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Section §173.301: General requirements for shipment of compressed gases and other hazardous materials in cylinders, UN pressure receptacles and spherical pressure vessels

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 173.301 on the ECFR website

Interpretation Responses

Ref ID Date Company Name Individual Name Response Document
23-0027 Electronic Fluorocarbons Mr. Jason Bombard, PE View
22-0035 Linde Gas & Equipment Inc. Mike Stephens View
20-0057 R&D Engineer Oliver Sánchez Muñoz View
17-0009 Airborne Labs International, Inc. Mr. Tony Amato View
18-0024 Versum Materials Richard Schuyler View
17-0120 Mihama Corporation View
17-0137 Precision Fabricators Ltd. David Diamond View
17-0129 United Brands Jimmy Zahriya View
17-0062 Carbotainer SL Antonio Ruiz View
98-0603 United Parcel Service Airlines Mr. Samuel S. Elkind View
12-0170 Sandler, Travis & Rosenberg, P.A. Mr. Mark Ludwikowski View
08-0221 URS Corporation Ms. Erin N. Jarman View
00-0271 ZAG Industries Mr. Miki Birnbaum View
10-0183 Air Liquide America Specialty Gases LLC Mr. Ralph Diaz View
11-0299 Mr. Paul J. Dambek     View
12-0172 Detector Electronics Corporation Mr. Lee R. Zwiefelhofer View
10-0190 PCS Sales USA, Inc. Mr. Tracey G. Smith View
13-0171 Aerospace Mr. Jeff Christafore View
12-0095 Guerilla Air Mr. Sam Newman View
15-0184 The Chemours Company Mr. Randolph Martin View
14-0123 Guerrilla Air/ Tiberius Arms Mr. Gio Islas View
00-0386 Safety & Compliance Associates, Inc Mr. Mike Lopez View
09-0222 FIBA Technologies, Inc. Mr. Christopher R. Adams View
07-0226 Mr. Dave Romanin View
17-0030 Quantum Fuel Systems Mr. Tae Kim View
13-0171 Aerospace Mr. Jeff Christafore View
00-0063 US Airways Ms. Zoe Abdul View
17-0059 FIBA Technologies Affairs Mr. Christopher Adams View
13-0006 Baker Hughes Mr. Aubrey R. Campbell View
10-0123 Cart, Inc. Mr. Sam Cook View
02-0080 Allied Universal Corp. Robin J. Eddy Bolte View
12-0236 Dynetek Industries Ltd. Mr. Stefan Frey View
02-0141 The Chlorine Institute, Inc. Gary F. Trojak View
13-0110 Kidde-Fenwal, Inc. Mr. Richard Lupien View
07-0233 Northern Air Cargo Mr. Mark Smith View
10-0045 Department of Ecology Mr. Gerald French View
08-0251 Barlen and Associates, Inc. Mr. William Barlen View
16-0196 PonyPak Mr. William Messner View
03-0323 Air Liquide America L.P. Mr. Ralph Diaz View
07-0154 American Cap Company Mr. Kerry Hricsina View
09-0148 Mr. Peter Collins U.S. Department of Justice Federal Bureau of Prisons View
13-0089 Plunkett Cooney Mr. Jerome A. Galante View
12-0086 Pelchem Mr. EG Valkenburgh View
12-0087 Hydro-Test Products, Inc. Mr. Tom Sauta View
09-0216 Ashtead Technology, Inc. Mr. Jason Miller View
15-0231 A.S. Trust & Holdings Mr. Richard Maruya View
06-0196 Quarles & Brady LLP Mr. Lars E. Guibrandsen View
13-0164 Mr. Cesar Enrico View
CHI-87-003 Lawrence W. Bierlein, P.C. Gordon Rousseau View
13-0224 Linde North America, Inc. Mr. Guy Dalton View
16-0010 Mr. Jason Miller View
12-0211 HAZMATEAM Mr. Paul Dambek View
10-0091 Mr. Juan Gonzalez View
04-0168 Florida House of Representatives The Honorable Julio Robaina View
10-0095 Mr. Bill Briner View
11-0103 Mr. Ed Van Schoick View
10-0100 Wilhelmsen Ships Service Mr. Dave Finlay View
13-0070 Safeway, Inc. Mr. David Tobin View
07-0118 Northwest Airlines Inc. Mr. David A. Tikaisky View
03-0203 Heritage Environmental Services, LLC-ETS Mr. David E. Blair View
17-0021 Phase Four, Inc. Mr. Daniel Nash View
01-0021 Airpack of Virginia, Inc. Mr. Hank Baird View
15-0102 Mallinckrodt Pharmaceuticals, formally Ikaria, Inc. Mr. Juan Miró View
07-0170 American Cap Co. L.L.C Mr. Kerry Hricsina View
11-0117 Worthington Cylinders Mr. Steve Gentry View
00-0103 Safety & Compliance Associates, Inc. Mr. Mike Lopez View
11-0058 Airspeed Press Mr. Steve Lindblom View
15-0135 HWN Resources, LLC. Audrey Hallinger View
11-0062 DuPont Company Mr. Randolph Martin View
01-0048 BOC Gases Mr. John M. Thompson View
10-0077 Thunderbird Cylinder Mr. Fred A. Nachman View