As much as a rant against double-interlock pre-action valves in computer rooms a freezer IS a place that double-interlock makes sense. You may wish to look into this.
On Mon, Aug 25, 2008 at 2:23 PM, Paul Pinigis <[EMAIL PROTECTED]> wrote: > Yes, you can grid a single-interlock pre-action system. But, in your > case, the specific requirements for Large Drop Sprinklers take precedent > over the general rules. So, you must design the system as though it > were a dry-pipe system (not gridded, C=100, 40% area increase, etc.) > > Paul J. Pinigis, P.E. > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Jimmy > Waite > Sent: Tuesday, August 19, 2008 6:48 PM > To: [email protected] > Subject: * Possible Spam *Pre-Action C Value > > Good afternoon everyone, I am confused by some seemingly conflicting > wording about single-interlock pre-action systems and I need some help. > > > > > Here is the situation. We are protecting a warehouse with Large Drop > Heads. > There is a cooler, and a separate Freezer. They are storing up to 16 > feet, > with a ceiling at 20 feet in these spaces. We are protecting this space > with a Single-Interlock Pre-Action system with Large Drop Heads. Here > is > where I am getting confused. All code references are in the 2002 > edition. > > > > 7.3.2.5 - Double Interlock systems can't be gridded. (So I can grid by > Single-Interlock) > > 12.3.2.2.5- (A) Consider the pre-action systems dry (Table 12.3.2.2.1 > (b) > is the appropriate table) > > (B) When the detection system activating the > preaciton > system will cause water to be at the sprinklers when they operate, > preaction > systems shall be permitted to be treated as wet pipe systems. > > Table 14.4.4.5 - Black Steel (dry systems including preaction) C Value > of > 100; Black Steel (wet system including deluge) C Value of 120. > > > > SO, Is my Single-Interlock Preaction protecting the Cooler and Freezer a > wet > system that I calculate with a C Value of 100? This just seems very odd > to > me and doesn't make much sense. OR, since 12.3.2.2.5 (b) says by system > is > wet, I calculate it with a C Value of 120? Please help me sort this > out. > > > > Also, as a side note, is there any language that will let me eliminate > hose > stations (in the 2002 edition) in a warehouse, storing up to 20 feet, > with a > ceiling of 28 feet, containing a class 4 commodity on open shelf, > multiple-row racks? > > > > Thank you all in advance for your time and comments. > > > > > > > > Jimmy Waite > > Burtell Fire Protection, Inc. > > [EMAIL PROTECTED] > > (406) 652-7697 > > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > To Unsubscribe, send an email > to:[EMAIL PROTECTED] > (Put the word unsubscribe in the subject field) > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > To Unsubscribe, send an email to:[EMAIL PROTECTED] > (Put the word unsubscribe in the subject field) > -- Ron Greenman at home.... _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
