tender for renewal of defective boiler tubes or bends in economizer hanger tubes; 1 cutting the worn out tubes of tube dia above 44.5mm, & up to 63.5x5.2mm of economizer hanger tubes & rear water wall screen tubes edge preparation of the new & existing tubes, positioning the tubes with proper alignment, tig and arc welding the joint with ibr welder, cost of argon gas, cutting gas, all consumables, t&p’s, hire charges for welding generator, tig set and etc. 2 arrangement of platform and scaffolding materials and erection of the same wherever required in boiler economizer hanger tubes & rear water wall screen tubes and transporting the scaffolding materials. note: platform provide only walk way board.