Here is part of an email from FM concerning a processing plant we did in 2010. I hope it helps.
"The major change in this submittal involved replacing suppression mode sprinklers over the process mezzanine with control mode sprinklers. The spacing of the sprinklers appears to be the same as the previous design. The sprinkler systems in the process area are now designed as follows (most demanding design listed): Process and Bale Storage Area: Two sprinkler designs are used in this area. Early suppression fast response (ESFR), or suppression mode sprinklers protect the majority of the space. Control mode density area (CMDA), non-storage sprinklers are used to protect the process area mezzanine. ESFR Design: 12 heads + 2 @ 63 psi each, requiring 2,194 gpm @ 141.8 psi at the pump discharge. Sprinklers are Tyco SIN # TY7226, ESFR, K = 16.8. 214°F, FM Approved heads. The maximum head spacing is 10 ft. by 10 ft. The calculations allow for a 250 gpm hose stream allowance. CMDA Design: 0.50 gpm/sq.ft. / 3,000 sq.ft. requiring 2,239 gpm @ 81.5 psi at the pump discharge. Sprinklers are Tyco SIN # TY5151, SR, K = 11.2. 200°F, pendent, FM Approved heads. The maximum area per head is 93 sq.ft. The calculations allow for a 500 gpm hose stream allowance. Credit is being given (contingent to compliance with the requirements listed below) to the structural beam that runs along column line G as a ceiling barrier for the purpose of separating the control mode and suppression mode sprinklers. This beam reportedly meets the following requirements: 1) The beam is noncombustible, solid, and extends at least 2 ft. below the roof deck. 2) The beam fits tightly against the underside of the roof. Openings created by ribs in the metal roof deck are not a concern, but openings created by channels between purlins or other structural members should be sealed. 4 ft. of clear space should be maintained, centered below the beam. There is no ceiling barrier separating the control mode from the ESFR sprinklers on the east side of the mezzanine. Since no ceiling barrier is present, the ESFR sprinklers were extended approximately 22 ft. west of gridline 13 into the process mezzanine area. A full height demising wall is located along gridline 7 and will serve to separate the control mode sprinkles protection from the occupancy on the west side of the wall. The north wall of structure is located along column line B." Ron F -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Roland Huggins Sent: Tuesday, March 12, 2013 7:21 AM To: [email protected] Subject: Re: single stream recycling but also lend itself to a smoldering / burrowing fire might make it worth a bump-up in the density Roland On Mar 12, 2013, at 5:09 AM, Matt Grise <[email protected]> wrote: > we figured it would be similar to a closed array pile. Since it is all loose > trash, it is hard for air to get to the interior. > > Matt Grisé PE*, LEED AP, NICET II > Sales Engineer > Alliance Fire Protection -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20130312/39fd98db/attachment.html> _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
