Strengthening/repairs to the 750 mm diameter M.S rising main at Lift Irrigation Scheme Seer.

Amount

Strengthening /Repairs to the 750mm dia MS rising main at weak leaking spots by way of using using oxy-acetylene gas cutter plant at site to cut out window of suitable size so that welder can enter inside pipe to carry out repair works inside pipe. After making window in the pipe the same shall be dewatered along with dug out trench using dewatering pump till the pipe becomes dry so that welding works can be carried inside pipe. The job then involves cleaning of rust around cracked portions of pipe in order to carry welding process inside the pipe by chipping off rusted layers inside the pipe. The cracked portions of the pipe shall be plugged by using MS flat of 08 mm thick, 75 mm wide of suitable lengths to cover the longitudinal and circumferential cracks inside/outside the pipe. The job includes hammering of 10 mm thick MS flat plates to semicircular shape to match the profile of the pipe and then welding of the same to the pipe along the sides through multiple weld runs using superior quality electrodes to ensure strong and leak proof joints. After completing the welding works inside pipe the cut out window shall be fitted back on pipe by carrying out multiple weld runs along the edges of window. After every weld run the deposited oxide layer shall be chipped off before and weld bead shall be exposed for carrying out subsequent welding works on joint. The welding shall be carried out by skilled professional welder in hostile environment inside the pipe.

Repairs to the minor leakages at various spots along 750mm dia rising main at various cracked portions of pipe, pipe flanges, end to end joints, rusted bolts etc. by way of multiple weld runs outside the pipe, using MS filler material and using appropriate sized 10 mm thick MS plates to cover leakages. All above jobs includes hiring charges on account of carrying using D.G set, welding set, oxy-acetylene gas cutter, load carrier, manual labours and skilled welder for completing the repair work. All the tools and tackles required for completion for job shall be arranged by the contractor after conducting repairs the rising main shall be tested on full load followed by refilling of excavated trenches.

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