You have an ugly situation with problems on two fronts.
First, you have an excessive building height beyond the capabilities of available sprinklers to handle an ensuing fire. Second, there is excessive clearance from the top of storage to the roof. Excessive lag time to fuse sprinklers would occur due to rising heat from the fire mixing with cooler ambient air, allowing greater fire growth. The sprinklers are then challenged to penetrate the high velocity fire plume from the established fire. Suppression mode and special application sprinklers such as the large drop were designed to penetrate high velocity plumes, but the scenario here exceeds their capabilities. Foam is not very effective for three dimensional fires where storage is to 24 ft. They are best for two dimensional pool fires. The sanest approach from a protection standpoint (not necessarily the best cost) is to install a suspended ceiling to bring the storage clearance and building heights into the scope of a published standard such as NFPA 13 or FM Global Loss Prevention Data Sheet 8-9. Refer to Section 2.3.7.3.1 "Excessive Clearance with CMDA Sprinklers" in 8-9 for advice, which includes the suspended ceiling option. _____ -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Daniel Merkle Sent: Friday, April 10, 2009 9:17 AM To: [email protected] Subject: Re: Storage Sprinkler Sorry, storage height is 24'-0 which would give me 130% per 14.2.4.3. My concern is the 38'-0" of open space to the roof. What if the roof was 100ft. high? Daniel L. Merkle, CET _______________________________________________ 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)
