GENERAL CONDITIONS OF CONTRACT specs for STP -9-9-16.pdfcommissioning and running of the STP for its commercial utilisation is also to be included in the scope of contract, such items

AI SATS SEWAGE TREATMENT PLANT

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TECHNICAL SPECIFICATIONS & SPECIAL CONDITIONS OF CONTRACT

FOR SEWAGE TREATMENT PLANT CAPACITY: 120 KLD


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1.0 DOMESTIC SEWAGE TREATMENT PLANT

1.1 Preamble

The Sewage treatment plant has been planned and the plant

capacity is 120 KLD. Technology preferred is SBR (Sequential

Batch Reactor) which should be well compact, clean and

efficient plant.

Technology shall be certified/ accepted based on following

terms,

1. Area occupied( Equalisation tank to final tank and sludge

management)

2. Power Consumption ( from bar screen to final tank)

3. Inlet and Outlet parameters shall be as in clause 1.2

4. Payback period

5. Cost per KL for treatment ( O & M only)

6. Maintenance cost for next 3 years

Tender has been provided with only bill of materials for STP

capacities. Vendor need to confirm the materials availability

quantity need to be confirmed while quoting. Any discrepancy

in qty shall be justified by vendor with proper backup

calculations.

The main source of effluent is waste water resulting from

Toilets, kitchen. The scope of work includes design, drawings,


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getting approvals from statutory bodies, coordinating during

construction, erection, commissioning and obtaining best

results of completely below ground domestic sewage

treatment plant with electrical, mechanical and piping. The

treated effluent should be fit to reuse for flushing, gardening

and HVAC application purpose. The work is required to be

carried out on a turnkey basis covering a guarantee of

satisfactory performance as per the standards laid for a

minimum of 2 year.

1.2 Inflow and outflow characteristics

Raw Effluent

PH: 6.5-8.5

TSS : 200-300 mg/l

BOD 5: 250 to 350 mg/l

COD : 500 -800 mg/l

Treated Effluent ( As per PCB norms)

PH: 7-7.5

TSS : < 10 mg/l

BOD 5: < 10 mg/l

COD : < 100 mg/l


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1.3 Scope and brief of contract

The Tender is invited on “ Turnkey basis for design, Engg,

Supply and Co-ordinating with construction works, erection

and commissioning “ of sewage treatment plant to produce

treated effluent quality as per contract and State pollution

control board ( SPCB) norms, whichever is superior in

quality.

Following items are within the scope of contract.

a. Drawings ( As per clause 1.5)

b. Data sheets ( As per clause 1.6)

c. Make of material document

d. Site visits before, during and after completion of

installation till contract period validity.

e. Co ordination with civil, electrical, plumbing and other

vendors related to STP works

f. Co-ordination with consultants

g. Equipment testing, transportation, installation, onsite

testing and commissioning

h. Collection samples at inlet and outlet, monthly once and

submitting for analysis and obtaining certificate from

lab for consultants review

i. Operation manual with trouble shooting techniques

j. Pay back calculations based on M & E cost

k. Running cost as per KL.

1.4 Drawings


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The drawings provided with tender are preliminary and area

allotted is fixed. However, the successful vendor will be

required to submit the detailed process and structural

drawings incorporating the thickness of various structural

members. These detailed drawings shall be submitted to

consultants for their comments and approval.

Drawings to be submitted by succeeded vendor,

1. Layout plan at various levels

2. Sections at critical places ( min 5 to 6 sections)

3. Hydraulic flow diagram, showing levels of structure and

water flow

4. Piping layout ( showing colour code, valves, levels of pipes

running and supporting details)

5. Panel layout

6. SLD for panel

7. Wiring layout from panel to equipments showing proper

supports

8. Minimum 2 sections need to be submitted showing

equipment and piping layout.

9. Fabricating equipments detail construction drawing with

construction brief.


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1.5 Data sheets

Vendor has to submit all the technical details for equipments

used for operation of plant. Vendor need to submit details of

equipments in the form of data sheet attached in annexure

and necessary supporting manufacturing cut sheets need to

be attached. All fabricating equipments need to be submitted

with drawing and technical detail of material used for

construction and IS codes or standards followed to fabricate

the equipments.

1.6 General Details

a) Supply,erection,testing and commissioning of

interconnecting between various units and equipments as per

approved piping layout including all materials like PVC pipes,

fittings, valves, gaskets, flanges, nuts and bolts including all

materials required for necessary pipe supports and associated

civil works etc complete.

b) Supply, erection, testing and commissioning of all the

equipments required for the sewage treatment plant as per

the individual equipment specification and details given

herewith.

c) Supply, erection, testing and commissioning of all

electrical works including all electrical motors for the various

equipment, cabling. LT panel, starters etc. also includes

coordinating all necessary civil works like construction of

panel foundations, cable trenches, cable supports.


