Supply, delivery and commissioning of submersible non clog pumps for a duty point 20m head and discharge of 100cum per hr at Main pumping station, Kuruchikuppam, Puducherry.

Amount

Supply and delivery of submersible centrifugal sewage non-clog pumps, (approved make of KISHORE/KSB/AQUA/GRUNDFOS/equivalent) vertical spindle type pump, wear resistance with submersible motor for the various duty conditions as stated below, pump shall be capable of handling min lOOmm solid size with sewage specific gravity of upto 1.05. Pump shall be of robust construction. 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 sillicon 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 rpm 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 continously. 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 otherwise 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 compatible 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 suitably 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 sq.mm copper conductor and for bimetallic switches 2 core x 1.5 sqmm copper conductor shall be provided. Motor shall be supplied with lOmtrs of round submersible copper cable of suitable size. For a duty point of 20 m head and Discharge of 100 Cum/hour.

Earth work excavation above water level and depositing on bank in sandy silt or other soil, wet sand or silt, light black cotton soil or clay, sandy loam & ordinary soil for I.C's man hole, well, infiltration, suction well including driving shoring materials etc. for excavation purpose and removing the shoring materials and refilling the trenches with excavated earth complying with standard specification., complete - For first depth of 2 metres (using close timbering).

Labour for cutting C.I. pipe with steel saw:- 100 mm diameter C.I. pipe.

Providing and fixing D.I. MJ collar coupling , with bolts, nuts, rubber insertion etc.,complete - 100 mm dia.

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) -100mm dia.

Providing and laying DI specials of class K-12 suitable for push on jointing as per IS 9523 upto 600mm dia.

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) - 100 mm dia.

Threading of CI / DI pipes suitable for fixing flanges including transportation,labour charges etc.,complete - 100 mm dia.

Providing flanged joints to double flanged C.I./D.I. pipes and specials including necessary bolts, nuts, rubber insertion and testing of joints etc.,complete - 100mm diameter pipe.

Providing and fixing C.I. sluice valve (PN 1) (with cap) conforming to IS 14846 and ISI marked, with bolts, nuts, rubber insertion etc.,complete (the tail pieces if required will be paid separately) - 100 mm dia.

Power Spares Engineering

VENKATASALAM