Nope. Cory's right. Go further into the section, 7.2.3.6 (I put the book away and so I don't have the last number) and you'll see that you're referred back to the same table when using a manual method. There is a disclaimer about not having to hitting the calc time dead on but within the allowable range. I was in the handbook so some of my comments might have come from the commentary. So the question of can you use multiple orifices has been answered. You're apparently required to do so depending on hazard type if you're using 2010. Now is an 1 x 11.2K equivalent to 2 x 5.6K? That was the still unanswered original question.
On Tue, Oct 4, 2011 at 3:27 PM, Rod DiBona <[email protected]> wrote: > Cory, > > That is only for calculations using a fluid delivery time calculation > software. As Ron said when doing an IT it is always the smallest orifice > used to ensure a trip. These are two totally different issues. FYI. > > Rod DiBona > Rapid Fire > > -----Original Message----- > From: [email protected] [mailto: > [email protected]] On Behalf Of Cory Power > Sent: Tuesday, October 04, 2011 4:13 PM > To: [email protected] > Subject: Re: Equiv Orifice for OH Inspectors Test > > NFPA 13 Table 7.2.3.6.1 Dry Pipe System Water Delivery > > States Ordinary Hazard group 1 to have 2 most remote sprinklers initially > open with 50 second water delivery time > > -- > Cory Power > P& P Sprinklers Ltd > 6 Main Rd > Chapel Arm, NL A0B 1L0 > Ph: (709) 592-2029 > Fax: (709) 592-2019 > > > On 10/4/2011 7:38 PM, Ron Greenman wrote: > > I'm afraid you always use the single smallest orifice in the system as > you > > IT test orifice and one only, no matter the hazard. The objective is to > > insure that trip time or alarm initiation occurs within the allotted > time > > if only one head of the smallest orifice type in the system is flowing. > > > > On Tue, Oct 4, 2011 at 2:57 PM, Cory Power<[email protected]> > wrote: > > > >> Doesn't Ordinary Hazard require two flowing heads? > >> > >> > >> -- > >> Cory Power > >> P& P Sprinklers Ltd > >> 6 Main Rd > >> Chapel Arm, NL A0B 1L0 > >> Ph: (709) 592-2029 > >> Fax: (709) 592-2019 > >> > >> > >> On 10/4/2011 7:24 PM, Ron Greenman wrote: > >> > >>> This may be a dumb question but if it's a system with 5.6K heads as the > >>> smallest orifice then it needs to alarm (AV) with one head flowing or > trip > >>> (DPV) with one head flowing. Why would you have two heads for the IT? > >>> > >>> On Tue, Oct 4, 2011 at 2:48 PM, Cory Power<[email protected]> > wrote: > >>> > >>> The reason I'm asking is because it is an ordinary hazard system and > in > >>>> the plans they spec the inspectors test routing to a hub drain in a > >>>> janitors > >>>> closet. It would be much easier to have one 11.2k orifice above the > hub > >>>> drain than two 5.6 k's. > >>>> > >>>> > >>>> -- > >>>> Cory Power > >>>> P& P Sprinklers Ltd > >>>> 6 Main Rd > >>>> Chapel Arm, NL A0B 1L0 > >>>> Ph: (709) 592-2029 > >>>> Fax: (709) 592-2019 > >>>> > >>>> > >>>> On 10/4/2011 6:07 PM, Justin Reid wrote: > >>>> > >>>> The Q=k*sqrt(p) math says that it should be equal flow with equal > >>>>> pressure. > >>>>> I guess you would have slightly less pressure with the 11.2 since > there > >>>>> is > >>>>> more flow(friction). > >>>>> > >>>>> I just had an issue yesterday trying to get a flow valve to trip with > a > >>>>> remote test (one head) and thought the same thing (to look at using > two > >>>>> heads). > >>>>> > >>>>> Good luck, > >>>>> > >>>>> Justin Reid > >>>>> > >>>>> > >>>>> > >>>>> > >>>>> On Tue, Oct 4, 2011 at 1:13 PM, Cory Power<[email protected]> > >>>>> wrote: > >>>>> > >>>>> Just wondering if anyone have used an 11.2 K Orifice to substitute > for > >>>>> > >>>>>> two > >>>>>> 5.6 k heads on an OH1 Dry Inspectors test? Shouldn't it be > equivalent? > >>>>>> > >>>>>> -- > >>>>>> Cory Power > >>>>>> P& P Sprinklers Ltd > >>>>>> 6 Main Rd > >>>>>> Chapel Arm, NL A0B 1L0 > >>>>>> Ph: (709) 592-2029 > >>>>>> Fax: (709) 592-2019 > >>>>>> > >>>>>> -------------- next part -------------- > >>>>>> An HTML attachment was scrubbed... > >>>>>> URL:<http://fireball.