Recovery tank capacity


#1

Is there a reason that these butane tanks only come with 25 lbs. The capacity of the recovery tank is 80% of the WC weight listed correct? So if I have a 50 lb tank and the WC is 47lb, I can recover up to 37 lb?


#2

This always confused me as well. I’m hoping someone can shed some light onto this.


#3

You need to account for the difference in density between water and n-butane.

Specific gravity for n-butane @25C=.601

47lb WC X .8 X .601= 22.6lb n-butane capacity @ %80 full @ 25C.

Your tank can only hold 28.2 lb n-butane total before it’s completely full at room temp.

For some perspective:
1 gallon water==== 8.3 lb
1 gallon n-butane= 4.8 lb


#4

Thanks thats what I was looking for