tender for replacement of air and water pipe in inspection gallery of nangal dam.; 1 civil work 2 providing, laying, jointing, fixing and testing isi marked g.i. pipe (as per is 1239) b class including cost of specials (such as tees, bends, sockets, elbows etc.), painting with anti-corrosive bitumastic paint, testing, cutting, threading inside building complete. 40mm i/d [as per csr-2020 item no. 28.35 e] zone a 3 providing, fixing and jointing isi marked gunmetal peet valves (heavy pattern) as per is 778 with hand wheels, on g.i. pipe lines laid in the ground or inside buildings including all carriages complete. 32mm i/d gun metal peet valve heavy pattern. [as per csr-2020 item no. 28.43 d] zone a 4 dismantling, disjointing, removal of g.i. pipe lines, specials, valves and fittings complete in all respects. 40mm internal diameter pipe line. [as per csr-2020 item no. 28.63 e] zone a 5 type ii (wp up to 10 bar) rubber stream hose of bore size 25 millimetre (quotation from gem portal)