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Section §173.302: Filling of cylinders with nonliquefied (permanent) compressed gases or adsorbed gases

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 173.302 on the ECFR website

Interpretation Responses

Ref ID Date Company Name Individual Name Response Document
00-0149 Smurfit-Stone Container Corporation Mr. Steven Pfeiffer View
06-0064 Catalina Cylinders Mr. E.A. Ward Dekker, Jr View
15-0094 Viking Packaging Mr. Les Adolph View
11-0175 NitroxFox LLC. Mr. John Fox View
15-0041 Bombardier (Aerospace) Mr. Jeff Christafore View
12-0236 Dynetek Industries Ltd. Mr. Stefan Frey View
10-0215 Pimpelmees 3 Mr. Gilbert de Chauvigny de Blot View
14-0211 Peroxy Chem Mr. Ralph Mikida View
03-0159 Airgas, Inc. Mr. John Anderson View
09-0223 Hydrotest Tech. Mr. David A. Wright View
14-0169 A.S. Trust & Holdings, Inc. Mr. Richard Maruya View
13-0164 Mr. Cesar Enrico View
11-0238 NitroxFox LLC. Mr. John Fox View
11-0290 Department of the Army Ms. Sarah Gedrich View
12-0147 The Govmark Organization, Inc. Mr. Salvatore Messina View
12-0076 Hazardous Control Inc. Ms. Nina Ximena Artime View
11-0274R Department of the Army Ms. Sarah Gedrich View
15-0102 Mallinckrodt Pharmaceuticals, formally Ikaria, Inc. Mr. Juan Miró View
14-0063 Texas Trailer Corp. Mr. Ray Williams View
15-0135 HWN Resources, LLC. Audrey Hallinger View
10-0040 University of Wisconsin Radiation Calibration Laboratory Ms. Wendy S. Kennan View