AWS D18.3-D18.3M:2015 pdf download.Specification for Welding of Tanks, Vessels, and Other Equipment in Sanitary (Hygienic) Applications
1.1 Scope. This specification covers the requirements for welding of stainless steels and nickel alloys (as well as carbon steels and other metals for some applications) in sheet, plate, bar, and other forms for the fabrication and construction of new tanks, vessels, and other equipment in sanitary (hygienic) applications. The welding of pipe or tube to a tank, vessel or other piece of sanitary equipment, for use as a nozzle or other opening, is included in this specification. This specification excludes the welding of tube and pipe for the transportation of sanitary (hygienic) system products and cleaning or sanitizing solutions. Pipe and tube welding for sanitary (hygienic) systems is covered in AWS D18.1,Specification for Welding of Austenitic Stainless Steel Tube and Pipe Systems in Sanitary (Hygienic) Applications.
This specifcation is intended for new construction and may also be applied to maintenance and repair of equipment in sanitary (hygienic) applications. This specification does not address structural. pressure design nor corrosion aspects of components and systems. However requirements in this specification should be applied in conjunction with other govern-ing requirements.
Sanitary processing systems are intended to include those systems handling products for human and animal consumption,or for cleaning and sanitizing solutions used in these systems. Such products include, but are not limited to, dairy, meat,poultry, vegetable, beverage, personal care items (such as shampoo, soap, toothpaste, cosmetics), and other products con-sumed or used by humans and animals. This specification may be used, in whole or in part. for other applications where hygienic fabrication is desired.
1.4 Owner's Responsibility. The Owner or their representatives shall provide a complete specification for the equipment and shall identify surface classification zones (product-contact surface zones and non-product-contact surface zones) and weld finishes for each surface classification zone. Owners should use Figure 1 to specify surface classification zones and Annex B to designate the required weld finish of each zone.
1.5 Welding Symbols. Welding symbols shall be those shown in the latest edition of AWS A2.4, Standard Symbols for Welding, Brazing, and Nondestructive Examination. Special conditions shall be fully explained by added notes or details.
2. Normative References
The standards listed below contain provisions, which, through reference in this text, constitute mandatory provisions of this AWS standard. For undated references, the latest edition of the referenced standard shall apply. For dated references,subsequent amendments to, or revisions of, any of these publications do not apply.AWS D18.3-D18.3M pdf download.