Wow, I've never seen lower than 20 for overhead piping. Even FM has basically thrown out velocity limits, I've already done a job over 32 fps using Darcy Weisbach per their requirements. Didn't even come up in the review letter.
Mike Morey CFPS 3229 * NICET S.E.T. 123677 Project Manager * Fire Protection Group Shambaugh & Son, LP an EMCOR Company 7614 Opportunity Drive * Fort Wayne, IN * 46825 direct 260.487.7824 / cell 260.417.0625 / fax 260.487.7991 email [email protected] [cid:[email protected]] From: [email protected] <[email protected]> Sent: Monday, March 14, 2022 3:49 PM To: [email protected] Subject: [Sprinklerforum] Velocity - Rant 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 ZjQcmQRYFpfptBannerStart This Message Is From an External Sender This message originated outside your organization. ZjQcmQRYFpfptBannerEnd 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://urldefense.com/v3/__https:/survey.medallia.com/?emailsignature&fc=3539&bg=Fire*20and*20Fabrication__;JSU!!FaxH778!Ix1k3ExMe57Ajx4Iy97I5daw5hggfupSm6Kov7IIVKPPC7cJPcEg_DTVH9UoZKJ9$> Travis Mack, CFPS, CWBSP, RME-G, COC, SET Senior Engineering Manager MFP Design 480-505-9271 ext. 700 C: 480-272-2471 [email protected]<mailto:[email protected]> www.mfpdesign.com<https://urldefense.com/v3/__http:/www.mfpdesign.com__;!!FaxH778!Ix1k3ExMe57Ajx4Iy97I5daw5hggfupSm6Kov7IIVKPPC7cJPcEg_DTVH3i_3L_x$> Send large files to us via: https://www.hightail.com/u/MFPDesign<https://urldefense.com/v3/__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__;JSUlJSUlJSUlJSUlJSU!!FaxH778!Ix1k3ExMe57Ajx4Iy97I5daw5hggfupSm6Kov7IIVKPPC7cJPcEg_DTVH03ReA3W$> This message is for the named person's use only. It may contain confidential, proprietary or legally privileged information. No confidentiality or privilege is waived or lost by any mistransmission. If you receive this message in error, please immediately delete it and all copies of it from your system, destroy any hard copies of it and notify the sender. You must not, directly or indirectly, use, disclose, distribute, print, or copy any part of this message if you are not the intended recipient.
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