Replacement of rusted worn out 600 mm dia. Mild steel spirally welded pipe of Sitlee- Manda rising main at RD-zero and concentric pipe reducer/ expander installed on 500 mm dia. Sitlee- Lohar rising main at RD- Zero.

Amount

Replacement of rusted worn out MSSW pipe having dia. 600 mm of Sitlee- Manda rising main. The job includes carriage of welding set, gas cylinder, gas cutter, welding leads, and allied material from workshop to site of work using mechanical transport. Opening of wash out to empty the pipe. Cutting of the rusted worn out mild steel spirally welded pipe in pieces using gas cutter. Carrying the dismantled pipe pieces by head load and then stacking at Sitlee/ Store. Cutting of the new 600 mm dia. MSSW pipe provided by the deptt. approx eight (08 mtrs) in length from the pipes stored in Sitlee. All the cutting jobs should be done with industrial gases i.e oxyacetylene gas system by skilled cutters. Laying of the new pipe in alignment with the existing rising main. Fabrication, fitting and welding of new 600 mm dia. MS flange on one end of the MSSW pipe and fitting it with the NRV using new nuts and bolts. Butt welding the other end of the pipe with the existing rising main using superior quality welding electrodes in two layers and remove any flux after each layer. The job further includes replacement of worn out concentric pipe reducer/ expander installed on Sitlee- Lohar rising main by using industrial gas such as oxyacetylene gas. Cutting of the worn out reducer/ expander using oxyacetylene gas cutter and stacking it in Sitlee. Fabrication of reducer/ expander having dimension 610 mm x 508 mm x 508 mm out of 600 mm internal dia. MSSW pipe (Pipe to be provided by the deptt). The job includes making of required number of V-shaped cuts at one end of pipe length and grinding the edges. Pressing the cut edges by heat treatment process and joining properly to form 500 mm dia. end, butt welding all the joints in two layers by using superior quality welding electrodes. Beveling of both ends of expander/ reducer in order to form proper V-butt joints. The reducer/ expander shall be cut to proper size in order to make proper fit between the cut ends of rising main and welding properly in two layers. Properly chipping off the joints and then reinforcing the joint by providing and fitting of MS strips across the joint. Testing of pipe on full load condition for any leakages. Complete job includes cost of material, carriage charges and labour charges, etc

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