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NFPA 25 states that a 3-year full flow test for a dry sprinkler system should show no significant delay in water delivery time from previous tests.
What is considered a significant delay? Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
6 Comments
Glenn Berger
9/30/2024 08:22:31 am
"Significantly" is not defined in NFPA for this application but IMO if it is not a difference of a few seconds then I would not be concerned.
Patrick Drumm
9/30/2024 09:16:05 am
This would probably be a great "Expert of the Day" question to propose. Even going to the Merriam Webster's Dictionary does not give you enough insight to define what should be considered significant
Anthony L. Crispo
9/30/2024 09:30:53 am
My two cents would be a differential of an additional 15 seconds would be the start for a concern worth looking into. An additional 30~45 seconds I'd start writing a service order for internal pipe inspection and a corrosion mitigation report.
franck
9/30/2024 10:57:50 am
For most systems, the requirement is less than 1minute. But most systems are normally in the range 45 to 55 s. A 10 s additional delay is already more than +20%.
Jack G
9/30/2024 07:24:43 pm
I would go by the industry standard— more than 10%.
Pete D.
10/1/2024 07:10:50 pm
Many good answers. What is significant IMO as an engineer is a 10% or greater loss without a corresponding change in the water supply pressure or flow rate. This indicates an obstruction issue. What is also significant is a FDT delay beyond the prescribed time max requirements of the hazard classification or the performance based design, such as QUELL. Leave a Reply. |
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