[Code of Federal Regulations]
[Title 49, Volume 3]
[Revised as of October1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR192.145]

[Page 40]
 
                        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 D--Design of Pipeline Components
 
Sec. 192.145  Valves.

    (a) Except for cast iron and plastic valves, each valve must meet 
the minimum requirements, or equivalent, of API 6D. A valve may not be 
used under operating conditions that exceed the applicable pressure-
temperature ratings contained in those requirements.
    (b) Each cast iron and plastic valve must comply with the following:
    (1) The valve must have a maximum service pressure rating for 
temperatures that equal or exceed the maximum service temperature.
    (2) The valve must be tested as part of the manufacturing, as 
follows:
    (i) With the valve in the fully open position, the shell must be 
tested with no leakage to a pressure at least 1.5 times the maximum 
service rating.
    (ii) After the shell test, the seat must be tested to a pressure not 
less than 1.5 times the maximum service pressure rating. Except for 
swing check valves, test pressure during the seat test must be applied 
successively on each side of the closed valve with the opposite side 
open. No visible leakage is permitted.
    (iii) After the last pressure test is completed, the valve must be 
operated through its full travel to demonstrate freedom from 
interference.
    (c) Each valve must be able to meet the anticipated operating 
conditions.
    (d) No valve having shell components made of ductile iron may be 
used at pressures exceeding 80 percent of the pressure ratings for 
comparable steel valves at their listed temperature. However, a valve 
having shell components made of ductile iron may be used at pressures up 
to 80 percent of the pressure ratings for comparable steel valves at 
their listed temperature, if:
    (1) The temperature-adjusted service pressure does not exceed 1,000 
p.s.i. (7 Mpa) gage; and
    (2) Welding is not used on any ductile iron component in the 
fabrication of the valve shells or their assembly.
    (e) No valve having pressure containing parts made of ductile iron 
may be used in the gas pipe components of compressor stations.

[35 FR 13257, Aug. 19, 1970, as amended by Amdt. 192-62, 54 FR 5628, 
Feb. 6, 1989; Amdt. 192-85, 63 FR 37502, July 13, 1998]