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Maximum allowable crack length, visible on the surface of a dense firebrick, is:
Correct Answer: C
API Std 936 defines crack length acceptance as follows: "Surface cracks in dense firebrick shall not exceed 1/2 in. (13 mm) in length and shall not extend through the thickness of the brick." - API Std 936, Section 8.3.3 Therefore, Option C is the correct maximum allowable length for a visible crack on firebrick.