Craig I wil check this one. Thaanx a lott
Sam On Mon, Jul 27, 2009 at 4:27 PM, <[email protected]> wrote: > Sam to answer your questions: > > 1. I would look at NFPA 13 and see what is the required ceiling density > based on the rack storage scenario. As I said, the existing ceiling system > may or may not be compliant. Start looking at this building as if it were > a brand new project, define all your criteria and see what you get. Then > look at it based on the existing ceiling system criteria and see if there > are any options that match that criteria. > > 2. The area below the grating needs sprinklers. There's no way to avoid > that. > > 3. That's a tough question without knowing what exactly you have as far as > components. Are these finished circuit boards or are these miscellaneous > small parts? If it's small parts then what are they made of? My first > impression would be probably class II or III but electronics can vary. > > > > > Craig L. Prahl, CET > Fire Protection Specialist > Mechanical Department > CH2MHILL > Lockwood Greene > 1500 International Drive > PO Box 491, Spartanburg, SC 29304-0491 > Direct - 864.599.4102 > Fax - 864.599.8439 > [email protected] > http://www.ch2m.com > > > -----Original Message----- > From: [email protected] [mailto: > [email protected]] On Behalf Of sam b > Sent: Friday, July 24, 2009 4:06 PM > To: [email protected] > Subject: Re: In rack sprinklers at celing level > > Craig > > As you said, I have lost my way, > actually the AHJ comments were little confusing for me.. > First of all they asked to > provide sprinklers(in rack type) at the ceiling level of the mezzanine for > the below racks. and next for some query they commented back saying inrack > sprinklers cant b avoided. > I think I misread that for inrack sprinklers only.(even though he mentioned > clearly - positioned at ceiling). > Since there was no racks at the beginning they have designed the already > existing ceiling sprinklers @ 0.2 gpm/ft2 only. > > I have 3 issues now. > > 1. In case if we are providing ceiling sprinklers below mezz level and > also rack sprinklers ,Does that mean that no change in the already existing > ceiling sprinklers be required? > > 2.."""One you need to provide sprinklers below the mezzanine since the > floor space is now shielded from the ceiling sprinklers."""" IS this > applicable if the mezz is of grating type steel constrctn(means floor space > is not fully sheilded from ceiling sprinklers)? > In other wrds, can we avoid ceiling sprinkelrs below mezz level and go with > only inrack sprinklers? > > 3.which commodity class can electronic goods(for scada panels)packed in > cartons be considered? > > > Sam > > > > > On Thu, Jul 23, 2009 at 5:03 PM, <[email protected]> wrote: > > > >From what you've written it sounds as if you are going a different > > direction than what the AHJ is requesting. From your e-mail it > > appears that he is only requesting sprinklers below the mezzanine, not > in-racks. > > > > Now what he is asking for to be installed below the mezzanine is the > > "Intermediate Style" sprinkler such as the Reliable "F-1" or Viking > > VK550/560 or similar with the integral steel shield. > > > > Some of the things you are going to need before going much further are > > the temperature of the existing ceiling sprinklers and the design > > criteria of the existing ceiling sprinklers. > > > > Looking at Table 16.2.1.3.2 and Figure 16.2.1.3.2(b), even with > > in-racks the ceiling system criteria would need to supply somewhere > > between .24 and .26/2000. I'd be suspicious of a 5.6K design system > > being designed to that criteria. Applying Fig. 16.2.1.3.4.1, per > > Table 16.2.1.3.2 at 60% of that (somewhere around .15) the ceiling system > may work. > > > > So what I'm saying is you need more info. > > > > You have two issues. One you need to provide sprinklers below the > > mezzanine since the floor space is now shielded from the ceiling > sprinklers. > > That's a given. Second you need to examine the need for in-rack > > sprinklers. Depending on the performance of the ceiling system, how > > you classify the commodity and what your design criteria will be > > below the mezzanine, you may or may not need in-racks. > > > > > > > > As you would imagine, I've only spent a few minutes taking a look at > > this so there may be other potential approaches that would work. But > > as time is limited I leave that for you to explore. > > > > > > > > Craig L. Prahl, CET > > Fire Protection Specialist > > Mechanical Department > > CH2MHILL > > Lockwood Greene > > 1500 International Drive > > PO Box 491, Spartanburg, SC 29304-0491 Direct - 864.599.4102 Fax - > > 864.599.8439 [email protected] http://www.ch2m.com > > > > > > -----Original Message----- > > From: [email protected] [mailto: > > [email protected]] On Behalf Of sam b > > Sent: Thursday, July 23, 2009 7:38 AM > > To: [email protected] > > Subject: In rack sprinklers at celing level > > > > Hiii > > > > > > I visited a warehouse (8.6 m height) which is protected by upright > > sprinklers (K-5.6) . > > > > Now the client have added a steel mezzanine structure with racks > > above and below. > > > > Now local Fire authority have asked to *provide sprinklers(in rack > > type) at the ceiling level of the mezzanine for the below racks.* > > > > ** > > > > Racks below will be stored with electronic good items in cartons > > (mainly items for electronic panels). > > > > Max storage height will be 4 m. > > > > Their are 5 multiple row racks (2.4m wide and 9.3 m length) and 2 > > single row racks of 1.2 m wide and 9.3 m length). aisle width of 1.2 m > > between racks. > > > > > > > > >From NFPA ,I could see only one layer rack sprinklers enough for each > > >rack > > and since only 9.3 m length I need only 3 in rack sprinklers per rack. > > > > when the sprinklers provided at ceiling Is this the correct way forward?? > > > > Can we provide In rack sprinklers at ceiling in these cases? > > > > > > > > I am not finding it easy to locate the answer. > > > > > > > > Any help welcome > > > > > > Thaanx in advance > > > > Sam > > _______________________________________________ > > 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]<to%[email protected]> > <to%3ASprinklerforum-reques > > [email protected]> (Put the word unsubscribe in the subject field) > > _______________________________________________ > > 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]<to%[email protected]> > <to%3ASprinklerforum-reques > > [email protected]> (Put the word unsubscribe in the subject field) > > > _______________________________________________ > 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]<to%[email protected]> > (Put the word unsubscribe in the subject field) > _______________________________________________ > 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]<to%[email protected]> > (Put the word unsubscribe in the subject field) > _______________________________________________ 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)
