[Code of Federal Regulations]
[Title 49, Volume 3]
[Revised as of October1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR192.109]

[Page 37]
 
                        TITLE 49--TRANSPORTATION
 
 CHAPTER I--RESEARCH AND SPECIAL PROGRAMS ADMINISTRATION, DEPARTMENT OF 
                       TRANSPORTATION (CONTINUED)
 
PART 192--TRANSPORTATION OF NATURAL AND OTHER GAS BY PIPELINE: MINIMUM FEDERAL SAFETY STANDARDS--Table of Contents
 
                         Subpart C--Pipe Design
 
Sec. 192.109  Nominal wall thickness (t) for steel pipe.

    (a) If the nominal wall thickness for steel pipe is not known, it is 
determined by measuring the thickness of each piece of pipe at quarter 
points on one end.
    (b) However, if the pipe is of uniform grade, size, and thickness 
and there are more than 10 lengths, only 10 percent of the individual 
lengths, but not less than 10 lengths, need be measured. The thickness 
of the lengths that are not measured must be verified by applying a 
gauge set to the minimum thickness found by the measurement. The nominal 
wall thickness to be used in the design formula in Sec. 192.105 is the 
next wall thickness found in commercial specifications that is below the 
average of all the measurements taken. However, the nominal wall 
thickness used may not be more than 1.14 times the smallest measurement 
taken on pipe less than 20 inches (508 millimeters) in outside diameter, 
nor more than 1.11 times the smallest measurement taken on pipe 20 
inches (508 millimeters) or more in outside diameter.

[35 FR 13257, Aug. 19, 1970, as amended by Amdt. 192-85, 63 FR 37502, 
July 13, 1998]