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$) > > > > 1041 East Butler Road Greenville, South Carolina 29606 > > > > CONTACT BY: Phone 1-864-676-5252, Email or MS TEAMS > > > > > > > > > > > > > From: Fpdcdesign <[email protected]> > Sent: Tuesday, June 24, 2025 10:45 AM > To: Sprinklerforum <[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) > > > > > > > > NOTICE - This communication may contain confidential and privileged > information that is for the sole use of the intended recipient. Any viewing, > copying or distribution of, or reliance on this message by unintended > recipients is strictly prohibited. If you have received this message in > error, please notify us immediately by replying to the message and deleting > it from your computer. > _________________________________________________________ SprinklerForum > mailing list: > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org > To unsubscribe send an email to [email protected] >
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