5.3 ERMUSR 09-11-2018 - Laserfiche WebLink

Home Browse Search

SP0178-2007 Section 1: General 1.1 This standard presents standard practices for the pictorial representations of welds and grinding finishes design, fabrication, and surface finish of tanks and vessels and are not intended to be representative of the to be lined for immersion service. Tanks and vessels may integrity of the welds. The "weld condition prior to be lined for corrosion control or to prevent product finishing" is not a typical weld; it is only intended to contamination. illustrate defects in welds that must be corrected prior to lining. 1.1.1 Appendix A (mandatory) contains illustrations depicting both good and bad practices for tanks and 1.2 Good welding practices and welding codes govern the vessels to be lined for immersion service. integrity of the tank and vessel welds; this standard only addresses surface preparation of the welds for the purpose 1.1.2 Appendix B (nonmandatory) contains a list of of lining the tank or vessel for immersion service. recommended responsibilities of the purchaser (user), designer, fabricator, lining applicator, and inspector to 1.3 Other design and construction codes or standards may ensure that an acceptable lining application is be used to complement the details given here. When achieved. applicable, the requirements of such other codes or standards shall be considered. A partial list of such codes 1.1.3 Appendix C (nonmandatory) contains written and standards can be found in the Bibliography. and graphic descriptions of five degrees of surface preparation of welds in tanks and vessels that may be 1.4 These standard practices may be used in the design, specified prior to lining. The written descriptions of the fabrication, and surface finish of tanks and vessels for five degrees of surface preparation of welds in services other than immersion, such as dry bulk storage of Appendix C take precedence over the graphics and the solid materials. companion visual comparator. The graphics are only Section 2: Definitions Lining: A coating or layer of sheet material adhered to or in flame-sprayed linings, fiber-reinforced plastic linings, or intimate contact with the interior surface of a container used similar lining materials. to protect the container against corrosion by its contents and/or to protect the contents of the container from Surface Finish: The degree of smoothness of a surface contamination by the container material. For the purposes produced by the removal of sharp edges and the of this standard, lining refers to a surface barrier, usually a appropriate surface preparation of welds and other rough thin film less than 500 pm (20 mil)thick applied as either a areas. The term surface finish is also used to characterize lining or a coating. In common usage, the terms coating the degree of smoothness that is necessary to attain a and lining are interchangeable,but in this standard,only the surface to which the lining can be applied satisfactorily in term lining is used.The requirements contained herein may accordance with the lining specification. or may not apply to heavier, thick-film linings, sheet linings, trowel-applied and pumped-into-place finishes, plasma, Section 3: Design Practices 3.1 Accessibility tanks or vessels designed to be buried below grade. 3.1.1 All surfaces of the tank or vessel interior shall be readily accessible for surface preparation and lining 3.1.3 Additional manways and openings should be application(see Figures Al through Al 0,Appendix A). provided as needed to facilitate ventilation. These must meet safety requirements. 3.1.2 The manway diameter for working entrance and safety reasons during the lining application shall be as 3.2 Joints large as practical for the tank or vessel being lined. 3.2.1 Continuous butt-welded joints shall be used 3.1.2.1 If possible, at least one manway shall be whenever possible(see Figure A5,Appendix A). located near ground (working) level, except in NACE International 1 184