Since I'm not a contractor I can't speak for our best practices regarding retroactive replacement of missing calc' cards but I can tell you that our firm does at least a half-dozen survey/re-calc exercises a year in order to establish the performance basis of existing systems. Exclusively in HPS occupancies and at the direction of at least three local FDs (all muni) who rank the missing calc' card as a deficiency.
As a design firm, we do a LOT of work on existing systems, especially public buildings and institutional properties. One would think that school districts, universities, government agencies, etc. would be better at acquiring/archiving/curating as-builts, especially for fire/life safety stuff, but they just aren't. And they're no better at ITM; I'd say rate of compliance with CA requirements for NFPA 25 runs 10% or less. Because plan review practices of state AHJ agencies are so strict, we unconditionally have to include exacting as-built information on our plans in order to submit and permit improvement projects. If you expand the spectrum of "missing calc cards/no as-builts" beyond just inspection-related issues, we probably do 20 survey and re-calc projects a year. Steve L. From: Sprinklerforum [mailto:[email protected]] On Behalf Of John Irwin Sent: Wednesday, November 21, 2018 3:25 AM To: [email protected] Subject: Calculation Plates 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
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