by Steve Schulte, CHMM, CPP, DGSAOn January 18, 2017, the Pipeline and Hazardous Materials Safety Administration (PHMSA) issued an Advanced Notice of Proposed Rulemaking (ANPRM) HM-251D regarding the volatility of unrefined Petroleum products and Class 3 (flammable liquid) materials. See our previous blog, “U.S. PHMSA Advanced Notice of Proposed Rulemaking HM-251D Hazardous Materials”, posted on January 27, 2017, for additional information.PHMSA, at stakeholders’ requests, extended the original comment deadline on the ANPRM from March 20, 2017 to May 19, 2017.References:Department of Transportation, PHMSA. "Hazardous Materials: Volatility of Unrefined Petroleum Products and Class 3 Materials." Federal Register (January 18, 2017 and March 21, 2017): https://www.gpo.gov/fdsys/pkg/FR-2017-01-18/pdf/2017-00913.pdfhttps://www.federalregister.gov/documents/2017/03/21/2017-05488/hazardous-materials-volatility-of-unrefined-petroleum-products-and-class-3-materials