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SP0178-2007 Appendix C (Continued)$1) NACE Weld Preparation Design Type of Ging Butt Weld Fillet Welded Tee Joint Lap Weld D Ground smooth and blended.° Minor imperfections such as porosity and undercutting exist. Weld spatter is removed; welds ere then ground smooth and blended into the plate surfaces. Minor imperfections such as porosity and undercutting exist. Weld spatter is removed; welds ere then ground smooth and blended into the plate surfaces. Minor imperfections such as porosity and undercutting exist. Weld spatter is removed; welds are then Bound smooth and blended into the plate surfaces. ----lir--- ilk Inside of Tank j or Vessel , E Minimal Sharp projections on the weld bead, slag, and weld spatter ere removed. Sharp projections on the weld bead, slag, and weld spatter are removed. Sharp projections on the weld bead, slag, and weld spatter ere removed. Inside of Tank or Vessel Weld Condition Prior to Finishing Inside of Tank • `._ ''"" or Vessel "' The written descriptions of the various degrees of surface preparation of welds in the appendix of this standard take precedence over the graphics and the companion visual comparator. The graphics are only pictorial representations of the welds and grinding finishes and are not intended to be representative of the integrity of the welds. The "as is original weld is not a typical weld; it is only intended to illustrate defects in welds that must be corrected prier to coating and lining. Good welding practices and welding codes govern the integrity of the weld; this standard only addresses surface preparation of thewelds for the purpose of coating and lining for immersion service. ° Abrasive blasting in preparation for coating may reveal additional porosity and undercutting. Some applicators request the fabrication to blastthe welds to reveal these imperfections prior to requesting inspection of the grinding by the lining applicator. Responsibility for repair of imperfections so revealed should be resolved in the pre -job conference. The visual comparator mentioned in Appendix C is a molded plastic replica that illustrates various degrees of surface finishing for welds prior to coating or lining. Full -seam welds, skip welds, butt welds, lap welds, and others are depicted. For more information, contact the NACE International FirstService Department, 1440 South Creek Dr., Houston, Texas 77084-4906 (telephone +1 2811228-6200). NACE International 13 Shawn Mulhern - Invoice INV-92234-9NXH7T. downloaded on 4/23/2008 1 1: 1 1.30 AM - Single -user license only, copying and networking prohibited.