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Section §173.156: Exceptions for limited quantity and ORM

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 173.156 on the ECFR website

Interpretation Responses

Ref ID Date Company Name Individual Name Response Document
22-0053 Alston & Bird Meaghan G. Boyd View
10-0113 Currie Associates, Inc. Mr. S.C. Watkins View
16-0059 Ningbo Zhengxin Fire Fighting Equipment Co., Ltd Mr. Jacky Xie View
00-0244 Infotrac, Inc. Mr. Jason Kob View
14-0018 URS Corporation Mr. Andy N. Romach View
13-0019 G2 Revolution LLC Mr. Troy Erickson View
02-0212 Wal Mart Stores Sue Eaton View
06-0152 Hunton & Williams LLP Mr. Brooks M. Smith  View
13-0241 S.C. Johnson & Son, Inc. Ms. Georgia Barr View
02-0045 HB Fuller Company Gene Seco View
14-0195 The Clorox Company Mr. Maurice C. Carson View
09-0204 Applied Cleaning Technologies, Inc. Mr. Paul A. Ackermann View
10-0164 Edgcomb Law Group Mr. John Edgcomb View
10-0030 Environmental Scientist URS Corporation Ms. Erin N. Jarmin View
05-0315 Global Logistics Services Ms. Joan M. Boardman View
05-0313 Chevron U.S.A. Inc. Ms. Patricia E. Lin View
10-0093R Edgcomb Law Group Mr. John Edgcomb View
06-0233 Air-4Life, Ltd. Mr. Eric Kimel View
14-0142 Transportation Compliance Associates, Inc. Mr. Mike Alston View