This is a reply to all that responded. Thank you for your help and your guidance. It is greatly appreciated. I was not fully aware of the info contained in NFPA 291 and reading that section has shed a lot of light in the results we have.
As a clarification, the numbers posted was just one of 6 tests taken around the building using multiple hydrants. The tests were performed by an separate entity and it seems their testing procedures leave something to be desired. From what we can determine, they did not do any adjustments to the pumper connection as outlined by 291. They did not indicate what type of outlet was present on the 2 1/2" hydrant (to determine the coefficient they used). Unfortunately, we can only use what they gave us. And some of the numbers are strange indicating something is happening behind the scenes that we are not aware of. It's not helping there is an uncooperative utility there too. At least now we have a better understanding of the data. Again, thank you for all your help. Richard On Wed, Jun 24, 2009 at 9:00 AM, Chris Cahill <[email protected]>wrote: > According to NFPA 291 2 1/2" openings 15-25 pitot. 4 or larger 5-10 pitot. > > > Chris Cahill, P.E. > Fire Protection Engineer > Sentry Fire Protection, Inc. > > 763-658-4483 > 763-658-4921 fax > > Email: [email protected] > > Mail: P.O. Box 69 > Waverly, MN 55390 > > Location: 4439 Hwy 12 SW > Waverly, MN 55390 > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Paul > Pinigis > Sent: Tuesday, June 23, 2009 2:33 PM > To: [email protected] > Subject: RE: Hydrant Flow test results > > Any single-hydrant test is questionable to begin with, but if two tests > are done they should yield identical graphs. Pitot pressures of less > than 10 psi are generally unacceptable. > > Paul Pinigis, P.E. > Life Safety Department Head > > > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Richard > Lindner > Sent: Tuesday, June 23, 2009 3:25 PM > To: sprinklerforum > Subject: Hydrant Flow test results > > Have a question regarding hydrant flow tests. > > We have received a report where the contractor flow a single 2 1/2" > outlet > and gave us static, residual, pitot and calculated flow. He then > performed > another test using the 4 1/2" outlet on the hydrant, again giving us > values. > > Plotting the graph, is there supposed to be a correlation between the > testing of the 2 1/2" versus the 4 1/2" or are they supposed to be used > separately. For example, when graphing the 2 1/2" outlet, the 4 1/2" > outlet > info should be hitting this line or not?? > > Also, is a pitot reading of a range of 4 to say 8 on a 4 1/2" outlet > valid > data? > > We're not sure how to use this info. > > Richard > _______________________________________________ > Sprinklerforum mailing list > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > For Technical Assistance, send an email to: > [email protected] > > To Unsubscribe, send an email > to:[email protected]<to%[email protected]> > (Put the word unsubscribe in the subject field) > _______________________________________________ > Sprinklerforum mailing list > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email > to:[email protected]<to%[email protected]> > (Put the word unsubscribe in the subject field) > > _______________________________________________ > Sprinklerforum mailing list > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email > to:[email protected]<to%[email protected]> > (Put the word unsubscribe in the subject field) > _______________________________________________ Sprinklerforum mailing list http://lists.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)