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1.7 General

All equipment GA drawings shall be submitted to consultant

for approval prior to fabrication/ placing an order. The

fabricated and brought out equipments shall be inspected at

vendor place by consultant and shall be dispatched to site

only after obtaining clear dispatch instructions in writing from

consultant.

It is obligatory on the part of the intending bidder to visit the

site of work prior to submitting the offer and familiarize

himself with local/site/soil conditions, availability of men,

Materials and Machinery for successful and timely execution

of the works. No extra shall be paid in case vendor fails to

ascertain correct site conditions before submitting the offer.

Any other item not specifically mentioned in this tender but is

essential for proper and successful completion,

commissioning and running of the STP for its commercial

utilisation is also to be included in the scope of contract, such

items shall be highlighted before finalizing contract.

“STP vendor has to coordinate with project management/

builder/client and consultant to establish the plant and to run

the plant successfully.

1.8 DETAILS OF CIVIL WORKS

a) The entire existing tanks presently at site shall be cleaned with

water and some cleaner agents as these same existing tanks itself will be utilized for our present STP of 120 KLD.


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b) Oil and Grease Chamber- 1no. It is proposed to construct one no. oil and grease trap of size as indicated in the drawing in RCC M-30 construction with necessary CM plaster finishes with WPC & generally as per the details available in the approved shop drawing.

c) Bar Screen Chamber - 1 no.

It is proposed to construct one no. Bar Screen Chamber of size as indicated in the drawing in RCC M-30 construction with necessary CM plaster finishes with WPC & generally as per the details available in the approved shop drawing.

d) Sludge Holding tank of size as mentioned in the BOQ. The tank shall be in RCC M-30 and as in (b) above.

e) Final Treated water tank of size as mentioned in the BOQ. The tank shall be in RCC M-30 and as in (b) above.

f) Working platform, staircase etc., as required. The work shall be in RCC M-30 and as in (c ) above.

g) Miscellaneous works such as pipe / cable trenches, chambers,

equipment foundations, staircase headroom at entry of STP etc.,

h) Plant Room of size as required.

1.9 LIQUID RETAINING STRUCTURES

The contractor shall take special care for concrete for liquid retaining structures, underground structures and those others specifically called for to guarantee the finish and water tightness. The minimum level of the surface finish for liquid retaining structures shall be that of smooth, dense, well compacted concrete showing well marks of well fitted shuttering joints. Contractor shall make good any blemishes all such structures shall be hydro tested.


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The contractor shall include in his price of hydro-testing of structure, all arrangements for testing such as temporary bulk heads, pressure gauges, pumps, pipe lines etc.,

Any temporary arrangements that may have to be made to ensure stability of the structures shall also be considered to have been taken into account while quoting the rates. Any leakage that may occur during the hydro-test or subsequently during the defects liability period or the period for which the structure is guaranteed shall be effectively stopped either by cement/epoxy pressure grouting, grunting or such other methods as may be approved by the Engineer. All such rectification shall be done by the contractor to the entire satisfaction of the Engineer at no extra cost to the Employer.

2. SEQUENTIAL BATCH REACTOR

The Treatment plant comprises of following units: PART A: Civil units 1. Oil and Grease Trap 2. Bar screen Chamber 3. Equalization Tank 4. SBR tank 5. Decant 6. Final treated water tank 7. Sludge Holding tank

PART B: Electromechanical Equipments 1. Raw sewage lift pumps 2. Blowers 3. UPVC/ GI pipes 4. Sludge Transfer Pumps 5. Screw Pumps 6. Mechanical Filter press 7. Diffusers


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8. Monobloc filter feed pumps 9. Pressure Sand Filters 10. Activated Carbon Filters 11. Chlorine Dosing system 12. UV treatment

PART A: Civil units

Oil and Grease Trap: Oil and Grease is separated in this chamber and only effluent without oil and grease is allowed to flow for further process Bar screen chamber: This removes foreign materials such as plastic, rag or any other solids/ floating matter along with the incoming effluent. Equalisation Tank: In this compartment air is pumped and the liquid is churned to make a uniform suspension of the particles. SBR Tank: The tank is divided into pre-aeration and main aeration tanks by a baffle wall with openings at the bottom. The sewage flows continuously into the pre-aeration tank, which acts as a biological selector enhancing the growth of the most desirable organisms while limiting the growth of filamentous bacteria. Sewage from pre aeration tank flows through openings at the bottom of the baffle wal l and into the main aeration tank where BOD removal and nitrification occur. After aeration phase, sludge separation occurs in the settling phase. Decant Tank: After settling, the clear water from top is removed through a PLC operated decanter. De-nitrification occurs during anoxic periods of settling and decant phases. The excess sludge is wasted during decant phase. Final Treated water Tank: The SBR treated water is disinfected using Sodium Hypochlorite and filtered through a Pressure Sand Filter, activated carbon filter and finally through UV system. The final treated water will be stored in


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the final treated water tank for recycling, for Landscape and for flushing purpose. Sludge Holding Tank: The excess sludge is dewatered using sludge filter press.

