[Code of Federal Regulations]
[Title 49, Volume 4]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR230.48]

[Page 384-385]
 
                        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

[[Page 385]]

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 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.