[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: 46CFR59.10-35]

[Page 284-285]
 
                           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 59.10_Welding Repairs to Boilers and Pressure Vessels in Service
 
Sec. 59.10-35  Wrapper plates and back heads.

    Wrapper plates and back heads may be renewed in whole or repaired as 
follows:
    (a) Wrapper plates or backs heads shall be cut between two rows of 
staybolts or on a line of staybolts where the thickness is approximately 
the same as the original construction. If welding is employed on a line 
of staybolts, the staybolts shall be fitted with a welded collar as 
required by Figure 52.01-3 of this subchapter.
    (b) The edges of wrapper plates riveted to tube sheets and back 
heads shall be removed by cutting out the rivets.
    (c) The edges of existing plates and new plates shall be beveled by 
chipping, flame cutting or grinding so as to form a suitable groove 
whereby complete penetration of the weld metal will be obtained. The 
edge preparation and preheat shall comply with the requirements of Sec. 
59.10-5(h).
    (d) The edges of the new plate shall be buttwelded and the plate 
shall be riveted to the flanges of the tube sheet and back heads and the 
staybolts renewed.

[[Page 285]]

    (e) Sections of wrapper plates of combustion chambers outside of 
stayed areas may be repaired by welding provided the welded joints are 
stress-relieved by means of controlled heat and the joints are 
nondestructively tested.