49 CFR 230.24 - Maximum allowable stress.

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§ 230.24 Maximum allowable stress.

(a)Maximum allowable stress value. The maximum allowable stress value on any component of a steam locomotive boiler shall not exceed 1/4 of the ultimate tensile strength of its material.

(b)Safety factor. When it is necessary to use the code of original construction in boiler calculations, the safety factor value shall not be less than 4.

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