[Code of Federal Regulations]
[Title 49, Volume 4]
[Revised as of October 1, 2003]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR230.49]

[Page 345-346]
 
                        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. 230.49  Setting of safety relief valves.

    (a) Qualifications of individual who adjusts. Safety relief valves 
shall be set and adjusted by a competent person who is thoroughly 
familiar with the

[[Page 346]]

construction and operation of the valve being set.
    (b) Opening pressures. At least one safety relief valve shall be set 
to open at a pressure not exceeding the MAWP. Safety relief valves shall 
be set to open at pressures not exceeding 6 psi above the MAWP.
    (c) Setting procedures. When setting safety relief valves, two steam 
gauges shall be used, one of which must be so located that it will be in 
full view of the persons engaged in setting such valves; and if the 
pressure indicated by the gauges varies more than 3 psi they shall be 
removed from the boiler, tested, and corrected before the safety relief 
valves are set. Gauges shall in all cases be tested immediately before 
the safety relief valves are set or any change made in the setting. When 
setting safety relief valves, the water level shall not be higher than 
\3/4\ of the length of the visible water glass, as measured from the 
bottom of the glass.
    (d) Labeling of lowest set pressure. The set pressure of the lowest 
safety relief valve shall be indicated on a tag or label attached to the 
steam gauge so that it may be clearly read while observing the steam 
gauge.