[Code of Federal Regulations]

[Title 49, Volume 4]

[Revised as of October 1, 2005]

From the U.S. Government Printing Office via GPO Access

[CITE: 49CFR230.24]



[Page 424]

 

                        TITLE 49--TRANSPORTATION

 

       CHAPTER II--FEDERAL RAILROAD ADMINISTRATION, DEPARTMENT OF 

                             TRANSPORTATION

 

PART 230_STEAM LOCOMOTIVE INSPECTION AND MAINTENANCE STANDARDS--Table 

of Contents

 

                   Subpart B_Boilers and Appurtenances

 

Sec. 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.