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We have a fully-sprinklered building which also has 1-1/2" hose stations.
Are the hydraulic calculations required to include the hose stream (65 psi and flow) in addition to the sprinkler system, or can it be a separate calculation entirely (like standpipes)? Thanks for all responses. Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
7 Comments
Glenn Berger
5/19/2021 08:13:17 am
NFPA 13 does require the inclusion of a minimum flow rate in hydraulic calculations. The only exception is if the hose streams will be supplied by a completely separate water source. The location of where to add the hose allowance into the calculations can be up to the designer or the AHJ.
Franck
5/19/2021 08:19:48 am
It is normally 100 gpm for hoses (2 or more installaed on the same system) when you don't have hydrants fed by the same water supply. 50 gpm if you only have one hose fed by the system.
Cliff Schulze
5/19/2021 08:21:08 am
NFPA requires 50 gpm for one and a maximum of 100 gpm to be added for inside hose at the point of connection. The additional flow can be added at the pressure required by the sprinkler system design at that point.
Joshua Freedman
5/19/2021 11:07:33 am
NFPA 13 (2016) has the table 11.2.3.1.2 that lists hose requirements. The placard can have the sprinkler and hose demands combined or separated out. Inside and outside hose is typically 100 gpm for light, 250 gpm for ordinary hazard, 500 gpm for extra hazard or storage for most system types (ESFR have different hose requirements). I believe that unless the hose stations are coming from an entirely separate water supply from the sprinkler system it would need to be included in the demand.
Franck
5/20/2021 01:04:21 am
The 100, 250 and 500 are for combined hydrants + inside hoses or hydrants only. If the water supply is for sprinkler + inside hose only, then the additional demand is 50 gpm for one hose installed and 100 gpm when 2 or more inside hoses are provided.
sean
5/19/2021 08:23:10 pm
what you appear to be describing is a standpipe, 65 psi was the old standard for standpipes. these are calculated independent of NFPA 13 requirements. You would then follow the NFPA rules for hose stream
Kassem Daher
5/20/2021 06:55:07 am
The hose stream allowance shall be added to the sprinkler demand as per NFPA 13, this will address the flow requirement. In terms of pressure, shall the hose reel (1.5'' connection) with minimum 65 psi also be included with the sprinkler hydraulic calculation, considering the sprinklers at the area of operation and most remote hose reel are working simultaneously or, a separate calculation for hose reel system shall be performed to check the pressure at the 2 most remote hose reels with 50 gpm @ 65 psi each, apart from sprinkler calculation? Leave a Reply. |
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