supply, dismantling and erection of ms pipes with insulation for chilled water line of esp iv ac plant , supply of various sizes of ms erw pipes with insulation for chilled water line of esp iv ac plant , 80 nb erw pipe with insulation class : c heavy duty, material: mild steel, standard: is 1239 , 65 nb erw pipe with insulation class : c heavy duty, material: mild steel, standard: is 1239 , 50 nb erw pipe with insulation class : c heavy duty, material: mild steel, standard: is 1239 , dismantling and erection of ms pipes with insulation for chilled water line of esp iv ac plant , erection of 80 nb erw pipe with insulation , erection of 65 nb erw pipe with insulation , erection of50 nb erw pipe with insulation