The new editions of the following standards have been developed by the Canadian Standards Association's (CSA) Technical Committee on Cylinders, Spheres, and Tubes for the Transportation of Dangerous Goods and were published in January 2025:
- CSA B339 "Cylinders, spheres, and tubes for the transportation of dangerous goods"
- CSA B340 "Selection and use of cylinders, spheres, tubes, and other containers for the transportation of dangerous goods, Class 2"
- CSA B341 "UN pressure receptacles and multiple-element gas containers for the transport of dangerous goods"
- CSA B342 "Selection and use of UN pressure receptacles and multiple-element gas containers for the transport of dangerous goods, Class 2"
On this page
- Coming into force
- Most notable changes
- Accessing the new standard
- Participating in the development of future editions of these standards
- Contact us
Coming into force
In accordance with Section 1.3.2 of the TDG Regulations, these newly published standards come into force on 1 August, 2025, however, stakeholders may begin transitioning to these new standards at any time before this date.
Most notable changes
The most notable changes that appear in the new editions of these standards are summarized below.
CSA B339
- Revised requirements for hydrostatic pressure tests at time of manufacture
- Revision to the new design criteria
- New welding requirements for specification TC-4EM cylinders
- Revised requirements for ultrasonically inspecting the starting stock of specification TC-3ALM cylinders
- New provisions for requalifying seamless cylinders and tubes by ultrasonic testing instead of a pressure test
- New provisions for the requalification of series-4 containers in noncorrosive gas service
- Clarified requirements for repairing and rebuilding cylinders
- New and revised provisions for applying requalification marks using a metal plate
- New requirements for maintaining requalification records
CSA B340
- Revised requirements for cylinders and tubes mounted on vehicles and trailers
- New requirements for cylinders and tubes longer than 2 m
- Revised filling requirements for carbon dioxide
- New provisions for filling specification TC-4LM containers with methane, refrigerated liquid and natural gas, refrigerated liquid with high methane content
- Revised provisions for vacuum-insulated closed containers for helium refrigerated liquid
CSA B341
- Alignment with the 20th, 21st and 22nd editions of the UN Model Regulations:
- New reference to International Organization for Standardization (ISO) 10462:2013 "Gas cylinders — Acetylene cylinders — Periodic inspection and maintenance"
- New reference to ISO 10961:2019 "Gas Cylinders — Cylinder bundles — Design, manufacture, testing and inspection"
- New reference to ISO 11119-4:2016 "Gas cylinders — Refillable composite gas cylinders — Design, construction and testing — Part 4: Fully wrapped fibre reinforced composite gas cylinders up to 150 l with load-sharing welded metallic liners"
- New reference to ISO 16148:2016 "Gas cylinders — Refillable seamless steel gas cylinders and tubes – Acoustic emission examination (AT) and follow-up ultrasonic examination (UT) for periodic inspection and testing"
- New reference to ISO 18119:2018:2021 "Gas cylinders — Seamless steel and seamless aluminum-alloy gas cylinders and tubes – Periodic inspection and testing"
- New reference to ISO 20475:2018 "Gas cylinders — Cylinder bundles — Periodic inspection and testing"
- New reference to ISO 21172-1:2015:2018 "Gas cylinders — Welded steel pressure drums up to 3 000 litres capacity for the transport of gases — Design and construction — Part 1: Capacities up to 1 000 litres"
- New reference to ISO 22434:2006 "Transportable gas cylinders — Inspection and maintenance of cylinder valves"
- New reference to ISO 23088: 2020 "Gas cylinders – Periodic inspection and testing of welded steel pressure drums — Capacities up to 1 000 l"
- New provisions for UN pressure drums
- Revised shell requirements for UN cylinders for acetylene service
- New provisions for periodically inspecting and testing seamless pressure receptacles by acoustic emission examination and follow-up ultrasonic examination
- Revised requirements for the periodic inspection and test of composite UN cylinders and composite UN tubes
- New requirements for inspecting the neck mounting surfaces for UN refillable seamless steel tubes
- New requirements for design review agencies
CSA B342
- Alignment with the 20th, 21st and 22nd editions of the UN Model Regulations:
- New reference to ISO 10156:2017 "Gas cylinders — Gases and gas mixtures — Determination of fire potential and oxidizing ability for the selection of cylinder valve outlets"
- New reference to ISO 11119-4:2016 "Gas cylinders — Refillable composite gas cylinders — Design, construction and testing — Part 4: Fully wrapped fibre reinforced composite gas cylinders up to 150 l with load-sharing welded metallic liners"
- New reference to ISO 14246:2014/A1:2017 "Gas cylinders — Cylinder valves — Manufacturing tests and examinations"
- New reference to ISO 17879:2017 "Gas cylinders — Self-closing cylinder valves — Specification and type testing"
- New provisions for UN pressure drums
- Updated valve protection requirements
- New requirements for mixtures of fluorine
- Updated fire test requirements for pressure-relief device system
- Revised requirements for cylinders and tubes mounted on vehicles and trailers
- New requirements for cylinders and tubes longer than 2 m
Accessing the new standards
Stakeholders may purchase these standards directly from the CSA Group by telephone at 1-800-463-6727 or online through the CSA website. The CSA Group also has an online platform that allows registered users free access to the new editions of CSA B339, CSA B340, CSA B341, and CSA B342 and to other safety standards related to the transportation of dangerous goods published by CSA Group referenced in Transport Canada’s Transportation of Dangerous Goods Regulations. Users can log into Communities of Interest and register to find the TDG View Access site.
Participating in the development of future editions of this standard
Stakeholders wishing to participate in the development of future editions of these standards are welcome to join CSA's Technical Committee on Cylinders, Spheres, and Tubes for the Transportation of Dangerous Goods. Please contact CSA Group for more information:
Ron Meyers
Project Manager, Worker and Public Safety
CSA Group
178 Rexdale Blvd.
Toronto, ON, M9W 1R3
Telephone: 416-747-2496
E-mail: ron.meyers@csagroup.org
Website: www.csagroup.org
Contact us
Stakeholders may submit questions to Transport Canada’s Transportation of Dangerous Goods Program regarding the new editions of CSA B339, CSA B340, CSA B341, and CSA B342 by sending an email to tdgcontainers-tmdcontenants@tc.gc.ca.