Bobby, Here are a couple things to consider in this situation.
1. Have any modifications been made to the system over the years that were done without following the pipe schedule method? This usually is what will trigger a hydraulic review and is unfortunately pretty common in older buildings that have had their usage changed over the years. In this situation you could do a simple walkthrough of the majority of the building to confirm the original pipe schedule, and then prepare smaller drawings of just the remote areas of any modified areas. In this circumstance I would probably want to install both new hydraulic placards as well as a sign stating that the system is pipe scheduled. 2. Has a backflow been retroactively installed on the riser? In this case you may need to prove that the pipe schedule still works with the added pressure loss of the backflow preventer. This wouldn't necessarily require plans and calcs of the entire building, but would require a new flow test to be the base-line of the pipe schedule flow/pressure assessment. 3. If you have found the unicorn building that has had no modifications, and doesn't have a backflow installed, then congratulations! In this case you do not need a hydraulic placard and just need to install a sign the states that the system was installed via the pipe schedule method. Hope this helps! Eric Rieve Rieve Fire Protection From: Bobby Welch <bobby.we...@koorsen.com> Sent: Wednesday, July 12, 2023 2:30 PM To: Discussion list on issues relating to automatic fire sprinklers <sprinklerforum@lists.firesprinkler.org> Subject: [Sprinklerforum] Old Pipe Scheduled Systems I am running into a lot of old systems that do not have hydraulic placard and some of them are old pipe scheduled system. Has anyone ran into an old pipe schedule system were the fire marshal is requesting hydraulic placards and if so has anyone found a way to satisfy the requirements without surveying the entire system and running new calculations? Bobby Welch | Sprinkler Systems Designer KOORSEN FIRE & SECURITY 8090 N Dixie Dr, Dayton, OH 45414 P 937.641.8403 | Ext. 0318 | M 937.594.8457 bobby.we...@koorsen.com<mailto:bobby.we...@koorsen.com> | www.koorsen.com<http://www.koorsen.com> 24x7x365 Service: 937.660.7050 | servic...@koorsen.com<mailto:servic...@koorsen.com>
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