Why penalize yourself? On a combined riser, you a separate calc to the TOP of the riser per NFPA 14 and another calculate at the floor with ALL the hose demand OUTSIDE per NFPA 13 (ie 100 gpm for LH) that is unless you have hose connections elsewhere on the floor that is required by 13. The hose connection on the standpipe is not part of the inside hose demand for 13.
Roland On Apr 7, 2010, at 5:04 AM, Tom Duross wrote: > Something I've always wondered.. > On a combination system, we take the hose demand at the fdv on the > riser for > the floor we're calculating but I used to have a couple of > firefighters who > worked part time for me. They always told me they connected a floor > or two > below (or above) to keep a separation before entering the fire > floor. I > often wondered why we didn't calc. it that way. > Tom > > Right- but you'd take the 150 off at the nearest hydrant to pump > suction. > And you could leave the 100 inside off there, too, if there aren't > inside > hose connections. > > > _______________________________________________ > 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)
