Help me identify steel tank manufacturer

[ECUPirate]

I have acquired a tank very similar to the dimensions mentioned above. Coyne LP Steel (3AA) 23.8 inches tall by 8 inch diameter. The original date stamp is from 9/93 with a + rating. Does that mean this is an 80cf tank when filled to 2400psi and 97cf at 2640psi? I ask because when I got a hydro done a few weeks back they did not give me + on the new date. So I guess this will be getting filled to 2400 going forward. So is it an 80cf tank?

 

[Couv]

Take the known volume when full and divide by the full pressure to get a constant.
Then to find the volume at a different pressure, multiply the constant times that pressure.

97/2640 = 0.0367... (97 cu ft when full, divided by the pressure when full gives your constant, 0.0367)
0.367... X 2400 = 88.18...

So your 97 cu ft tank has 88 cu ft (plus a little bit) @ 2400psi

 

[05sportsman]

Taylor Wharton is still in business. They actually make the calibrated cylinders that hydro shops calibrate off of.

 

[ECUPirate]

Take the known volume when full and divide by the full pressure to get a constant.
Then to find the volume at a different pressure, multiply the constant times that pressure.

97/2640 = 0.0367... (97 cu ft when full, divided by the pressure when full gives your constant, 0.0367)
0.367... X 2400 = 88.18...

So your 97 cu ft tank has 88 cu ft (plus a little bit) @ 2400psi

I guess what I am trying to determine is what to use for my SAC calc. I use Oceanic Dive Log (not a big fan but it is what works with my computer) and need to add the cylinder for it to make the calculation. Is there any way for me to confirm the 88 cu ft at 2400?

 

[Jimmer]

I guess what I am trying to determine is what to use for my SAC calc. I use Oceanic Dive Log (not a big fan but it is what works with my computer) and need to add the cylinder for it to make the calculation. Is there any way for me to confirm the 88 cu ft at 2400?

Any chance you have access to a transfill whip and another cylinder of a known size? If so it's pretty easy.