Type of compressor 2

[GregLocock]

I need to reduce the air pressure in a leaky chamber.

The flow rate is 3700 cfm, and the pressure drop is just under 1 psi.

I have found a centrifugal blower that will manage that, but was wondering whether there are any axial solutions that spring to mind, as my customer would prefer an axial system. I gather that 1 psi is too much for a fan as such.

Overall diameter is an issue, which is another reason why the centrifugal blower is not preferred. In an ideal world 14" OD, I suppose 20" might be acceptable.

Cost is not really an issue (yet).



Cheers

Greg Locock

SIGlease see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[MintJulep]

A vaneaxial blower should be able to easily handle that.

http://www.tcf.com/tcfblower/pdfs/TCBUAX100.pdf

to get you started. The sample is belt driven, but they will also be available direct driven with the motor in-line if that is what you need.

 

[GregLocock]

Yes, I'd love to use something like that. Unfortunately they don't deliver the delta p I need, around 21" wg (ie 0.75 psi).



Cheers

Greg Locock

SIGlease see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[MintJulep]

I didn't catch psi in your first post, sorry.

Yeah, you're looking a centrifugal most likely.

If you've got length, a couple vaneaxials in series could get there.

 

[gepman]

I think that you probably have the best solution in a centrifugal. I have attached a pdf on regenerative blowers. Page 12 gives a handly flow vs pressure chart showing the most likely appropriate technology.

 

[DrRTU]

Standard off the shelf axial fans have a limit of about 4”to 6” delta p. Multiple fans in series could work, but you may get unstable during start-up / shutdown. You could find a custom manufacture to build a multi-stage axial blower but it would get costly for this smaller flow. If you are working with air at STP then you should be looking into a centrifugal fan. Hartzell has a turbo fan that could work.

http://www.hartzellfan.com/products/type_moreinfo.php?id=92

 

[GregLocock]

Yes, Hartzell's definitely getting into the ballpark. I'll work through the dimensions for those.

I didn't have much luck with the regenerative blowers, so far. Most seem to be 1-5 hp jobbies, not 30+.

Does anyone have a suggestion for a manufacturer for a multistage axial setup, say 20 units per year? I'm sure we'll take an efficiency hit from an axial system, but that may be an acceptable tradeoff.





Cheers

Greg Locock

SIGlease see FAQ731-376 for tips on how to make the best use of Eng-Tips.

 

[DrRTU]

Look into the Spencer line. They make a nice regen unit that could be manifolded into a compressor skid. They make multistage units but I never have used them.

http://www.spencerturbine.com/produ...e-fabricated-centrifugal-blowers/default.html

 

[GregLocock]

Ah, I'm glad you came up with Spencer, they had a good website and I was going to ask about them.



Cheers

Greg Locock

SIGlease see FAQ731-376 for tips on how to make the best use of Eng-Tips.