API RP 934-2000 pdf free download

API RP 934-2000 pdf free download.Materials and Fabrication Requirements for 2- 1 / 4 Cr-1Mo & 3Cr-1Mo Steel Heavy Wall Pressure Vessels for High Temperature, High Pressure Hydrogen Service.
3 Definitions 3.1 DEFINITIONS For the purposes of this recommended practice, the follow- ing definitions apply: 3.1.1 advanced steels: Enhanced 2– 1 / 4 Cr–1 Mo, 2– 1 / 4 Cr–1 Mo– 1 / 4 V, 3Cr–1 Mo– 1 / 4 V–Ti–B, and 3 Cr–1 Mo– 1 / 4 V– Cb–Ca steels. 3.1.2 ASME code: ASME Boiler and Pressure Vessel Code , Section VIII, Division 2, including applicable addenda. 3.1.3 conventional steels: Standard 2– 1 / 4 Cr–1 Mo and standard 3 Cr–1 Mo steels 3.1.4 final PWHT: The last post-weld heat treatment after fabrication of the vessel and prior to placing the vessel in ser- vice. 3.1.5 hot forming: Mechanical forming of vessel compo- nents above the final PWHT temperature. 3.1.6 maximum PWHT: Specified heat treatment of test specimens used to simulate all fabrication heat treatments after normalizing and initial tempering, including all interme- diate heat treatments above 900°F (482°C), the final PWHT, and a minimum of one extra PWHT for future use by the owner. 3.1.7 minimum PWHT: Specified heat treatment of test specimens used to simulate all fabrication heat treatments after normalizing and initial tempering, including all interme- diate heat treatments above 900°F (482°C) and the final PWHT. 3.1.8 Step cooling heat treatment: Specified heat treatment used to simulate and accelerate embrittlement of test specimens for the purpose of evaluating the potential for temper embrittlement of alloy steels in high-tempera- ture service. 3.2 ACRONYMS For the purposes of this recommended practice, the follow- ing acronyms apply: CMTR certified material test report DHT dehydrogenation heat treatment FN ferrite number HAZ heat-affected zone HB Brinell hardness HV Vickers hardness ISR intermediate stress relief MDMT minimum design metal temperature MT magnetic particle testing NDE nondestructive examination PT penetrant testing PWHT post-weld heat treatment RT radiographic testing UT ultrasonic testing WPQT welding procedure qualification test 4 Design 4.1 Design and manufacture shall conform to the ASME Boiler and Pressure Vessel Code , Section VIII, Division 2. The latest edition including addenda effective through the date of the purchase agreement shall 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 below.
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. 5.5.3.2.4 The 40 ft-lb (55 J) transition temperatures shall be determined from the transition temperature curves established from the two sets of Charpy V-notch speci- mens. The impact properties shall meet the following requirement: CvTr40 + 2.5 DCvTr40 £ 50°F (10°C), where CvTr40 = 40 ft-lb (55 J) transition temperature of the base metal subjected to the minimum PWHT only. DCvTr40 = the shift of the 40 ft-lb (55 J) transition tem- perature of material subjected to the minimum PWHT plus the step cooling heat treatment. 6 Welding Consumable Requirements 6.1 MATERIAL REQUIREMENTS 6.1.1 The deposited weld metal, from each lot or batch of welding electrodes and each heat of filler wires, and each combination of filler wire and flux, shall match the nominal chemical composition of the base metal to be welded. 6.1.2 The following chemical composition limits shall be controlled to minimize temper embrittlement. X-bar = (10P + 5Sb + 4Sn + As) / 100 £ 15 [P, Sb, Sn, and As in ppm] Cu: 0.20% maximum Ni: 0.30% maximum 6.1.3 Low hydrogen welding consumables, including fluxes, having a maximum of 10 ml of diffusible hydrogen for every 100 grams of weld metal, per AWS A4.3, shall be used. They shall be baked and stored in accordance with manufac- turer’s instructions, i.e., electrode oven, to reduce moisture content and to ensure their low hydrogen nature.