supply of pipe coupling for overhauling of unit no. 12, btps, obra, sonebhadra , 14” m.s. pipe coupling set having od - 355.60 mm of ash disposal line ( as per sample ) one set consists of: ( a ) sleeve - 01 no. ( dimensions of sleeve: id - 365mm, od-387mm, width-173mm, plain-140 mm, both end 16.5 mm each taper.material: m.s. ) ( b ) collar - 02 nos. ( dimensions of collar: id - 360 mm, od - 415 mm, depth - 24 mm, width - 35 mm with 8 nos. projected square groove for fixing bolt, material: cast steel ) ( c ) gasket - 02 nos. ( dimensions of gaskets: id-350 mm, thickness-12 mm collar side and 3.5 mm sleeve side ( one side tapered after 8 mm ) , width 24 mm to match & fit sleeve taper side. material: neoprene rubber ) ( d ) bolt & nut - 08 nos. ( dimensions of bolt: 5 / 8” x 11” half round square head with 3” threaded portion from one end with one nut. material: m.s. )