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Section §173.222: Dangerous goods in equipment, machinery or apparatus

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 173.222 on the ECFR website

Interpretation Responses

Ref ID Date Company Name Individual Name Response Document
20-0096 NEX-XOS Worldwide, LLC Saul Mishkin View
18-0082 Mr. Tom Boyd View
09-0113 Murphy Industries Ms. Alecia Rice View
08-0185 EHS Associates, Inc. Mr. Daniel J. Young View
15-0191 Graco, Inc. Mr. Eric Lillyblad View
14-0205 RMS Interests, LLC Ms. Robin Smith View
02-0137 Singapore Airlines Ltd MuthusamyChandran View
12-0037 Naval Ordnance Safety and Security Activity Mrs. Karen Bonnin View
14-0146 Det-Tronics Mr. Lee Zwiefelhofer View
06-0257 Broco, Inc. Mr. Tom Joos  View
15-0243 Environmental Health & Safety Ms. Marilyn Winterburg View
05-0123 Currie Associates, Inc. Mr. Eric Adair  View
08-0146 L-3 Vertex Aerospace LLC Mr. Stephen W. Miller View