Does this only happen when you take the pump to 150%?
Christopher S. Wilson
Project Design Manager, SET
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(208) 872 1128<tel:(208)%20872%201128>
[email protected]<mailto:[email protected]>
Treasure Valley Fire Protection
A Pye-Barker Fire & Safety Company
2731 Saturn Way
Boise, ID 83709
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From: Fpdcdesign <[email protected]>
Sent: Tuesday, June 24, 2025 10:17 AM
To: Discussion list on issues relating to automatic fire sprinklers
<[email protected]>
Subject: [Sprinklerforum] Re: [EXTERNAL] Backflow turbulence
The water supply tested in the street to 38 psi with less than 5 ft elevation
to the pump room. The suction pressure they are getting during the pump test is
15
Todd Williams
Fire Protection Design/Consulting
Stonington, CT
860-608-4559
On Jun 24, 2025 at 11:39 AM, <Craig Prahl<mailto:[email protected]>> wrote:
Are suction pressures low due to the water supply? Since there is a BFP, I
assume you’re drawing from a city service, correct? Got any data on that
system?
Craig Prahl | Jacobs | Fire Protection SME – EV, AM, DC, Special Hazards
[email protected]<mailto:[email protected]> |
www.jacobs.com<https://urldefense.com/v3/__http:/www.jacobs.com/__;!!KZTdOCjhgt4hgw!-_khxU8gU0_6jc895I7kRbnU8JghRDsWgqOblZ4jr7Qp2IVbR30VYw_hWvNFtphnl0uWpB9KIvbYi1pvZz4$>
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From: Fpdcdesign <[email protected]<mailto:[email protected]>>
Sent: Tuesday, June 24, 2025 10:45 AM
To: Sprinklerforum
<[email protected]<mailto:[email protected]>>
Subject: [EXTERNAL] [Sprinklerforum] Backflow turbulence
I am working on an untestable fire pump with an “N” shaped RPZ in the suction
line. They (just) have the 10X diameter distance on the feed, but the suction
pressures are very low (15 psi). It seems that an “N” shaped device would
create a lost
I am working on an untestable fire pump with an “N” shaped RPZ in the suction
line. They (just) have the 10X diameter distance on the feed, but the suction
pressures are very low (15 psi). It seems that an “N” shaped device would
create a lost more turbulence than a standard straight one. Consequently,
should the distance of straight pipe requirement be greater for this
arrangement?
Todd G Williams, PE
Fire Protection Design/Consulting
Stonington, CT
860-535-2080<tel:860-535-2080> (ofc)
860-554-7054<tel:860-554-7054> (fax)
860-608-4559<tel:860-608-4559> (cell)
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