****firespr**inkler.org/mailman/****< > >>>>>> http://firesprinkler.org/**mailman/**< > http://firesprinkler.org/mailman/**> > >>>>>> private/sprinklerforum/******attachments/20111004/c48f4ae4/**** > >>>>>> **attachment.html<http://**fir**eball.firesprinkler.org/**** > >>>>>> mailman/private/< > http://fireball.firesprinkler.org/**mailman/private/> > >>>>>> **sprinklerforum/attachments/****20111004/c48f4ae4/attachment.** > >>>>>> **html<http://fireball.**firesprinkler.org/mailman/** > >>>>>> private/sprinklerforum/**attachments/20111004/c48f4ae4/** > >>>>>> attachment.html< > http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20111004/c48f4ae4/attachment.html > > > >>>>>> ______________________________******_________________ > >>>>>> Sprinklerforum mailing list > >>>>>> Sprinklerforum@firesprinkler.******org<Sprinklerforum@** > >>>>>> firesprinkler.** > >>>>>> org<Sprinklerforum@**firesprinkler.org< > [email protected]> > >>>>>> http://fireball.firesprinkler.******org/mailman/listinfo/**** > >>>>>> sprinklerforum<http://**fireba**ll.firesprinkler.org/**** > >>>>>> mailman/listinfo/**< > http://fireball.firesprinkler.org/**mailman/listinfo/**> > >>>>>> > >>>>>> sprinklerforum<http://** > fireball.firesprinkler.org/**mailman/listinfo/ > >>>>>> **sprinklerforum< > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum> > >>>>>> -------------- next part -------------- > >>>>>> > >>>>> An HTML attachment was scrubbed... > >>>>> URL:<http://fireball.**firespr**inkler.org/mailman/**< > http://firesprinkler.org/mailman/**> > >>>>> private/sprinklerforum/****attachments/20111004/53f36606/** > >>>>> **attachment.html<http://**fireball.firesprinkler.org/** > >>>>> mailman/private/**sprinklerforum/attachments/** > >>>>> 20111004/53f36606/attachment.**html< > http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20111004/53f36606/attachment.html > > > >>>>> ______________________________****_________________ > >>>>> Sprinklerforum mailing list > >>>>> Sprinklerforum@firesprinkler.****org<Sprinklerforum@** > firesprinkler.org<[email protected]> > >>>>> http://fireball.firesprinkler.****org/mailman/listinfo/**** > >>>>> sprinklerforum<http://** > fireball.firesprinkler.org/**mailman/listinfo/* > >>>>> *sprinklerforum< > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum> > >>>>> -------------- next part -------------- > >>>> An HTML attachment was scrubbed... > >>>> URL:<http://fireball.**firespr**inkler.org/mailman/**< > http://firesprinkler.org/mailman/**> > >>>> private/sprinklerforum/****attachments/20111004/655dd34b/** > >>>> **attachment.html<http://** > fireball.firesprinkler.org/**mailman/private/ > >>>> **sprinklerforum/attachments/**20111004/655dd34b/attachment.**html< > http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20111004/655dd34b/attachment.html > > > >>>> ______________________________****_________________ > >>>> Sprinklerforum mailing list > >>>> Sprinklerforum@firesprinkler.****org<Sprinklerforum@** > firesprinkler.org<[email protected]> > >>>> http://fireball.firesprinkler.****org/mailman/listinfo/**** > >>>> sprinklerforum<http://** > fireball.firesprinkler.org/**mailman/listinfo/** > >>>> sprinklerforum< > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum> > >>>> > >>> -------------- next part -------------- > >> An HTML attachment was scrubbed... > >> URL:<http://fireball.**firesprinkler.org/mailman/** > >> > private/sprinklerforum/**attachments/20111004/58b8f241/**attachment.html< > http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20111004/58b8f241/attachment.html > > > >> ______________________________**_________________ > >> Sprinklerforum mailing list > >> Sprinklerforum@firesprinkler.**org<[email protected]> > >> http://fireball.firesprinkler.**org/mailman/listinfo/**sprinklerforum< > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum> > >> > > > > > -------------- next part -------------- > An HTML attachment was scrubbed... > URL: < > http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20111004/6c14f08e/attachment.html > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > -- Ron Greenman Instructor Fire Protection Engineering Technology Bates Technical College 1101 So. 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