S9074-AQ-GIB-010/248 Rev 1
5-3.2 FUEL GAS WELDING. 5-3.2.1 Base Material Form, Size, and Thickness. Performance qualification tests performed on a given base material form and thickness shall qualify as shown in figures 7-12 and 7-13, as applicable. Qualification position limitations shall be as specified in table 7-9. Test assemblies shall be tested and evaluated as specified in 5-4. 5-3.3 TACK AND FILLET WELDING (EXCLUDING SOCKET JOINTS; SEE TABLE 7-10, FOOTNOTE 12). 5-3.3.1 Base Material Form and Size. Qualification tests shall conform to the requirements of table 7-10, test no. 8. The positions for which a test assembly welded in a given position qualifies are shown in table 7-9. The test assembly shall be tested and evaluated as specified in 5-4. 5-3.3.2 Extent of Qualification. Multiple material performance qualifications may be attained by qualifying as outlined in table 7-8. Fillet joints are also qualified by butt and socket joints per tables 7-9 and 7-10. 5-3.4 WELD SURFACING (BUILD-UP, BUTTERING, HARDFACING, AND CLADDING). Build-up shall be qualified by a butt weld test. Except as permitted by 5-3.4.1, qualification for hardfacing and cladding, including qualified thickness and minimum layers, where applicable, shall be per table 7-10, test no. 9. Qualified positions shall per table 7-9. The test no. 9 assembly shall be tested and evaluated as follows: a. Perform visual, dye penetrant, and macro-etch examination as specified by table 7-11 and 5-4. b. Perform hardness testing per figure 7-17 or figure 7-17A for hardfacing. c. Perform composition testing per figure 7-17 or figure 7-17A for cladding where both figure 7-4, note 5a applies and production weld layers, thickness, or both meet the criteria of figure 7-17A, note 8(a)(ii). 5-3.4.1 Cladding for Applications Where Composition Testing is Not Required, and Buttering. In these instances, qualification shall be by either a butt weld test, or test no. 9, per table 7-10. 5-3.5 SEAL, SOCKET, AND TUBE-TO-TUBESHEET WELDS. 5-3.5.1 Thin Socket Welds, Tube-to-Tubesheet Welds, and Seal Welds Other Than Edge or Thicker Fillet Welds. Seal welds (including fillet seal welds in piping with nominal wall thickness less than 3/16 inch but not including other fillet seal welds or edge seal welds), socket welds in piping with nominal wall thicknesses less than 3/16 inch, and tube-to-tubesheet welds shall require welding, inspecting, and evaluating mock-ups of the production weld in accordance with 4-4.6, except as follows:
a. Qualified positions, materials, and thicknesses shall be in accordance with Chapter 5. b. Tube-to-tubesheet test assemblies shall consist of a minimum of six joints. c. The requirements of 4-4.6.1.a and b do not apply.
d. For the socket weld test, the smallest pipe size (OD and nominal wall thickness) to be welded in production shall be used, except that (1) the diameter allowances of table 7-10, footnote 15 shall apply and (2) 1/2 NPS schedule 10 (or equivalent tube size) shall qualify all diameters and thicknesses of 0.058 inch and greater. This test shall be designated as number 3S. 5-3.5.2 Thicker Socket Welds and Other Seal Welds. Qualification of the following welds shall require completion of a mock-up weld per 5-3.5.1 or the weld test indicated below in accordance with Chapter 5: a. For all diameter socket welds with wall thickness 3/16 inch or greater – pipe butt weld test. b. For all diameter fillet type seal welds in pipe with thickness 3/16 inch or greater – pipe butt or socket weld test. c. For other fillet type seal welds (i.e., not in pipe) and edge seal welds – butt weld test on plate or pipe per table 7-9 or socket weld test.
5-5
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