Actually it's both, but you'll not find to my knowledge any K5.6 or smaller heads with a droplet size big enough to penetrate a large fire in a building this high. I seem to recall that the droplets from SSU's are large than from SSP's, but I don't remember where I heard that. Some EC heads may provide a larger droplet size, but I really don't know. That's why I said get the PE to tell you what will work, then it's on his insurance, at least as much as yours.
Roland? What was that arena you did a model of with 1/2" orifice heads? 120' AFF? As an assembly occupancy, only requiring a 0.10 density, it's probable the designer wouldn't look at anything larger than 5.6K unless he looked a EC, and if the water pressure was really good, possibly even smaller than 5.6K. Thom McMahon, SET Firetech, Inc. 2560 Copper Ridge Dr P.O. Box 882136 Steamboat Springs, CO 80488 Tel: 970-879-7952 Fax: 970-879-7926 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Autry, David Sent: Wednesday, September 10, 2008 10:43 AM To: [email protected] Subject: RE: Help!! Sprinkler in Planetarium Doesn't the deflector determine the droplet size more than the k-factor? David Autry Plans Examiner Nebraska State Fire Marshal's Office 246 S. 14th Street Lincoln, NE 68508 402-471-9659 402-471-3118 fax www.sfm.ne.gov ** Note new email address: [EMAIL PROTECTED] -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Thom McMahon Sent: Wednesday, September 10, 2008 11:16 AM To: [email protected] Subject: RE: Help!! Sprinkler in Planetarium I believe that the reason that you would need the K factor is that modeling has shown that in very high ceilings like arena's and such the droplet size is very important if you want the water to reach the floor in a fire, and not just be steam 30' AFF. I agree it should be the PE, not the AHJ deciding this, without further guidance in the standards. The important thing for the AHJ is to recognize the potential for failure if you simply "Provide coverage per the code". Thom McMahon, SET Firetech, Inc. 2560 Copper Ridge Dr P.O. Box 882136 Steamboat Springs, CO 80488 Tel: 970-879-7952 Fax: 970-879-7926 -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Autry, David Sent: Wednesday, September 10, 2008 7:23 AM To: [email protected] Subject: RE: Help!! Sprinkler in Planetarium "Start with checking with the AHJ & see what k-factor they require" Why in the hell would an AHJ be giving a k-factor????? Does this even make sense? I would tell you to provide coverage per the code, and if it is not in black and white in the code, then have an engineer tell me what/how you are going to protect it. David Autry Plans Examiner Nebraska State Fire Marshal's Office 246 S. 14th Street Lincoln, NE 68508 402-471-9659 402-471-3118 fax www.sfm.ne.gov ** Note new email address: [EMAIL PROTECTED] -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ron Sent: Wednesday, September 10, 2008 7:20 AM To: [email protected] Subject: Re: Help!! Sprinkler in Planetrium George, I did an omni max dome a few years back so I know what you are up against. Start with checking with the AHJ & see what k-factor they require for a 60' high ceiling, thats the first problem. One way or another you have to cover all the floor area, if that can be done with heads only above the screen then you're in business. Ron Dusky ----- Original Message ----- From: "George Lau" <[EMAIL PROTECTED]> To: <[email protected]> Sent: Tuesday, September 09, 2008 7:24 PM Subject: Help!! Sprinkler in Planetrium > Dear Sprinkler Experts, > > I am new to the forum. Besides a "Hi" to yall, I am desperately > seeking suggestion or reference regarding the "Sprinkler installation > in a PLANETARIUM" which possesses a (60ft dia) semi-spherical dome > screen (made of white paint coated matellic plate with small holes). > Our current plan is to keep all those sprinker heads above the dome > screen. Is it a workable design? > > Since we are lack of local technical reference, can anyone throw me > some light regarding the normal practice, if the sprinkler heads > should be above the dome screen. If yes, what other concerns/attention > should be paid? > > Thank you so much, > George Lau > Macau S.A.R. > > > > > _______________________________________________ > 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) > > __________ Information from ESET Smart Security, version of virus > signature database 3431 (20080910) __________ > > The message was checked by ESET Smart Security. > > http://www.eset.com > > _______________________________________________ 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) _______________________________________________ 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) _______________________________________________ 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) _______________________________________________ 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) _______________________________________________ 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)
