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Old 01-03-2018, 03:39 PM   #11 (permalink)
Brass Monkey Customs
tymcneer's Avatar
Join Date: Oct 2006
Location: Bowie MD

Brass and Wood Fan
Kilt Club
Consider this calculator

If you use the following values you can get an idea of the safety of a gas through grip

P = 1800 psi (The burst rating on a CO2 safety)
R = 0.25" (this means the passage is 1/2" diameter, which is considerably larger than most gas through grips)
S = 14000 psi (this is using the WRONG, but lowest number from MatWeb for 6061 aluminium)
E = .80 (80% joint efficiency)

This yields a resulting wall thickness of 0.0445"

Most gas through grips are around 3/8" dia passage, and 3/4" or larger outside diameter... Running those numbers... with a wall thickness of 0.1875" and an OD of 0.75", the result is 7000 psi.

Personally, I like to down rate things... No need to expose yourself to unnecessary risks, so assume 50% and you still have 3500 psi with a 2x safety rating (My engineer friends can chime in and point out that this is not enough, according to the industry, if this is the case.)


Brass Monkey Customs

Brass Freak, Freak XL compatible and Equation inserts in .670, .678, and .685

Still selling brass tubing, with .678 barrel stock available!

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