design, manufacturing and supply of ugb and lgb oil coolers at lower periyar power house, karimanal, idukki , design, manufacturing and supply all two set of ugb oil cooler of 60 mw machine of lower periyar hep exactly as per the dimensions of existing ugb oil cooler. material of construction: 1. copper-nickel ( cupronickel ) 90 / 10 tubes 12.7 mm od x 1300mm long , 20swg tkw wound , 70 nos.with steel spacers. 2. tube plate brass, header plate, cover etc. ms. 3. all other materials for compleating the work. , design, manufacturing and supply oflgbcooler of60 mw machine of lower periyar hep as per dimentions of existing lgb oil cooler material of construction: 1copper-nickel ( cupronickel ) 12.7mmod x 900 mm long, 20swg tkw wound 27 nos.with steel spacers. 2. tube plate brass, header plates, cover etc. ms. 3. all other materials for compleating the work.