No, the PDF file does not expire, but the standard becomes obsolete when a new revision is issued. Most audits expect the current revision within 5 years of publication.
A cold shut is a line or seam on the surface where two streams of molten metal failed to fuse properly. Acceptance depends on depth and location. In general: mss sp 55 pdf
MSS SP 55 stands for Manufacturers Standardization Society Standard Practice 55. The full title is: "Quality Standard for Steel Castings for Valves, Flanges, Fittings, and Other Piping Components – Visual Method for Evaluation of Surface Irregularities." No, the PDF file does not expire, but
This standard was developed to establish a uniform, visual method for evaluating surface discontinuities in steel castings. It applies specifically to components used in pressure-containing applications, such as valve bodies, bonnets, flanges, and pipe fittings. A cold shut is a line or seam
Unlike dimensional or material composition standards, MSS SP 55 focuses exclusively on surface quality. It provides acceptance criteria for various types of surface irregularities, including cracks, cold shuts, shrinkage, and sand inclusions.
Once you have a legitimate copy: