TITLE 49 - TRANSPORTATION

SUBTITLE B - OTHER REGULATIONS RELATING TO TRANSPORTATION

CHAPTER II - FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF TRANSPORTATION

PART 230 - STEAM LOCOMOTIVE INSPECTION AND MAINTENANCE STANDARDS

subpart b - BOILERS AND APPURTENANCES

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.