USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation

General

Legacy ID
16
Show Effective Date
Off
Significant Regulatory Guidance
No
Subscribe to General

Valve Rule Fact Sheet

Objectives

The Pipeline and Hazardous Materials Safety Administration (PHMSA) is finalizing regulations to improve pipeline operator responses to large-volume, uncontrolled pipeline releases that may occur during the operation of certain large-diameter (6 inches or greater) onshore natural...

New HAZMAT Research Reports

PHMSA’s Hazardous Materials Research, Development and Technology team recently completed two new reports analyzing the potential safety impacts associated with changing the concentration of fine grain metal powders used in pyrotechnics and the risks associated transporting aerosols.  ...

Aerosol Transportation Risk Assessment

PHMSA contracted with the Cambridge Systematics Team to complete an Aerosol Risk Assessment. The purpose of this assessment was to determine if the United Nations Model Regulations' definition of aerosols maintain an equivalent level of safety to the Hazardous Material Regulations' (HMR)...

Fine Grain Metal Powder Final Report

Under contract with PHMSA, A-P-T Research, Inc. conducted research and testing for a variety of percentages of fine grain metal powders in pyrotechnic compositions (specifically in burst charges) to identify the potential safety impacts on hazard classification when changing the concentration of...

Freeport LNG Frequently Asked Questions

Q1.  What is the status of Freeport LNG’s Remedial Work Plan (RWP)? 

A1.  The operator is submitting the RWP incrementally to PHMSA, as permitted under the August 3, 2022 Consent Agreement and Order executed between PHMSA and the operator. PHMSA is accepting and...

Freeport LNG RCFA

As required by paragraph 14 of the Consent Agreement and Order (4-2022-051-NOPSO), Freeport LNG (Freeport) submitted its Root Cause Failure Analysis (RCFA) to PHMSA. Freeport has requested confidential treatment of the RCFA in accordance with PHMSA regulations in 49 CFR § 190.343, including...