– Non-metallic materials (like sand or slag) trapped in the casting. Type IV: Gas Porosity – Small voids or bubbles caused by trapped gas. Type V: Chaplets

It covers common defects such as porosity, shrinkage, cracks, and laps/cold shuts. 3. Inspection Method

Visual inspection is faster and cheaper than other NDT methods, making it ideal for preliminary or routine surface quality checks.

: Pits or trapped material on the surface. Shrinkage (Rechupe) : Voids caused by metal cooling.

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– Grooves or gouges left behind when removing risers, gates, or feeding pads.

Inspect 100% of the component surface under minimum light requirements. Categorization

While ASTM A802 offers similar visual inspection guidelines, is specifically tailored for the valve and fitting industry, adhering to the strict technical codes established by the MSS. Accessing the MSS SP-55 Standard PDF