[Code of Federal Regulations]
[Title 46, Volume 2]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 46CFR52.01-55]

[Page 127]
 
                           TITLE 46--SHIPPING
 
   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)
 
PART 52_POWER BOILERS--Table of Contents
 
                   Subpart 52.01_General Requirements
 
Sec. 52.01-55  Increase in maximum allowable working pressure.

    (a) When the maximum allowable working pressure of a boiler has been 
established, an increase in the pressure settings of its safety valves 
shall not be granted unless the boiler design meets the requirements of 
this subchapter in effect at the time the boiler was contracted for or 
built; but in no case will a pressure increase be authorized for boilers 
constructed prior to the effective date of the regulations dated 
November 19, 1952, if the minimum thickness found by measurement shows 
that the boiler will have a factor of safety of less than 4\1/2\. The 
piping system, machinery, and appurtenances shall meet the present 
requirements of this subchapter for the maximum allowable working 
pressure requested. An increase in pressure shall be granted only by the 
Commandant upon presentation of data or plans proving that the requested 
increase in pressure is justified.
    (b) When an existing boiler is replaced by a new boiler designed to 
operate at pressures in excess of the pressure indicated on the 
certificate of inspection for the previous boiler, an analysis of the 
complete system shall be made, including machinery and piping, to insure 
its compatibility with the increased steam pressure. The maximum 
allowable working pressure on the certificate of inspection shall be 
based on the results of this analysis.