1.1 This Recommended Practice provides guidelines for the design, fabrication, and surface finish of tanks that are to be lined for corrosion resistance or to prevent product contamination in chemical immersion service. Suggestions are given in Appendix B for the responsibilities of the purchaser (user), fabricator, and lining applicator regarding design specifications and inspections. 
1.2 The recommended practices in this Standard can also be used in the design, fabrication, and surface finish of tanks or vessels for services other than immersion, such as dry bulk storage of solid materials.
1.3 Definitions
1.3.1 Linings: Linings are herein defined as surface barriers, applied as a lining or a coating. In common usage, the terms "coatings" and "linings" are used interchangeably, but in this document, only the term “linings" will be used.
1.3.2 Surface Finish: Surface finish is herein defined, as the degree of smoothness of the surface which may, require grinding of sharp edges, welds, and other rough areas to obtain a smooth surface to which linings can be applied.

Historical Document 1973