测试

This standard covers materials and fabrication requirements for new 1¼Cr-½Mo steel heavy-wall pressure vessels and heat exchangers for high-temperature, high-pressure hydrogen service. It applies to pressure vessels that are designed, fabricated, certified, and documented in accordance with ASME Section VIII, Division 1 or Division 2. This document may also be used as a resource for equipment fabricated of 1Cr-½Mo steel. This document may also be used as a resource when planning to modify an existing heavy-wall pressure vessel. The interior surfaces of these heavy-wall pressure vessels may have an austenitic stainless steel or ferritic stainless steel weld overlay or cladding to provide additional corrosion resistance. Multilayer pressure vessels are outside the scope of this document. This standard is not intended for use for equipment operating above 825 °F (440 °C) or in the creep range. API Standard 934-E covers these higher-temperature applications.