PART B: Electromechanical Equipments:

Raw Sewage Lift pumps: Pumps the sewage from Equalisation tank to SBR tank Blowers: Blows the air to diffusers provided in both equalisation tank and in SBR tank UPVC/ GI pipes: Pipe materials used for interconnection piping and for blower piping’s. Sludge transfer Pumps: Transfers the sludge from SBR to Sludge holding tank. Screw pumps: Transfers the sludge from Sludge holding tank to filter press. Mechanical Filter Press: Presses the sludge in the form of cakes so that it can be used as manure. Diffusers: Diffuses the air into tank Monobloc/ Submersible filter feed pumps: Pumps the water from Decant tank to Filter units. Pressure Sand Filter: Removes Suspended impurities Activated Carbon Filter: Removes Odour and Colour Chlorine Dosing system: Acts as disinfectant UV Treatment; Acts as 100% disinfectant killing all bacteria’s.


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3. 0 Design of Individual units:

3.1 SS Bar screen chamber: Provide a chamber of size 1.5m

length x 0.5m width x 0.7m height to accommodate an

inclined coarse and fine bar screens. Coarse bar screen shall

be MS bar screen with 5mm thick flats at spacing of 10mm

whereas fine MS bar screen is with 5mm spacing.

2. Equalization tanks capacity : 48000 liters considering

average flow of 20 hours.

3. SBR tank capacity: 84000 liters with Pre aeration tank of

capacity 24000 liters.

4. Calculation of air volume

BOD after treatment < 10mg/liter

BOD5 loading = 350 mg/liter

Total BOD5 load = 120 x 1000 x 350/( 1000000) = 42 kgs/

day

Oxygen required = 42 x 2 = 84 Kgs / day

( 2kgs of oxygen is required for every kg of BOD 5 to be

removed)

% of oxygen in air =0.21; density of air =1.2

Air requirement = 84/0.21= 400/1.2 = 333 cum/day

Air requirement = 24 cum/ hr

Diffuser transfer efficiency @6% /m liquid depth

Considering avg 3.0m liquid depth, effective efficiency =

18%

Air requirement shall be 133 cum/hr ( SBR tank alone)


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Considering 50% excess assuming air requirement in the

equalization tank/decant tank etc

Total air required = 200 cum/hr

5. Pressure Sand filter : Considering 12cum/sqm/hr loading

and 12 hours operation of filter ; 1000mm dia filter to be

provided

6. Activated Carbon filter : Considering 12cum/sqm/hr loading

and 12 hours operation of filter ; 1000mm dia filter to be

provided

Chlorination:

The filtered water is further chlorinated through an online

automatic chlorination system with electronic dosing pump

for disaffection. Provide 1 no. 100 liter capacity automatic

chlorinator with electronic metering pump to ensure the

residual chlorine level to be less than 2PPM for disinfection

so that it will not affect plantations.

Treated water tank:

One number of treated water tank of 40 kld capacity to hold

filtered water and to use for flushing and gardening shall be

constructed.

Civil Units and its sizes

Sl.No Name of the Unit Size in m


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1 Oil and Grease Chamber 1.5m x 1.3m

2 Bar screen chamber 1.5m x 0.5m x

0.75m

3 Equalisation Tank 3.35m x 3.96 x

3.1m

4 SBR 3.65m x 7.34 x 4.3

5 Decant tank 3.96m x 2.75m x

3.1m

6 Sludge Holding tank 2.45m x 2.3m x 3.1

7 Final treated water tank 4.84m x 2.45m x

3.1m

8 Pumproom/ plant room 2.45m x 10.7m

Mechanical equipments Proposed

Sl.No Item Qty

1 Bar screen ( Coarse + fine ) 1 No.

2 Raw sewage transfer pump 2 Nos. ( 1W + 1S)

3 Air blowers 2 Nos. ( 1W + 1S)

4 Sludge transfer pumps 2 No. ( 1w + 1S)

5 Filter feed pumps 2 Nos. ( 1W + 1S)

6 Pressure Sand filter 1 No.

7 Activated carbon filter 1No.

8 Chlorinator 1 No.

9 Treated water pumps 2 No. ( 1w + 1S)

10 UV system 1 No.


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4.0 DETAILS OF PIPING WORK

Following piping works including excavation, back filling, masonry / structural pipe supports, puddle flanges, concrete bedding, pipe specials and GM D/F Valves of LEADER (or approved CI valves or approved equivalent make only and or CI D/F Valves of KIRLOSKAR / LEADER make only are all included in the scope of contract. The quantity and sizes of the pipes are indicative, the contractors to quote for the designed sizes of the pipes.

