W.C with cistern, fitting and seat & cover.

3- Bidet.4- Bathtub.

5- Shower tray.

b- Mixers

1- Wash Basin Mixer.2- Bath Mixer.

3- Shower Mixer.

4- Bidet Mixer.

5- Shattaf (spray hose).

c- Accessories

1- Soap dish for washbasin and bidet.

2- Soap & sponge dish for bathtub.3- Soap & sponge dish for shower area.

4- Towel rail.

5- Robe hook.

6- Paper holder.

7- Shelf.


25/30


26/30


27/30


28/30


PART BMEP WORKS

PART # 3

FIRE FIGHTING WORKS


29/30


PART BMEP WORKS

FIRE FIGHTING SYSTEM

A) FIRE EXTINGUISHERS:-

1.1.1. General:

1. Fire extinguishers shall comply with NFPA-10 for installation.

2. The distribution of fire extinguishers shall comply with the prescribed requirements of NFPA-10, as shownon the drawings and the specific requirements of the local Civil Defence Authorities.

3. Cabinets housing fire extinguishers shall not be locked.

4. Portable fire extinguishers shall be maintained in a fully charged and operable condition, and kept in theirdesignated places at all times when they are not being used.

1.1.2. ABC Dry Powder Fire Extinguisher:

ABC Dry powder fire extinguishers shall be manufactured in accordance with BS EN 3 standards and shall be

operated by means of a lever operated valve provided with a safety pin which shall allow a controlled partial

discharge. The cylinder shall have minimum working pressure of 14bar. The temperature shall range from -20

to 60 degree. The extinguisher must have a plastic base. It must be coated inside by electrostatic PVC resin to

resist corrosion. The cylinder shall be made special cold rolled steel sheet with Argon/CO2 welding process and

the suction tube shall be made of PVC material.. All extinguishers shall carry instructions for use in English andArabic.

The Dry powder fire extinguishers shall have LPCB approval/KITE mark approval and have Abu-Dhabi Civil

Defense approvals.

Multipurpose Dry Chemical Extinguishers (Class A, Class B, and Class C Fires).

The capacity of the extinguisher shall be 4Kg and shall have a fire rating of 21A and 113B Rating as shown in

the drawings.

1.1.3. Carbon Dioxide Fire Extinguisher:

Carbon dioxide fire extinguishers shall be manufactured in accordance with BS EN 3 standards and shall be

operated by means of a lever operated valve provided with a safety pin which shall allow a controlled partial

discharge. The cylinder shall be made of high grade seamless steel and shall have high gloss polyester finish.

The cylinders shall be tested to 250 bar.

The temperature range for safety operation shall range from -20 to 60 degree. The extinguisher shall be

electroplated PVC resign coated to resist corrosion. The suction tube shall be Aluminum. The CO2 fire

extinguisher capacity shall be of 2 Kgs and the rating shall be 55B as shown on the drawings. All extinguishersshall carry instructions for use in English and Arabic.

The Carbon dioxide fire extinguishers shall have LPCB approval/KITE mark approval and or manufactured

complying with BS EN3 standards and have Abu-Dhabi Civil Defence approvals.

B) FIRE PLANKET:-

Fire blanketsare made of fire resistant glass fiber fabric. Each family should have afire blanket. It is easy touse and good for putting out small fires, especially in the kitchen. It is also an excellent first extinguisher in a

car, boat, caravan or holiday home. TheFire blanketcan be released and cover the flame in LESS THAN FIVESECONDS!Nothing could be simpler.

Fire blanketcan be used to extinguish fires in small electrical appliances (toaster, coffee maker, etc.), rubbishbins, clothes, tabletop fires caused by candles or fat pan fires.


30/30

Contractor should provide Fire Planket in each kitchen.

Contractor should submit sample of Fire Planket to get approval from Client and Consultant.

C) FIRE ALARM & BREAK GLASS:-

Contractor should provide Fire Alarm in each villa. (Material approved by Civil Defence).

Contractor should provide Break glass in each floor for each villa. (Material approved by Civil Defence).

**************************

Documents

Mechanical Specifications for Villas