district panchayat 2022-23 supply, installation, trial run and commissioning of submersible vertical axial flow pumpsets in kottayam supply, installation, trial run and commissioning of submersible vertical axial flow pumpsets in kottayam , supply, installation, testing, trial run and commissioning of submersible vertical axial flow pumpsets with the specifications listed below, suitable for handling brackish and silty water with small solid particles, with rpm 960 (syn) or less. the material of construction of the casing, suction bell shall be cifg 260 with 2% nici, impeller ss 316, shaft and sleeve should be ss 316 and vertical submerged column pipe, and delivery pipe (varies from 2 to 10 m length as per site conditions) ) of ss304 with 4mm thickness with suitable support system. a non-corrosive metallic strainer of mesh size not more than 50 mmx 50 mm should be fitted at mouth of suction column. any hanging portion of the delivery pipe should be supported with suitable metallic supporting frames. the prime mover for the pump should be 3 phase tewc squirrel cage submersible induction motor suitable for 415 v +/- 10%, 50 hz +/- 5% connection with class “f” insulation, cubicle type panel board with all necessary protection units and instrumentation. auto transformer starter of reputed make, mccb including suitable metering, led indications, selector switch, single phase and dry running preventer, suitable capacitor etc., wiring and earthing should be as per regulations and specifications of kseb and electrical inspectorate. suitable water proof, copper power cable, about 20.00 m length or as per site requirement. a screen with 6 mm gi welded mesh with 50 mm x 50 mm opening size, (about 20 sqm area) framed in gi angles and gi tubes shall be fitted at the openings on top and sides of sump to prevent entry of unwanted materials to the pump through inflow water. but excluding gst , minimum discharge atduty point head (lps): 570 duty point head (m): 3.0 working head range (m): 0.5-3.5 available power allocation (hp): 50 overall efficiency at duty point head (%): 70