Details: maintenance & testing of process heat exchangers (floating head & u-tube type): wherever required, piping spools & valves to be dismantled to facilitate removal of end covers and same to be re-erected back after maintenance of hex's. gaskets of all the joints within first isolation valves in inlet, outlet, vent and drain lines of hex shall be replaced (servicing of valves is excluded). heat exchanger channel covers, floating head & shell covers are to be removed, tube bundle shall be removed from hx shell, re-insertion of bundle after cleaning of tube outside surfaces by hydro-jetting, cleaning of shell and inspection, pass partion plates as well as surfaces to be reconditioned by welding followed by grinding, lapping etc. cleaning of inside surface of tubes by hydrojetting, air drying of tubes (tubes surface inspection & ect of tubes shall be done by hwpk), cleaning of fasteners., plugging of defective tubes by tig welding followed by dp test, ring testing for checking leaky tube
Sector: Water Resource Department