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Section §199.3: Definitions

Below are the available interpretations and guidance for the given section. To return to the list of parts, use the Parts link above. If you do not see any guidance or interpretation information below, that means there is none available for the given part/section. Return to the search page to browse additional regulations sections.

PHMSA has published several Frequently Asked Questions (FAQ) documents on regulatory topics. Please review our FAQ documents below:

Additionally PHMSA has Hazardous Materials FAQs based on letters of interpretation on the following topics:

This section of the website provides the ability to find regulations information including regulations parts, content of sections, and interpretations for regulations sections. Below is a list of parts, identified by the part number and subject. 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.

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: 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.

The regulations text of the section can be found on the eCFR website. To view the regulations text, use the link below. For assistance, please send an email to

View section 199.3 on the ECFR website

Interpretation Responses

Ref ID Date Company Name Individual Name Response Document
PI-19-0018 Fleetworthy Solutions Mr. Billy Stover View
PI-90-021 International Technology Corporation Kurt E. Krueger, CIH View
PI-91-027 View
PI-89-024 Hewlett-Packard Company James C. Powell View
PI-93-066 View
PI-90-025 Natural Gas of Milton Mary Beth LaCoste View
PI-93-068 View
PI-90-031 Taylor, Roth, Bush & Geffner Jay D. Roth View
PI-91-005 Oil, Chemical, & Atomic Workers International Union Dan C. Edwards View
PI-92-014 Lissie Corporation Edman R. Zink View
PI-90-033 One-Call Systems Kim Lilly View
PI-92-050 View
PI-90-032 Texas Excavation Safety System, Inc. Marvin R. Holland View
PI-92-048 Texas Association of Telephone Answering Services, Inc. (TATAS) View
PI-95-011 Northwest Natural Gas Company Deborah Jacobsen, R.N. View
PI-93-067 View
PI-94-007 View
PI-90-019 City of Palo Alto, CA Jay C. Rounds View
PI-94-008 View
PI-90-020 South Jersey Gas Company Thomas W. Worrell View
PI-94-013 View
PI-90-003 International Brotherhood of Electrical Workers Bill Quilhot View
PI-94-018 View
PI-90-011 State of California Public Utilities Commission Russell W. Copeland View
PI-96-025 Northern Indiana Fuel and Light Company, Inc. Pam Good View
PI-93-051 View
PI-94-002 View
PI-92-004 View
PI-90-015 Oregon Public Utility Commission H. R. Garabrant, P.E View
PI-90-018 IBEW - Local Union 1245 Jane Brunner View