API TR 934-H pdf download Inspection, Assessment, and Repair of Heavy Wall Reactor Vessels in High- temperature High-pressure Hydrogen Service Scope This TR documents guidance for the inspection, assessment, and repair of heavy wall reactor vessels (nominallyconsidered a wall thickness of 50 mm (2 in.) and greater) in high-pressure hydrogen service operating attemperatures below 455°C(850 °F). t provides industry practices...