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Old 08-30-2014, 02:38 AM   #1
critter99
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Default Tanks for PCP

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



and the reason is







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Last edited by critter99; 08-31-2014 at 10:22 PM..
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Old 08-30-2014, 02:41 AM   #2
Clifford
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I like how he used to advertise them at 88 and now they are 97. What changed? Nothing.
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Old 08-30-2014, 02:47 AM   #3
PakProtector
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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
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Old 08-30-2014, 02:48 AM   #4
grumpy
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Quote:
Originally Posted by Clifford View Post
I like how he used to advertise them at 88 and now they are 97. What changed? Nothing.
His prices, and it aint less...
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Old 08-30-2014, 02:51 AM   #5
Cricket
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deception in marketing what else is he deceiving us with>>>:? I like honest people my self and that is NOT honest advertisement
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Old 03-01-2015, 11:59 PM   #6
Bob La Londe
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Anf FPS doesn't matter... LOL.
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Old 03-02-2015, 02:49 PM   #7
jonathan
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Excellent info here
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Old 05-01-2015, 02:21 AM   #8
critter99
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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

Last edited by critter99; 05-01-2015 at 04:28 PM..
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