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 and chemical 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 RPs also discuss things such as damage mechanisms, proper wall thickness, and weld overlays.

The First Edition of Section A was originally published in December 2000, with the most recent edition published in May 2008. The other sections are all in their first edition and were published at various times from 2008 to 2011. Two addendums to Section A were published in February of 2010 and March of 2012.

Related Topics

• API 510 - Pressure Vessel Inspection Code
• API 530 - Calculation of Heater Tube Thickness in Petroleum Refineries
• API 570 - Piping Inspection Code
• API 653 - Tank Inspection, Repair, Alteration, and Reconstruction
• API 936 - Refractory Installation Quality Control - Inspection & Testing Monolithic Refractory
• API Individual Certification Program (ICP)
• API RP 1169 - Pipeline Construction Inspection
• API RP 572 - Inspection of Pressure Vessels
• API RP 573 - Inspection of Fired Boilers and Heaters
• API RP 574 - Inspection Practices for Piping System Components
• API RP 575 - Inspection Practices for Atmospheric and Low Pressure Storage Tanks
• API RP 577 - Welding Processes, Inspection, and Metallurgy
• API RP 578 - Material Verification for New and Existing Alloy Piping
• API RP 583 - Corrosion Under Insulation and Fireproofing
• API RP 584 - Integrity Operating Windows
• API RP 585 - Pressure Equipment Integrity Incident Investigation
• API RP 651 - Cathodic Protection of Aboveground Petroleum Storage Tanks
• API RP 754 - Process Safety Performance Indicators for the Refining and Petrochemical Industries
• API TES - Tank Entry Supervisor

Relevant Links

• Standards
• Purchase Document (A)
• Purchase Document (B)
• Purchase Document (C)
• Purchase Document (D)
• Purchase Document (E)

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