C-20: Requalification Standard for Metallic, DOT and TC 3-Series Gas Cylinders and Tubes Using Ultrasonic Testing

This standard identifies and describes the various acceptable UT methods (also known as ultrasonic examination [UE] methods) that may be used in place of internal visual inspection and hydrostatic requalification methods used to examine certain metallic, U.S. Department of Transportation (DOT)/Transport Canada (TC) 3-series gas cylinders and tubes as mandated by Title 49 of the U.S. Code of Federal Regulations (49 CFR) and TC’s Transportation of Dangerous Goods Regulations, and cylinders manufactured under certain DOT special permits or TC equivalency certificates. This standard also specifies the allowable flaw ac-ceptance/rejection criteria to be used. This standard may also be applied to other seamless steel and aluminum alloy cylinders and tubes when authorized by the regulatory authority.

Aluminum alloy cylinders susceptible to sustained load cracking such as those manufactured from 6351 aluminum alloy shall also have the shoulder and neck area internally visually inspected and an eddy current examination of neck threads completed in accordance with established regulatory requirements.

This standard does not address any safety, health, or environmental considerations associated with UT or regulations and codes. Operating procedures and processes regarding worker safety precautions and requirements shall be met. See additional references in Section 13.
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April 2021
Available To the Public
46 pages
Special Attributes:
Cylinder Specifications