Providing pumping arrangement at Uppar Drain for treating waste water of Uppar Drain at STP, Dubrayapet, Puducherry

Amount

Supply and delivery of submersible centrifugal sewage non clog pumps, vertical spindle type pump, wear resistance with submersible motor for the various duty conditions as stated in the annexure, pump shall be capable of handling min 100 mm solid size with sewage specific gravity of upto 1.05. Pump shall be of robust constructions. Liquid passages shall be finished smooth and designed as to allow free passage to solids. Pump impeller should be of non clog semi open type, single vane. multi vane preferably contra bloc or vortex impeller design. Double mechanical seal with silicon carbide faces should be provided to protect the motor from ingress of sewage along the shaft. The critical speed of the rotor shall be at least 30% above the operating speed. Pumps to have double bearings between the pump & motor. The bearings life shall be minimum 100,000 hrs of operation with greased for life. Pump should be provided with automatic coupling device including pedestal, duck foot bend, stainless steel guide pipe or related accessories of suitable size to facilitate lifting and lowering into guide rails for easy maintenance. Pump shall be provided with a stainless steel lifting chain conforming to BS 970 Gr 304. Pump speed shall be of 960 for high duty pumps and 960/1450 rpm for low duty pumpsets. Casing and impeller should be of CI Gr.FG 260: IS 210 more preferably with hardened impeller. Shaft should be of

stainless steel AISI 410. All the fasteners and bolts shall be of AISI 410. The submersible motor shall be operated with 3 ph, 415 v (+or -10%), 50 Hz (+ or – 5%) dry induction type. Motor shall be capable of giving rated output without reduction in the expected life span when operated continuously. The rotating assembly shall be dynamically balanced as per standards. The starting current of the motor shall not exceed 200% of rated full load current for star / delta or ATS starting under any circumstances. The motor shall be suitable for full voltage star delta /ATS starting. The locked rotor current of the motor shall not exceed 600% of full load current unless other wise specified. Motor shall be designed to withstand 120% of rated speed for two minutes without any mechanical damage, in either direction of rotation. The motor vibration shall be within the limit specified in applicable standards. Motor should be of IE2, explosion proof com partible for VFD operation together with Star- Delta/ATS starter, protection against increase in stator winding temperature (15 deg Celsius), bearing temperature, leakage in the stator housing and terminal box shall be provided and to be suitable interlocked with the control panel for tripping the pump in case of increase in temperature beyond set limit. Insulation class shall be of “Class H” and degree of protection shall be of IP 68 as per IS 4691.

Motor shall be suitable for continuous operation in fully submerged or partially submerged condition. The pumpset shall be supplied with power cable of PVC insulated and PVC sheathed, copper, flexible, round type with required conductor size and number of cores as per starting method and of specified length for continuous use under water and air. The control cable of PVC insulated, PVC sheathed, flexible for stator winding temperature sensor 3 core x 1.5 sqmm copper conductor and for bimetallic switches 2 core x 1.5 sqmm copper conductor shall be provided. Motor shall be supplied with 10 mtrs of round submersible copper cable of suitable size. 10m to 15 m head and discharge of 300 – 400 cum/hr Collection well at Uppar drain.

ELECTRICAL WORKS

Supplying of 3.5/ 4x25 sqmm underground cable (Paragon/ suncab/Empire) complete - upto 25HP pumpset.

Supplying of 3.5/ 4x50 sqmm under ground cable (Paragon/suncab/Empire) complete - suitable for (30 HP to 40 HP pumpset) (upto 40 KVA Genset)

Laying of under ground cable direct in ground including mud road cutting,excavation of earth, sand cushion, brick protection, back filling etc., complete. - upto 50 sqmm.

Making earth pit of G.I. pipe for earthing in earth pit with 40mm dia. G.I. pipe medium class of length 3.05m perforated with 46 Nos of 12mm dia. holes, pipe lowered in bore holes of 150mm dia. and filled in with charcoal and salt in alternative layer of 300mm, the top of G.I. pipe shall be clamped. Earth pit shall be provided with 60cm dia precast ring with 60cm depth alround, covered with R.C.C. precast slab etc. as per I.E. standards.

Supplying and fixing of copper flat (25 x 3mm) for earthing arrangements including bolts and nuts etc.

Supplying and laying of 1.5 sqmm cable

Providing and fixing of 200 A four pole change over switch.