80 dia PVC Pipe recommended make from screen chamber to

equalization tank appx. 100 NB dia PVC pipe recommended make Wherever the necessary piping work should be carried out with

required dia etc complete.

5.0 Equipment Specification

a) MS Bar screen

Type : Manually cleaned with hand rake

Construction : MS flats of 5mm thick with

spacing 10mm c/c for coarse and

5mm c/c for fine.

b) Raw Effluent pumps

Flow and Head : 15 cum/hr at 12 m head

Type : Vertical Submersible type pumps

Motor : Built in Vortex pump


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Material of construction : CI Body and impeller

c) Diffusers

Fine pore Diffusers :67mm dia x 1000mm long PVC

10kg/sqcm slotted pipes with

threaded end caps, SS clamps and

earclips, braided PVC air hoses and

nylon hoisting ropes.

Coarse Bubble Diffusers : 80mm dia x 800mm PVC

10kg/sqcm slotted pipes with

threaded end caps, SS clamps and

earclips, braided PVC air hoses and

nylon hoisting ropes.

d) Air blowers

Flow and Head : 200 cum/hr at 0.5 kg/sqcm

Type : Twin lobe compressor

e) Return Sludge pumps

Duty : 10 cum/hr @ 10m head

Type : Horizontal centrifugal non clog

self priming, open impeller

Motor : TEFC motor IP 55 rating,

protection and suitable for 400/

440V, 50 Hz AC supply

MOC : CI body and Impeller


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Accessories : Air cock with priming funnel,

flexible coupling with guard, base

frame, foundation bolts etc.

f) Filter feed pumps


Type : Horizontal centrifugal non clog

self priming, open impeller




MOC : CI body and Impeller

Accessories : Air cock with priming funnel,

flexible coupling with guard, base

frame, foundation bolts etc.

g) Pressure Sand Filter

Material : FRP

Under drain : Perforated bottom plate with

plastic strainers or central headers

and laterals

Media : Graded River sand and gravel

h) Activated carbon Filter


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Material : FRP

Under drain : Perforated bottom plate with

plastic strainers or central headers

and laterals

Media : Activated carbon with gravel

support

i) Multi stage screw pump





MOC : CI body and Impeller, alloy steel

rotating parts

j) Filter Press

Type : Automatic hydraulic closing

mechanism as per BOQ

6.0 SITE CONDITIONS

Temperature : Maximum 380C Humidity : Minimum …60% at 300C Existing Units : 1 No.


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7.0 SITE CLEARANCE AND CLEANUP

The contractor shall, from time to time clear away all the debris and

excess materials accumulated at site.

After the equipment and appliances have been installed and

commissioned, contractor shall clear-up the same and remove all

plaster, paint stains, stickers and other foreign matter of discolouration

leaving the same in a ready to use condition.

On completion of all the works, contractor shall demolish all the

temporary structures, remove all surplus material on written

permission of the Engineer, and leave the site in a room clean

condition.

8.0 EXECUTION OF WORK

The work shall be carried out in conformity with the approved drawings

and within the requirements of architectural, electrical and other

specialized services drawings.

The contractor shall co-operate with all trades and agencies working

on the site. He shall make provision for hangers, sleeves, structural

openings and other requirements well in advance to prevent hold up or

progress of the construction programme. Any work done without

regard (or) consultation with other trades, shall be removed and

rectified by the contractor without additional cost to the Employer.

On award of the work, contractor shall submit a construction

programme in the form of a PERT chart or Bar chart for approval of the


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Engineer. All dates and time schedule agreed upon shall be strictly

adhered to, within the stipulated time of completion/commissioning.

The contractor shall be responsible for complete installation of sewage

treatment plant as per approved drawings and as per the latest BIS

codes of practice.

Execution of work by the contractor includes complete installation of

equipments, plant internal & external interconnected piping works,

controllers, valves and power control wiring for controller etc.

It is the responsibility of the contractor to protect all the installed plant

equipments until the time of handing over to the EMPLOYER.

