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 -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Matt Grise Sent: Thursday, October 29, 2015 3:58 PM To: [email protected] Subject: RE: ESFR Sprinklers and covered catwalks It is my understanding that the ESFR's under the catwalk are needed to address commodity fires at the lower rack levels. Part of the effectiveness of the roof level ESFR's is their ability to spray the face of the products on the racks including those below the level of the catwalk. If SSU's are put down there it could greatly reduce the amount of water that reaches the lower storage levels. I'm trying to find the source for that... Matt Grisé PE*, LEED AP, NICET II Sales Engineer Alliance Fire Protection 130 w 9th Ave. North Kansas City, MO 64116 *Licensed in KS & MO 913.888.0647 ph 913.888.0618 f 913.526.7443 cell www. AFPsprink.com -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of John F Hoffman Sent: Thursday, October 29, 2015 3:39 PM To: [email protected] Subject: RE: ESFR Sprinklers and covered catwalks We ran across this recently in an ESFR warehouse that has shelf storage with a grated walkway at about the 8 foot elevation. Turns out they don't make an intermediate level ESFR or guards for them to meet 8.12.5.3.3. So you are forced to put a solid walkway but the ESFR sprinklers with large pipe still extend down to where they can be damaged easily. Seems logical to protect the area below the grating/covered walkway with quick response sprinklers for the hazard involved (non-ESFR) that can be equipped with guards and be SSUs. 8.12.5.3.4 allows spray sprinklers for overhead doors. 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 -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Matthew J Willis Sent: Thursday, October 29, 2015 10:39 AM To: [email protected] Subject: RE: ESFR Sprinklers and covered catwalks I understand, but 8.12 is ESFR chapter. R/ Matt -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Steve Mackinnon Sent: Thursday, October 29, 2015 9:37 AM To: [email protected] Subject: RE: ESFR Sprinklers and covered catwalks Matt, we are not trying to omit sprinklers, just determine which sprinkler to use ESFR vs control mode... Steven MacKinnon Fire Protection Division Hartcorn Plumbing and Heating, Inc. 850 South Second Street Ronkonkoma, NY 11779 Office 631-580-2300 Fax - 631-580-1090 -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Matthew J Willis Sent: Thursday, October 29, 2015 11:35 AM To: [email protected] Subject: RE: ESFR Sprinklers and covered catwalks 2007.. 8.12.5.3 Continuous Obstructions Below the Sprinklers. 8.12.5.3.1 General Continuous Obstructions. Sprinklers shall be arranged with respect to obstructions in accordance with one of the following: (1) Sprinklers shall be installed below continuous obstructions, or they shall be arranged to comply with Table 8.12.5.1.1 for horizontal obstructions entirely below the elevation of sprinklers that restrict sprinkler discharge pattern for two or more adjacent sprinklers such as ducts, lights, pipes, and conveyors. (2) Additional sprinklers shall not be required where the obstruction is 2 in. (51 mm) or less in width and is located a minimum of 2 ft (0.6 m) below the elevation of the sprinkler deflector or is positioned a minimum of 1 ft (0.3 m)horizontally from the sprinkler. (3) Additional sprinklers shall not be required where the obstruction is 1 ft (0.3 m) or less in width and located a minimum of 1 ft (0.3 m) horizontally from the sprinkler.(4) Additional sprinklers shall not be required where the obstruction is 2 ft (0.6 m) or less in width and located a minimum of 2 ft (0.6 m) horizontally from the sprinkler.(5) Ceiling sprinklers shall not be required to comply with Table 8.12.5.1.1 where a row of sprinklers is installed under the obstruction. Where can you omit? R/ Matt -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Steve Mackinnon Sent: Thursday, October 29, 2015 9:28 AM To: [email protected] Subject: RE: ESFR Sprinklers and covered catwalks The conversation in the office kept going back to hvac ductwork and how you would place an ESFR sprinkler underneath when it became an obstruction... Normally there will be commodity stored under the duct, but in this situation, no stock will be in the catwalks, just the racks... so the additional ESFR sprinklers will spray the catwalks and not necessarily the commodity... is this over kill?? Steven MacKinnon Fire Protection Division Hartcorn Plumbing and Heating, Inc. 850 South Second Street Ronkonkoma, NY 11779 Office 631-580-2300 Fax - 631-580-1090 -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of [email protected] Sent: Thursday, October 29, 2015 11:13 AM To: [email protected] Subject: RE: ESFR Sprinklers and covered catwalks The catwalk is no different than any other obstruction within the area, right? For any other obstruction you would use the same ESFR's below the obstruction as you used at the ceiling/roof. Craig L. Prahl Fire Protection Group Lead/SME CH2MHILL Lockwood Greene 1500 International Drive Spartanburg, SC 29303 Direct - 864.599.4102 Fax - 864.599.8439 CH2MHILL Extension 74102 [email protected] -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Steve Mackinnon Sent: Wednesday, October 28, 2015 3:45 PM To: [email protected] Subject: ESFR Sprinklers and covered catwalks Hello everybody, I have a situation where a client is looking to install an ESFR system protecting racks... they would like to add a solid floor catwalk system between the racks. Do you continue installing ESFR sprinklers under each level or can you install control mode sprinkler under the catwalks while the ESFR's at the ceiling protect the commodity?? I did look up the archives and a few people have asked similar questions over the years, but I don't see an answer... NFPA 13, 2007 ed. Thank you in advance! 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