Construction of Gravel Packed Production Tube Well at Poshpathri Khonmoh.

Amount

PART "B" (GRAVEL PACKED) 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 Heavy duty MS Casing pipe confirming to Relevant IS Codes with time to time amendments and the slotted / strainer pipes also confirming to Relevant IS Codes at the site of well Construction of well. The welding electrodes used for welding the casing pipes together are super bond / Esab /L&T only. The jigs and fixtures for lowering the casing pipe are provided by the firm. Min dia of Casing Pipe……..250 mm dia (for GRAVEL PACKED) The material MS Pipe shall be provided by the department

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 pack used as pack in tube well is specified in Relevant IS Codes. (Quantity shall be subject to the actual measurements at site)

The well is to be developed using compressed air from an Air Compressor of adequate capacity and pressure rating. As the water becomes clear, surging or backwashing is done to make the development more perfect. The final discharge should be free from sand. The physic-chemical analysis of water sample tested has to be as per the specified IS Codes. After completion of development the well is tested for its performance that is yield characteristics and efficiency. The water has to be disinfected after completion of test for yield to ensure that the quality of water and as laid down as per specified IS Standards. The grouting and sealing of tube well has to be done to ensure safe sanitary conditions. An apron around the well (mix of M 10 grade) and slopping away from it to protect the well from pollution to be constructed to prevent contaminated water flowing back into it. The casing pipe has to be anchored within the apron by welding ISMC 150 steel bracing with cleats and sufficient welding area 2 meters length each bracing embedded within the apron (4 bracings). The complete well thus completed handed over to the territorial Mechanical Division for harnessing. The job includes P/F of bail plug as per site requirements. 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.

MS SAHARA BOREWELLS