Recent investigations conducted by the U.S. Department of Transportation, Federal Motor Carrier Safety Administration (FMCSA) on USDOT specification cargo tank testing and repair facilities have resulted in a consistent pattern of non-compliance regarding bench testing of Pressure Relief Devices (PRD). Specifically, cargo tank testing and repair facilities are either failing to bench test PRDs or failing to test them appropriately by not determining the proper start-to-discharge and closing pressures.