Mss Sp-55 Standard Pdf May 2026

: Twelve types of irregularities are categorized, with five examples for each—two showing acceptable levels and three showing rejectable ones. Categories of Surface Irregularities

– Sand trapped in the molten metal showing on the surface. mss sp-55 standard pdf

: Electronic (PDF) versions found on sites like Scribd or Peninsula Alloy are often marked for reference only . For code-compliant inspections, the printed version from MSS is typically required because screen resolutions can distort the reference photographs. Recent Updates (2025 Edition) : Twelve types of irregularities are categorized, with

– Blemishes from the cleaning or riser removal process. For code-compliant inspections, the printed version from MSS

First adopted in 1961, MSS SP-55 was developed by the Manufacturers Standardization Society (MSS) to supplement ASTM casting specifications. It bridges the gap between general casting requirements and the specific visual quality needed for pressure-containing parts in industries such as oil and gas, power generation, and chemical processing.