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post #61 of Old 02-01-2013
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Re: DIY - discussion on building a DIY hookah diving compressor

My concern would be the 17.4 psi limitation. Standard air pressure is 14.7 psi. At a depth of 10 feet, the water pressure is 1.3 atmospheres, or about 19.1 psi. So this compressor cannot even pump air down 10 feet underwater, let alone get enough volume down to a diver that deep.

And then, is the flow rating at the full 17.4 or is that "free flow." A lot of compressors, in order to "pump up" their numbers, will list free flow volume and maximum psi, and not mention that at maximum psi the flow is going to be WAAAAY less.


Oops! Just realized that my math is wrong. I was including the 1 atmosphere of pressure that we start with at sea level. So, if this thing can pump 17.4 psi then it can pump air down almost 40 feet. The question remains, though, if it will actually deliver the full flow at that depth.

And then, most of the regulators that I've seen that are made for hookah diving are adjusted to work with 40-60 psi of delivered air pressure. "Normal" scuba regulators work with around 100 psi of delivered air pressure. Obviously, these regulators would not work with that compressor, which may be why the ebay sellers plumb it to a snorkel, instead of a real regulator.

Last edited by denverd0n; 02-01-2013 at 02:46 PM.
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