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Section §173.136: Class 8-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 173.136 on the ECFR website

Interpretation Responses

Ref ID Date Company Name Individual Name Response Document
14-0052 Medivators Mr. Richard M. Ormsbee View
07-0012 HMT Associates Mr. E. A. Altemos View
00-0249 National Oceanic and Atmospheric Administration Mr. Dana Greeley View
06-0047 Tyco Specialty Products Ms. Nicole Curcio View
00-0288 Currie Associates, Inc. Mr. Jack Currie View
00-0214 Air Techniques, Incorporated Mr. Robert Kattke View
02-0093 U.S. Environmental Protection Agency Henry L. Longest View
13-0205 Reid laboratories LLC Mr. Scott Hopkins View
15-0081 LabelMaster Services Mr. Robert Richard View
10-0224 Corrigan Consulting, Inc. Mr. Wendell Honeycutt View
03-0191 Ondeo Nalco Company Ms. Alicia M. Shaban View
98-0232 Minntech Corporation Mr. Richard M. Ormsbee View
02-0281 Baff Incorporated John Rhodes View
06-0076 Regulatory Resources, Inc. Mr. Wade Winters  View
09-0267 ChemADVISOR, Inc. Mr. Kevin Lapp View
09-0306 Hazmat Resources, Inc. Mr. Danny Shelton View
08-0222 URS Corporation Ms. Erin N. Jarman View
01-0234 Mr. Lawrence W. Bierlein View
14-0081 Atotech USA Inc. Ms. Patricia Siefferman View
03-0321 Fisher Scientific Company, LLC Mr. John G. Mayfield View
13-0227 Shane Havoc Consulting, LLC Mr. Gregory Sutherland View
11-0105 DuPont Sourcing & Logistics Mr. Thomas Reese View
01-0235 Alliant Techsystems Inc. Mr. Christopher J. Widman View
11-0133 View