Propane Tanks

[Freelander]

Right here it says full is 80%.

I’m not going to argue with you anymore.

 

[Freelander]

Also I’m been told by propane companies that these tanks have an auto fill valve that will stop the flow when full.

And I have seen happen, the tank stop filling at 80% full.

 

[flylo]

I worked & was part owner of a co wlth a fill station & wanted to take them to my very remote cabin so I filled 5 100# tanks & packed them full & of course paid for all I used. First hot day & the vapor was spitting out of all 5. Look at all the time, gas, money you wasted trying to squeeze another cupful in. Ethan is !00% correct. That tank looks like its getting rusty, I bet it's past it's hydro date isn't it?

 

[Freelander]

Since 1998, ASME tanks or any RV propane tank installed on motor homes, as well as standard DOT propane cylinders, are required to come equipped with overfill protection devices that prevent a dangerous amount of propane from being filled into tanks.

Because of the nature of propane as a volatile gas that expands under increased temperatures, the overfill protection device, or OPD valve, only allows an RV propane tank to be filled to 80 percent capacity. Dave Solberg opens up an RV propane cylinder that would typically be mounted to a trailer to show you how the overfill protection device works in typical RV propane tanks. He demonstrates how the mechanism operates, and discusses the importance of such a simple component.

The OPD valve automatically causes the RV propane valve to stop filling once it has reached its allotted 80 percent in order to excess expansion and dangerous explosions that could occur when you are least expecting it.

All RV propane tank models constructed since 1998 utilize a triangular knob, which signifies that the appliance is equipped with an overfill protection device. If you take your RV propane tank into a certified filling station, the technicians are required to refuse to fill any model that has a round or otherwise shaped knob.

Thus, when purchasing a used RV, you should check your model to determine whether your model has a working OPD valve and swap it out for a newer, more modern unit if it was built before 1998. Likewise, if you notice that your OPD valve is malfunctioning or you hear any strange noises coming from inside the ASME tank, you should consider having the system repaired prior to visiting a certified refill station. Remember, this applies to all propane tanks, including DOT cylinders used for standard backyard grilling units.


https://www.rvrepairclub.com/video/...otection-device-on-an-rv-propane-tank-007955/

 

[LargeMarge]

Commercial pilot here.
Conversant in the basic concept of weights and measures with an emphasis on balance.
.
Generally, we figure most liquids tend to weigh about 8# (eight pounds) per gallon.
Water, gasoline, battery acid, tuna-shooters straight from the little can after you get rid of the fish, all of them, about the same weight (or close enough for g*v***m**t work).
.
If you were charged for 8#, that would be approximately a gallon of propane.
.
From your description, you give the impression your operator weighed your propane tank pre-fill, then re-weighed post-fill?
Is this accurate?
.
First I heard of it.
But I need to get out more, anyway.

 

[Freelander]

Propane weights about 4.2 lbs per gallon.