[Code of Federal Regulations]
[Title 49, Volume 3]
[Revised as of October 1, 2004]
From the U.S. Government Printing Office via GPO Access
[CITE: 49CFR192.167]

[Page 47]
 
                        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. 192.167  Compressor stations: Emergency shutdown.

    (a) Except for unattended field compressor stations of 1,000 
horsepower (746 kilowatts) or less, each compressor station must have an 
emergency shutdown system that meets the following:
    (1) It must be able to block gas out of the station and blow down 
the station piping.
    (2) It must discharge gas from the blowdown piping at a location 
where the gas will not create a hazard.
    (3) It must provide means for the shutdown of gas compressing 
equipment, gas fires, and electrical facilities in the vicinity of gas 
headers and in the compressor building, except that:
    (i) Electrical circuits that supply emergency lighting required to 
assist station personnel in evacuating the compressor building and the 
area in the vicinity of the gas headers must remain energized; and
    (ii) Electrical circuits needed to protect equipment from damage may 
remain energized.
    (4) It must be operable from at least two locations, each of which 
is:
    (i) Outside the gas area of the station;
    (ii) Near the exit gates, if the station is fenced, or near 
emergency exits, if not fenced; and
    (iii) Not more than 500 feet (153 meters) from the limits of the 
station.
    (b) If a compressor station supplies gas directly to a distribution 
system with no other adequate source of gas available, the emergency 
shutdown system must be designed so that it will not function at the 
wrong time and cause an unintended outage on the distribution system.
    (c) On a platform located offshore or in inland navigable waters, 
the emergency shutdown system must be designed and installed to actuate 
automatically by each of the following events:
    (1) In the case of an unattended compressor station:
    (i) When the gas pressure equals the maximum allowable operating 
pressure plus 15 percent; or
    (ii) When an uncontrolled fire occurs on the platform; and
    (2) In the case of a compressor station in a building:
    (i) When an uncontrolled fire occurs in the building; or
    (ii) When the concentration of gas in air reaches 50 percent or more 
of the lower explosive limit in a building which has a source of 
ignition.

For the purpose of paragraph (c)(2)(ii) of this section, an electrical 
facility which conforms to Class 1, Group D, of the National Electrical 
Code is not a source of ignition.

[35 FR 13257, Aug. 19, 1970, as amended by Amdt. 192-27, 41 FR 34605, 
Aug. 16, 1976; Amdt. 192-85, 63 FR 37503, July 13, 1998]