The MSS SP-55 standard, titled "Quality Standard for Steel Castings for Valves, Flanges, Fittings, and Other Piping Components - Visual Method for Evaluation of Surface Irregularities," was developed to eliminate ambiguity during inspections.
Internal or surface cavities caused by metal contraction. Sand Inclusions: Sand or dross trapped on the surface. mss sp 55 pdf
Elias held his breath. He clicked the link. A .pdf file began to download. It was slow—agonizingly slow. The progress bar crawled across the screen. The MSS SP-55 standard, titled "Quality Standard for
Here's an overview of the standard: