George, what did you mean by "Don't think you'd have a need to provide positive suction head at 150%." Doesn't NFPA #20 5.14.3.2 require it to stay above 0 (or -3 for tanks) while flowing 150%?
On Tue, Jun 7, 2011 at 10:43 AM, George Church <[email protected]>wrote: > It may- its been 10 years+ since they let me run HydraCAD back there. > Did you call NH and ask em? > One of the strengths they offer is someone who understands the program > answering your call. > You could pretend the tank is a piece of UG and is the incoming supply- set > your flow test up to be 10,000 GPM at .5 PSI or 0 PSI > Run it thru the UG including the slop you need to get positive head > exceeding the friction loss in the supply piping > Ignore the warning of low suction- > Check result for positive pressure to the fire pump at system demand. Don't > think you'd have a need to provide positive suction head at 150%. > > > George L. Church, Jr., CET > Rowe Sprinkler Systems, Inc. > PO Box 407, Middleburg, PA 17842 > 877-324-ROWE 570-837-6335 fax > [email protected] > > > > -----Original Message----- > From: [email protected] [mailto: > [email protected]] On Behalf Of Ralphy Henderson > Sent: Tuesday, June 07, 2011 1:00 PM > To: [email protected] > Subject: RE: Pump, Tank, 1000 ft suction line..... > > No, I don't need a PC to do the calc but I'd like for hydra calc to show > all this w/o an additional set. Things like that tend to confuse the AHJ's - > especially hand written things. You would think a multi thousand dollar > program would be able to take the calc from a tank to the pump and to the > system in one report - but it looks like that's not the case. > > > > > > > > --- On Tue, 6/7/11, George Church <[email protected]> wrote: > > From: George Church <[email protected]> > Subject: RE: Pump, Tank, 1000 ft suction line..... > To: "[email protected]" <[email protected]> > Date: Tuesday, June 7, 2011, 4:47 PM > > Why not take a piece of paper, write down the length of the run, multiply > it by the FL/ft, and use a calculator to multiply the two and get the > friction loss? > Then correct for any dif in elevation by multiplying the dif x .433. > It really isn't that hard and you really don't need a pc to run a simple > supply calc. > > Ok, maybe I should say you SHOULDn'T need a pc.... > > > George L. Church, Jr., CET > Rowe Sprinkler Systems, Inc. > PO Box 407, Middleburg, PA 17842 > 877-324-ROWE 570-837-6335 fax > [email protected] > > > > -----Original Message----- > From: [email protected] [mailto: > [email protected]] On Behalf Of Ralphy Henderson > Sent: Tuesday, June 07, 2011 12:29 PM > To: [email protected]; [email protected] > Subject: RE: Pump, Tank, 1000 ft suction line..... > > Bob, > > That's kind of what I was getting at. I'll probably just have to submit a > separate calc showing the 150% pump rating through the pump to the tank to > prove the losses are acceptable. Does anyone know if there is a way to do > this in a single calc in hydracalc? I can put in an additional water > 'source' but then would have to enter in a static, res, and flow for the > tank to get it to run through the program and these numbers are unknown > (except for static). > > Thanks, > > RB > > > --- On Mon, 6/6/11, Bob <[email protected]> wrote: > > From: Bob <[email protected]> > Subject: RE: Pump, Tank, 1000 ft suction line..... > To: [email protected] > Date: Monday, June 6, 2011, 11:05 PM > > Ralph, > Looking at this I'm coming up with 20.3 psi loss in 1000' of pipe not > counting fittings and valves. > (4.52*1000.00^1.85)/(140^1.85*6.4^4.85) = .0203 .0203 * 1000 = 20.3. 6.4" > is ID of 6" Tyton Joint Pipe DI. Fittings and valves will increase your > losses. At 1500 gpm you will have .43 psi / ft loss. These numbers will > vary depending on pipe type and ID. As far as how to do it; I think I would > simply run the numbers through the calculation back to the tank. Or better > yet, if there are hydrants fed off of the tank have a flow test performed > and calc back to that point of connection. > > Bob Knight, CET III > 208-318-3057 > www.firebyknight.com > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Vince > Sabolik > Sent: Monday, June 06, 2011 4:37 PM > To: [email protected]; [email protected] > Subject: Re: Pump, Tank, 1000 ft suction line..... > > Ralph - > > My rough calcs say about 16 psi loss at 100% flow and 34 psi loss at 150% > flow. > Unless this is an elevated tank, or your source is uphill from the pump, > this won't work. > > At 06:32 PM 6/6/2011, you wrote: > >at 1000 gpm, you are going to lose about 2 psi per 100' of 6" > >ductile iron pipe. At 1500 gpm, you are going to lose about 5 psi / > >100' of DI pipe. You need to have enough elevation between the tank > >and pump to provide a positive pressure at the suction flange. > > > >On 6/6/2011 3:28 PM, Ralphy Henderson wrote: > >>Hi All, > >> > >>Can someone explain to me how one would go about calculating a fire > >>pump being fed solely from a water storage tank but with a 6" x > >>1,000 ft suction line? I've calculated fire pumps off of tanks that > >>had a small 10 ft. suction lines directly off the tank but never one > >>with this amount of underground line and I'm concerned about making > >>sure friction losses in the suction are properly accounted for. The > >>pump is 75 psi @ 1000 gpm. > >> > >>We use hydracalc, and typically when a fire pump and tank scenario > >>comes up we have only one 'source', the pump, being specified. > >>Would this change in this instance? I guess the main thing I'm > >>concerned about is coming up with a negative pressure at the suction > >>flange due to such a long run. > >> > >>Any help? > >> > >>-RB > >> > >>_______________________________________________ > >>Sprinklerforum mailing list > >>[email protected] > >>http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > >> > >>For Technical Assistance, send an email to: [email protected] > >> > >>To Unsubscribe, send an email > >>to:[email protected] > >>(Put the word unsubscribe in the subject field) > >_______________________________________________ > >Sprinklerforum mailing list > >[email protected] > >http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > > >For Technical Assistance, send an email to: [email protected] > > > >To Unsubscribe, send an email > >to:[email protected] > >(Put the word unsubscribe in the subject field) > > > >__________ Information from ESET NOD32 Antivirus, version of virus > >signature database 6185 (20110606) __________ > > > >The message was checked by ESET NOD32 Antivirus. > > > >http://www.eset.com > > > > > > Vince Sabolik > Christi Fire Protection, Inc. > 11351 Pearl Road > Strongsville, Ohio 44136 > > T 440 572-7730 F 440 572-7719 Email: > <mailto:[email protected]>[email protected] > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (Put the word unsubscribe in the subject field) > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (Put the word unsubscribe in the subject field) > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (Put the word unsubscribe in the subject field) > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (Put the word unsubscribe in the subject field) > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (Put the word unsubscribe in the subject field) > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (Put the word unsubscribe in the subject field) > _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
