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API RP 934 - Materials and Fabrication of Heavy Wall Pressure Vessels for High-Pressure Hydrogen Ser

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API RP 934, Materials and Fabrication of 2 1/4Cr-1Mo, 2 1/4Cr-1Mo-1/4V, 3Cr-1Mo, and 3Cr-1Mo-1/4V Steel Heavy Wall Pressure Vessels for High-temperature, High-pressure Hydrogen Service, is a recommended practice developed and published by the American Petroleum Institute (API). It covers the material and fabrication requirements for heavy wall pressure vessels used in petrochemical plants and refineries to process hydrogen-containing fluids at high temperatures. Specifically those vessels constructed to the standards put forth by the ASME Boiler and Pressure Vessel Code, Section VIII.

API RP 934 is composed of five separate sections: API RP 934 A, C, and E and API TR 934 B and D. Each section covers vessels that are made of different steels or that run in different temperature ranges. These RPs and TPs can be applied when either constructing new vessels or modifying already existing pressure vessels. Along with materials and fabrication, these documents also discuss things like damage mechanisms, proper wall thickness, and weld overlays.

Section A was originally published in December 2000, and the most recent 3rd Edition was released in January of 2019. The current edition of Section C (2nd Ed.) was published in February of 2019, Section E (2nd Ed.) in January 2018, and Sections B and D are both in their 1st Edition from 2011 and 2010. 

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