Too bad they don't know why. If they did they would scootch it up a little-- something to hang their hat on AND say this is +/- X many percent conservative. I say vote the stodgy old TC members out-- we need some green--- any questions call me at BR 5- wtevr On Nov 5, 2016 5:09 PM, <[email protected]> wrote:
> Military (USACOE) still has 20fps for overhead pipe and 10fps for > underground > > > > Ed > > Aero > > > > > > *From:* Sprinklerforum [mailto:[email protected]. > org] *On Behalf Of *Todd Williams > *Sent:* Friday, November 04, 2016 4:30 PM > *To:* [email protected] > *Subject:* Re: velocity in pipes > > > > I see this every once in a while in engineer's specs. Most likely came > from the period when FM had a 20 fps restriction. > > Todd G Williams, PE > > Fire Protection Design/Consulting > > Stonington, CT > > 860-535-2080 (ofc) > > 860-608-4559 (cell) > > > > via Newton Mail > <https://cloudmagic.com/k/d/mailapp?ct=ti&cv=9.2.5&pv=9.3.5&source=email_footer_2> > > > > On Fri, Nov 4, 2016 at 7:25 PM, Gary Stites <[email protected]> wrote: > > San Jose (Do you know the way?) limits to 20 fps. Huge pet peeve of mine... > > > > https://www.sanjoseca.gov/DocumentCenter/View/7452 > > > > Gary > > > > On Fri, Nov 4, 2016 at 4:21 PM, Brad Casterline <[email protected]> > wrote: > > But as a bench mark, at 37 ft/sec is where Darcy-Weisbach starts exceeding > Hazen-Williams in psi/ft friction loss. > > Brad > > On Nov 4, 2016 6:03 PM, "Brad Casterline" <[email protected]> wrote: > > 2+2=4 > > Like Roland says ~velocity is self-limiting~ meaning you can get it going > as fast as the supply pressure allows. > The only "20" I have heard cities concern themselves with is city water > residual pressure in their pipes. > > Thanks for the nod Rocci :) > > brad > > On Nov 4, 2016 5:52 PM, "Rocci Cetani 3" <[email protected]> wrote: > > We have a situation where half of a building is exposed expanded plastics > on rack storage and the other half is storage on pallets of exposed > expanded plastics. With the pump we need the pipe is large on the rack side > (8” mains and 3” branchlines) on the pallet storage its 6” mains and I can > get down to 1.5” branch lines but it jacks the velocity up to around 30-35 > in the 1.5” pipe. I don’t believe NFPA has a standard on velocities in > pipes but I know a lot of cities don’t allow over 20 ft. per second. What’s > a good bench mark not to go above? I feel a Brad explanation coming with > lots of math……. > > Thanks in advance for all your answers. > > *Rocci Cetani III, **CET* > > *Designer* > > *Water-Based Fire Protections Systems Layout, Nicet Level III* > > *Northern California Fire Protection Services Inc.* > > 16840 Joleen Way Bldg. A > > Morgan Hill, CA 93037 > > P-(408) 776-1580 EXT.111 > > F-(408) 776-1590 > > [email protected] > > www.norcalfire.com > > CONFIDENTIALITY NOTICE: This message and any document accompanying it may > contain confidential information > > belonging to the sender. The information is intended only for the use of > individual or entity named above. If you are not the intended recipient, or > the employee or agent responsible to deliver this message to the intended > recipient, you are hereby notified that any disclosure, copying or taking > of any action in reliance on the contents of this information is strictly > prohibited. If you have received this transmission in error, please > immediately notify us by telephone to arrange for return of the documents. > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler. > org > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler. > org > > > > > > -- > > Gary Stites > > *805-769-GMAN* > > > > RLH <http://www.rlhfp.com> > > WWW.K25.Rocks > > Pandora Station <http://www.pandora.com/?sc=sh43464983213902734> > > > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler. > org > >
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