SUMMARY: This is to notify the public that we (``RSPA'') have obtained information concerning high-pressure compressed gas cylinders that appear to have been requalified improperly by Sooner Cylinder Service, Inc. (``Sooner''), 1032 SE 25th Street, Oklahoma City, OK 73129. Based on our review of Sooner's records, Sooner has marked, certified and returned to service an undetermined number of high-pressure DOT specification and exemption cylinders as having been being properly tested in accordance with the Hazardous Materials Regulations (HMR), when it appears that the cylinders were hydrostatically retested using equipment that was not verified to be accurate as required. In addition, it appears that some cylinders were marked, certified, and returned to service when they may have been required to be removed from service and condemned.

A hydrostatic retest and visual inspection, conducted as prescribed in the HMR, are used to verify the structural integrity of a cylinder. If the hydrostatic retest and visual inspection are not performed in accordance with the HMR, a cylinder with compromised structural integrity may be returned to service when it is required to be condemned. Extensive property damage, serious personal injury, or death may result from rupture of a cylinder. Cylinders that have not been retested in accordance with the HMR may not be charged or filled with compressed gas or other hazardous material and offered for transportation in commerce.

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