Mss Sp 55 Pdf < VALIDATED - TIPS >

MSS SP-55 stands for the Manufacturers Standardization Society (MSS) Standard Practice SP-55: "Quality Standard for Steel Castings for Valves, Flanges, and Fittings."

In short, this is the industry’s "visual inspection bible." It provides a definitive set of reference photographs for the surface finish of steel castings. It tells you: "Is this defect acceptable, or does this part need to be scrapped or repaired?"

The standard doesn't just show you a defect; it shows you three degrees of severity. 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.

To comply with SP-55, the following conditions must be met: The standard doesn't just show you a defect;

According to the official MSS SP 55 PDF, the standard covers:

It does NOT cover:

Expect to pay between $150 and $250 USD for the official PDF. While not cheap, this cost is negligible compared to a single product liability lawsuit.