LNG leak handling steps
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Recently, while working on the emergency response plan for LNG stations, the manager said that in case of a leak, the leak should be sealed first before shutting off the valves; however, I think the valves should be shut off first, and then efforts should be made to seal the leak. Friends from Sichuan, let’s discuss whether to close the valve first or seal the leak first in case of a leakage.
Close the valve first; otherwise it’s impossible to block the flow, as there is pressure involved. The volume expansion ratio of LNG when it vaporizes is 625 times, so it cannot be blocked. Even after closing the valve, direct skin contact should be avoided, as the temperature of LNG is -162 degrees, which can cause frostbite. Proper anti-freezing measures must be taken.
I think so too; the valve must be closed first
The valve must be closed first; this is to cut off the source.
It’s all nonsense; the LNG pressure is very low. It depends on which part is missed. Things like flanges can be tightened first; of course, if there is a pump, it needs to be stopped first. For leaks at the valve seat, it’s also possible to take a close look first. If the pipeline isn’t welded properly and there’s a leak, then it’s necessary to close the valve and drain the fluid. If the root valve leaks, the only option is to empty the tank. The tank is leaking; if it’s an underground tank, it’s best to run away quickly. . . . .
Handle each situation on its own; you’re right, it’s mainly a matter of experience
Leaks have been detected in the LNG storage tank itself, such as icing on the outer tank wall. The tank should be emptied as quickly as possible while maintaining the tank pressure as constant as possible. Sealing leaks is not suitable for LNG storage tanks.