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Section §178.274: Specifications for UN portable 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.

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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 178.274 on the ECFR website

Interpretation Responses

Ref ID Date Company Name Individual Name Response Document
22-0129 American Bureau of Shipping Ms. Simone Goncalves View
21-0043 American Bureau of Shipping Simone Goncalves View
18-0090 American Bureau of Shipping (ABS) Mr. Michael R. Kloesel View
18-0099 Lloyd Register View
17-0046 TT Club Mr. Michael Yarwood View
13-0151 Apragaz V.Z.W. Uw Controle Organisme Mr. Chris Vleugels View
13-0159 Albermarle Corporation Mr. Brad Thomas View
10-0195 National Oilwell Varco Jianke Wang, Ph.D., P.E. View
07-0147 Fort Vale Engineering Ltd. Mr. Dave Bailey View
07-0147R Fort Vale Engineering Limited Mr. Dave Bailey View
08-0197 Silver/Cims LLC Mr. Jim Silver View
10-0137 National Oilwell Varco Mr. Jianke Wang, PH D, PE View
08-0157 HMT Associates, L.L.C. Mr. E.A. Altemos View
16-0063 The Dow Chemical Company Mr. John Jeater View