On April 24, 2017 (82 FR 18967), the Pipeline and Hazardous Materials Safety Administration (PHMSA) published a safety advisory notice in the federal register to address concerns of offerors and users of DOT Specification 39 (DOT-39) cylinders that exceed 75 cubic inches (in3) (1.23 L) and to provide clarification of the initial safety advisory notice (81 FR 90061) PHMSA issued on this subject on December 13, 2016 (Notice No. 2016-14). DOT-39 cylinders exceeding 75 in3 (1.23 L) should not contain liquefied flammable compressed cyclopropane, ethane, or ethylene, or liquefied petroleum gases. PHMSA advises against the filling or transporting of these gases in DOT-39 cylinders when the cylinder’s internal volume exceeds 75 in3 (1.23 L). Click on the link below to download the full version:

PHMSA 04-24-2017 safety advisory DOT-39 cylinders