The Contractor shall set out the plant in accordance with the Drawings

and instructions of the Engineer. The contractor shall be responsible

for the correctness of the above and any incorrectness shall be

rectified at his own cost. He will be responsible for taking levels at site

before setting out and putting them on record without extra charge.

The contractor shall provide at all times during the progress of the

works and during maintenance period proper facilities and necessary

attendance for inspection or measurement of the works by the

Engineer or their representatives.


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9.0 MANUFACTURERS’ INSTRUCTIONS

Where manufacturers have furnished specific instructions relating to

the materials used in this job and methods of construction that are not

specifically mentioned in these documents, such instructions shall be

followed in all cases. The contractor shall also furnish detailed

instruction and operation manuals in triplicate including detailed

completion drawings on a tracing paper to an approved scale. Further

it is the responsibility of the contractor to train the EMPLOYER's

personnel in the operation and maintenance of the system.

10.0 MATERIALS

Materials shall be of approved make and quality specified. They shall

conform to the respective Bureau of Indian Standards, British

Standards Specifications and supported by Manufacturing Certificate /

test certificate.

Samples of all materials shall be as per the first choice of the list of

approved brand manufacture, the sample of which shall be approved

by the Engineer before placing the order.

In any case of non-availability of materials in metric sizes, the nearest

size of FPS units shall be provided with prior approval of the Engineer

at no extra cost to the Employer.

Colour code shall be used to identify pipe material. The CONTRACTOR

shall be able to identify on request all random piping prior to any field

installation.

As far as possible materials bearing I.S. certification marks shall be

used with the approval of the Engineer.


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Unless otherwise specified and expressly approved in writing by the

Engineer, materials of makes and specifications mentioned in this

document/BOQ shall be used.

The CONTRACTOR shall furnish two (2) copies of certificates for –

Sizes of all fittings, G.A. drawings of pumps and equipments and

Hydrostatic test.

Samples of all materials shall be got approved before placing

order and the approved samples shall be deposited with the

Engineer.

If directed, materials shall be tested in an approved testing

laboratory and the contractor shall produce the test certificate in

original to the Engineer and the entire charges for original as

well as repeated tests shall be borne by the Contractor. If

required by the Engineer, the Contractor shall arrange to test

portions of the work at his own cost in order to prove their

soundness and efficiency. If after any such test the work or

portions of work is found in the opinion of the Engineer, to be

defective or unsound, the Contractor shall pull down and re-do

the same at his own cost. Defective materials shall be removed

from site.

It shall be obligatory for the Contractor to furnish certificates if

demanded by the Engineer from manufactures or materials suppliers

that the work has been carried out by using their material and

installed/fixed as Per their recommendations


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Cement: Cement required for the plumbing work shall be supplied to

the Contractor through the Civil Contractors. However, the contractor

will have to make his own arrangement to lift the cement from the go-

down to the site. Cost of cement issued will be recovered from

contractor.

Cement shall be stored in weather proof shed with raised wooden

plank flooring to prevent deterioration by dampness or intrusion by

foreign matter.

Sand: Sand shall be clean, free from silt, clay, loam, shells, vegetable

matter and shall be approved by the Engineer.

Coarse Aggregate: Shall be angular, tough, sharp and well graded

stone metal, Basalt from approved source.

Bricks: Bricks shall be local best quality obtainable and shall be table

moulded. Well burnt, but not over burnt and shall be free from cracks,

chips, flaws, and stones. It shall not absorb water more than 20% of

its own weight when dry. The crushing strength of bricks shall not be

less than 35 kg./sq.cm.

Cement Concrete: P.C.C shall be of the proportion specified in the

particular item in the schedule of quantities. Sand and Metal shall be

measured in suitable measuring boxes and correct quantity of cement

shall be added. The materials shall be mixed dry on a clean platform.

Clean water is then added, and mixed thoroughly. It shall be

prepared in such quantity as can be readily used up. P.C.C which has


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partially set shall under no circumstances be used and shall be

removed away from the site.

Reinforced Steel: Reinforced steel shall be ribbed torsteel. Steel

required for plumbing work shall be supplied to the Contractor Free of

Cost' through Civil Contractor. However the Contractor shall make his

own arrangements to lift the steel from the go-down to the site.

11.0 PIPE HANGERS, SUPPORTS, CLAMPS, BRACKETS ETC.

GENERAL: Provided proper solid angle iron/channel section, supports for all pipes

complete with clamps. Wherever comes, provided wooden guide to

support pipe on the angle iron hangers/supports. For attachment in

concrete, use Hi-Tech fasteners or anchor plug type inserts of

equipment. Provide hangers with in 900 mm of all changes in direction

of pipes. A minimum of three hangers per expansion band wherever

shown in drawing.

