The Department of Transportation changed Special Permit 14157 in July of 2011.

SP 14157 covers all Worthington X-Series, 3442 psi steel scuba cylinders. Changes to SP 14157 include how the cylinder is evaluated for pass/fail at the time of the requalification hydro test. These cylinders are no longer evaluated by the percentage of Permanent Expansion (% PE). These cylinders are now evaluated for pass/fail by the EE (Elastic Expansion) as compared to the REE (Rejection Elastic Expansion). The EE can not exceed the REE. The REE info is stamped into the shoulder of every X-Series Worthington cylinder and can be found by clicking the blue box on the right.

A similar change was also made to Transport Canada's TC-SU 4957 Equivalency Certificate.

Please note that these changes do not have any effect on Worthington LP Series DOT 3AA steel cylinders or Worthington aluminum 3AL aluminum cylinders.

Worthington continues to recommend that the Hydrostatic Requalification Procedures released in June 2010 are followed. You can download a copy by clicking the red box on the right.

Special Permits Downloads