Ha ha, check this guy out

[TOOLE]

i wish i could be arsed to sign up ti those forums to take the piss outta him

someone just tell himto go to the doctors

 

[ChiZZerS]

if you read on toole
he has finaly got it off

mario what the hell is a numpty you numpty

 

[Mario]

a numpty is a numpty plain and simple...

 

[F3Z]

im suprised i hav enever managed this thinking about it!

 

[Red_Merkin]

The truth is, Sam, you shouldn't laugh.
The other day i heard you telling Naill that you thought one of the dive tanks was full because it felt heavier than the others.

 

[Collier]

Originally posted by Red_Merkin
The truth is, Sam, you shouldn't laugh.
The other day i heard you telling Naill that you thought one of the dive tanks was full because it felt heavier than the others.

what's wrong with that?

Originally posted by Thordic
Using this formula:

Air has an average molecular weight of 29 (28 for N2*.8 + 32 for O2 * .2)
1 mole of gas at STP occupies a volume of 22.4 L, therefore, 29g {~1 oz)of air at STP occupies 22.4 L

Take you tank volume in Liters (ft3X28.3 or cu in X .0164) and correct to STP (forget the temperature, just multiply the volume by 204 or 306{3000psi/14.7psi; 4500/14.7psi}. This gives you the gas volume at STP.

Divide this volume by 22.4 and you get the weight of air in oz.

Using that, you get the following information:

3000 PSI = 204 atm
4500 PSI = 306 atm

47ci = 0.77 L
68ci = 1.11 L
88ci = 1.44 L
114ci = 1.87 L

So now, just plug it into what I said above, and you get these weights:

47ci 3000PSI tank: 7.0 ounces of air
68ci 3000PSI tank: 10.1 ounces of air
88ci 3000PSI tank: 13.1 ounces of air
114ci 3000PSI tank: 17.0 ounces of air

47ci 4500PSI tank: 10.5 ounces of air
68ci 4500PSI tank: 15.1 ounces of air
88ci 4500PSI tank: 19.7 ounces of air
114ci 4500PSI tank: 25.5 ounces of air

As you can see, the weight of compressed air is not negligible, especially in higher pressure setups.

Paul

 

[Red_Merkin]

ok paul, but can you tell the differnece between a full dive tank and an empty one just by picking it up?
cause if you can the guy down the dive shop could probably give you a job filling tanks on Saturday morning.

 

[sjt19]

Originally posted by Red_Merkin
ok paul, but can you tell the differnece between a full dive tank and an empty one just by picking it up?
cause if you can the guy down the dive shop could probably give you a job filling tanks on Saturday morning.

right then, i should give the guy at the dive shop a call to put my skillsto good use.

 

[Collier]

Originally posted by Red_Merkin
ok paul, but can you tell the differnece between a full dive tank and an empty one just by picking it up?
cause if you can the guy down the dive shop could probably give you a job filling tanks on Saturday morning.

lol like I need to fill dive tanks....

For the record no I can't but theoretically you could....



Paul