On December 13, 2016 (81 FR 90061), the Pipeline and Hazardous Materials Safety Administration (PHMSA) published a safety advisory notice in the federal register to inform offerors and users of DOT Specification 39 (DOT–39) cylinders that DOT–39 cylinders with an internal volume exceeding 75 cubic inches (in3) (1.23 L) should not be filled with liquefied flammable compressed gas. PHMSA maintains filling or transporting DOT–39 cylinders with an internal volume exceeding 75 in3 (1.23 L) is not safe. The release of a liquefied flammable compressed gas from or rupture of such a cylinder having an internal volume exceeding 75 in3 (1.23 L) is a safety concern that could result in extensive property damage, serious personal injury, or even death. A liquefied flammable compressed gas has a stored energy that is several times greater than that of a non-liquefied compressed gas. Click on the link below to download the full version:

PHMSA 12-13-2016 DOT-39 cylinder safety notice