API RP 934-C-2008 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).
ASME SA-335, Standard Specification for Seamless Ferritic Alloy-Steel Pipe for High-Temperature Service ASME SA-336, Standard Specification for Alloy Steel Forgings for Pressure and High-Temperature Parts ASME SA-369, Carbon and Ferritic Alloy Steel Forged and Bored Pipe for High-Temperature Service ASME SA-387, Standard Specification for Pressure Vessel Plates, Alloy Steel, Chromium-Molybdenum ASME 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 for Special Applications ASNT 2 RP SNT-TC-1A, Personnel Qualification and Certification in Nondestructive Testing ASTM 3 G-146, Standard Practice for Evaluation of Disbonding of Bimetallic Stainless Alloy/Steel Plate for Use in High-Pressure, High-Temperature Refinery Hydrogen Service AWS 4 A4.2, Standard Procedures for Calibrating Magnetic Instruments to Measure the Delta Ferrite Content of Austenitic and Duplex Austenitic-Ferritic Stainless Steel Weld Metal AWS A4.3, Standard Methods for Determination of the Diffusible Hydrogen Content of Martensitic, Bainitic, and Ferritic Steel Weld Metal Produced by Arc Welding WRC 5 Bulletin 342, Stainless Steel Weld Metal: Prediction of Ferrite Content 3 Terms, Definitions, and Acronyms 3.1 Terms and Definitions For the purposes of this recommended practice, the following terms and definitions apply. 3.1.1 ASME Code ASME Boiler and Pressure Vessel Code, Section VIII, Division 1 and Division 2, including applicable addenda and Code Cases. 3.1.2 final PWHT The last postweld heat treatment after fabrication of the vessel and prior to placing the vessel in service.
3.1.5 maximum PWHT Specified heat treatment of test specimens used to simulate all fabrication heat treatments including austenitizing, tempering, the final PWHT, a PWHT cycle for possible shop repairs, and a minimum of one extra PWHT for future use by the owner. NOTE To determine the equivalent time at one temperature (within the PWHT range), the Larson-Miller parameter may be used; results to be agreed upon by purchaser and manufacturer. 3.1.6 minimum PWHT Specified heat treatment of test specimens used to simulate the minimum heat treatments (austenitizing, tempering and one PWHT cycle). NOTE To determine the equivalent time at one temperature (within the PWHT range), the Larson-Miller parameter formula may be used; results to be agreed upon by purchaser and manufacturer. 3.2 Acronyms For the purposes of this recommended practice, the following acronyms apply. CMTR certified material test report DHT dehydrogenation heat treatment FN ferrite number HAZ heat-affected zone HBW Brinell hardness with tungsten carbide indenter HV Vickers hardness ISR intermediate stress relief MDMT minimum design metal temperature MT magnetic particle testing
4 Design 4.1 Design and manufacture should conform to the ASME BPVC, Section VIII, Division 1 or Division 2, as applicable. The latest edition including addenda effective through the date of the purchase agreement should be used. 4.2 Design issues are typically covered by a manufacturer’s design report that shows compliance of the design with the user’s design document, ASME Code strength calculations, drawings, and local stress analysis for extra loads, and special design requirements, if required. 4.3 This recommended practice is not intended to cover design issues other than those listed as follows. a) The minimum design thickness should not take any credit for the corrosion allowance and/or weld overlay or clad thickness. b) Weld seam layouts should provide that all welds are accessible for fabrication and in-service NDE such as RT, UT, MT, and PT. c) Nozzle necks should have transition to the vessel body as shown in the ASME BPVC, Section VIII, Division 2, Table 4.2.13. With the purchaser’s approval, nozzles with nominal size 4 in. (100 mm) and less may be fabricated in accordance with the ASME BPVC, Section VIII, Division 2, Table 4.2.10, Detail 3 through Detail 7, with integral reinforcement. 5 Base Metal Requirements 5.1 Material Specification 5.1.1 Base metals should be in accordance with the applicable ASME specifications indicated in Table 1.