For small building renovations, when do you (as a review engineer or AHJ) require hydraulic calculations to be provided?
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11 Comments
Eric
8/24/2017 09:02:32 am
Occupancy change, system modifications, size of renovation. If it is a small renovation (of say 10 sprinklers), no occupancy change and the heads are just relocated one for one (i.e. for spacing purposes or a new ceiling), it may not be worth the calculation. Depends on your comfort level.
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Mark Ma
8/24/2017 09:32:43 am
In all SF bay area cities, if any TI project involve using a flexhead connection in the fire sprinkler system, a hydraulic calculation will be required.
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Bobby
8/24/2017 06:28:15 pm
Calculations required when the sprinkler renovations exceed what the original system was designed for. This includes:
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Nimal Tissa Wijetunga
8/25/2017 04:13:59 am
Hydraulic Calculation is required except Pipe Schedule method.
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Sam
8/25/2017 10:39:58 am
Hydraulic calculations are required due to renovations:
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JOHNATHAN
1/4/2019 07:23:31 am
I love how people are only stating opinions and no one quotes the standard. I wouldn't validate any of the responses unless I am provided with a Code Section
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Heber Cuellar
4/13/2020 07:46:26 am
Hello Jonathan,
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Haus Douglas
7/16/2020 11:53:14 am
There is no section in NFPA 13 or elsewhere telling you when to re-calculate. All of the above answers are correct in the sense that ultimately it's a prudential judgement based upon many factors.
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Thomas Bender
1/28/2021 01:08:17 pm
According to NFPA 13 (2013 and 2016 editions): the section dealing with modifications to existing hydraulic systems is:
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Andrew MacLean
7/18/2023 10:07:26 am
8.15.20.5 is specifically looking at requirements for goose necks. Essentially looking at going from Upright to Return Bends. It means if you can prove there isn't a significant system loss from the goose necks you don't need a full new hydraulic calculation on the system refit.
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