[Code of Federal Regulations]
[Title 49, Volume 4]
[Revised as of October 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR230.48]

[Page 331-332]
 
                        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. 230.48  Number and capacity.

    (a) Number and capacity. Every boiler shall be equipped with at 
least two safety relief valves, suitable for the service intended, that 
are capable of preventing an accumulation of pressure greater than 6 
percent above the MAWP under any conditions of service. An FRA inspector 
may require verification of sufficient safety valve relieving capacity.
    (b) Determination of capacity. Safety relief valve capacity may be 
determined by making an accumulation test with the fire in good, bright 
condition

[[Page 332]]

and all steam outlets closed. Additional safety relief valve capacity 
shall be provided if the safety relief valves allow an excess pressure 
of more than 6 percent above the MAWP during this test.