NFPA 750 , 2019
STANDARD ON WATER MIST FIRE PROTECTION SYSTEM
The 2019 edition of NFPA 750 contains updates that clarify the definitions of a gridded water mist system and twin-fluid system, which devices can be used as automatic means, which components can be used as provisions for cleaning, and the requirements for pressure-indicating devices used on a common manifold system.
Further updates clarify that a listed system requires that any mixed components or systems have been tested together and expand requirements to include configurations allowed in current listed solutions.
New sections have been added specifying design, testing, and installation of pre-action water mist systems. Another section has been added to prevent debris and contaminants from entering a water mist system by requiring a strainer or filter after the fire department connection (FDC). It also clarifies the location of the FDC on a low pressure water mist system. Throughout the standard, the terms pressure container and pressurized container have been replaced with the newly defined term pressure vessel, and the phrase safety device to release excess pressure has been replaced with pressure relief
device.
These changes were made to maintain consistency with industry practices and terminology. This edition also incorporates revisions that update referenced documents, extracts, and formatting to comply with the Manual of Style for NFPA Technical Committee Documents.
These changes were made to maintain consistency with industry practices and terminology. This edition also incorporates revisions that update referenced documents, extracts, and formatting to comply with the Manual of Style for NFPA Technical Committee Documents.
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