[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: 49CFR230.49]



[Page 429]

 

                        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 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.