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Section §172.331: Bulk packagings other than portable tanks, cargo tanks, tank cars and multi-unit tank car tanks

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 172.331 on the ECFR website

Interpretation Responses

Ref ID Date Company Name Individual Name Response Document
23-0052 Dayton Freight Lines, Inc. Justin Sharkey View
18-0005 Commerical Vehicle Safety Alliance Collin Mooney View
15-0120 Daniels Training Services Daniel Stoehr View
13-0206 Commerical Motor Vehicle Roadside Inspection Mr. William Scott Burson View
14-0183 Denton Police Department Mr. William Burson View
98-0044 Transportation Technology Center, Inc. Mr. W. J. Oertly View
16-0177 Robinson Nevada Mining Company Mr. Matt Thompson View
07-0098 Brenntag Southeast, Inc. Mr. Bruce Biehl View
05-0051 Georgia Department of Motor Vehicle Safety Capt. Bruce Bugg View
16-0004 Texas Department of Public Safety Trooper Kelley F. McClatchy View
16-0081 N&M Transfer Co.,Inc. Mr. Cary Krickeberg View
16-0004 Texas Department of Public Safety Trooper Kelly F. McClatchy View