contract for operation of valves at kolihan nagar township , laying of old/newms/ci/gi pipe lines o all classes with welded flanged sockets joints including fabrication of bend , flanges expansion joints etc . connected with the laying o pipe line at all heightsb ) pipe line up[to 2 to 4 1/2 n . b size , laying of old/newms/ci/gi pipe lines o all classes with welded flanged sockets joints including fabrication of bend , flanges expansion joints etc . connected with the laying o pipe line at all heightsc ) pipe 5 to 8 n . b size , dismantling of steel structure such as platforms , support railing , hoppers , chutes , ducts , cells dismantling of mech . equipments and elect . equipments/ assemblies including rubber lined pipe line all heights , opening & closing of valves as per location , timing and schedule , filling of kcm township tank , operation of tube wells of kcm township in all three shifts as and when required . , providing lead caulked joints to sand cast iron/centrifugally cast ( spun ) iron pipes and fittings of diameter : 100 mm , lead jointing of pipe line of dia . up to 30cm dewatering of pipe line all the materials required for the work will be issued freeof cost . the agency will arrange labours , tools& tackles for dewatering , leadjointing , transportation , earth work in excavation by mechanical means ( hydraulic excavator ) / manual means in foundation trenches or drains ( not exceeding 1 . 5 m in width or 10 sqm on plan ) including dressing of sides and ramming of bottoms , lift up