Mss Sp-55 Standard Pdf [VERIFIED]

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.

– Small holes or voids from trapped gas.

– Slightly raised sand-crusted metal blemishes. mss sp-55 standard pdf

– Voids caused by metal contracting during solidification.

– Ridges on the surface from mold sand cracking. First adopted in 1961, MSS SP-55 was developed

– Improper surface prep after a weld repair.

– Linear fractures; generally never acceptable. First adopted in 1961

– Blemishes from the cleaning or riser removal process.