49 CFR 230.24 - Maximum allowable stress.

Regulations last checked for updates: Feb 11, 2026

Title 49 - Transportation last revised: Feb 03, 2026

View all text of Subpart B [§ 230.23 - § 230.65]

§ 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.

authority: 49 U.S.C. 20103,20107,20702; 28 U.S.C. 2461 note; and 49 CFR 1.89

source: 64 FR 62865, Nov. 17, 1999, unless otherwise noted.

cite as: 49 CFR 230.24