retender supply, installation, testing, trial run and commissioning of 1 number of 25 hp submersible dewatering pump for manjanakulam padasekharam, pathanamthitta district , supply, installation, testing and commissioning of submersible close coupled pump set with the specification listed below, suitable for handling silty water with small salt particles with rpm 960 (syn) or less. the material of construction of the casing, suction bell shall be cifg 260 with 2% nickel, impeller ss316, shaft and sleeve should be ss 316, the suction (in the case of tubular column casing pumps) and delivery pipe length shall be (varies from 2 to 10 m length as per site conditions) of ss304 with 6mm minimum thickness and of suitable diameter to carry the flow properly. discharge pipe outlet should be fitted with a spring-loaded lid with opening and closure arrangements. all the piping, welds, joints etc should be done properly with good craftsmanship. the prime mover for the pump should be 3 phase tewc squirrel cage submersible induction motor suitable for 415v +/- 10%, 50 hz +/- 5% connection with class f insulation, cubicle type ats / fully automatic star-delta starter panel board with all necessary protection units and instrumentation. starter of reputed make, including mccb, rccb, elcb of suitable metering, led indications, selector switch, single phase and dry run protection wiring and earthing as per regulations and specifications ofkseb and electrical inspectorate. suitable waterproof, copper power cable minimum 20m length or as per site requirement should be provided. all the electrical connections and laying out of cables and wires should be done using suitable external conduits neatly fixed on the wall. gi weld mesh made of 6 mm thick with metallic strainer of mesh size not more than 50mm x 50mm should be fitted at pump inlet and top of the sump to prevent entry of unwanted material to the pump through inflow water. any hanging portion of the pipe should be supported with su