Theoretically that's true, but for a building under 75', even volunteer departments have adequate pumping capacity to make the standpipe work at the top-most connections.
Remember that the prescriptive pressures may be inadequate for some FD standpipe kits and way more than adequate for others. If a department uses small (1½" or 1¾") hose packs for attack, you might need 125 PSI or more at the hose connection to make it work, depending on make/model of nozzle at the tip. If the attack line is 2½" + sections of 2" with a smooth bore nozzle, you might only need 55-60 PSI at the hose connection. It's incumbent on the FD to know what their equipment can pump and harmonize their operational strategies and equipment to the limits of their capabilities. We generally talk about zones beyond the capacity to pump in terms of very tall buildings. (Sidebar, this was a REALLY big topic of discussion at the 2nd Draft meeting last week.) So theoretically, an under-resourced brigade or department could have very limited pumping capability, but if they're using large diameter hose and fixed bore nozzles, it never manifests. All of this adds up to one incredibly important step in the design process; I've been harping on it for years and now it's actually codified. If you are not already familiar with the practices and policies of the serving fire department in a particular area, consult with them to affirm what pressure they want to pump and what pressure they need at the remote hose connection, especially if it's outside of the prescriptive design criteria in NFPA 14. The foregoing is my opinion only and does not represent NFPA or the NFPA 14 Technical Committee, nor intended to serve as an interpretation of the standard. Protection Design and Consulting Steve Leyton, President T | 619.255.8964 x 102 | www.protectiondesign.com<http://www.protectiondesign.com/> 2851 Camino Del Rio South | Suite 210 | San Diego, CA 92108 Fire Protection System Design | Consulting | Planning | Training From: Prahl, Craig/GVL <[email protected]> Sent: Wednesday, May 25, 2022 7:52 AM To: Brian Harris <[email protected]>; [email protected] Subject: [Sprinklerforum] Re: Manual Standpipes Its requirements can't exceed the capabilities of the local fire department apparatus. Craig Prahl | Jacobs | Group Lead/SME - Fire Protection | [email protected]<mailto:[email protected]> | www.jacobs.com<http://www.jacobs.com/> 1041 East Butler Road Greenville, South Carolina 29606 CONTACT BY: email or MS TEAMS From: Brian Harris <[email protected]<mailto:[email protected]>> Sent: Wednesday, May 25, 2022 10:45 AM To: [email protected]<mailto:[email protected]> Subject: [EXTERNAL] [Sprinklerforum] Manual Standpipes Other than the flow & pressure requirements for the top connections are there any limitations (number of stories) for a manual standpipe? Brian Harris, CET BVS Systems Inc. Design Manager bvssystemsinc.com<https://urldefense.com/v3/__http:/bvssystemsinc.com/__;!!B5cixuoO7ltTeg!CpY_P9C1_iLeDruwIujHdk-1dSbrW_DKBvf68tPGXaStBHsFXHEd88vJsMdjolkUZwIPqwBBa7KOidBiVOabtDb0$> Phone: 704.896.9989 Fax: 704.896.1935 ________________________________ 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.
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