Filling Propane Tanks
Over the past few years whenever I take my propane tanks from my trailer to be filled, the person doing the filling always opened a vent on the tank valve with a screwdriver as he/she was adding propa...
Forum Discussion
The "vent" that they open while filling tanks and cylinders is not actually a "vent" at all. It's official name is the "Fixed liquid level gauge", and it's connected to a calibrated tube that vents gas until the liquid propane reached the tube. The difference is readily apparent when that happens. Refillers that fill DOT cylinders by weight often don't open the gauge valve, and most of the time, the correct weight will be reached just before the OPD valve trips. The fixed ASME tanks on motorhomes can't be filled by weight of course, so the level gauge should always be open while they're filling.
