[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: 46CFR57.06-2]

[Page 246]
 
                           TITLE 46--SHIPPING
 
   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (CONTINUED)
 
PART 57_WELDING AND BRAZING--Table of Contents
 
                     Subpart 57.06_Production Tests
 
Sec. 57.06-2  Production test plate interval of testing.

    (a) At least one set of production test plates shall be welded for 
each Class I or Class I-L pressure vessel except as follows:
    (1) When the extent of welding on a single vessel exceeds 50 lineal 
feet of either or both longitudinal and circumferential joints, at least 
one set of test plates shall be welded for each 50 feet of joint.
    (2) When the extent of welding on vessels welded in succession 
exceeds 50 lineal feet of either or both longitudinal and 
circumferential joints, at least one set of test plates shall be welded 
for each 50 feet of aggregate joint of the same material where the plate 
thicknesses fall within a range of one-fourth inch. For each 50-foot 
increment of weld, test plates shall be prepared at the time of 
fabrication of the first vessel involving that increment.
    (b) Production test plates for Class II-L pressure vessels shall be 
prepared as for Classes I and I-L vessels except that the provisions of 
paragraphs (a)(1) and (2) of this section are applicable to each 150 
lineal feet of welded joint in lieu of each 50 lineal feet.
    (c) In the case of Class II pressure vessels no more than one set of 
production test plates need be prepared for each 300 lineal feet of 
either or both longitudinal and circumferential joints. In the case of 
single vessel fabrication a set of test plates is required for each 300 
lineal feet of weld or fraction thereof. In the case of multiple vessel 
fabrication where each increment of 300 lineal feet of weld involves 
more than one pressure vessel, the set of test plates shall be prepared 
at the time of fabrication of the first vessel involving that increment.