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SP0178-2007 Appendix C—Written and Graphic Descriptions of Various Degrees of Surface Finishing of Welds That May Be Specified in Preparation for lining of Tanks and Vessels (A) NACE Weld • Preparation Designation Type of Grinding Butt Wield Fillet Welded Tee Joid. Lap Weld Ground flush and smooth; free of all defects 'Weld spatter is removed and all surface imperfections are repaired as necessary. The weld is ground flush with the plate surface. Not Applicable Not Applicable Not Applicable Not Applicable 9 Ground flush Minor imperfections such as porosity and undercutting exist. The weld is ground flush with the plate surface. Not Applicable pp Not Applicable pp Not Applicable Not Applicable C Ground smooth; free of all defects.' B` Weld spatter is removed and all suface imperfections are repaired as necessary. The weld is ground smooth and blended into the plate surfaces. VVeld spatter is removed and all surface imperfections are repaired as necessary. The weld is ground smooth and blended into the plate surfaces. Fillet weld between the two plates. Weld spatter is removed and all surface imperfections The lp repaired are necessary: isound smooth and blended into the plate surfaces. Inside of Tank or Vessel - - - ^' The written descriptions of the various degrees of surface preparation of welds in the appendices of this standard take precedence over the graphics and the companion visual comparator. The graphics are only pictorial representations of welds and grinding finishes and are not intended to be representative of the integrity of the welds. The "weld condition prior to finishing" is not a typical weld; it is only intended to illustrate defects in welds that must be corrected prior to lining. Good welding practices and welding codes govern the integrity of the tank and vessel welds; this standard only addresses surface preparation of the welds for the purpose of lining the tank or vessel for immersion service. 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 +1 281/228-6200). 12 NACE International Shawn Murhern - Invoice INV-92234-9NXH7T, downloaded on 4/23/2008 11:11:30 AM - Single -user license only. copying and networking prohibited.