Comments by "ricardo kowalski" (@ricardokowalski1579) on "Drachinifel"
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51:00 Degassing
Short answer Drach is right, by the time the navy gets the bunker fuel it is already de-gassed. It happens before distribution.
Long answer
Crude oil has hydrocarbon gas in solution, refined fuel and destilate products have little or no gas in solution.
Crude oil inside the reservoir is under pressure, and gases are dissolved in the crude oil, held in solution by the pressure. During production, as crude oil travels UP the wellbore the hydrostatic pressure is reduced. A lot of gas comes out of solution as pressure is reduced. (think opening a bottle of soda that forms a lot of bubbles suddenly when it is opened). The first step of De-gassing is what is called a "gas separator", usually at the well site. The gas separator is a primitive device, simply a tall cylinder with baflles inside to allow the gas to vent to the top, and liquid to collect on the bottom. The crude oil that comes out of the separator is called "unweathered".
The unweathered crude is then pumped into pipelines under some (lower) pressure. In the refinery the crude is then passed thru a vacuum Degasser to capture valuable gas (these gases are feedstock for chemicals or used as fuel)
The degassed crude is now passed thru a distillation column, where the different fractions of hydrocarbons are separated by their condensation temperature (pretty much a large moonshine still). The liquids that are extracted from the distillation column are called distillates and have negligible amounts of gas in solution.
The most valuable fractions become gasoline or diesel. The less valuable are called BUNKER FUEL. Bunker fuel is just a notch above asphalt and tar. Ship's boiler run on bunker fuel. Bunker fuel usually has to be heated to thin it out and pump it, use it in burners for boilers. This is why ships have fuel heaters and pre-heaters.
Beware that distilates are still volatile, they can evaporate and become gaseous (gasoline in open jars will evaporate)... but this is a change in phase, not release of solution gas.
Cheers.
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The difficulties this rapid pace of change imposed on management deserves attention. Within a service life, a commander would have to oversee the addition of engineers and stokers, the carpenter equaled to the blacksmith/riveter, coal added to the supply considerations, head of steam buildup and lag understood. It is not only a matter of where would you find qualified people to run the sophisticated machinery. Who of the previous generation can train the new officers on how to command these innovations and these new ratings? How do you retain them? A steam engineer is not an illiterate midshipman that you can gang presss into service and manage by lashes. And mind you, it will only get worst with the introduction of radio, electricity, hydraulics, electronics, diesels, turbines. The fact that the RN as an organization survived all these changes and pressures is remarkable.
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