The prescribes a specific visual inspection procedure:
MSS SP-55 is the industry-standard visual method for evaluating surface irregularities in steel castings for valves, flanges, and fittings, utilizing 60 reference photographs to identify defects. Adopted to ensure uniformity, the standard classifies 12 types of surface discontinuities, ranging from cracks and shrinkage to porosity and surface texture. For detailed information and access to the standard, visit Manufacturers Standardization Society . MSS SP-55-2001 - Peninsula Alloy Inc. mss sp 55 pdf
This tiered system is the most helpful feature for inspectors. Instead of guessing, you hold your part up to the PDF image (or printed version) and determine if your defect looks more like the "Acceptable" photo or the "Unacceptable" photo. The prescribes a specific visual inspection procedure: MSS
Explain how to for inspection. Help you find where to purchase the current 2021 edition . MSS SP-55-2001 - Peninsula Alloy Inc
Many engineering specifications will state: "All steel castings shall meet MSS SP 55, latest revision." This is a default requirement in industries like oil & gas, petrochemical, and power generation.