Construction of Gravel Packed Production Tube Well at Achan Pulwama

Amount

Construction of production well at proposed site by method of drilling viz Direct circulation method / Reverse circulation method up to the desired depth as per the relevant IS codes 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. Technical Features of Bore Well. Depth of Well ……. < 120 M Dia of Well …….. ≥ 500/550 mm

Lowering of Heavy duty MS Casing 250/300 mm dia pipe. The job includes welding of the pipe joints by using super bond / Esab /L&T welding electrodes only. The jigs and fixtures for lowering the casing pipe are provided by the firm. Fabricating of Bail Plug/ Bottom Plug of required dia at the bottom of the Pipe assly of the well as per IS: 2800 (Part I) is included in the Job.

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 as pack in tube well is specified as per ISO 4097. (Quantity shall be subject to the actual measurements at site)

Development of tube well shall be done in accordance with IS: 2800 Part Ist, IS: 11189 to establish usable water yield without sand content with required capcity of Air Compressor. Running the compressor of required capacity till the well is fully developed. After completion of development the well is tested for its performance that is yield characteristics. The Water is disinfected after completion of test for yield to ensure that the quality of water is as laid down as per specified IS Standards. Measuring of yield by V-Notch method or any other approved method. Job includes measuring of Static and Draw Down Levels of the well. The grouting and sealing of tube has to be done to ensure safe sanitary conditions. An apron around the well (mix of M 10 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 has to be anchored with the apron by welding ISMC-150 steel bracing with cleats & 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. Technical Specifications; Minimum Run for Compressor ……. 40 Hrs Yield Test for Water (till desired results) … Min 30 Hrs i. Apron Size= 2.5 mtr × 2.5 mtr. ii. Apron depth at skirt = 300 mm. iii. Apron depth at well casing= 350 mm.

ZAKIR BOREWELLS