COLLECTION WELL

Sinking well below water level including all incidental charges using special tools and plants such as air compressor, helmet etc., compelte and including bailing and pumping of water in Silt (or) clay pocket – For 2 m dia (internal) – First depth of 2m.

Sinking well below water level including all incidental charges using special tools and plants such as air compressor, helmet etc., complete and including bailing and pumping of water in Silt (or) clay pocket – For 2m dia (internal) – Second depth of 2m.

Sinking well below water level including all incidental charges using special tools and plants such as air compressor, helmet etc., complete and including bailing and pumping of water in Silt (or) clay pocket – For 2m dia (internal) – Third depth of 2m.

Providing and laying in position cement concrete of specified grade excluding the cost of centering and shuttering.- All work upto plinth level -1:2:4 (1 cement:2coarse sand : 4 graded stone aggregate 20mm nominal size).

Reinforced cement concrete work in walls (any thickness), including attached pilasters , buttresses, plinth and string courses , fillets, columns , pillars, piers, abutments, posts and struts etc.upto floor five level excluding cost of centering, shuttering,finishing and reinforcement:1:1.5:3 (1 cement : 1.5coarse sand : 3 graded stone aggregate 20mm nominal size)

Centring and shuttering including strutting, propping etc. and removal of form for: Walls (any thickness) including attached pilasters, buttresses, plinth and string courses etc.- Using steel sheet with M.S.frames.

Reinforcement for R.C.C work including straightening , cutting , bending , placing in position and binding all complete - Thermo - Mechanically treated bars (TISCON / VIZAG / IISCO /SAIL / JSW) including placing the M30 grade Athees make cover block @ 60cm centre to centre.

Steel work welded in built up section/ framed work including cutting hoisting,fixing in position and applying a priming coat of approved steel primer using structural steel etc. as required. In grating, frames, guard bar, ladder, railings, brackets, gates and similar works.

Fixing of 150 mm wide PVC encapsulated steps in the manholes with 200 x 200 x 100 mm CC block in cement concrete 1:1.5:3 (one cement, one and half sand and three hard broken granite stone aggregate of 20 mm nominal size) all as shown in drawings.

Supplying and fixing of steel grill work of M.S. angles, flats, squares and pipes including cost of welding charges, fixing in position in masonry walls with cement concrete 1:2:4 (one cement, two course sand and 4 graded 12.5 mm nominal size) including one coat of priming coat etc, complete.

Finishing with epoxy paint (two or more coats) at all locations prepared and applied as per manufacturer specifications including appropriate priming coat, preparation of surface, etc. complete - On Steel work.

PUMPING MAIN

Providing and laying Ductile Iron Double flanged pipes of class K9 (Electro steel/Lanco/Jindal/Electrotherm) conforming to IS specification 8329/2000 and ISI marked suitable for flanged joints in good condition including transportation of D.I.pipe from production centre/company to the site at Puducherry, lowering to the trenches(or fixing in over head tanks above ground level) laying to proper grade and alignment, testing of joints with required testing equipment etc.,complete all as per IS12288 and CPWD specification . (earth work and jointing of pipes with rubber insertion will be paid separately) -150mm dia.

Providing and fixing in position flanged standard D.I. specials (Electro steel/Lanco/Jindal/Kiswok) such as tees, bends, collors, tapers, caps etc.conforming to IS specification 9523/2000 and ISI marked - 100 to 300mm dia.

Providing flanged joints to double flanged C.I/D.I.Pipes and specials including testing of joints : 150 mm diameter pipe.

Providing and fixing D.I. MJ collar coupling, with bolts, nuts, rubber insertion etc.,complete - 150 mm dia.

Supplying and placing in position HDPE cement bags filled with sand for breach closing / diversion arrangement. The cost includes the cost of empty HDPE bags, labour charges for filling the bags and placing in position, removing the bags from site after completing the work etc., complete.

Providing and fixing C.I. Ball type non return valve (PN 1) conforming to IS 318 & IS 1363, with bolts, nuts, rubber insertion etc.,complete (the tail pieces if required will be paid separately) - 150 mm dia.

Providing and fixing CI sluice valves (with cap) complete with bolts, nuts, rubber insertion etc (the tail pieces if required will be paid separately) 150mm diameter Class I

VENKATASALAM