Compressed Air

Have u thought of using an old BBQ gas bottle? they are test to a much higher presure.
Cheers Andrew

they should handle at least twice their test pressure

Yes, have used one, worked very well, fitted a drain valve etc.

Hi Graeme,

First use, fill it till it splits, second use back off a bit!

Easy as!

Now for the sensible answer,

An operating pressure of 300psi and no internal corrosion will give you a huge safety margin at 80psi.

I'd just keep running it to 80psi and drain the condensate very regularly but I'm no expert on hydrostatic testing.

If you are really worried look up "Hydrostatic Testing" in the Yellow Pages and you'll find someone who will, if it passes, re-certify the cylinder for you.

Geoff,

Hi all

I have a dive tank, which is in survey, and holds 3,500 PSI, this will pump up a tyre from 12psi to 40psi in nine seconds, and is the safest way to go,,people look when i go to pump up the tyres when im down at the car park, after iv been to the beach, and out comes the "grab and go" pump up the tyres, and out of their,while they are still getting out the air hose and pump, you can also put a tyre back on the rim. and seven dollars to fill it up at the dive shop.

Cheers for now....William H...from...Bunbury...WA.

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A 9L water fire extinguisher is fine for an air tank. Mine uses an ARB diff lock cut off switch set at 90 PSI.
Cheers Craig...............

ARB Compressor and 5 Liter Extinguisher works fine for me!



You can see I fitted a tubeless tyre valve & stem to the shoulder of the extinguisher for filling!

The extinguisher was discharged, cleaned with the neck fitting removed, drilled, cleanbed again and the valve stem fitted!

Neck fitting re fitted and Air then plumbed from the tribber outlet to the vehicles plumbed air lines front and back etc.









Its admittedly a little "amateurish" in that it is all done with commoinly available garden variety harware fittings - but it works OK and inflates tyres in a reasonable time - allows me to run a rattle gun for the wheel studs in brief bursts if required changing a wheel etc - last of all replacement parts are easey to come by.

Call it the "McGuyver" Air solution...

ARB Compressor
Air Line
Extinguisher
Air snap locks
A lot of cable ties!

Others might do it differently - I seldom use it - and make sure no ones in the vehicle or immediate environs when I do, just in case something lets go!

80 psi is all you need!

Cheers

This does not really answer your question but I have seen a couple of air tanks used on 4wd's that came from a fireman's breathing setup. These tanks are a lot smaller and lighter then the normal scuba gear but have the same very high pressures.

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Graeme, I take it you are talking about the water filled stored pressure extinguisher tank. These are generally stainless and as you say tested to 300 psi, their normal pressure is about 120 psi.
The make excellent air receivers and being stainless don't rust. A drain would be good though to keep water out of the airline.
I have used one for years at the max pressure that a Big Red compressor can produce [about 90-100 psi].
They are far lighter than gas bottles also.

Ken

Sam, they are hanging off walls everywhere !!

Only joking, I got mine from a building being demolished and they are sometimes at Trash & Treasure markets.

Ken

Graeme, I have not tried to inflate a tyre from the tank, it would need a very high pressure to get in enough air for a 265-75 X 16 from flat .
I mainly use it for blowing up lilos etc, turn it on a few minutes before getting to camp and also to top up tyres after deflation. I use a Big Red compressor which has a reasonable output but nowhere near an airconditioner but while checking tyre pressure, putting on valve caps and moving to the next tyre it catches up.
I think you may have been trying to have something to use without a compressor [??] but I reckon you would need a tank that can operate at a very high pressure, way beyond what a servo compressor can put out.
There is a product called I think Easy Air which looks like a scuba tank but not cheap.

Regards,
Ken