Compressor for USUN
- Thread starter Tecdiverfl
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Hard to say. Donor/recipient pressures and sizes make it variable. My opinion based on owning the same booster is mostly "no".
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It is nowhere near enough, but it is less bad than what you have. Officially they say 5.5-7.5hp to attempt to keep up so if you ran both together it would be close but they can pull up to 70cfm if you are cycling them at 1 cycle/second so you'll never realistically be able to keep up with them. Doesn't affect their ability to boost, just tries your patience for how long you're willing to wait to boost...
Trimixdivin
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how big of a compressor are you using?
Its not the size of the tank that matters, but the CFM the compressor puts out. I'm limited by the electrical service to my garage, so I'm running mine off a pair of California Air Tools 4620AC which have tiny little tanks, but put out 5.3 CFM. I find this to be plenty for filling rebreather bottles, and the pair let me alternate between compressors to stay within the duty cycle when filling doubles or bailouts.
A sanborn 3hp 20gal (9cfm@40psi) daisy chained with a cheap crap harbor freight 30 gal. With a bunch of cooling pipework and dessicant. After that all burned in a house fire, I just keep a couple of LP108s filled and use those.
5hp would probably be OK with a big tank. If I was ever to rebuild the shop air again id just use a 100gal propane tank.
5hp would probably be OK with a big tank. If I was ever to rebuild the shop air again id just use a 100gal propane tank.
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tank size is largely irrelevant for something like this. All it will do is minimize the pressure drop when the unit cycles *which is in fact a good thing* but the tanks are great when you have dynamic loads with super high draw like an air impact gun but with a booster it is a constant load so you will never be able to "catch up" once the pressures equalize.
broncobowsher
Contributor
Also look at duty cycle. Most of the cheap compressors will not survive long duty cycles. I have an IR compressor that is rated for 100% duty cycle. That is I could run it non-stop (use so much air it never cycles off) and it doesn't care. I think the worst I have seen was hidden was in the warranty material. 10% duty cycle was the limit, and the warranty was void if you used it for more than 6 minutes (compressor run time) in a 1 hour period.
When shopping HP, most will advertise a BS "peak" number. Good ones will advertise a "running" HP number. But in the end it is CFM that matters. And even that gets into BS numbers. The standard is at 90PSI. But some will use a 40PSI number to inflate the CFM numbers. Not sure what pressure you are driving into the Usun, but my Haskel likes 150PSI to get the final top pressure that I want.
When shopping HP, most will advertise a BS "peak" number. Good ones will advertise a "running" HP number. But in the end it is CFM that matters. And even that gets into BS numbers. The standard is at 90PSI. But some will use a 40PSI number to inflate the CFM numbers. Not sure what pressure you are driving into the Usun, but my Haskel likes 150PSI to get the final top pressure that I want.
broncobowsher
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There is one good thing with bigger tanks size. But as you mention it isn't related to continuous loads.
The benefit is the larger surface area helps cool the air. Cool air drops moisture better. A small tank will run hotter than a large tank for the same airflow.
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