defect rectification on fixed firefighting system onboard one large naval vessel at nsry ( kar ) , services , halon bottles pressure testing to be carried out . capacity - 20 ltrs , 80 ltrd , 130 ltrs . working pressure - 80 bar , testing pressure - 125 bar , co-iv and co-500 container shell to be pressure tested , wp- 10 bar , tp-15 bar , air charging valve of halon bottles found stuck in closed position . valves to be overhauled and pressure tested . type- angle valve . job entails de-pressurising of halon bottles , removal and pressure testing of halon bottles and system for leaks post fitment of air charging valves . , chemical fire smoothing system . ( refit all system valves ( 1 job ) , take sample fo halon liquid from the extinguisher for regulatory compliance tests . , carry out internal visual inspection of the tanks of co_iv and co-500 units , carry out technical examination of the cylinders of co_iv units , proving of halon , co-iv and co-500 systems including alarms and indicators