There are times when you can't get an exact measure and you have to make assumptions. That's why you don't calc systems to within 1 psi between demand and available.
Craig L. Prahl, CET Fire Protection Group Mechanical Department CH2MHILL Lockwood Greene 1500 International Drive PO Box 491, Spartanburg, SC 29304-0491 Direct - 864.599.4102 Fax - 864.599.8439 [EMAIL PROTECTED] http://www.lg.com -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of danarbel Sent: Wednesday, February 13, 2008 11:24 AM To: [email protected] Subject: RE: C-Factor for old piping Do you always test a Hydrant next to the Riser? If you do that, that is fine. Or you perform test some distance away and make assumptions that the pipe connecting between the point of test and the riser including the service connection, water meter, backflow, filter will all follow Mfg data and H-W formula with C factor 120? Or you have an old main and you install a pump house some distance from the risers and assume that the pipe will follow H-W formula with C factor 120? . These are all assumption. Dan Arbel Tel: 972-4-8243337 Fax: 972-4-8243278 M: 972-52-2810593 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of ?... .... Sent: Wednesday, February 13, 2008 4:34 PM To: [email protected] Subject: C-Factor for old piping i may not be following your point, but if you are concerned that the actual C-factor of old UG pipe is less than the idealized C-factor what does it matter as long as you take your source where ever your gauge hydrant is? the waterflow test will account for any aging in the pipes, automatically. it is another thing, to extend this thinking, downstream of the guage hydrant though. There you will need professional judgement to bring value engineering. scot deal excelsior fire On Feb 13, 2008 1:19 PM, danarbel <[EMAIL PROTECTED]> wrote: > > > According to 22.4.4.7 Friction Loss, The C-Factor used for black steel > pipe is 120. > > My question is: > > In case of using old pipe system Mains for water supply of sprinkler > system, > > > Is there in the code any requirement to find out by actual testing > that the piping determined as adequate by the hydraulic calc procedure > is indeed adequate? > > Thanks > > > Dan Arbel > Tel: 972-4-8243337 > Fax: 972-4-8243278 > M: 972-52-2810593 > > No virus found in this outgoing message. > Checked by AVG Free Edition. > Version: 7.5.516 / Virus Database: 269.20.4/1275 - Release Date: > 12/02/2008 > 15:20 > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > To Unsubscribe, send an email > to:[EMAIL PROTECTED] > (Put the word unsubscribe in the subject field) > _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) No virus found in this incoming message. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.20.4/1275 - Release Date: 12/02/2008 15:20 No virus found in this outgoing message. Checked by AVG Free Edition. Version: 7.5.516 / Virus Database: 269.20.4/1275 - Release Date: 12/02/2008 15:20 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
