Quote:
Originally Posted by tentcamper
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FYI If you exchange your propane tank, you only get a 3/4 full tank (15 lbs of propane compared to 20 lbs). Propane re-filler fill to 20 lbs. Something to do with DOT and the number of full 20 lbs tanks that can be transported force the exchange people to limit the propane to 15 lbs. Check it out read the fine print on the sign at the exchange location it will say 15 lbs.
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This may be true for vertical tanks, but there is no exchange program for those of us with horizontal tanks. Also, all tanks are only filled to about 80 percent liquid, to allow space for expansion with temperature changes. But a 20 lb tank should be filled with 20 lb of propane, about 4.7 gallons, if completely empty. That equals the 80 percent liquid volume.
Edit: just read an article where the author claims the 15 lb placed in exchange tanks started when propane prices rose, and people didn't want to pay more for the exchange. So they reduced the amount of propane. If this is true, they won't go back to 20 lb if propane prices fall, I'm pretty sure. I doubt very much there is a DOT limit on cylinder weights to 15 lb. Think about it, they carry 6000 gallons in pressurized bulk tanks on the road.