Quote:
Originally Posted by Snoking
I believe all small propane tanks were designed with 10% room for expansion. So a 5gal 20 lb tank normally hold 4.5 +/- or 18 lbs. Tanks are stamped with empty and full weight.
The exchange tank vendors have been ripping people off for years, as their tank are not completely full to 90%.
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My understanding was that the 20lb rating includes that safety margin. 4.2lb/gal x 4.7gal is a complete fill (with vapor margin at room temperature). 19lb fill when it's really hot outside, 18lb fill was the first time the industry started cheating us. I could be wrong though.