Public Health Engineering Department Tender

Gravel packing in tube well construction in accordance with IS:4097, including providing gravel fine/medium/coarse in required grading and sizes as per actual requirement all complete as per direction of Engineer in-charge

Supplying, assembling, lowering and fixing in vertical position in bore well, ERW (Electric resistance welded) Fe 410 mild steel, screwed and socketed/plain ended casing pipes of 250 mm dia, wall thiekness of 7.1mm, conforming to 1S: 4270 of reputed and approved make, including painted with outside surface with two coats of anticorrosive paint of approved brand and manufacture including required hire and labour charges, fitting and accessories, all complete for all depths as per direction of Engineer-in-charge. Pipe specificaiton nominal size 250 mm nominal dia 7.1 mm, with allowable tolerance. (The length of the casing pipe may increase or decrease at the time of execution of work as per approved casing diagram).

Supplying, assembling, lowering and fixing in vertical position in bore well, ERW (Electric resistance welded) Fe 410 plain slotted (having slot size 1.6/3.2 mm) mild steel threaded and socketed/plain bevel ended pipes (type A) of required dia, conforming to IS:8110 of reputed and including painted with outside surface with two coats of anticorrosive bitumestic paint of approved brand and manufacture including required hire and labour charges, fitting and accessories, all complete for all depths as per direction of Engineer-in-charge. Pipe specificaiton nominal size 250 mm nominal dia 7.1 mm, with allowable tolerance. (The length of the casing pipe may increase or decrease at the time of execution of work as per approved casing diagram).

Development of tube well in accordance with IS: 2800 (Part 1) and IS: 11189 to establish maximum rate of usable water yield without sand content (beyond permissible limit) with required capacity air compressor, running the compressor for required time till well is fully developed, measuring yield of well by V-Notch method or any other approved method, measuring static level and draw down etc. by step draw down method, collecting water samples and getting tested in approved laboratory I/C disinfection of tube well all complete including required hire and labour charges of air compressor, tools and accessories etc all as per direction of Engineer in-charge. The grouting and sealing of tube well has to be done to ensure safe sanitary conditions. The well casing shall be anchored with ISMC-150 and CC-Block. The CC-Block shall be laid of size (2x2x1) Meter in M-15 Mix, excluding the annular dia of the well and sloping away from it to prevent contaminated water flowing back into it. The casing pipe has to be anchored by weling ISMC-150 steel bracing of 2-meter length each (04 no. bracings or channels) with cleats and sufficient welding area, bracing embedded with the CC-Block as per the directions of the site Engineer.