Installation of LNG pipeline drain valves
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For the drain valve on LNG pipelines, should a plug or blind flange be installed behind the valve? With it, there’s liquid; it’s dangerous. Without it, the flammable liquid doesn’t meet the standards. What’s the situation among fellow seafarers?
LNG, liquefied natural gas: a wire plug or blind flange should be installed behind the drain valve. No, flammable liquids do not meet the specifications ； Add, there is liquid, dangerous — only water expands when it freezes; the presence of liquid does not necessarily mean there is danger. Even with water, what would happen if there was a slight internal leak and freezing occurred behind the valve?
LNG expands by 630 times in volume; the term \"liquid\" here refers to LNG, and it can explode
It should be added; there won’t be any water inside, and the liquid won’t explode
They are generally collected together; nothing should be added behind the valve. Usually closed.
There is also a gap between the two valves; it won’t work
I don’t understand why it expands; if the insulation is done properly, it should remain in a liquid state, right?
It’s not necessary to include it, but you need to connect the discharge outlet of the drain valve to the flare line; if there is no flare line, then an exhaust line must be installed. Some systems also use 8-shaped blind plates, which can make shutdown procedures more complicated.
Are there quick blind flanges suitable for drain valves? ? ?