I´ve searched for minimum water suppy for private hydrant in NFPA24, but it´s not there. Can I consider a private hydrant a Class I standpipe and use 30 minutes for water supply like NFPA14 9.2 indicates? I´m considering 500gpm in both.
NFPA 24 2010 edition 5.2.1 Pipe smaller than 6 in. in diameter shall not be installed as a private service mains supplying hydrants.
7.1.1 Hydrants shall be of an approved type and have not less than a 6 in. diameter connection with the mains.
After further reading of your question if you are referring to a minimum fire flow for the sizing of the private service main then you must determine the minimum required fire flow for whatever structure the service is for. You would use the worst case scenario of all the buildings (the worst single structure scenario) by the total square footage and construction type and use NFPA 1 18.4.5 to determine the required fire flow. Then utilizing Table 10.10.2.1.3 of NFPA 24 2010 edition or the same table in a different edition to determine the required size of pipe for the main. It will be at least 6 in. for hydrants.
Thank you, this was very helpful. I´m using NFPA 23 2016 edition. But the tables are still there (with few variants).
The table you mentioned is used for determining the flow rate of water required for flushing operation , not for sizing the mains.
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