tender for supply and fixing of 35 h.p. submersible centrifugal sewage non clog motor pump and starter at sewage treatment plant (treated sump) in periyakulam municipality , supply and delivery of submersible centrifugal sewage non-clog pumps, vertical spindle type pump , wear resistance with submersible motor for the various duty conditions. pump shall be capable of handling min 100 mm solid size with sewage specific gravity of up to 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 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 should 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 9600 rpm for high duty pumps and 960/1450 rpm for low duty pumpsets. casing and impeller should be of ci gr. fg 260:is210 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 3ph, 415 v(+or- 10%), 50hz(+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% o