Extension rods for stop valves inside cargo tanks are to be fitted with gastight deck penetrations and open/closed indicators.
All other stop valves are to be so designed as to indicate whether they are open or closed.
Emergency operating mechanisms are to be provided for stop valves in cargo tanks which are actuated hydraulically or pneumatically.
Hand-operated pumps which are connected to the hydraulic system in such a way that they can be isolated may be regarded as emergency operating mechanisms.
An emergency operating mechanism controlled from the deck can be dispensed with provided that the cargo tank can be emptied by another line or the shutoff valve is located in the adjacent tank.
