Rectification of leakages to 500 mm dia rising main and allied repair works at Water Supply Scheme Pokhribal Stage 2nd.

Amount

Trench cutting by engagement of excavator (JCB) at leakage spot for four hours to expose the leakage portion cum joint. The job includes cutting of window using oxy-acetylene gas cutter in the 500 mm ND pipe to ensure de-watering of pipe followed by dewatering of accumulated water in the pit and chamber at the work place using dewatering pump for six hours. The job includes cutting of windows of appropriate size at the required place in the above pipe using oxy-acetylene gas cutter for welding of the cracked portion of the pipe from inside. The job further includes welding of 10 mm thick MS Plate of required size from outside over the cracked portion to ensure leak proof system at cracked spot. The job further includes welding back of already cut windows in two runs by using electric arc welding using high quality electrodes, making it complete leakage proof. The job includes all cost on a/c of nuts, bolts, gasket, welding cum DG set, gas cutter, tri-pod, dewatering pumps, skilled labour etc. engaged for successful execution of job at site. The job further includes back filling, soaking and consolidation after full load testing.

Trench cutting by engagement of excavator (JCB) at leakage spot for 02 hours to expose the leakage portion of wash out system. The job further includes de-watering of accumulated water in the chamber at the work place using dewatering pump for 03 hours. Dismantling of wash-out sluice valve by way of engagement of skilled labour and cutting of rusted / damaged nuts and bolts. The further includes replacement of damaged long radius M.S bend by way of cutting using oxy acetylene gas cutter. The job further includes P/ F of fresh 200 mm dia. long radius – 10 mm thick bend (as per site requirement) duly flanged on one side with flange thickness of 18 mm and welded with existing wash out pipe by using high quality electrodes. The job includes all cost on a/c of nuts, bolts, gasket, welding cum DG set, gas cutter, tri-pod, dewatering pumps, skilled labour etc. engaged for successful execution of job at site. The job further includes back filling, soaking and consolidation after full load testing.

Repairs to delivery manifold of 500mm ND rising main by way identifying the leaking spots. The job includes cutting of windows of appropriate size at the required places in the delivery manifold using oxy-acetylene gas cutter in the 500 mm ND pipe and 250mm pipe respectively for welding of the cracked portion of the delivery manifold from inside. The job includes cleaning of the leaked spots of the manifolds from, rust and other foreign bodies and then welding of cracked/leaking spots from outside by arc welding using high quality electrodes. The process is made continuous unless leaking spots are made leak proof. The job further includes welding back of already cut windows in two runs by using electric arc welding using high quality electrodes, making it complete leakage proof. The job further includes welding of 8 mm thick MS piece at the leaking spot after cutting it as per the joint profile. After carrying out the work, testing of the delivery manifold for any leakage on full load is included in the job.

Providing and fitting of Air Release Valves:  Dia. of Valves: =80 mm  Type of Valves: Single Chamber, Double Orifice triple action Air release valve:  Body = Ductile Iron  Float = Stainless steel  Shell body = Stainless steel  Gasket & seal = EPDM rubber (Gr. W 270)  Screws = stainless steel AISI 304  Pressure rating =16 kg/cm²  Coating: Inside and outside Epoxy powder coated,250 microns, shade RAL5005 (Blue)  Material grade of valves shall be GGG-40 or equivalent as per Indian standard for above pressure rating. The job includes P/F of compatible matching flange. The job includes dismantling existing damaged ARV. All tools and tackles required for successful execution of the job is included in scope of work.

M/S BHAT ENGINEERING