Did you make the pumper modifications that are req'd per NFPA 291. For pitot less than 7 on a pumper outlet, you are supposed to use the same formula for the 2.5" outlet, then multiple the flow by 0.83, if I recall correctly. Just check 291 for the exact values.
In theory, you are drawing a straight line and it should model out close, within error of gauges and humans reading the gauges. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Richard Lindner Sent: Tuesday, June 23, 2009 12:25 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] (Put the word unsubscribe in the subject field) __________ NOD32 4181 (20090623) Information __________ This message was checked by NOD32 antivirus system. http://www.eset.com _______________________________________________ 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)
