Does anyone have any idea where these engineers come up with the velocity limits? We have one that they are requiring a 10 PSI margin (not an issue since AHJ requires 20%), but also limiting velocity to FOURTEEN fps. There has never been a limit in NFPA 13. The velocity that we determine is only based on a demand calc. The water supply doesn't know to reduce flow so that a 10 psi margin is maintained. If a single sprinkler activates, that 1" arm over is going to see far greater than 14 fps.
It really just baffles me how this criteria has become so ingrained in the engineering culture. Please rate our customer service<https://survey.medallia.com/?emailsignature&fc=3539&bg=Fire%20and%20Fabrication> Travis Mack, CFPS, CWBSP, RME-G, COC, SET Senior Engineering Manager MFP Design 480-505-9271 ext. 700 C: 480-272-2471 [email protected]<mailto:[email protected]> www.mfpdesign.com<http://www.mfpdesign.com> Send large files to us via: https://www.hightail.com/u/MFPDesign<https://na01.safelinks.protection.outlook.com/?url=https%3A%2F%2Fwww.hightail.com%2Fu%2FMFPDesign&data=02%7C01%7C%7C1121d49f9e6b4cf248f108d4df580e77%7C14e5497c16da42e69ffa77d19bafe511%7C0%7C0%7C636379016677342180&sdata=eGdMZGu2wXhUupGwgGTrqF3b54OP5%2BAZvlHhABSexWY%3D&reserved=0>
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