Construction of Production Tube Well W.S.S Muchpona District Pulwama.

Amount

Artificial Gravel Packed Production Well: Construction of production well based on results of exploration data by a suitable method of drilling viz Direct circulation method / Reverse circulation method up to the desired depth as per the relevant IS codes of practice for construction and testing of tube wells / Bore wells, with time to time amendments in all kinds of soils , Boulders , Rocks , Collapsible strata , saturated soils etc with the requisite accessories required there of including Bentonite mud , foam , water Lubricants etc. The drilled bore hole is reamed up for open drilling and completed to the desired depth. Dia of Well …….. ≥ 500/550 mm

Lowering of departmentally supplied well assembly i.e the screen and blind M.S pipes of 300/250mm diameter. As per the drawing issued by the site Engineers in accordance with the soil strata and the departmental requirement. (Screen/casing pipes shall be provided by the department FOR stores). The job includes the cost of face to face welding of casing assembly along the beveled edges/areas and strengthening of welding joints by additional ribs/supports to ensure the stout welding joint. The job includes the cost of pointed bail plug required to be fabricated and fitted at the bottom of the well assembly.

The annular space between the casing pipe and the well surface has to be filled with a gravel pack to act as a filter medium. The gravel, to be used in tube well, is specified in Relevant IS Codes. (Quantity shall be subject to the actual measurements at site)

Development of tube well with back wash method with Air Compressor of minimum capacity 1000CFM (300 PSI air delivery system) with pumping pipe of minimum 100 mm dia. and air line of minimum 65 mm dia till well is thoroughly developed as per clause 4.2 of IS 11189 code 1985 with up to date amendments if any complete in all respects as per the direction of the Engineer in charge, for a minimum period of at least 40 hours. b) Development of tube well be continuous over pumping method with the submersible pump of suitable capacity not less than double the discharge established by the compressor. free of all sediments as per IS 11189 code 1985 with up to date amendments if any, for a minimum period of at least 30 hours. the draw down and the discharge to be established by running the pump continuously for 8houres in presence of the officer of the department not less than the rank of AEE. The complete well thus constructed is to be handed over to the territorial mechanical division for harnessing. Completion of test for yield to ensure that the quality of water is as laid down in IS-10500; 1983. the grouting & sealing of the tube well needs to be done to ensure safe sanitary conditions as per IS-2800; 1991. An apron around the well (mix shall be M10 grade) & slopping away from it to protect the well from pollution has to be constructed to prevent contaminated water flowing back into it. the casing pipe is to be anchored within the apron by welding ISMC-150 steel bracing with crates & sufficient welding area 2 mtr length each bracing embedded within the apron (4 bracing). the complete well thus constructed is to be handed over to the territorial mechanical division for harnessing. i. Apron Size= 2.5 mtr × 2.5 mtr. ii. Apron depth at skirt = 300 mm. iii. Apron depth at well casing= 350 mm.

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