That makes sense.  We’ve had a few AHJs that have made us flow one of these
in conjunction with the overhead system.  There is just no criteria by the
manufacturer on how it is supposed to go.  That is where the challenge
comes.

 

 <http://www.mfpdesign.com/> 

Travis Mack, CFPS, CWBSP, RME-G, SET

MFP Design, LLC

3356 E Vallejo Ct

Gilbert, AZ 85298

480-505-9271

fax: 866-430-6107

 <mailto:tm...@mfpdesign.com> tm...@mfpdesign.com

www.mfpdesign.com

 

Send large files to us via:
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“The bitterness of poor quality remains long after the sweetness of low
price is forgotten.”

 

 

From: Kyle.Montgomery <kmontgom...@aerofire.com> 
Sent: Wednesday, August 14, 2019 3:27 PM
To: sprinklerforum@lists.firesprinkler.org
Cc: Travis Mack, SET, CFPS, CWBSP, RME-G <tm...@mfpdesign.com>
Subject: RE: [EXTERNAL] Captive Aire Systems

 

I’ve always been under the impression that these are treated separately from
the overhead sprinkler system, i.e. either the fire is in the hood and
controlled by the hood system, or it is outside of the hood and controlled
by the sprinkler system. I’ve never considered them as working in
conjunction with each other.

 

The only time I’ve ever really done anything other than provide an outlet to
connect to was when some of the systems had a maximum working pressure that
was lower than the system operating pressure, so we had to provide a
pressure-reducing valve on the feed and guarantee that the system could
provide flows/pressures within a certain range.

 

I’m definitely not an expert though.

 

-Kyle M

 

From: Sprinklerforum [mailto:sprinklerforum-boun...@lists.firesprinkler.org]
On Behalf Of Travis Mack, SET, CFPS, CWBSP, RME-G via Sprinklerforum
Sent: Wednesday, August 14, 2019 3:20 PM
To: sprinklerforum@lists.firesprinkler.org
<mailto:sprinklerforum@lists.firesprinkler.org> 
Cc: Travis Mack, SET, CFPS, CWBSP, RME-G <tm...@mfpdesign.com
<mailto:tm...@mfpdesign.com> >
Subject: [EXTERNAL] Captive Aire Systems

 

I’m sure some of you have dealt with these Captive Aire / Piranha systems.
Basically they are hood systems that connect to the sprinkler system.  The
one I have a data sheet for has an operating pressure of 32-70 psi and flows
vary depending on # of nozzles.  How do those of you dealing with these
handle them?  The supplier will not do any calculations for the system.  My
question is, do we treat these like a “rack” system and balance the hood
systems to the overhead?  If I have a kitchen with 3 of these, do I figure
0, 1, 2 or 3 flowing simultaneously with the overhead.  As you can imagine,
a standard sprinkler in the kitchen is ±10 psi.  Now, if we have to treat
this like a rack system and balance at the junction point, this 30 psi for
the Piranha system will significantly over-discharge the sprinklers leading
to a much larger kitchen demand.  These often seem to be brought up toward
the end of the project leaving everyone scrambling.

 

What has the collective group been doing with these things?

 

 
<https://urldefense.proofpoint.com/v2/url?u=http-3A__www.mfpdesign.com_&d=Dw
MFAw&c=wn3mZQLIuInh2ClcJ0_DIA&r=Z_2A85VL7AQzoqudh6uOyS3bn8etxB7nLN8OBJwQd9A&
m=55nTB_SIg__k7Xnu85uW2LcHH_p321dxRfEw3_AchjM&s=2AEk_CaWT5zGUOwFtrdm1vOavnvL
eo3liS6IicLZu98&e=> 

Travis Mack, CFPS, CWBSP, RME-G, SET

MFP Design, LLC

3356 E Vallejo Ct

Gilbert, AZ 85298

480-505-9271

fax: 866-430-6107

 <mailto:tm...@mfpdesign.com> tm...@mfpdesign.com

www.mfpdesign.com <http://www.mfpdesign.com> 

 

Send large files to us via: https://www.hightail.com/u/MFPDesign 

LinkedIn: https://www.linkedin.com/in/travismack

 

“The bitterness of poor quality remains long after the sweetness of low
price is forgotten.”

 

 

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