[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: 46CFR59.15-1]

[Page 285-286]
 
                           TITLE 46--SHIPPING
 
   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)
 
PART 59_REPAIRS TO BOILERS, PRESSURE VESSELS AND APPURTENANCES--Table of Contents
 
               Subpart 59.15_Miscellaneous Boiler Repairs
 
Sec. 59.15-1  Furnace repairs.


    (a) Where corrugated or plain furnaces or flues are distorted by 
1\1/2\ inches or more, they shall be repaired by either of the following 
methods:
    (1) The furnace shall be forced back to a true circular shape, and 
the Officer in Charge, Marine Inspection, may require strongbacks or 
other acceptable means of support to hold the furnace from future 
collapse, if in his opinion such support is necessary; or,
    (2) The furnace shall be adequately stayed as found necessary in the 
judgment of the Officer in Charge, Marine Inspection.
    (b) Distortion means the difference between any single measured 
diameter of the furnace and the diameter of a true circle at the same 
location. The diameter of the true circle may be taken as the original 
furnace diameter or may be determined by a means acceptable to the 
Officer in Charge, Marine Inspection.
    (c) Where the distortion does not exceed 1\1/2\ inches it will not 
be necessary to force the furnace back to a true circle if the allowable 
pressure is reduced in the ratio of 1\1/2\ percent for each one-tenth of 
an inch of distortion. However, if the maximum distortion does not 
exceed 1 inch and the length of the distorted area is not more than 
three corrugations, or, if the maximum distortion does not exceed three-
fourths inch for a length greater than three corrugations of distorted 
area, the repairs or reduction in pressure will not be required unless 
considered necessary by the marine inspector.
    (d) When it becomes necessary to rivet a patch to a furnace or other 
part of the heating surface, the riveted patch shall be placed on the 
waterside of the plate in order not to form a pocket in which sediment 
may collect.
    (e) Furnace crowns which have become distorted, not in excess of the 
limitations provided in paragraph (c) of this section, may be repaired 
by pumping back the distorted section to as nearly a true circle as 
possible and reinforcing the same by means of a ring, arc- or gas-welded 
to the distorted corrugation as shown in Figure 59.15-1, the welding to 
be done by welders and welding processors qualified in accordance with 
part 57 of this subchapter using acceptable welding electrodes in 
accordance with Sec. 57.02-4 of this subchapter.

[[Page 286]]

[GRAPHIC] [TIFF OMITTED] TC01FE91.037

Figure 59.15-1--Approved method of reinforcing furnaces by means of arc 
                             or gas welding