Provided all additional structural steel angles, channels of the members

whether specifically shown or not but are required for proper support.

Where necessary additional hangers to be provided to arrest water

hammers or hydraulic resonance with proper rubber padding.

Space hangers as noted below, except on all soil pipes which shall have

a hanger of multiple fittings.


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Sufficient hangers shall be provided to maintain proper slope without

sagging. In case of angle suspended line, the following is suggested.

Standard sizes of Hanger rods

Sl.No Pipe Sizes Hanger Rod Dia.

1 20mm to 50 mm 6 mm

2 65mm to 125 mm 10 mm

3 60mm and above 15 mm

Standard spacing of supports for pipes.

Sl.No Pipe size Spacing of

supports

1 15mm to 40 mm 1.0 m apart

2 50mm and above 1.5 m apart or as per

IS

Provide floor stands, wall brackets of masonry pillars etc. for all lines

running near the floor or near walls for those lines which cannot be

properly supported or suspended from the walls or floors. Pipe lines

near concrete or masonry walls may be hung also by hangers carried


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from wall brackets at a higher level than pipes. Hanging of any pipe

from another pipe is prohibited.

Band type hangers shall be provided. Hot water piping is to be

provided with suspended supports as far as possible. Note that

straphangers are not permitted and clamps should be of removable

type.

All vertical pipes shall be fixed by M.S. galvanised Clamps truly

vertical.

Inclined pipes running along ceiling shall be fixed on M.S adjustable

hangers of special design as directed. Pipes shall be laid to uniform

slope and the hangers adjusted to the proper levels so that the pipes

fully rest on them.

Structural clamps shall be fabricated from M.S. structural members

e.g. rods, angles, channels, flats as per detailed drawing or as

directed. Contractor shall provide all nuts, bolts, welding and paint the

clamps with two coats of zinc chromate primer and two coats of

approved enamel paint. Wooden saddles shall be provided free of

cost.

Slotted angle/channel supports on walls shall be provided wherever

shown on drawings or as required. Angles/channels shall be fixed to

brick walls and bolts embedded in cement concrete blocks and to RCC

walls with suitable anchor fasteners. Holes required in RCC walls shall

be neatly drilled by electric drills and no manual chiselling will be

allowed. The spacing of supports horizontally shall not exceed 1.8 M.

Wherever M.S. clamps are required to be anchored directly to brick

walls, concrete slabs, beams or columns, nothing extra shall be

payable for clamping arrangement and for making good with cement

concrete 1:2:4 as directed by the Engineer.


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12.0 INSERTS AND SLEEVES Layout work in advance of placing of concrete slabs or construction of

walls, furnish and set inserts and sleeves necessary to complete the

work. Cost of cutting or patching made necessary as a result of this

operation shall be at no expense to the Employer Opening shall be as

per structural Engineers approval.

13.0 SITE FACILITIES An open area shall be made on the plot to enable the contractor to put

up the site office and store at his own cost.

Water supply will be provided by EMPLOYER at one point during the

construction period and the necessary piping shall be done by the

contractor to the required point at his own cost.

Electric power supply will be provided at by the EMPLOYER at one

point. The contractor can use the electricity on chargeable basis by

providing a energy meter at his own cost.

14.0 DETAILS OF ELECTRICAL WORKS

The electrical works for STP is comprising of supply of STP panel with

required incomer and outgoing feeder to drive all the motors of the

system with each type as spare feeder. The starter shall be of Type-2

co-ordination. The STP panel shall be provided with voltmeter,

ammeter and energy meter. The client shall make arrangement for

incoming power supply only. In addition industrial sockets of 63A shall

be provided within the pumproom and one outside the STP ( outdoor

type) for maintenance purpose. Required feeder for the above shall be

provided in the STP panel. Earthing as per IS-3043 for the systems

cable trays and lighting ( outdoor and Indoor) shall be provided. The


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STP shall be integrated with level switches of the respective tanks for

auto ON/OFF. Auto/ Manual switch shall also be provided for each

starter. All cables from STP-panel to various pumps, sockets, lighting (

external and internal) are to be covered by STP contractor.

15.0 TEST/TRIAL RUNNING AND COMMISSIONING

The Contractor shall have to test each equipment used for the plant for

atleast 72 hours continuous running with designed load and to the full

satisfaction of Engineers. Any defects found, has to be rectified by the

contractor at his own cost immediately and within reasonable time to

be decided by client.

Necessary Instruments, Gauges, Labour/Supervisory Staff,

Laboratory analysis etc., are to be furnished/provided by the

Contractor free of any cost to client.

