Letters of Interpretation

PHMSA has published several Frequently Asked Questions (FAQs) documents on programmatic topics. Please review these documents here at: https://www.phmsa.dot.gov/about-phmsa/phmsa-faqs.

Additionally, Office of Hazardous Materials Safety has published Hazardous Materials FAQs based on letters of interpretation on the following topics:

Office of Hazardous Materials Safety: For questions about transporting hazardous materials, needing clarifications of the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180), or requesting a formal letter of interpretation, please go to the Hazardous Materials Information Center (HMIC) page for contact information (phone and email address).

Office of Pipeline Safety: A written regulatory interpretation, response to a question, or an opinion concerning a pipeline safety issue may be obtained by submitting a written request to the Office of Pipeline Safety (PHP–30), PHMSA, U.S. Department of Transportation, 1200 New Jersey Avenue SE., Washington, DC 20590–0001 or at the email address: pipeline_interp_submittal@dot.gov. In addition to email address, the requestor must include his or her return address and should also include a daytime telephone number. Requests should be submitted at least 120 days before the time the requestor needs a response. Note: electronic submission is provided as alternative to the 49 CFR Part 190.11(b) mail-in requirement.

This section of the website below provides the ability to find regulations information including regulations parts, content of sections, and interpretations for regulations sections. A list of parts, identified by the part number and subject is also provided. To browse sections by part, click on the subject link below. You will be taken to the eCFR website to view sections for a part.

The eCFR is also searchable by keyword and other available options on the eCFR website. To search and browse regulations using the eCFR website, use the link below. For assistance, please send an email to PHMSA.Webmaster@dot.gov.

Search the eCFR

Interpretations Reference #

Keyword Search Tip: Use quotation marks to search for commonly used phrases, such as “gas transmission” or “cargo tank motor vehicle.”

Part/Section #

Topic

Interpretations Reference #

Publish Date From E.g., 02/09/2021

Publish Date To E.g., 02/09/2021

Only Chief Counsel Responses

Ref ID:	Date Sort ascending	Company Name	Individual Name	Response Document
PI-77-014	05/01/1977	G&K Management Co., Inc.	Sherman Gardner	View
PI-77-011	04/15/1977		John W. Jewell	View
PI-77-0105	04/14/1977			View
PI-77-010	03/28/1977		James A. Long	View
PI-77-0104	02/25/1977			View
PI-77-0103	02/23/1977			View
PI-77-008	02/14/1977	Metallurgical Consultants, Inc.	T. V. Bruno	View
PI-77-006	02/02/1977	Piedmont Natural Gas Company, Inc.	E. L. Manning	View
PI-77-005	01/28/1977	Panhandle Eastern Pipe Line Company	Mr. Charles H. Kent	View
PI-77-004	01/27/1977	County of Fairfax	Fred K. Kramer	View
PI-77-003	01/26/1977	North Carolina Natural Gas Corporation	Arthur P. Gnann, Jr.	View
PI-77-0102	01/19/1977			View
PI-77-001	01/10/1977		Carl J. Stokes	View
PI-77-0100	01/07/1977			View
PI-76-081	12/28/1976	Board of the City of Florala	Joseph A. Cox	View
PI-76-080	12/22/1976	EXXON Pipeline Company	Roy R. Die	View
PI-76-077	12/15/1976	Memo: Internal		View
PI-76-079	12/15/1976	Memo: Internal	Richard E. Sanders	View
PI-76-078	12/15/1976		Bray	View
PI-76-076	12/09/1976	ASME Gas Piping Standards Committee	R. L. Dean	View
PI-76-075	12/07/1976	Memo: Internal	Marshall W. Taylor, II	View
PI-77-0101	12/06/1976			View
PI-76-074	12/03/1976		Herbert Schroeder, Jr.	View
PI-76-073	12/01/1976		E. A. Hamilton	View
PI-76-0117	11/29/1976			View
PI-76-072	11/24/1976	North Carolina Utilities Commission	R. J. Nery, Chief	View
PI-76-0116	11/10/1976			View
PI-76-071	11/02/1976	Arkansas Public Service Commission	Anthony Creston	View
PI-76-070	11/01/1976	Missouri Public Service Commission	Leonard M. Coffelt	View
PI-76-069	10/22/1976		F. Lucille Nesbit	View
PI-76-068	10/15/1976		TRANSPORTATION OF LIQUIDS BY PIPELINE	View
PI-76-067	10/14/1976	U.S. Department of the Army	J. E. Pate, Jr.	View
PI-76-066	10/04/1976	Memo: Internal		View
PI-76-065	09/30/1976	American Society of Mechanical Engineers	Manuel Gutierrez	View
PI-76-0115	09/28/1976			View
PI-76-064	09/20/1976	Union Real Estate Company	Victoria Bandi	View
PI-76-063	09/17/1976	Marshall, Hawks, McKinney & Hendrix	William T. Nichols	View
PI-76-062	09/17/1976	Western Mobilehome Association	Neil Y. Nordlander	View
PI-76-0114	09/16/1976			View
PI-76-061	09/15/1976	San Francisco Redevelopment Agency	Arthur E. Evans	View
PI-76-060	09/14/1976	Southview Investment Company	David Charness	View
PI-76-059	09/14/1976	Memo: Internal		View
PI-76-058	09/13/1976	Shulman & Rogers, P.A.	David A. Pordy	View
PI-76-057	09/10/1976	Yacht Harbor Mobile Park	Sam McNeill	View
PI-76-056	09/10/1976	IL Sorrento Mobile Home Park	Victor C. Nelson	View
PI-76-055	09/10/1976	City of Coalinga	Kenneth H. Valley	View
PI-76-054	09/10/1976	Clanton & Johnson	John W. Johnson	View
PI-76-053	09/09/1976	State of Alaska	Gordon T. Tyree	View
PI-76-0113	09/03/1976			View
PI-76-0112	09/02/1976			View

USA Banner

Letters of Interpretation