The National Fire Protection Association‘s (NFPA) Standard Council has issued four Tentative Interim Amendments (TIAs) that address the use of antifreeze in fire sprinkler systems. The TIAs provide new requirements in NFPA standards for the use of antifreeze in both new and existing sprinkler systems. NFPA has also issued a new safety alert regarding the use of antifreeze in sprinkler systems. These actions come after extensive research and standards development activities to address concerns raised by the combustibility of antifreeze solutions in sprinkler systems.
- NFPA 13, Standard for the Installation of Sprinkler Systems (2010 edition)
- NFPA 13R, Standard for the Installation of Sprinkler Systems in Residential Occupancies up to and Including Four Stories in Height (2010 edition)
- NFPA 13D, Standard for the Installation of Sprinkler Systems in One- and Two-Family Dwellings and Manufactured Homes (2010 edition)
- NFPA 25, Standard for the Inspection, Testing, and Maintenance of Water-Based Fire Protection Systems (2011 edition)
- New systems are required to use only factory premixed antifreeze solutions. The maximum allowable concentration of glycerin for a new system is 48% by volume.
- The maximum allowable concentration of propylene glycol for a new system is 38% by volume.
- All factory premixed antifreeze solutions used in NFPA 13 and 13R systems must be provided with a certificate indicating the type of antifreeze, the concentration and the freezing point. Factory premixed antifreeze solutions of propylene glycol in excess of 40% by volume are permitted in ESFR (Early Suppression Fast Response) systems where the sprinklers are listed for such use in a specific application.
- Factory premixed antifreeze solutions other than propylene glycol and glycerin are permitted only where they are specifically listed for use in sprinkler systems.
- New systems, once installed, must be annually tested in the manner required for existing systems, summarized below.