Scuba tank filling question

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JRfiss

JRfiss

Member
Aug 28, 2015
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California, United States
Hmm, is my math off? I even used this http://www.calc.sikes.us/2/index.php

I have a Scuba tank 80CF @ 3k PSI and will be filling a 230cc (Hatsan Bullboss) based on the calculator above it says 0 fills. I get that 3k PSI output wouldn't be able to transfer 100% but I would think it be good for more than 0 fills? My assumption is it will fill to 2k or just above it and the rest would need to be pumped. 

I'm still shopping around for a 4500 setup, but dont think it will be here before my Bullboss. 

PS: Sorry, in a meeting and typically I would do some extensive research instead of just reaching out. 

Thanks in advance!

Ted
 
If you can get more than 1 tank you can do cascade filling. Let’s say you have 3 tanks filled to 3000. (If a tank is new I was told you can overfill by 10% ) Use tank #1 to fill to 2000 #2 2000 to 2500 and #3 2500 -3000. This system will allow you to do more rifle fills to the maximum required. Double check on the overfilling as I’m not sure if still applies to steel tank and aluminum or both this info I learned in the Navy and that was back in the 70’s.
 
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"Brian10956"If you can get more than 1 tank you can do cascade filling. Let’s say you have 3 tanks filled to 3000. (If a tank is new I was told you can overfill by 10% ) Use tank #1 to fill to 2000 #2 2000 to 2500 and #3 2500 -3000. This system will allow you to do more rifle fills to the maximum required. Double check on the overfilling as I’m not sure if still applies to steel tank and aluminum or both this info I learned in the Navy and that was back in the 70’s.
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The overfill of +10% only applies to tanks that have "(+)" stamped in the their neck. Here is an example of what to look for.
 
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"Brian10956"Again I’m not sure but I think a tank looses the + rating after the first 5 year hydro testing
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If you would have asked me, I would have agreed with Brian as stated above, but upon further research it seems to imply (I have not read the DOT regarding this issue) that if the hydro facility tests to the (+) rating they can re-certify the tank with a (+) sign along with the new hydro stamp, then the tank can be filled to 10% over the stamped rating of the tank for the next 5 years. The problem lies in that most hydro facilities will not bother with the "(+) test", therefore the tank is not certified to be filled beyond it's stamped fill pressure. This is what I understand from the research I have done on this subject. Hope it helps to clarify.

EDIT: It also appears that the (+) certification only applied to low pressure tanks, typically in the 2400psi range, not necessarily in the 3000psi range. I am still researching this. More later?

EDIT: last time I promise. I have tried to find the DOT that spells this all out and all I can find is reference to "49 CFR section 173.302a(b)" I have reviewed this document and I can't find anything conclusive here at this time. Not fully exhausted all options, but the wife unit is calling so I must go. I have found conflicting information, that states even if the Hydro facility does not stamp the (+) on the current hydro that the tank can still be over filled if it meets the REE requirements. So ?? that's all I got for now.
 
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The steel Faber scuba tanks i have an 80 and a 117 can be filled to 3442 psi. I have my own compressor, daystate 2, and fill them to 3200 each, and then cascade them for filling the Marauders. I found that they like about 2600 psi fills. I fill the scba to 4200 for the Armada, likes 2800 psi, and use the scba for all of my outside shooting. The scuba tanks are pretty heavy to be carrying around.
 
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