WBBCWD/141/PO-APD/2026-27_SL No-01

Labour for boring through any type of soil for sinking tube well of required dia. with top enlargement by rig boring system (either by reserve circulation or by direct rotary method) including hire charges and labour for rig machine, tools and plants, staging, force pumping set and making arrangement for water required for boring etc. complete and lowering of pipes, strainers, blind pipes etc. complete. (a) For depth upto 250 metre for 100 mm dia. Tube well with top enlargement of 200 mm dia.(upto 50 metre). (i) First 50 metre.

(ii) Next 50 metre

Supplying, fibre glass reinforced Epoxy resin slotted of 1 mm slot width in 6.1 m length of approved make and as per direction of the Engineer-in Charge. (a) 100 mm nominal dia, (i) 6.00 mm wall thickness.

Supplying, fitting and fixing heavy type bell mouth reducing socket. (i) 50 mm X 100 mm.

Supplying M.S. male / female adopter of approved make and brand for coupling of M.S. pipe and fibre glass strainers, as per direction of the Engineer - in - Charge. (i) 100 mm.

Supplying, fittingand fixing 300 mm M.S. housing clamp of approved quality.

Providing 200 mm centre guide. i) With Clamp

Sypply of E.R.W.M.S. (Electrical Resistant Welded M.S.) black pipe of TATA make (heavy quality) as per standard specification, 5 mm thick. (i) 100 mm dia. (internal).

Packing the annular space between the outside of the tube well pipes & strainers and the bore with pea size washed gravel of approved quality having size from 2 mm to 5 mm or the size approved by the Engineer-in charge including cost of all materials labour and equipment complete.

Packing annular space between the outside of the housing pipe and the bore with puddled clay balls of approved size as per direction of the Engineer-in-charge with cost of all materials and labour complete.