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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Today's Featured Article - Old Time Threshing - by Anthony West. A lovely harvest evening late September 1947, I was a school boy, like all school boys I loved harvest time. The golden corn ripens well and early, the stoking, stacking,.... the drawing in with the tractors and trailers and a few buck rakes thrown in, and possibly a heavy horse. It would be a great day for the collies and the terrier dogs, rats and mice would be at the bottom of the stacks so the dogs, would have a busy time hunting and killing, all the corn was gathered and ricked in what we c
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