# Transport Canada/Government of Canada — Hazardous Materials Safety Interpretation - **operation:** document - **citation:** 23-0026 - **title:** Transport Canada/Government of Canada — Hazardous Materials Safety Interpretation - **source type:** guidance - **agency:** Pipeline and Hazardous Materials Safety Administration - **status:** guidance - **official:** true - **published on:** 2024-08-06 - **effective on:** Not available - **summary:** 23-0026 response to Transport Canada/Government of Canada concerning 171.23, 171.7, 173.301. - **machine formats:** - **json:** https://regulus.evalyn.ai/document/phmsa-interpretation-23-0026.json - **markdown:** https://regulus.evalyn.ai/document/phmsa-interpretation-23-0026.md - **app url:** https://regulus.evalyn.ai/document/phmsa-interpretation-23-0026 - **source url:** https://www.phmsa.dot.gov/sites/phmsa.dot.gov/files/2024-08/230026.pdf **body:** <<>> U.S. Department of Transportation Pipeline and Hazardous Materials Safety Administration 1200 New Jersey Avenue, SE Washington, DC 20590 August 6, 2024 Mr. Kurt Sieloff Regional Transportation of Dangerous Goods Inspector Transport Canada/Government of Canada 100 Princess Street, Unit 360 Thunder Bay, Ontario Canada Reference No. 23-0026 Dear Mr. Sieloff: This letter is in response to your March 10, 2023, email requesting clarification of the Hazardous Materials Regulations (HMR; 49 CFR Parts 171-180) applicable to CG-7 pressure relief valves and the definition of industrial motor fuel. In your email, you reference § 173.301(f), which incorporates by reference Compressed Gas Association (CGA) publication S-1.1 (2011), and thus requires pressure relief devices to comply with the CGA pamphlet on pressure relief device standards. We have paraphrased and answered your questions as follows: Q1. You ask whether CG-7 pressure relief valves commonly found on 20, 40, 60, and 100 pound propane cylinders require requalification if they are not used in “industrial motor fuel” service. A1. The answer is no. Paragraph 9.1.1 in CGA S-1.1 states that CG-7 pressure relief valves (other than those used in industrial motor fuel service) shall be replaced or requalified within 10 years of the valve’s manufacture date. However, § 173.301(f)(1) states that “except as provided in paragraphs (f)(5) through (f)(7) and (j) of this section, and § 171.23(a) of this subchapter, a cylinder filled with a gas and offered for transportation must be equipped with one or more pressure relief devices sized and selected as to type, location, and quantity, and tested in accordance with CGA S-1.1 (compliance with paragraph 9.1.1 is not required)1 and CGA Pamphlet S-7 (IBR, see § 171.7 of this subchapter).” As noted in your incoming email, your CG-7 pressure relief valves meet the exception provided by § 173.301(f)(1) of not requiring requalification in paragraph 9.1.1 of CGA S-1.1. Q2. You ask whether PHMSA can provide a definition for “industrial motor fuel.” 1 https://www.ecfr.gov/current/title-49/part-173/section-173.301#p-173.301(f)(1) <<>> A2. While there is no definition for “industrial motor fuel” in the HMR or CGA S-1.1, the intent behind paragraphs 9.1.1 and 9.1.2 of CGA S-1.1 was to correspond with National Fire Protection Agency (NFPA) publication 58, paragraph 5.9.2.14. This paragraph states that “all cylinders used in industrial truck service (including forklift truck cylinders) shall have the cylinder’s pressure relief valve replaced by a new or unused valve within 12 years of the date of manufacture of the cylinder and every 10 years thereafter.” I hope this information is helpful. Please contact us if we can be of further assistance. Sincerely, Eamonn Patrick Acting Chief, Regulatory Review and Reinvention Branch Standards and Rulemaking Division <<>> 23-0026 Wolcott From: Foster, Glenn (PHMSA) To: Pollack, Arthur (PHMSA) Subject: FW: 49 CFR 173.301(f) - Confirmation Date: Wednesday, March 22, 2023 8:37:27 AM From: INFOCNTR (PHMSA) Sent: Tuesday, March 21, 2023 10:51 AM To: Dodd, Alice (PHMSA) Cc: Hazmat Interps Subject: FW: 49 CFR 173.301(f) - Confirmation Hi Alice, Please see the below interpretation request and attached pictures. Let us know if you need anything. Regards, -Breanna From: Sieloff, Kurt Sent: Friday, March 10, 2023 4:44 PM To: PHMSA HM InfoCenter Subject: 49 CFR 173.301(f) - Confirmation CAUTION: This email originated from outside of the Department of Transportation (DOT). Do not click on links or open attachments unless you recognize the sender and know the content is safe. UNCLASSIFIED / NON CLASSIFIÉ Good afternoon, I would like to seek confirmation of the requirements of 49 CFR 173.301(f). Please confirm that CG-7 pressure relief valves commonly found on 20lb, 40lb, 60lb and 100lb propane cylinders do not require replacement or requalification if they are not used in industrial motor fuel service. Attached are pictures of this style of pressure relief valve; the valve and pressure relief device are combined in one device. <<>> Additionally, can you provide a definition of “industrial motor fuel”. Please feel free to contact me should you have any questions. Sincerely, Kurt Sieloff Regional Transportation of Dangerous Goods Inspector, Ontario Region Transport Canada / Government of Canada kurt.sieloff@tc.gc.ca / Tel : 807-621-9052 Inspecteur régional du transport des marchandises dangereuses, Région de l’Ontario Transports Canada / Gouvernement du Canada kurt.sieloff@tc.gc.ca / Tél. : 807-621-9052 <<>> GUSIED 973031 6122021 <<>> glasstbay.ca ON • 345-4527 (C ADIST ODS 4527 (GLAS) odO - **truncated:** false - **body characters:** 4856