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Section §173.137: Class 8-Assignment of packing group

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 173.137 on the ECFR website

Interpretation Responses

Ref ID Date Company Name Individual Name Response Document
11-0158 Corrosion Testing Laboratories, Inc. Mr. Bradley D. Krantz View
05-0307 Food Products Association Mr. Richard N. Jarman View
01-0135 Anne N. Christenson, Esq. Law Office of Fe nne more Craig View
01-0231 Hunt ShipMate, Inc. Mr. Steven Charles View
05-0175 Kaivac, Inc. Mr. Bob Robinson, Sr. View
08-0207 Cognis Oleochemicals LLC Mr. Sam Ghantous View
13-0205 Reid laboratories LLC Mr. Scott Hopkins View
15-0081 LabelMaster Services Mr. Robert Richard View
02-0315 Keller and Heckman LLP Mr. Terrence D. Jones View
14-0052 Medivators Mr. Richard M. Ormsbee View
08-0103 Anodamine, Inc. Mr. Paul R. Hattingh View
11-0133 View
08-0108 Brenntag Mid-South, Inc. Mr. A.B. Eargood View
13-0227 Shane Havoc Consulting, LLC Mr. Gregory Sutherland View