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Section §173.132: Class 6, Division 6.1-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 173.132 on the ECFR website

Interpretation Responses

Ref ID Date Company Name Individual Name Response Document
16-0116 UL Supply Chain & Sustainabilty Kevin Skerrett View
99-0218 Cerac Incorporated Mr. Gerry Manley, CHMM View
15-0122 Hazmateam, Inc Mr. Paul Dambek View
13-0188 Legend, Inc. Mr. Don Collier View
10-0012 Detector Electronics Corporation Mr. Jon Varner View
99-0240 Dangerous Goods of America, Inc. Mr. Valois Pagan III View
05-0261 General Chemical Ms. Kathleen Nese View
00-0055 Lead Industries Association, Inc. Mr. Jeffrey T. Miller View
03-0288 Huntsman Corporation Mr. Philip Abraham View
04-0285 The Field Museum Ms. Jolynn Parchen View
05-0147 Swidler Berlin, LLP Mr. Robert N. Steinwurtzel View
04-0017 Regulatory Resources, Inc. Mr. Wade A. Winters View
14-0081 Atotech USA Inc. Ms. Patricia Siefferman View
11-0076 Con-way Freight Mr. Keith Jesse Powell View
14-0008 Patterson Companies, Inc Mr. Robb Boros View
13-0073 Aceto Corporation Ms. Suhey Francisco View
13-0076 Patterson Companies, Inc. Mr. Robb Boros View