Prior to 2022, it could not. The 2022 edition includes new language waving the minimum area and spacing requirements, specifically:
14.2.4.3 In buildings with obstructed construction where ESFR sprinklers are installed in accordance with 14.2.4.1 and the sprinklers are located entirely above the bottom plane of the adjacent solid structural members (beams, stem, and so forth), the requirements for minimum sprinkler spacing per 14.2.9.4 shall apply within each channel formed by the solid structural members, but the requirements for minimum sprinkler area spacing per 14.2.8.3 and minimum sprinkler linear spacing per 14.2.9.4 for sprinklers between channels formed by the solid structural members shall not apply. Similar exemptions were added for solid structural members in otherwise unobstructed construction. I don't see nor am I aware of any requirement to change the calculation number of sprinklers or discharge based on using these exemptions. Mike Morey CFPS 3229 • NICET S.E.T. 123677 Project Manager • Fire Protection Group Shambaugh & Son, LP an EMCOR Company 7614 Opportunity Drive • Fort Wayne, IN • 46825 direct 260.487.7824 / cell 260.417.0625 / fax 260.487.7991 email [email protected] -----Original Message----- From: Sprinklerforum <[email protected]> On Behalf Of Kyle.Montgomery via Sprinklerforum Sent: Wednesday, December 29, 2021 2:41 PM To: [email protected] Cc: Kyle.Montgomery <[email protected]>; Mike Hairfield <[email protected]> Subject: RE: ESFR - Minimum Remote Area Size BE ADVISED - This email originated outside EMCOR. Deflector distance isn't a problem, I can either run the branch line up high in every pocket/bay or utilize an upright ESFR (Tyco ESFR-17). I was thinking that the minimum spacing didn't apply when there was an obstruction/baffle between the heads (in this case, the legs of the concrete tee) and the heads are installed in "every bay channel formed by solid structural members". This is specifically allowed in the FM Datasheets, but I believe they also have a minimum remote areas size that would require you to add sprinklers to the remote area. Is the consensus among the group that this building (concrete tees with legs 5 feet on center) just cannot be protected with ESFR sprinklers per NFPA 13? And, if that's the case, are we also saying that any time there is a beam/obstruction in an ESFR system that the heads on either side of it still need to be at least 8 feet apart? You can't have a head 3 feet away on each side of the beam (heads 6 feet apart but with a solid obstruction/baffle between them)? -Kyle M -----Original Message----- From: Sprinklerforum <[email protected]> On Behalf Of Mike Hairfield via Sprinklerforum Sent: Wednesday, December 29, 2021 12:22 PM To: [email protected] Cc: Mike Hairfield <[email protected]> Subject: [EXTERNAL] Re: ESFR - Minimum Remote Area Size I don’t believe ESFR sprinklers can be installed in a concrete tee building. Minimum spacing is 8’-0” and what is the deflector distance. Mike Sent from my iPhone > On Dec 29, 2021, at 2:11 PM, Kyle.Montgomery via Sprinklerforum > <[email protected]> wrote: > > I'm dealing with an existing concrete tee building that the owner wants to > retrofit with an ESFR system. Heads will be closely spaced due to the > obstruction caused by the tees; 5-foot on center. 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