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Old 09-18-2012, 08:11 PM   #11
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On the collar of the tank should be the initials TW which stands for tare weight. That is the empty wt of the tank. weigh the tank on your bathroom scales, deduct the TW and divide the balance by 4.2 and that will give you the number of gallons left. Best to do this all outside. Hope this helps.

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Old 09-19-2012, 09:21 AM   #12
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The small propane shop where I fill has mechanical guages. There's a probe with a float attached to the valve (you have to replace the existing valve) that rotates a small magnet in the valve assembly. The guage clips to the outside of the valve and the needle is controlled by the magnet position. The owner told me that he hasn't had any complaints with them but the guage tends to fall off and get lost (it's only clipped on) and he sells replacements fairly often.
The common guages work off pressure and as tafiche points out aren't very good. IMHO they will tell you when the tank is empty (or very nearly so) and if the tank is empty I don't need a guage to tell me that.


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Old 09-22-2012, 12:40 PM   #13
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Too bad we all aren't driving propane powered forklifts. They have nifty gauges built in to the tanks. I wonder why 20-30lb RV tanks don't have the same thing unless the orientation has something to do with it. Forklift tanks are horizontal when in use.

Maybe Hank Hill could chime in.
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Old 10-11-2012, 05:30 AM   #14
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All propane cylinders are have their tare weight (TW) stamped on them. TW is the weight of the tank as it was manufactured - no propane. On a 20 pound cylinder it is usually 16 to 19 pounds.

After you weigh your cylinder, subtract the TW. The rest of the weight is propane. And as previously stated in this thread, each gallon weighs about 4.2 gallons.

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