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API RP 934-C-2008 pdf free download

API RP 934-C-2008 pdf free 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).
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.
5.4 Heat Treatment All product forms should be normalized and tempered (N&T) or quenched and tempered (Q&T) to meet the required mechanical properties. For equal to or greater than 2 in. (50 mm) thickness, Q&T is typically required to meet the properties specified in this recommended practice. 5.5 Mechanical Properties 5.5.1 Location of Test Specimens Test specimens for establishing the tensile and impact properties should be removed from the following locations: a) Plate—from each plate transverse to the rolling direction in accordance with ASME SA-20 at the standard test locations and at the 1 / 2 T location. When permitted by the applicable product specification, coupons for all tests should be obtained from the 1 / 2 T location only. If required, 1 / 2 T specimens should be used for hot tensile test. b) Forging—from each heat transverse to the major working direction in accordance with ASME SA-182 or ASME SA-336, and test specimens should be taken at 1 / 2 T of the prolongation or of a separate test block. A separate test block, if used, should be made from the same heat and should receive substantially the same reduction and type of hot working as the production forgings that it represents and should be of the same nominal thickness as the production forgings. The separate test forging should be heat treated in the same furnace charge and under the same conditions as the production forgings.
5.5.2 Tensile Test Requirements Tensile testing of plates and forging materials should comply with the applicable code(s) and the following additional requirements: a) test coupon should be heat treated to represent the maximum postweld heat treatment per 3.1.6; b) tensile properties at room temperature should meet the requirements of the applicable code(s). 5.5.3 Impact Testing Requirements Charpy V-notch (CVN) impact testing should be performed for all 1 1 / 4 Cr- 1 / 2 Mo steel material used for pressure containing components except bolting. CVN impact tests should comply with the applicable code(s) and the following additional requirements. a) Test coupons from forgings should be oriented transverse to the major direction of metal flow. b) Test coupons heat treated to represent both the minimum and maximum post weld heat treatments that the equipment are expected to receive during fabrication per 3.1.5 and 3.1.6 should be tested and meet the following requirements. The minimum CVN impact values at 0 °F (–18 °C) should be 40 ft-lbs (54 Joules) average of three specimens and 20 ft-lbs (27 Joules) minimum for a single specimen. In addition, if the MDMT is < 0 °F (–18 °C), code requirements for impact testing must also be met. If the impact test at this MDMT of < 0 °F ( < –18 °C) meet the 40/20 ft-lbs (54/27 Joules) criteria, retesting at 0 °F (–18 °C) is not needed. c) Percentage shear fracture should meet 25 % minimum. Lateral expansion should also be reported for information. 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, should match the nominal chemical composition of the base metal to be welded.

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