Canada hydrostatic testing

In Canada, CAN/CSA B339 and CSA B620-1987, Highway Tanks and Portable Tanks for the Transportation of Dangerous Goods, should be consulted [3, 19]. In the United States, 49 CFR Part 173 outlines procedures for applying for approval of hydrostatic test equipment. More detailed information is available in CGA C-1, Methods for Hydrostatic Testing of Compressed Gas Cylinders [1,20]. 

C4 Methods for Hydrostatic Testing of Compressed Gas Cylinders. U.S. DOT and Transport Canada regulations require certain cylinders to be periodically retested to requalify them for continued service. This standard contains operating and equipment requirements to properly perform these tests (29 pages). 

C-I8 Methods for Acoustic Emission Requalification of Seamless Steel Compressed Gas Tubes. Prepared to identify and describe the various acceptable Acoustic Emission Test (AET) methods that can be utililized in lieu of hydrostatic test in the water jacket to retest certain tubes as mandated by 49 CFR, 173,34 and/or Transport Canada regulations. Includes two acceptable methods of AET. Test procedures, use of special equipment and instrumentation specifications are included (22 pages). 

The direct expansion method is applicable to all hydrostatic tests when volumetric expansion determinations are required. However, it has practical limitations in its use. Although the elastic expansion is also measured in this method, regulations of both the United States and Canada forbid this... 

Under present regulations, cylinders of all types authorized for service with neon, krypton, and xenon must be requalified by hydrostatic test every five years with the following exceptions DOT-3A and 3AA used exclusively for krypton, neon, and xenon may be retested every ten years instead of every five years under special requirements as given in Title 49 of the U.S. Code of Fed-eral Regulations, 49 CFR 173.34(e)(15), or equivalent Transport Canada regulations. [5] and [6] DOT-4 may be retested every ten years and DOT-3C, 3E, and 4C require no periodic retest. 

Acoustic emission testing using hydrostatic or pneumatic pressure is presently allowed only by DOT Exemption (in Canada by Permit of Equivalent Safety ). Because these are special situations, it will be addressed only by definition. Acoustic emission is defined as the transient elastic waves generated by the rapid release of energy within a material. Acoustic emission uses piezoelectric sensors to listen to abnormal sounds generated when a flaw grows under pressure. The sound is analyzed, processed, displayed, and saved. Criteria are estab-... 

---