I would say that drain piping downstream of the valve is not required to be braced. One of the things I like to impress upon people when teaching seismic is that you brace and secure the pipe to keep the water in the piping. It is also to insure that piping required for the operation of the system shall retain water to keep it functional. Since a gang drain is downstream of the drain valve and has no bearing on the functionality of the system in the event sprinklers or standpipe were ever activated, then I would say it is not required.
Travis Mack, SET M.E.P.CAD | Instructor / Support 181 N. Arroyo Grande Blvd. #105 I Henderson, NV 89074 www.mepcad.com<http://www.mepcad.com/> | m: 480.547.9348| Whatspp: +14805479348 Email: [email protected] AutoSPRINK | AutoSPRINK FAB | AutoSPRINK RVT | AlarmCAD From: Steve Leyton <[email protected]> Sent: Thursday, March 14, 2024 12:35 PM To: [email protected] Subject: [Sprinklerforum] Gang drain crossing seismic joint All (especially Californicators): We have to cross a seismic joint with the piping that supplies a combination standpipe in a mid-rise building (no PRV's to test). As a combo, there's a collection pipe for sectional test and drain discharge, and for reasons peculiar to this building, our first choice is to bring the gang drain back to the riser room, as it's the only place with a SS trap in the basement. We're trying to decide whether a seismic joint is required of the drain pipe, which is normally dry and never under system pressure in any case. I reckon I should know this, but I don't think we've had to address this condition in forever, maybe never. [cid:[email protected]] Steve Leyton, President T | 619.255.8964 x 102 | www.protectiondesign.com<http://www.protectiondesign.com/> 2851 Camino Del Rio South | Suite 210 | San Diego, CA 92108 Fire Protection System Design | Consulting | Planning | Training
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