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Old 01-03-2018, 03:39 PM   #11 (permalink)
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Consider this calculator

https://www.engineersedge.com/calcul...l_pres_pop.htm

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.)

Ty
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Old 01-03-2018, 04:14 PM   #12 (permalink)
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I've had the 1/8" threaded portion of a Bushmaster 2K HPR fail when exposed to an unregulated 3K air tank( reg on the tank failed blew the gauge blah blah blah). YMMV
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Old 01-03-2018, 04:17 PM   #13 (permalink)
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Threads are very likely the highest stress point. I only did the work for the material in the gas through. The threads require another calculator, which I don't currently have in my bookmarks. Sorry.

Ty
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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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Old 01-03-2018, 09:12 PM   #14 (permalink)
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Gas-thru grips won't burst, the fitting would fail first. From my understanding, 1/8 NPT is actually a very weak threading. It's the reason that the industry standard Norgren macro line fittings are NOT rated to 800 psi.
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