The following Frequently Asked Questions (FAQ) are based on historical letters of interpretation (LOI) applicable to the Hazardous Materials Regulations (HMR). The LOI have been issued to specific stakeholders and the FAQ are...

In accordance with the provisions of 49 U.S.C. § 5103(c), the Associate Administrator for the Office of Hazardous Materials Safety within the Pipeline and Hazardous Materials Safety Administration (PHMSA) hereby declares that an emergency exists that...

The Onshore Gas Gathering FAQs for Type C and Type R Pipelines include general guidance on gas gathering and specific guidance on requirements applicable to Type C and Type R gathering lines.

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The Pipeline and Hazardous Materials Safety Administration (PHMSA) is issuing this safety advisory notice to request that consumers, retailers, shippers, and DOT-regulated entities ensure their cylinders containing hazardous gases are in compliance...

The Onshore Gas Gathering FAQs for Type C and Type R Pipelines include...

PHMSA currently incorporates by reference into 49 CFR Parts 192, 193, and 195 all or parts of more than 80 standards and specifications...