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General

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Stakeholder Documents - Advisory Bulletin ADB-10-03

PHMSA issued advisory bulletin ADB-10-03 to notify owners and operators of recently constructed large diameter natural gas pipeline and hazardous liquid pipeline systems of the potential for girth weld failures due to welding quality issues. Misalignment during welding of large diameter line...

Underground Natural Gas Storage: Key Documents

Safety of Underground Natural Gas Storage Facilities: Interim Final Rule

On December 19, 2016, PHMSA published in the Federal Register an Interim Final Rule (IFR) that revises the Federal pipeline safety regulations to address critical safety issues related to downhole facilities, including wells...

Risk Modeling Work Group Overview

The PHMSA Pipeline Risk Modeling Work Group was formed as a follow up to the September 2015 Pipeline Risk Modeling Methodologies Public Workshop. The purpose of the group is to provide technical, integrity management and operational input to PHMSA to aid in the development of a pipeline system...

Class Location Special Permits

Welcome. This site is administered by the Pipeline and Hazardous Materials Safety Administration (PHMSA), and provides information concerning applications for special permits to operate certain gas transmission pipelines at pressures based on previous class location designation, under...

Pipeline Enforcement Guidance

Enforcement Guidance documents are available to clarify PHMSA's enforcement authority by identifying and summarizing precedent, including those from interpretations, advisory bulletins, final orders, and decisions on petitions for reconsideration.  The material contained in these documents describe the practices used by PHMSA personnel in undertaking their compliance, inspection, and enforcement activities.  This guidance facilitates improved enforcement consistency and is particularly helpful when precedence exists for clarifying performance-based requirements. 

Locations

Underground Natural Gas Storage: Facility Locations

The following map shows the various types and locations of U.S. underground natural gas storage facilities. (Map courtesy of U.S. Energy Information Administration.)