This should be added to the ug and oh acceptance certificates in 13 Forest Wilson Cherokee Fire
Sent from my Verizon Wireless Phone ----- Reply message ----- From: "Roland Huggins" <[email protected]> Date: Wed, Oct 6, 2010 11:30 am Subject: Backflow Forward Flow Test To: <[email protected]> NFPA 13 says to be flow tested at SYSTEM DEMAND. One might want to use the definition that system demand is Sprinkler flow plus hose demand but the INTENT is to only add hose demand if there are hose connections (or a hydrant) downstream. NFPA 25 is much more precise in their description and says exactly that. There is guidance in the annex regarding what can be used but NFPA 13 is very sloppy regarding this issue. There will be discussion this cycle regarding adding to the list of things required for the submittal verification that the provided means is capable of meeting the system demand. Roland On Oct 4, 2010, at 11:45 AM, Ron Greenman wrote: > As we discussed a few weeks ago the first thing we need to know is > what do we need to test: forward flow only, forward flow at the > hydraulic design, at the design plus hose stream, at the capacity of > the lead-in at the supply pressure, to insure that the checks > completely open...? That will determine what size feed you need to > your test point. Then how do you demonstrate you've met the test > parameters? Barring an answer to the first question you can't answer > the second so this is a mute discussion that is based on reading > chicken bones for a solution. The question isn't how to perform a > forward flow test but rather what question am I trying to answer > when doing so. How will then obvious. > > Ron Greenman > ...On the phone _______________________________________________ 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)
