Refilling 16 oz propane bottle off a 20# tank

2oldman wrote:

westend wrote:
Two 100,000 bbl tanks = 200,000 bbls. 8,400,000 gals.

Propane at 4.25lb/gal, that's 988 tons, give a ton or two.

I dunno the comparative energy in a pound of propane vs. pound of TNT, but there it is. That's a long way from 15,000 tons.

That's not the answer I get but is somewhat immaterial. If 8 million gallons of propane starts igniting, I don't want to be anywhere close.

Before the owners installed a cooling/pressurizing plant onboard, there was a lot of "white knuckling" watching cargo temps and tank pressures. The tanks were set up with automatic relief valves, a set of ten or so 6" pipes that would evacuate pressure when it reached a certain threshold. The cloud of propane that came out of those suckers was a thing to behold, massive.
At certain times, when pressures were close to the relief threshold, we would hang a 10" cargo hose over the side and relieve some pressure. It was a better situation than trying to steer away from that cloud of gas.
After the cooling array was installed, we didn't have any of those discharge issues. I also learned that a dozen cases of beer could be chilled in a few minutes by discharging through the 3/4" inspection/sampling valve. Just had to keep the deckhands away with their chipping hammers until the propane "iceberg" melted away.