Tapping cans you say? Most canned butane isn’t straight n-butane, but a mix. Could be your tank with higher pressure actually does have more propane, leading to higher pressure.
I was also wondering about your testing of the gauge by using the prv. Do you mean that you let some pressure out with the prv and observed a drop in pressure? That would let you know the gauge is in fact moving, but still doesn’t confirm it is reading correctly. If you have another gauge that could be used to verify pressure, it would be a good thing to try.
The cans say 99.9 percent butane .
I used the prv to test the gauge by lowering it to same psi as my gauge and watching it release pressure . I did this at several different psi numbers to make sure it was correct ( first 90 then 70 then 60)
Could be all n-butane, or could also be more of a marketing term for “butane”, ie possibly a mix of n-butane and/or isobutane. Hard to know for sure without a brand name, but I don’t recall too many canned tane being all n-butane other than Puretane and a couple other random brands catering to old school open blasters and other sketchy home dab labs.
They also have small amount of air in the line between on the tapper. so if you didn’t purge the air out you could have air in there. Eitherway way dump those nasty things and at least clean and start fresh if you gonna use them again.
If you are using lighter butane, it is not likely to be 99% n-Butane, because it wouldn’t have enough pressure to operate at many locations. What brand? Did you pull a MSDS sheet to verify the label.
Lighter butane mixes can change with location and time of year. Did all the cans come from the same case and have the same lot number?
You can entrap air without a pump, by not fully vacuuming a system before recovery.
Yep. Although JUST neglecting to vacuum the LINES won’t usually result in noticeable pressure differences as the volume of the lines is minimal when compared to the system as a whole. It is difficult to compound those additions without a pump.
Neglecting to vac a TANK will provide obvious pressure differences…
But that’s still not the issue I had because after venting off the pressure and refilling the tank with distilled butane I’m back to normal and have no more over pressure issues
after venting off the propane and iso-butane, I only have butane left
Had you cooled your tank in dry ice before venting, you would not have lowered the pressure much at all…but any AIR would have still been a gas and could have been vented (if you’d had any…)
