Is there any distance criteria maximum or minimum for the location of isolation valve from fire hydrant(isolation valve dedicated for fire hydrant).
Yes. A control valve installed on each private fire hydrant must be installed within 20 ft (6.1 m) of the hydrant in accordance with Section 18.104.22.168.1 of the 2016 NFPA 24, Standard for the Installation of Private Fire Mains and Their Appurtenances.
If connecting public fire hydrant to a public service main you should consult with the municipality's water utility regulations for the requirements.
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