In this standard, the term, tank, refers to pressure vessels, vacuum vessels, and open tanks. A tank is generally considered to extend to the first circumferential weld or up to, and including, the first flanged connection with an outside pipe. Pipe branches, tubes, and other piping forming part of the tank shall be designed, manufactured, and inspected according to the Swedish Piping Code. For piping of this kind, the present standard applies only for welding of joints.
This standard is referred to in the Ordinance concerning Pressure Vessels etc issued by the National Board of Occupational Safety and Health, which also specifies for what kinds of tank the standard is applicable.