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Old 08-08-2013, 07:56 PM   #1
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SCUBA Tank for Air Storage

I've been wondering about something so here it is.

A standard SCUBA tank holds 80cuft of air at 3000 psi. How far could the compressor on our truck's compressor fill this tank, psi wise?

I know the dash gauge shows what the existing tank has in it but that doesn't mean the compressor isn't capable of more pressure.

I'm thinking of mounting a SCUBA tank on my truck as an air storage device for things like running tools, filling tires, etc. Put a regulator on it and 80cuft lasts a long time.

The average diver gets between 30 min and and hour of diving time from one of these.
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Old 08-08-2013, 08:00 PM   #2
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Cut out on most air suspension systems is 120 psi. That's a LONG ways from 3000 psi!
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Old 08-09-2013, 08:36 AM   #3
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The compressors which can get to 5,000 psi to fill scuba tanks are multistage and cost from $4-8,000 bucks.
There is a product on the market (somebody improve my memory) for filling tires, etc. which is a portable cylinder and holds high pressure air.

hjs
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Old 08-09-2013, 08:48 AM   #4
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Scuba do

There are blogs, at least on Wrangler Forum or Jeep Forum about converting Scuba tanks for portable air. The HP tanks are very popular for the off road crowd to air up big tires after they lowered them to OffRoad. As I recall there are a few problems using scuba tanks in adapting the fittings and then getting someone to fill an old scuba tank if it in't tested. I also heard that scuba tanks have to be filled by certified machines to prevent contamination and that might get costly. There is a vendor that sells portable air tanks resembling scuba tanks that advertises in Motorhome magazine.
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Old 08-09-2013, 08:48 AM   #5
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They make portable air tanks. Check a local auto parts store. You won't have to fool around figuring out how to plumb it.
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Old 08-09-2013, 08:49 AM   #6
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I'm a retired Scuba Instructor and Cylinder Inspector Instructor. There are several challenges about carrying a Scuba cylinder. Firstly, as HJS said, compressors are expensive (and heavy). An alternative is to get the cylinder filled at a dive store, but they will want to see a Scuba certification card. A few stores do work with paintballers who use bulk cylinders to fill their guns but that is very rare. Scuba cylinders require an annual visual inspection by a certified inspector, costing around $30, and a hydrostatic test every five year at $50 to $60. And then you will need a regulator to reduce 3,000psi to 140 or so. Connecting a Scuba cylinder directly to a tire would result in a very loud boom.
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Old 08-09-2013, 09:59 AM   #7
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Thanks folks. I was mainly curious about whether the compressor could do the job.
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Old 08-09-2013, 10:26 AM   #8
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I did just this. As mentioned you will need a typical SCUBA primary regulator, then with a standard tire valve inflator device. I also had a straight air tip for blowing out my electronics as SCUBA air de-humidified (dry).

Refills were not a problem for me as I worked for a FD and had access to a multi-stage / three phase breathing air compressor, and was the Department's dive team coordinator. Air in the 3300 psi super 80 cf tank would last a LONG time!
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Old 08-09-2013, 04:58 PM   #9
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I use a Powertank with my Jeep.It works GREAT for filling large tires fast. Nothing is better, really. I also use it on my RV and for running air nailers, etc. I have the 15lb one, but the 20 would be my choice were I to do it over. I have them filled at places like AirGas for around $20-25. If I'm just using it for RV stuff once a year is about right.
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Old 08-09-2013, 05:43 PM   #10
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Is there an issue for onboard storage and safety precautions?

A USN O2 cylinder fell over on the flight line in 1970. Broke the nozzel off and it flew up through an aircraft wing, flew like a missle across the field, and killed two jet mechs.

Just wondering
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Old 08-09-2013, 10:23 PM   #11
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Quote:
Originally Posted by CampDaven View Post
Is there an issue for onboard storage and safety precautions?

A USN O2 cylinder fell over on the flight line in 1970. Broke the nozzel off and it flew up through an aircraft wing, flew like a missle across the field, and killed two jet mechs.

Just wondering
When I was a frequent diver, I carried an average of 9 tanks varying in size from 80cuft to 130cuft in my truck. Always carried them horizontal and strapped down tight with the valve pointing away from the cab and nothing near them. Rest of dive gear was on the other side of a partition.
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Old 08-10-2013, 07:05 AM   #12
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Short answer is no, you might get 200 PSI out of the on b oard compressor but if you try for 1,000 something is going to go BOOM.
'
Now that is if you are simply using it to store air for things like inflating tires.

If you are planing on BREATHING the air in that tank, also a bad idea as the engine compressor is not rated for breating air.
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Old 08-11-2013, 12:26 AM   #13
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Like jack I use a (co2) tank for my bronco
Out on the trail.
Power tanks like his are nice but pricey.
I use a standard contractors co2 tank that
Like he said can be re filled at any welding
Supply store. 15 ga tank with 99 year lease cost
$100. Plus $25 for bottle exchange.

And your truck will only give you about
120lbs
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Old 08-13-2013, 10:55 PM   #14
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Quote:
Originally Posted by hjsdds View Post
The compressors which can get to 5,000 psi to fill scuba tanks are multistage and cost from $4-8,000 bucks.
There is a product on the market (somebody improve my memory) for filling tires, etc. which is a portable cylinder and holds high pressure air.

hjs
Yep, the PowerTank is a great way to go; mine lasts a full year (usually), will top off at the end of our travel season -- $20, brings it up to 35# (gross), to carry 15# of co2... this was the larger of the two sizes offered back in '07 when Mike McFall brokered the deal.

Jack is more of a heavy user than me; for my "lightweight" use (RV, truck & bicycle tires), I could have opted for the smaller, 10# unit and woulda been just fine (and it's about 10# lighter, and shorter than the 15# unit).

I took delivery from the distributor (Bob) in Sacramento, CA... still have his number.

-Don
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