Firefighting

News In Brief

Issue 9 and Volume 154.

UL prohibits O-rings in sprinklers after Jan. 2003; adds sprinkler tests to UL 199 Underwriters Laboratories Inc. (UL) has revised UL 199, Standard for Safety for Automatic Sprinklers for Fire Protection Service, to prohibit the use of O-ring water seal constructions in sprinklers after January 2003. The revision was published July 9. The action follows a two-year UL-funded investigation of the field performance of sprinklers containing O-rings. The project included extensively examining, testing, and analyzing sprinkler samples from more than 200 locations across the country. The samples were from hospitals, schools, offices, warehouses, and residences. According to Jim Beyreis, UL’s vice president of global engineering, the research revealed that “some O-ring sealed sprinklers can degrade over time due to corrosion or buildup of minerals, salts, and other elements in water that could affect how the sprinklers activate in a fire.” The revised UL standard incorporates the following additional tests: a…

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