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> > -- Ron Greenman Instructor Fire Protection Engineering Technology Bates Technical College 1101 So. Yakima Ave. Tacoma, WA 98405 [email protected] http://www.bates.ctc.edu/fireprotection/ 253.680.7346 253.576.9700 (cell) Member: ASEE, SFPE, ASCET, NFPA, AFSA, NFSA, AFAA, NIBS, WSAFM, WFC They are happy men whose natures sort with their vocations. -Francis Bacon, essayist, philosopher, and statesman (1561-1626) -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20111004/280368a3/attachment.html> _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
