Compressed natgas and liquified natgas are not like propane.
Compressed natgas undergoes no phase change. Liquified natgas does undergo a phase change but it is a cryogenic gas unlike propane. Cryogenic means less than minus 250 degrees Fahrenheit vapor temp when released to atmospheric pressure.
The vapor pressure of LNG is uneconomical to contain. LNG is allowed to vaporize without additional heat at ambient and is then compressed and chilled back to liquid. But that is only done if the vapor is not consumed for fuel immediately. The reliquification is only done at large LNG storage facilities and not very often. The vapor goes into pipelines for distribution. I suspect that LNG freighters use the vapor for ship propulsion.
Not sure how they make it back to Yemen or other sources. Perhaps they are dual fueled or they are diesels that are pre-injected with natgas for higher HP when loaded. That would be similar to propane assisted Diesel trucks.
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