16.0 COMMISSIONING/HANDING OVER

During trial runs as described above, the Contractor shall satisfy

Engineer in all respects regarding the satisfactory quality of effluent,

quality of materials, equipments and workmanship used in the plant.

Only after satisfying itself/ himself regarding the above points, client

will takeover the plant and such date of taking over shall be deemed

as date of commissioning for all purposes, guarantees, and payment

terms mentioned elsewhere in this tender. The guarantee period

described elsewhere in the tender shall start from the date of

commissioning.


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17.0 (i) GUARANTEE

The under mentioned clauses shall govern in case of any contrary

provisions given elsewhere in the document.

Manufacturer's Guarantees

The manufacturer's guarantee for design, workmanship and

performance for all bought out items shall be made available to the

owner and shall be valid atleast for the entire defects liability period.

In the event of failure of any particular equipment which fails more

than three items during the guarantee period as mentioned in clause

below, the contractor shall replace at his own cost that equipment.

Manufacturer's/Contractor's guarantee, as mentioned in clause

above,for such replaced equipment shall also be made available to

the Owner and should be kept atleast for one year from the date of

last replacement.

(ii) Performance Guarantee

The Contractor shall give guarantee for a period of one year from the

date of successful commissioning of the treatment plant against

design, defective materials, workmanship, performance and

guaranteed effluent quality. In the event the commissioning of the

plant is not possible due to non-availability of effluent, contractor shall

be issued mechanical completion certificate by client/Engineer

provided each equipment is tested satisfactorily as directed by

Engineer. However, the contractor shall have to maintain the plant at


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his own cost, in such a case for a period for three months beyond

which period, if he is required to maintain further, he will be paid extra

at mutually agreeable rate. However, testing and commissioning of

the plant shall be carried out by the Contractor during the Defects

Liability Period. Any defects found in the workmanship, materials or

performance of the plant shall be made good by the Contractor at

his own expense within the time specified by client/Engineer.

For this purpose, the retention amount will be as follows:

10% of the total value of Contract shall be retained and also treated as

performance guarantee. The Successful Tenderer as per general

conditions of contract shall be retained till the completion of

satisfactory commissioning as stated above. The contractor at his own

expense shall start and commission, the plant and prove that it is

giving satisfactory service and desired characteristic of the treated

effluent, for two months before handing over the plant to the Owner.

During this, the contractor shall train the Owner’s operational stall

without any extra cost to the Owner. The Contractor shall also have to

guarantee the quality of the treated final effluent to meet the

specification mentioned already. In case the quality of treated effluent

varies from what is required, the contractor shall rectify the plant at no

extra cost so as to achieve the requisite performance guarantee and

satisfactory commissioning of the plant to the client/Engineer. In Case

the contractor fails to achieve any of the aforesaid guarantees he will

be penalised by an amount upto 10% (ten percent) of the total

contract value. For this purpose any money due to the contractor shall

be forfeited and adjusted against such penalty.


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The contractor shall furnish the figures for average daily consumption

of nutrients / Chemicals, if any.

All the above guarantees will be based on collection and analysis of

samples as mentioned in clause below.

Oxygenation Capacity of Diffusers.

The contractor, if directed by Engineer, shall at his own cost prove the

Oxygenation capacity guaranteed by him for the diffusers provided by

conducting Oxygenation capacity tests on the unit by any standard and

internationally recognized method to be approved by the Engineers.

18.0 MECHANICAL GUARANTEES

The Contractor shall guarantee for a period of one year for the failure

of any particular part of the equipment. In the event of failure of any

particular part of the equipment more than three times during the

guarantee period, it shall be replaced by the Contractor. In case it is

found that the above mentioned failure is due to some other connected

part of the equipment, that part shall also be rectified or replaced by

the contractor to avoid such failures in the future. The guarantee

for such replaced parts shall be extended by one year from the date

of last replacement.

19.0 COLLECTION AND ANALYSIS OF SAMPLES

The guaranteed effluent shall be based on complete analysis of

samples collected after stabilization of the plant.


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20.0 ANNUAL MAINTAINANCE

The contractor shall quote separately for comprehensive Annual

Maintenance Contract (including all consumables and labour) for full

Three (03) years period after the Defect Liability Period (DLP). The

contractor shall bear the full responsibility for all kinds of maintenance

that includes periodic maintenance and all the consumables etc.,

Qualified personnel shall be posted on the site on shift basis, to take

the sampling and carryout the tests. A complete record has to be

maintained for all the tests carried out at regular intervals.

One operator per shift and one supervisor during general shift based

on 2 shifts/day shall be posted. The senior chemist of the contracting

firm shall visit atleast once a week for monitoring plant operation.

