erection, commissioning & trial operation of main circulating cooling water, auxiliary cooling water and lp piping consisting of raw water piping, plant water piping, tg and sg dmcw piping, instrument and air piping, potable water and associated lp piping including application of lining, insulation, supply & painting as and where required including handling of materials at bhel / clients stores / storage yard and transportation to site, and handing over ofmain circulation cooling water supply and return line, auxiliary cooling water piping and lp piping including e&c of bf valve, arvs etc and any other equipment/structure required for the completion of the package including supply & installation of items as per boq of 2x800 mw ntpc singrauli stage iii project