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Has anyone come across a dual riser (dual-feed) sprinkler system in an office tower, with only a single inspector's test? What is the proper method of testing each flow switch? In most cases, only the flow switch nearest the inspector's test will operate in a timely manner. Some inspectors will isolate and test, others believe the system should be tested under normal conditions with both control valves open. Is the deficiency the lack of a second test connection, or that the flow switch doesn't operate within 90 seconds (or even 5 minutes)? Alternatively, is there no deficiency at all? Sent in anonymously for discussion. Discuss This | Submit Your Question | Subscribe 
3 Comments
Dan Wilder
2/26/2021 09:59:09 am
Depending on the MFG, flow switches should activate with as little as 4GPM up to 10GPM....meaning even with both sides open, the working pressure could be as low as 7PSI with both a 5.6 & 4.2 K-factor orifice and still flow enough water to activate each switch. It is still a single system so one test connection to activate the switch (which is still downstream of each waterflow) is compliant. I do see an issue with only one switch activating while the other one doesn't from a testing (functionality) standpoint BUT the point of dual feeds is redundancy so as long as one flows, the intent is met.
Ben J Prince, RSE, CWBSP
2/26/2021 11:59:03 am
We have many dual fed systems in our area. That is one of the most objective and thorough responses I have heard. Great reply Dan.
Jesse
2/26/2021 12:57:36 pm
Great reply by Dan. Would echo what he wrote. Leave a Reply. |
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