Min. 2 nos. Raw Effluent and 2 nos. Treated Effluent samples per

month shall be collected and got analyzed at the Board approved

Laboratory. Also one Senior Mechanical Technician shall visit the plant

for inspection and supervision of maintenance of all equipments.

21.0 DATA SHEET

Filters

Material

Capacity FRP

Design flow 10 cum/hr

Size of inlet/ Outlet


33

Type of vessel Vertical

Dia of vessel

Design Pressure

Height

Dished end thickness

Shell thickness

Corrosion allowance

Dia of man way

Internal protection Epoxy coating

External protection Epoxy coating

Filtering Media

Material Cum vol Layer Thickness Size Uniformity

Co-

efficient


34

Valves to be supplied by the filter supplier shall be furnished in the

following table:

Chemical dosing unit with metering pump tank

Capacity in litre : 100 litre

Diameter :

Height :

Sl.No Dia Type Make Number Material Applicable

code


35

Design flow :

Chemicals required at :

Holding period :

Dia of inlet :

Dia of outlet :

Dia of drain :

Material of construction

Tanks :

Valves :

Piping :

Metering Pump

Make :

Model No :

Construction detail :

Duty conditions :

Accessories included

with pump :

NOTE:

1) All information to be filled by supplier


36

2) This data sheet to be filled for each unit separately

Raw Pump

Make :

Type :

Flow rate : As per BOQ

Material :

Casing :

Impeller :

Seal :

Motor Electrical Supply : 400/440v, 50 hz, 3 phase

RPM :

Enclosure :

Class of Induction :

Return Sludge pumps

Make :

Type :


Material :

Casing :


37

Impeller :

Seal :


RPM :

Enclosure :


Filter feed pumps

Make :

Type :


Material :

Casing :

Impeller :

Seal :


RPM :

Enclosure :


ANNEXURE-A


38

Project Building Client Contractor NON tendered Iten no: Reference drg. No Issued by Revision no: Dated Location Unit Rate claiming Appx. Quantity

Detailes Specification

Why Non Tendered item

Orally In writing Date

Authorized by

Status of Non Tendered item

a) Executed quantity

b) Work in progress

Quantity executed


39

Balance Quantity

c) To be executed

Approximate Quantity

Contractors Signature

LIST OF RECOMMENDED MAKES

SEWAGE TREATMENT PLANT

1a I. Galvanised Pipes 1 Tata 2 Jindal

1b ii GI fittings 1 R Brand (ISI) 3 Unik

2 Zoloto

1c CPVC pipes 1 2

Astral Ashirvad

3 Ajay

1d CPVC fittings 1 2

Astral Ashirvad

3 Ajay

2 Gate valves/Non-return

1 Leader 3 Audco

Valves 2 Zoloto

3 Butterfly valves 1 Inter Valve 3 Audco

2 Leader

4 Foot valves 1 Leader 3 Audco


40

2 Zoloto

5 Pumps 1 As mentioned in technical specification

6 ACB/MCCB/SFU/LBS

1 Merlin Gerin/ 3 Siemens

2 ABB

7 Contactors/ ORLS 1 Tele Mechanique 3 Siemens

2 ABB

8 MCB/ELCB 1 Merlin Gerin 2 MDS

3 Indo Asia

9 MCB DB 1 Merlin Gerin 3 Indo Asia

2 MDS

10 Digital Meters 1 AE 2 MECO

3 ENERCON

11 Kwh/MDM/MDC Meters

1 AE 2 ENERCON

3 L & T

12 LED Indicating Lamps/ PBS

1 TEKNIC 2 VAISHNO

3 Siemens

13 SELECTOR Switches

1 KAYCEE 2 SALZER

14 LIGHT Fixtures & Motion Detectors

1 Philips 2 Wipro

15 Switches/ Sockets( MODULAR) outlets in metal boxes

1 Anchor Roma 2 MDS Mosaic

16 Manhole PVC steps 1 Southern Concrete Industries

2 Approved Equivalent

17 CI manhole frame & 1 Neco 2 Bengal iron castings


41

Cover

18 PVC pressure pipes 1 Astral

(schedule 40) & fittings

2 Supreme

19 Water meters 1 Dash - Mesh 3 Anand Asahi

2 BHEL 4 Capstan

20 Y Strainer 1 Zoloto 3 Audco

2 Leader

21

Motors

1

NGEF

2 Crompton Greaves 3 Siemens

Documents

GENERAL CONDITIONS OF CONTRACT specs for STP -9-9-16.pdfcommissioning and running of the STP for its commercial utilisation is also to be included in the scope of contract, such items