Are there any drawbacks of testing a diesel-engine fire pump on a main header where other diesel pumps are connected to, instead of a test header?
This is happening in my plant because the test header is is large enough that it would require frequent throttling of test header discharge gate valves for each pump, which has started to wear out and not hold pressure. Also, what is the minimum flow requirement for weekly diesel pump testing considering the test header doesn't hold? Do we need to run 0%, 100%, and 150% flow test each week? Submitted anonymously and posted for discussion. Discuss This | Submit Your Question | Subscribe
4 Comments
Dan Wilder
10/26/2020 09:09:25 am
To answer your question, typically the length of the test header is limited to 15 feet or the supply piping to the test header must be increased by one pipe size (unless hydraulic calculations area provided). In addition, the actual pipe supply to the test header must meet sizing requirements per NFPA 20-Table 4.27 (I'm referencing the 16' edition but that sizing would apply to whenever your pump was installed).
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FRANK J. HERRICK
10/26/2020 10:22:29 am
I've found that the commonly used valves on a fire pump test header don't provide a positive lock.
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Franck
10/26/2020 11:55:54 am
As indicated by Dan, no need to test weekly at 0% and 100% and 150%.
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Jonathan Sullivan
10/26/2020 02:16:18 pm
This seems like a smart practice. What drives the requirement for the tank in EU?
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