Pdf | Mss Sp-55 Standard

– Ridges on the surface from mold sand cracking.

The standard classifies defects into to ensure inspectors use consistent terminology:

The edition recently replaced the 2011 version. A major update in this version is the inclusion of iron and ductile iron castings , expanding the standard's scope beyond just steel. It also aims to align surface quality expectations more closely between manufacturers and purchasers in the broader piping industry. MSS SP-55 - Manufacturers Standardization Society mss sp-55 standard pdf

: The standard is intended for use on any 4 in. x 5 in. (100mm x 125mm) area of a casting surface.

– Voids caused by metal contracting during solidification. – Ridges on the surface from mold sand cracking

The standard is most known for its collection of illustrating various surface irregularities. These photos allow inspectors to perform a side-by-side visual comparison with actual castings to determine if a surface condition is acceptable or rejectable. Key Features and Scope

– Small holes or voids from trapped gas. It also aims to align surface quality expectations

– Evidence of incomplete fusion of internal supports.