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DickR · 07-11-2017, 10:42 AM

Let's examine the numbers on that URL Siksukr cited. The WC (water capacity) of the tank shown is 47.6 lb of water, specific gravity 1.0 at room temperature. At 77 F, propane's density is 0.493 (https://en.wikipedia.org/wiki/Propane). Full of propane, the contents would weigh 47.6 * 0.493/1.0 = 23.47 lb. The 42% of WC regulation would allow for 20.0 lb, which is 85% of propane capacity. The numbers all agree.

07-11-2017, 10:42 AM	#11
DickR Senior Member Join Date: Apr 2008 Location: Moultonborough Posts: 738 Thanks: 4 Thanked 256 Times in 168 Posts	Let's examine the numbers on that URL Siksukr cited. The WC (water capacity) of the tank shown is 47.6 lb of water, specific gravity 1.0 at room temperature. At 77 F, propane's density is 0.493 (https://en.wikipedia.org/wiki/Propane). Full of propane, the contents would weigh 47.6 * 0.493/1.0 = 23.47 lb. The 42% of WC regulation would allow for 20.0 lb, which is 85% of propane capacity. The numbers all agree.