What Is Maximum PSI In .22 Rimfire Can?

[Historian]

Reading "US ARMY FRANKFORD ARSENAL SILENCERS PRINCIPLES AND EVALUATIONS"
where they evaluated .22. Figure of 24,000 PSI chamber but 1,000 PSI estimated
at muzzle.

It puts the lie to Hollywood's cartoonish use of 'soda bottle plastic suppressors'
by secret agents on the run.

Curious, what metrics if any do present day companies use to build their cans in order
to withstand maximum PSI for each calibre?

For example modern cans such as MASK HD can handle
"22LR, 22MAG, 22 HORNET, 17 HMR, 17 WSM, 5.7X28MM (FNH)" , some
hot rounds.

[ECCO Machine]

Reading "US ARMY FRANKFORD ARSENAL SILENCERS PRINCIPLES AND EVALUATIONS"
where they evaluated .22. Figure of 24,000 PSI chamber but 1,000 PSI estimated
at muzzle.

It puts the lie to Hollywood's cartoonish use of 'soda bottle plastic suppressors'
by secret agents on the run.

You're forgetting Boyle's Law, the inverse relationship of pressure & volume in a closed system. If you take a 1,000 PSI exit pressure from a .223" x 20" tube (.78 cu. in) and vent it into a in 2 liter bottle (122 cu.in.), your pressure is now 6.4 PSI even if there is no exit hole in the bottle. 1,000 ÷ (122/.78)

[T-Rex]

As Ecco pointed out, the volume of the system (chamber, barrel, suppressor) is exponentially greater than the chamber itself. Suppressors aren't sealed vessels and don't warrant the same engineering/design.

[Historian]

Oh, oh, ECCO, your saying " ..You're forgetting Boyle's Law," hurt me to the quick.
RAYLEIGH*ly now.

Guess at upcoming 60th class reunion
Math/Physics degrees get recalled

But you are forgiven, my friend. Thank you for chuckle.

Seriously, the impetus for the question arose from the
last set of shredding accumulated suppressor papers, articles,
notes, design sketches, etc., started in 1960s. Most have
happily been implemented magnificently by the great US
companies.

One forgotten note into shredder was a design inspired from a conversation
in 1970s with Major Dick Culver who described an OCONUS can, one end cap,
made by an armorer for a specialized compact .45 bolt action rifle
that was "as quiet as a sneaky breaking of wind [ actual
Marine terminology not printable here] that peeled the paint from
the ceiling".

Musing over its dimensions** I sketched a modification of the can for
.22 with only 3 parts that also obviated misalignment. The 'Reverse-Snorkel'
partially inspired by 1960s 'backroom' at Parker Hale of one off .22 MM1
snorkel can with no baffles.

Volume of present day cans such as great DeadAir Mask HD have around
4 cubic inches or so, and many pieces.

I wondered how much quieter if any Culver-Can would have given
the nearly 4 times increase in expansion volume and which number,
24,000 psi or 1,000 psi to use in PV = nRT.

Again, thank you for taking time to respond.

Best.





*John William Strutt, 3rd Baron Rayleigh
"Rayleigh scattering"

** ~ 9" x 1.75" diameter.

[ECCO Machine]

Oh, oh, ECCO, your saying " ..You're forgetting Boyle's Law," hurt me to the quick.
RAYLEIGH*ly now.

Guess at upcoming 60th class reunion
Math/Physics degrees get recalled

But you are forgiven, my friend. Thank you for chuckle.

No need to be snarky. I don't know your background, your education. I just know a 2L soda bottle can handle about 125 PSI, which is a heck of a lot more pressure than a .22 rimfire can produce at muzzle filling a vessel with that internal volume.

[Historian]

Ecco, buddy, please accept my sincerest apologies if my Southie sense of humor caused
you to think "..No need to be snarky." Never intended.

Actually I was chuckling at the puns that it brought to mind as I was reading about the Boyle's Law
comment, and the JOULES that Sherlock OHMS [ EE jokes ] one could find buried in my post, etc.

You actually did supply me with the answer I was looking for on pressure experienced in containers,
especially in light of the number of cans that have been reported over
the years hurtling down range due to bad machining and materials.

Hope we are good!

If we could go back to 60s I would invite you for
a cold beer to make up for the misunderstanding at the less than reputable
but nefarious character filled taverns on Broadway.

Best, my friend.