Api Rp 934 A PDF

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3 Terms, Definitions, and Acronyms . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . 33.1 Terms and Definitions . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . 33.2 Acronyms . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . 4

5 Base Metal Requirements. . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . 55.1 Material Specification . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . 55.2 SteelMaking Practice . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . 55.3 Chemical Composition Limits . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . 55.4 Heat Treatment. . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . 65.5 Mechanical Properties . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . 6

6 Welding Consumable Requirements. . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . 76.1 Material Requirements . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . 76.2 MechanicalRequirements . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . 7

7 Welding, Heat Treatment and Production Testing. . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . 77.1 General Welding Requirements . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . 77.2 Welding Procedure Qualification. .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . 87.3 Preheat andDehydrogenation Heat Treatment . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 87.4Production Testing of Base Metal Welds . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . 97.5 Weld Overlay or Integral Clad . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . 107.6 Final PWHT. . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

8 Nondestructive Examination (NDE). . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . 128.1 General . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . 128.2 NDEPrior to Fabrication. . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . 128.3 NDE During Fabrication . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . 128.4 NDE AfterFabrication and Prior to Final PWHT . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128.5NDE After Final PWHT. . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . 138.6 Positive Material Identification. . . . .. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .. . . . . . . . . . . . . . . . . . . . . . 13

This recommended practice (RP) applies to new pressure vesselsin petroleum refining, petrochemical and chemical facilities inwhich fluids are processed at temperatures in the 825 F to 1100 F(440 C to 595 C) range. It is based on decades of industryoperating experience and the results of recent experimentation andtesting conducted by independent manufacturers, fabricators andusers of pressure vessels for this service.

This recommended practice (RP) includes materials andfabrication requirements for new 11/4Cr-1/2Mo steel and 1Cr-1/2Mopressure vessels and heat exchangers for high temperature service.It applies to vessels that are designed, fabricated, certified, anddocumented in accordance with ASME Code Section VIII, Division1.

This RP is applicable to wall (shell) thicknesses from 1 in. (25mm) to 4 in. (100 mm). Integrally reinforced nozzles, flanges,tubesheets, bolted channel covers, etc. can be greater than 4 in.(100 mm). At shell or head thicknesses greater than 4 in. (100 mm),11/4Cr-1/2Mo and 1Cr-1/2Mo have been shown to have difficultymeeting the toughness requirements given in this document, but thisdoes not preclude the use of this alloy if these properties can bemet or if the equipment is designed with stresses below thethreshold for brittle fracture. Although outside of the scope, thisdocument can be used as a resource for vessels down to 0.5 in.(12.7 mm) shell thickness with changes defined by thepurchaser.

This RP is not intended for use for equipment operating below825 F (440 C). Refer to API 934-C for information on design forequipment operating at lower temperature ranges. Sincehydrotreaters typically are designed to temperatures lower than 825F (440 C), the guidelines in this RP do not apply to mosthydrotreaters. Also, since coke drums typically fail due to fatigueand not due to reheat cracking; these RPs may not be appropriatefor all aspects of coke drums.

The following referenced documents are indispensable for theapplication of this document. For dated references, only theedition cited applies. For undated references, the latest editionof the referenced document (including