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-   -   Tanks for PCP (http://airgunsforum.org/showthread.php?t=275)

critter99 08-30-2014 03:38 AM

Tanks for PCP
 
3 Attachment(s)
550 Cubic Inches is largest standard SCBA tank on market

this is a 87 or 88 cubic foot tank depending on which known brands rates it

97 cubic foot tanks are a MYTH

http://i941.photobucket.com/albums/a...ps51065273.jpg

and the reason is
http://i941.photobucket.com/albums/a...psc54d7d94.jpg


http://i941.photobucket.com/albums/a...pse5e3e46c.jpg

http://i941.photobucket.com/albums/a...ps930a3ccc.jpg

http://i941.photobucket.com/albums/a...psa2a5b785.jpg

Clifford 08-30-2014 03:41 AM

I like how he used to advertise them at 88 and now they are 97. What changed? Nothing.

PakProtector 08-30-2014 03:47 AM

The reason behind the myth is that the 97.something cu. ft, so called 'rating' is calculated with Boyle's Ideal Gas Law...which states that a volume reduction results in a proportional change in pressure....for example, halve the volume and double the pressure...infinitely. reasonable analysis tells us that air molecules take up space and this Ideal behavior can not go on forever.

The air is slightly more compressible below 3,000 psi, and right on the Ideal line at that pressure, but is less compressible above 3000 psi. By 4500 psi, is is taking up about 13% more space than the Ideal Gas Law says it should...and so if there is only 550 ci to occupy at 4500 psi, there will only be 88 standard cu ft at atmospheric pressure crammed inside it, and not the 97.something the Ideal Gas Law would indicate( assuming the foolish assumption that air behaves as an ideal gas at 4500 psi was made ). A scientist by the name of van der Waals quantified the departure from Ideal Gas Law.
cheers,
Douglas

grumpy 08-30-2014 03:48 AM

Quote:

Originally Posted by Clifford (Post 737)
I like how he used to advertise them at 88 and now they are 97. What changed? Nothing.

His prices, and it aint less...

Cricket 08-30-2014 03:51 AM

deception in marketing what else is he deceiving us with>>>:? I like honest people my self and that is NOT honest advertisement

Bob La Londe 03-02-2015 12:59 AM

Anf FPS doesn't matter... LOL.

jonathan 03-02-2015 03:49 PM

Excellent info here

critter99 05-01-2015 03:21 AM

Bottom line his tanks are QUALITY USA tanks......

I wish the whole 97 thing and fudged true math calculations had never been started by that seller of the Korean made tanks...sure seems like they are the root of many evil practices in the hobby


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