CPA Public Affairs

Cylinder Marking Maintenance

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Following requalification, each cylinder must be plainly and permanently marked as per the CSA B339-08 (Cylinder, Spheres, and Tubes for the Transportation of Dangerous Goods) Standard.  

Clause states that: "Except as provided in Clause, any marking becoming illegible shall be remarked on the container or reproduced on a metal plate permanently secured to the cylinder or any permanent part of the container, excluding the sidewall."

Clause states that: "Where the space originally provided for marking requalification dates becomes filled, the expired requalification dates, except the last one, may be removed by peening, provided that:
  • Permission to do so has been obtained from the owner of the container,
  • The design minimum wall thickness is maintained, and
  • The original manufacturing test date is not removed.
TDG standards, such as the CSA B339 Standard, can be viewed on the CSA Group website: register or log in and scroll down to "TDG Standards" under "View Access".

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