API RP 934 pdf download Materials and Fabrication of 1 1 / 4 Cr- 1 / 2 Mo Steel Heavy Wall Pressure Vessels for High-pressure Hydrogen Service Operating at or Below 825 °F (441 °C)
This recommended practice presents materials and fabrication requirements for new 1 1/4Cr-1/2Mo steel heavy wallpressure vessels and heat exchangers for high-temperature, high-pressure hydrogen service. It applies to vesselsthat are designed, fabricated, certified, and documented in accordance with ASME BPVC, Section viIl, Division 1 orDivision 2.This document may also be used as a resource for equipment fabricated of 1Cr-1/2Mo 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 stainlesssteel weld overlay or cladding to provide additional corrosion resistance.
For this recommended practice, the heavy wall is defined as shell thickness 2 in.(50 mm) or greater but less or equalto 4 in.(100 mm). Integrally reinforced nozzles,flanges, tubesheets, bolted channel covers, etc. can be greater than4 in. (100 mm). At shell or head thicknesses greater than 4 in.(100 mm),1 1/4Cr-1/2Mo has been shown to havedifficulty meeting the toughness requirements given in this document. Although outside of the scope of this document,it can be used as a resource for vessels down to 1 in.(25 mm) shell thickness with changes defined by the purchaser.
This recommended practice is not intended for use for equipment operating above 825 °F (441°C) or in the creeprange.
The following referenced documents are cited in the application of this document. For dated references,only theedition cited applies. For undated references,the latest edition of the referenced document (including anyamendments) applies.
API RP 582,Welding Guidelines for the Chemical,Oil, and Gas Industries
API RP 934-A,Materials and Fabrication of 2 1/4Cr-1Mo, 2 1/4Cr-1Mo-1/4V, 3Cr-1Mo, and 3Cr-1Mo-1/4V Steel HeavyWall Pressure Vessels for High-temperature,High-pressure Hydrogen Service
APITR 938-A, An Experimental Study of Causes and Repair of Cracking of 11/4Cr-1/2Mo Steel Equipment
ASME1 Boiler and Pressure Vessel Code,Section ll—Materials;Part A—Ferrous Material Specifications; Part C,Specification for Welding Rods, Electrodes and Filler Metals; Part D—Properties
ASME Boiler and Pressure Vessel Code, Section V—Nondestructive Examination
ASME Boiler and Pressure Vessel Code,Section VIII—Rules for Construction of Pressure Vessels, Division 1
ASME Boiler and Pressure Vessel Code,Section VIl—Rules for Construction of Pressure Vessels, Division 2—Alternative Rules
ASME Boiler and Pressure Vessel Code, Section lX—Welding and Brazing QualificationsASME SA-20,Specification for General Requirements for Steel Plates for Pressure Vessels
ASME SA-182,Specification for Forged or Rolled Alloy-Steel Pipe Flanges, Forged Fittings, and Valves and Parts forHigh-Temperature Service
ASME SA-263, Standard Specification for Corrosion-Resisting Chromium Steel-Clad Plate, Sheet, and StripASME SA-264,Standard Specification for Stainless Chromium-Nickel Steel-Clad, Sheet and Strip
ASME SA-335, Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature ServiceASME SA-336, Standard Specification for Alloy Steel Forgings for Pressure and High-Temperature PartsASME SA-369,Carbon and Ferritic Alloy Steel Forged and Bored Pipe for High-Temperature ServiceASME SA-387, Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-MolybdenumASME SA-435,Standard Specification for Straight-Beam Ultrasonic Examination of Steel Plates
ASME SA-578,Standard Specification for Straight-Beam Ultrasonic Examination of Plain and Clad Steel Plates forSpecial Applications
ASNT2 RP SNT-TC-1A, Personnel Qualification and Certification in Nondestructive Testing
ASTM3 G-146, Standard Practice for Evaluation of Disbonding of Bimetallic Stainless Alloy/Steel Plate for Use inHigh-Pressure,High-Temperature Refinery Hydrogen Service
AWS4 A4.2，Standard Procedures for Calibrating Magnetic Instruments to Measure the Delta Ferite Content ofAustenitic and Duplex Austenitic-Ferritic Stainless Steel Weld Metal
AWS A4.3，Standard Methods for Determination of the Diffusible Hydrogen Content of Martensitic，Bainitic,andFerritic Steel Weld Metal Produced by Arc Welding
wRC5 Bulletin 342,Stainless Steel Weld Metal: Prediction of Ferrite Content3 Terms, Definitions, and Acronyms
3.1Terms and Definitions
For the purposes of this recommended practice, the following terms and definitions apply.3.1.1
ASME Boiler and Pressure Vessel Code,Section VII, Division 1 and Division 2, including applicable addenda andCode Cases.
The last postweld heat treatment after fabrication of the vessel and prior to placing the vessel in service.