S9074-AQ-GIB-010/248 Rev 1
TOP (SEE NOTE 9)
STEEL PLATE AND COAMING OR STEEL PLATE
3"
3"
2"
JOINT A
1
HAND HOLE
QUALIFICATION TEST PLATE DIMENSIONS AS REQUIRED
3-5/16"
1.269" D. (MAX) 1.260" D. (MIN)
3-5/16"
3-1/2"D
JOINT B (SEE NOTE 8)
A
6-1/2" 8-1/2"
PLAN VIEW SUPERHEATER HEADER MOCK-UP
SECTION 1-A
NOTE : Orientation of the assembly shall be as required for the welding position specified in the welding procedure. Orientation shown is for welding in vertical headers (refer to note 9). NOTES: 1. Header mock-up shall be fabricated from steel with top, bottom, and all sides closed, except as necessary for electrical lighting. Either pipe or plate may be used (plate shown) and thickness may be selected as necessary to achieve specified space restrictions, except material thickness shall be 3/16 inch nominal, minimum. Mock-up shall be at least 18 inches wide and 30 inches long with hand holes approximately centered. 2. Header mock-up should be constructed to permit easy removal of test plate for NDT inspection. Test plate shall be rigidly affixed in mock-up so that all welding and grinding is completed in place. 3. Insulation of hot surfaces shall simulate conditions the welder will experience in production. Inside surfaces of mock-up shall not be insulated. 4. Hand hole diameter and all other dimensions do not include insulation. 5. Babcock and Wilcox superheater headers provided by NAVSEA for welder qualification may be considered to meet these space restriction requirements for qualification of welding in the vertical position (that is, the tube in the horizontal-fixed position) only. 6. Except where minimum or maximum dimensions are shown, dimensional tolerances shall be ±1/16 inch. 7. More severe space restrictions than shown may be used if approved. 8. To meet the requirements of 5-3.6 for four joints, either of the following may be performed: (a) Under the conditions shown, the test assembly may be welded in two parts; that is, two joints followed by another two joints; or (b) An additional hand hole and enlarged/additional test plate meeting the same dimensional restrictions may be added as necessary to permit welding of all four joints at once. In any event, the space restrictions and orientation shown shall be met for all joints and two “A” joints and two “B” joints shall be completed. Additionally, for the particular stage of welding (that is, root or final) inspection/testing shall be performed on all four joints at once (that is, welding and inspection of two joints followed by welding and inspecting another two is not permissible). 9. The orientation set by designation of “TOP” is for welding with the header mock -up positioned vertically; that is, the tube is in the horizontal fixed position. Figure 7-25. Mockup and Orientation of Assembly for Performance Qualification for Manual Welding of Tube-to-Header Seal Weld Joints Figure 25. Mockup and Orientation of Assembly for Performance Qualification for Manual Welding of Tube-to-Header Joint Welds.
7-101
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