PUBLIC HEALTH ENGINEERING DEPARTMENT

As Per Boq - Drilling Of Gravel Packed Bore Hole Of 250mm Diameter And Lowering Of Liner Assembly Consisting Of Blind And Strainer Pipes Of 125mm Dia. Upto 90 Mtr By Using Direct/ Rotary / Dual Rotary Method Including Installation Of Mark-ii Hand Pump And Construction Of Platform As Per Unicef Norms / As Per Site Conditions, Providing Of 125 Mm Dia. M.s. Casing Pipe. The 125mm Dia. M.s. Casing Pipe Isi Marked Should Have Thickness Of 5.4mm Conforming To As Per Is 4270 / 2001 Medium Class (part-i) 2004 (heavy C Class) Electric Resistance Welded Beveled Ended Inside Beed Free Pipes. All Pipes From Inside And Outside To Be Provided With Two Coats Of Anti-corrosive Paint Of Superior/approved Quality. There Should Be No Circumferential Weld. The Pipe From Inside Should Be Beed Free Having Smooth Finish. Each Pipe Shall Have Subjected To Hydraulic Pressure Test At The Manufacturer Works In Accordance With Is 4270/2001 With Latest Amendments. All The Physical And Chemical Properties Of Pipe Including Tensile Strength Should Be In Accordance With Is 4270/2001 With Latest Amendments., Providing Of Pea Shaped Gravel As Per Is-4097 Of 1967 With Latest Amendments For Gravel Packing Of Hand Pump, Shrouding During Lowering Of Liner Assembly, Cost Of Slotting Of Ms Pipe 125 Mm Dia ( To Be Charged As Per Actual), Development Of Bore Hole By Air Compressor Of Adequate Capacity To Give Clear Water Free From Sand And Impurities, Providing, Fitting, Installation, Testing And Commissioning Of Submersible Pump Set (reputed Make) Of Suitable Parameters Depending Upon The Depth And Discharge Of The Bore Hole. The Job Includes Erection Of Tripod Stand And Fixing Of Chain Pulley Block. Then Lowering Of Submersible Pump Set In To The Bore Hole By Way Of Providing And Lowering Of 32 Mm Dia. Hdpe Pipe, Submersible Cable With Fixtures Such As Rope, Clamp, Nuts, Bolts & Washers. Fabrication And Fitting Of Well Cap.