USA Banner

Official US Government Icon

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure Site Icon

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

U.S. Department of Transportation U.S. Department of Transportation Icon United States Department of Transportation United States Department of Transportation


Section §171.22: Authorization and conditions for the use of international standards and regulations

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 171.22 on the ECFR website

Interpretation Responses

Ref ID Date Company Name Individual Name Response Document
23-0104 Chevron Phillips Chemical Company LP Richard Norl Jr. View
23-0078 Public Utilities Commission of Ohio Tom Forbes View
21-0062 Institute of Makers of Explosives Susan JP Flanagan View
21-0064 Ocean Network Express (North America) Inc. Lisa Stone View
21-0012 RCS RMS Inc. Donna Adams View
20-0081 Stablex US ecology Pierre-Olivier Gagné View
20-0068 Zoll Medical Corporation George Cole View
19-0077 LANXESS Solutions, US, Inc. Ernest Marcel View
20-0020 Environmental Resource Center Ms. Kristie Absher View
19-0072 C. Steinweg, Inc. John Moors View
17-0100 Lockhead Martin Aeronautics Company Rebecca Stokes View
12-0020 Federal Railroad Administration Mr. Dennis Campbell View
10-0249 Manager Cytec Industries, Inc. Mr. Charles Schreier View
14-0100 Gruene Environmental Companies Mr. Kitt Ferraz View
08-0190 Cytec Industries, Inc. Mr. James Sompii View
11-0199 Trimac Management Services Mr. Len Comtois View
14-0104 Trident Safety Group Mr. Richard J. Walsh View
14-0021 Lufthansa Cargo the Americas Mr. Hilmar Leng View
09-0164 Cytec Industries Inc. Mr. Andrews Bethmann View
10-0187 Schlumberger Technology Corporation Mr. Paul Lezak View
11-0164 UPS Mr. Samuel Elkind View
11-0011 Sunny Point Military Ocean Terminal - DSN 488 Ms. Lonnie Burks View
15-0166 ICC Compliance Center Ms. Sändra Miller View
14-0077 FX Training & Research Mr. Tassilo Baur View
11-0013 Transportation Management Group, Inc. Mr. John M. Domutz View
16-0195 CARGOpak Corp. Mr. Robert Smith View
07-0232 Alaska Airlines, Inc. Mr. Michael Tobin, CHMM View
15-0180 COSMO International Corporation Patricia M. Sobel View
15-0217 Wacker Chemical Corporation Mr. Michael Strong View
15-0204 Crowley Liner Service Mr. Michael Lesser View
11-0288 Diamon-Fusion International, Inc. Ms. Ana Zax View
08-0225 Currie Associates, Inc. Mr. Jack Currie View
14-0210 Brian Kurtz Trucking Ltd. Mr. David Skater View
13-0097 BASF Corporation Mr. Joseph Matousek View
14-0149 Mr. Armando Sancerni View
08-0118 Seaboard Marine Ltd. Mr. John Plasencia View
11-0283 R & L Carriers, Inc. Mr. Gerald A. Krisa View
11-0144 Chart Industries, Inc. Mr. Marty Beyer View
16-0012 Patterson Companies, Inc Mr. Robb Boros View
09-0118R HOYER Global Transport BV Mr. Peter Hordijk View
11-0314 BioStorage Technologies Ms. Darcy Britt View
08-0086 EnerSys Mr. Tom Biello View
15-0045 Northern Air Cargo Mr. Mark Smith View
13-0214 3M Mr. Todd Strobe View
09-0240 Dangerous Goods of America Mr. Fred A. Romero View
11-0252 Diamon-Fusion International, Inc. Ms. Ana Zax View
09-0122 Mr. Bill Lewis YRC Reimer View
07-0236 Northern Air Cargo Mr. Mark Smith View
13-0020 Cytec Industries, Inc. Mr. Dwayne McNally View
15-0219 Intelligent Energy Mr. Douglas Knight View
15-0205 Air General Inc. Mr. Dennis Franco View
09-0045 DuPont Sourcing & Logistics Mr. Thomas Reese View
10-0094 Akzo Nobel Chemicals, Inc. Mr. Mark A. Connolly View
10-0048 Department of National Defence Captain E.M. Steele View
10-0065 TSO3, Inc. Mr. Jean-Martin Vallières View
15-0044 Northern Air Cargo Mr. Mark Smith View
08-0150 Mr. William J. Briner View
16-0005 CMA CGM (America), LLC. Mr. Chris Godfrey View
14-0238 Surface Deployment and distribution Command Mr. Marco Boasso View
13-0054 TOM DOLCE Training Associates Mr. Thomas Dolce View
09-0035 Rohm and Haas Chemicals Mr. Vitaly Volfson View