You’re dealing with exposure protection between and one bldg. being considered the “Exposed Bldg” and the other the “Exposing Bldg” using a water curtain.
NFPA 13, 2013 7.8. These are sometimes designed as open head deluge systems to create the curtain effect to provide separation. Depending on the length of area you can create zones with separate controls to minimize the total system flow if the water supply is an issue. I have had to provide these in cases where two buildings did not meet the required code separation distances or in your case where the fire separation required by code cannot be accomplished due to one bldg. being an open structure. You would basically provide a line of closely spaced sprinklers along the garage for the distances mentioned in the IBC. In 2012 Ed. 3104.5, Exception 1.1 talks about wetting of glazing of which you have none. So 8 ft spacing along the length. You can only cover two stories with one array of sprinklers. Looks like someone will have some reading to do. Craig L. Prahl Fire Protection Group Lead/SME CH2M 200 Verdae Blvd. Greenville, SC 29607 Direct - 864.920.7540 Fax - 864.920.7129 CH2MHILL Extension 77540 [email protected] On Nov 4, 2016, at 12:44 PM, David Williams <[email protected]<mailto:[email protected]>> wrote: We have an newly constructed open parking garage with a surrounding skywalk. The building official is now asking for fire barriers complying with Chapter 31 between the two and the owner and architect want to deal with this using the exception that uses fire protection sprinklers for equivalency. It appears to me that the Code is asking us to protect the parking garage from the skywalk as the Code says to install fire protection sprinklers on the “interior” of the wall (which is the garage side) that fully wet the wall as a compliance path. We already have a fully sprinklered structure, with a row of dry sprinklers eight feet and eight feet on center away on the garage side, but the published spray pattern for the Reliable F1FR56 upright installed by the contractor would leave the top 3 feet of the wall unwetted. It appears to me I would have to install an additional row of heads right along the wall, but even then, it looks like the spray pattern shows drop off at any sort of reasonable spacing so some parts of the wall remain unwetted. What have others done in this situation? [cid:[email protected]]<http://www.lhbcorp.com/who-we-are/our-history/> David Toshio Williams, PE, FPE – Senior MEP/FP Engineer 21 West Superior Street, Suite 500, Duluth, MN 55802 Direct 218.279.2436 | Cell 218.310.2446 LHBcorp.com<http://www.lhbcorp.com/> LHB, Inc. | PERFORMANCE DRIVEN DESIGN. _______________________________________________ Sprinklerforum mailing list [email protected]<mailto:[email protected]> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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