API RP 934:2000 pdf download.Materials and Fabrication Requirements for 2 1 / 4 Cr-1Mo & 3Cr-1Mo Steel Heavy Wall Pressure Vessels for High Temperature, High Pressure Hydrogen ServiceAPI
1 Introduction
This recommended practice applies to new heavy wall pressure vessels in petroleum refining, petrochemical and chemical facilities in which hydrogen or hydrogen-containing fluids are processed at elevated temperature and pressure. It is based on decades of industry operating experience and the results of experimentation and testing conducted by indepen- dent manufacturers, fabricators and users of heavy wall pres- sure vessels for this service. Licensors and owners of process units in which these heavy wall pressure vessels are to be used may modify and/or supplement this recommended practice with additional pro- prietary requirements.
1.1 SCOPE
This recommended practice presents materials and fabrica- tion requirements for new 2– 1 / 4 Cr and 3Cr steel heavy wall pressure vessels for high temperature, high pressure hydrogen service. It applies to vessels that are designed, fabricated, cer- tified and documented in accordance with ASME Code Sec- tion VIII, Division 2, including Appendix 26, Mandatory Rules for Cr-Mo Steels with Additional Requirements for Welding and Heat Treatment and ASME Code Case 2151, as applicable. Materials covered by this recommended practice are conventional steels including standard 2– 1 / 4 Cr–1Mo and standard 3Cr–1Mo steels, and advanced steels including enhanced 2– 1 / 4 Cr–1Mo, 2– 1 / 4 Cr–1Mo– 1 / 4 V, 3Cr–1Mo– 1 / 4 V–Ti–B, and 3Cr–1Mo– 1 / 4 V–Cb–Ca steels. The inte- rior surfaces of these heavy wall pressure vessels may have an austenitic stainless steel weld overlay to provide additional corrosion resistance.
5.5.3.2.3 After the Charpy V-notch test specimen sets are heat treated, each set of specimens shall be impact tested at eight selected test temperatures to establish a transition temperature curve. One of the tests shall be per- formed at –20°F (–29°C). Three specimens shall be tested at each test temperature. The transition temperature curve shall be established from at least two test temperatures on both the upper and lower shelf and a minimum of four intermediate test temperatures.
6.2.2 Impact Properties
Prior to the start of fabrication, each lot of electrodes, heat of filler wire, and combination of lot of flux and heat of wire, shall be screened by impact testing of weld deposit to show resistance to temper embrittlement as follows: a. Conventional steels: Step cooling tests shall be performed as specified for the base metal in 5.5.3.2. The impact proper- ties shall meet the requirements of 5.5.3.2.5. b. Advanced steels: Impact testing shall be performed in accordance with Para. 26-300 of the Code or Code Case 2151, as applicable. Step cooling tests shall be in accordance with 5.5.3.2.
API RP 934:2000 pdf download
PS:Thank you for your support!
