SCUBA Tank Hose Adapter

Old 12-16-15, 01:58 PM
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SCUBA Tank Hose Adapter

What fittings / adapters / hoses are needed to adapt a 80cf SCUBA tank for blowing out lines? Years ago, while working at an HVAC company, guys had these setups. I have two SCUBA tanks on hand and would like to use them.
Old 12-16-15, 07:20 PM
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For blowing out what lines ?
Old 12-16-15, 07:32 PM
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That just makes no since to me.
I was hoping some of the HVAC guys would see this and jump all over it.
Unless those tanks where filled with nitrogen and not compressed air.
Old 12-17-15, 02:32 AM
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You would expect an HVAC guy to use compressed air to blow out dusty coils and drain lines, not sealed refrigeration systems.
I use CO2 for what you describe which is at 600 psi in the cylinder.

For a scuba tank you would need a high pressure regulator rated for whatever pressure the scuba tank operated at, normally around 2200 psi with the correct adapter to fit the tank.
A nitrogen rated regulator would work fine.
You could use an air line quick connect on the outlet of the regulator to connect an air line.

A diving shop should be able to supply the correct tank adapter.
Old 12-17-15, 04:43 AM
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Even with the other end of a tube or pipe open you run the risk of bursting the pipe if you hit it with 2 or 3'000 psi air from a SCUBA tank. Most copper tubing like used in refrigeration has a max rating of less than 1'000 psi and if you're blowing out water lines some of them are rated for less than 200 psi. It might be a viable option if you have a primary regulator on the tank but then you'll be limited by flow volume. Better might be to use a traditional air tank with a valve you can open wide for good flow.
Old 12-17-15, 04:35 PM
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The first stage of a (proper) scuba regulator will drop the pressure from 3000psi down to about 100.

You need to check your local codes on filling and testing scuba tanks though. Here in Canada anyway it wouldn't be worth it because of the expense involved in maintaining, filling and certifying the tank.

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