The answer to your original question is no. NFPA 25 does not require a calculation. It requires the plate.
The information on the plate drives the fact that you must now do a calculation. To be correct, you would have to use the Original flow test, as that was the basis of design. So a new flow test more than likely will not match. Getting a new flow test and calc is NFPA 13. Further NFPA 13 involvement could come into play if the calcs no longer work. At this point, you will have moved well beyond 25, and should be operating under a different scope. If you really wanted to have some fun.., 25 just requires the placard to be in place. What if you see a blank one during the inspection? Per 25, you are compliant. [cid:[email protected]] R/ Matt Matthew J. Willis, CWBSP Design Manager /3-D Specialist Rapid Fire Protection Inc.<http://rapidfireinc.com/> 1530 Samco Road Rapid City, SD 57702 Office-605.348.2342 Direct Line-605.593.5063 Cell-605.391.2733 Fax:-605.348.0108 [cid:[email protected]] From: Sprinklerforum <[email protected]> On Behalf Of Wayne Cordiner Sent: Wednesday, November 21, 2018 7:56 AM To: [email protected] Subject: Re: Calculation Plates John, The key to remember here is in NFPA 25 the intent is to inspect, test and maintain a previously approved system. With that in mind the plate you’d be inspecting exists based on the original installation. The data added even to a new plate should reflect that. Regards, Wayne T. Cordiner, Jr. 917-426-5844 [email protected]<mailto:[email protected]> On Nov 21, 2018, at 05:24, John Irwin <[email protected]<mailto:[email protected]>> wrote: I have been in this industry for 25 years. I believe every company I have ever worked at has done a hydraulic calculation when replacing Hydraulic Placards due to an inspection deficiency. But yesterday we were having a discussion here in the office as to whether or not the calculation was actually required per NFPA 25. There is no information on the plate that indicates whether or not the system even works … just what is required. Does your company do a flow test and calculation when replacing missing plates? And if so, what happens when you discover that the system no longer works as originally designed? John Irwin _______________________________________________ Sprinklerforum mailing list [email protected]<mailto:[email protected]> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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