Covers hose in sizes up to and including a nominal internal diameter of 4 inches (102 mm) for conducting liquefied petroleum gas intended to be installed in closed systems in compliance with American National Standard for the Storage and Handling of Liquefied Petroleum Gases, ANSI/NFPA 58-1992. The hose is made for a maximum working pressure of 350 pounds per square inch gauge (psig) (2400 kPa). Hose in sizes larger than 2 inches (50.8 mm) is not intended for use on reels. Hoses covered by this standard are intended for use at temperatures within the range of minus 40 C (minus 40 F) to plus 60 C (140 F), or minus 54 C (minus 65 F) to plus 60 C.
UL 21 BULLETINS-2002 history
2017UL 21 BULLETIN-2017 UL Standard for Safety LP-Gas Hose (COMMENTS DUE: June 19@ 2017)