It's because they have velocity limits when sizing heating and water lines and can't wrap their heads around sprinkler hydraulics. when you have constant water flow through piping, high velocity wears the pipe out faster, somehow they translate that to sprinkler pipe failure even though sprinkler pipe rarely even sees any water flow!
Thanks Brett Peters General Manager Installation & Design Proudline Fire Protection Services Ltd. [email protected] 780 490 7602 office ext 202 780 490 7605 fax 780 777 0568 cell 780 718 2676 24h Visit us at www.proudline.ca On Mon, Mar 14, 2022 at 1:50 PM <[email protected]> wrote: > 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] > > 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> > > > SprinklerForum mailing list > [email protected] > https://lists.firesprinkler.org/list/sprinklerforum.lists.firesprinkler.org
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