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SP0178-2007 <br />APPENDIX A: <br />Illustrations of Design, Fabrication, and Surface Finish Practices for Metal Tanks and Vessels to Be <br />Lined for Immersion Service <br />Full Seam Weld Skip Weld <br />DO <br />Inside of <br />Tank or <br />Vessel <br />Round All Sharp Edges <br />per Paragraph 5.1. <br />Skip Weld <br />DON'T <br />Inside of <br />Tank or <br />Vessel <br />2 Channels Back -to -Back <br />DON'T <br />FIGURE Al <br />All construction involving pockets or crevices that do not drain or that cannot be properly abrasive blasted and lined shall be <br />avoided. <br />NACE International 5 <br />