What is CRA in valves?
CRA stands for Corrosion Allowance. In piping design, this refers to an added safety thickness on pressure-containing parts to compensate for corrosion over the valve's service life.
Typically applied to carbon steel, CRA values like 1.5 mm, 3 mm, or 6 mm are added on top of standard wall thicknesses according to ASME B16.34 or API 600.
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