Hmmm...John that is interesting direction you are giving there. Do you have NFPA 13 or full-scale testing to support the "ESFR could spray below the catwalk" comment? Or, that OH2 below the catwalk will not allow the fire to grow horizontally along the racking overwhelming the ESFR above?
If the catwalk doesn't extend through the rack how can you protect a 30' high (or pick a height) rack storage with QR sprinklers below the catwalk level and ESFR above the catwalk level when it's all the same rack storage from the ground up with flue spaces open and continuous to the roof. I must be missing something here. I assume the direction of the catwalk would/could enter into the scenario, but I would like to see your support for the comments you've made here, and if you have that support great! Scott Office: (763) 425-1001 x 2 Cell: (612) 759-5556 -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of John F Hoffman Sent: Thursday, October 29, 2015 4:14 PM To: [email protected] Subject: RE: ESFR Sprinklers and covered catwalks If the roof-level ESFR could spray below the catwalk (assuming open grating) you would not need the sprinklers under the catwalk. But, as mentioned before, you are forced to put a cover on the grating so should be able to install whatever sprinklers can deal with the hazard under the grating. Class IV shelf storage up to 12 feet high can be protected with OH2. Even plastic shelf storage only requires EH1 or EH2 depending on height. ESFR is overkill. John F. Hoffman, PE* \ Burns & McDonnell Senior Fire Protection Engineer O 816-349-6759 \ M 816-255-4102 [email protected] \ burnsmcd.com 9400 Ward Parkway \ Kansas City, MO 64114 Proud to be one of FORTUNE's 100 Best Companies to Work For Please consider the environment before printing this email. *Registered in: MO _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
