[C320-list] How to assess Propane fill

[Warren Updike]

Here is an accurate way to measure the level of propane in the tank. The
only thing you need is a scale to weigh the tank.

All propane tanks will have two weights stamped on the collar (top handle.)

TW (Tare Weight) - weight empty

WC (Water Capacity) - weight of tank when filled with water.

Regulations limit the propane level to not exceed 42% of the WC

Liquid propane weight 4.2 lbs/(US)gal.

 

My "10lb" aluminum tank WC=23.8; TW 10.0

Allowed propane weight it 23.8*.42=10 lbs

Propane weight + TW = weight of tank when full (10 + 10 = 20 lbs)

Or, 10lbs / 4.2lbs/gal = 2.38lbs of propane in full tank

 

I.e. if tank weighs 17 lbs, 17 - 10 TW = 7 lbs of propane at 4.2 lbs/gal =
1.67 gal of propane or 70% full

 

Some stations sell by gallon, others by weight. So, figure both and compare
to what the attendant says when full.

 

Warren and Pattie Updike

1994 C320 "Warr de Mar" #62

Middle River, Chesapeake Bay