[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: 46CFR54.20-3]

[Page 162]
 
                           TITLE 46--SHIPPING
 
   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)
 
PART 54_PRESSURE VESSELS--Table of Contents
 
                  Subpart 54.20_Fabrication by Welding
 
Sec. 54.20-3  Design (modifies UW-9, UW-11(a), UW-13, and UW-16).

    (a) Fabrication by welding shall be in accordance with the 
provisions of this part and with part 57 of this subchapter.
    (b) Welding subject to UW-11(a) of the ASME Code shall be modified 
as described in Sec. 54.25-8 for radiographic examination.
    (c) A butt welded joint with one plate edge offset, as shown in 
Figure UW-13.1(k) of the ASME Code, may only be used for circumferential 
joints of Class II and Class III pressure vessels.
    (d) Attachment welds for nozzles and other connections shall be in 
accordance with UW-16 of the ASME Code. When nozzles or connections are 
made to pressure vessels, as shown in Figure UW-16.1 (a) and (c) of the 
ASME Code, and are welded from one side only, backing strips shall be 
used unless it can be determined visually that a full penetration weld 
has been achieved.
    (e) When fabricating by welding the minimum joint requirements shall 
be as specified under the column headed ``minimum joint requirements'' 
in Table 54.01-5(b) for various classes of pressure vessels.
    (f) Joints in Class II or III pressure vessel cargo tanks must meet 
the following:
    (1) Category A and B joints must be type (1) or (2).
    (2) Category C and D joints must have full penetration welds 
extending through the entire thickness of the vessel wall or nozzle 
wall.

[CGFR 68-82, 33 FR 18828, Dec. 18, 1968, as amended by CGD 77-147, 47 FR 
21810, May 20, 1982; CGD 85-061, 54 FR 50964, Dec. 11, 1989]