bids are invited for erection of new pipelines1 - fabrication and laying of new supply & return pipe lines for provisioning of compressed air, water & fuel to new and old machines (inclusive of welding of required bends, t-section, flanges & fixing of valves of various sizes)ø15 mm- ø25 mm nb pipe line , erection of new pipelines2 - fabrication and laying of new supply & return pipe lines for provisioning of compressed air, water & fuel to new and old machines (inclusive of welding of required bends, t-section, flanges & fixing of valves of various sizes)ø 32 mm- ø 50 mm nb pipe line , erection of new pipelines3 - fabrication and laying of new supply & return pipe lines for provisioning of compressed air, water & fuel to new and old machines (inclusive of welding of required bends, t-section, flanges & fixing of valves of various sizes)ø 65 mm- ø 80 mm nb pipe line , erection of new pipelines4 - fabrication and laying of new supply & return pipe lines for provisioning of compressed air, water & fuel to new and old machines (inclusive of welding of required bends, t-section, flanges & fixing of valves of various sizes)ø 100 mm- ø 200 mm nb pipe line , erection of structural steel5 - fabrication & installation of various sizes & shapes of mis. structural frame works for new as well as old machines and utilities / modification / repair of the existing structural frame works as per user requirement (inclusive of cutting of the structural members as per desired layout, welding of members as per requirement and fixing to the ground or wall through anchor bolts) , repair of pipelines6 - existing services pipe line crack repair work / duct line repair / pipe line removal work through cutting and weldingø15 mm- ø25 mm nb pipe line , repair of pipelines7 - existing services pipe line crack repair work / duct line repair / pipe line removal work through cutting and weldingø 65 mm- ø 80 mm nb pipe line , repair of pipelines8 - existing services pipe line crack repair work / duc