[Code of Federal Regulations]
[Title 40, Volume 9, Part 63 (Secs. 63.1200_End]
[Revised as of July 1, 1999]
From the U.S. Government Printing Office via GPO Access
[CITE: 40CFR63.1275]

[Page 119-120]
 
                   TITLE 40--PROTECTION OF ENVIRONMENT
 
               CHAPTER I--ENVIRONMENTAL PROTECTION AGENCY
 
PART 63--NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS FOR SOURCE CATEGORIES--Table of Contents
 
 Subpart HHH--National Emission Standards for Hazardous Air Pollutants 
          From Natural Gas Transmission and Storage Facilities
 
Sec. 63.1275  Glycol dehydration unit process vent standards.

    (a) This section applies to each glycol dehydration unit, subject to 
this subpart, with an actual annual average natural gas flowrate equal 
to or greater than 283 thousand standard cubic meters per day and with 
actual average benzene glycol dehydration unit process vent emissions 
equal to or greater than 0.90 megagrams per year.
    (b) Except as provided in paragraph (c) of this section, an owner or 
operator

[[Page 120]]

of a glycol dehydration unit process vent shall comply with the 
requirements specified in paragraphs (b)(1) and (b)(2) of this section.
    (1) For each glycol dehydration unit process vent, the owner or 
operator shall control air emissions by either paragraph (b)(1)(i) or 
(b)(1)(ii) of this section.
    (i) The owner or operator shall connect the process vent to a 
control device or a combination of control devices through a closed-vent 
system. The closed-vent system shall be designed and operated in 
accordance with the requirements of Sec. 63.1281(c). The control 
device(s) shall be designed and operated in accordance with the 
requirements of Sec. 63.1281(d).
    (ii) The owner or operator shall connect the process vent to a 
control device or a combination of control devices through a closed-vent 
system and the outlet benzene emissions from the control device(s) shall 
be less than 0.90 megagrams per year. The closed-vent system shall be 
designed and operated in accordance with the requirements of 
Sec. 63.1281(c). The control device(s) shall be designed and operated in 
accordance with the requirements of Sec. 63.1281(d), except that the 
performance requirements specified in Sec. 63.1281(d)(1)(i) and (ii) do 
not apply.
    (2) One or more safety devices that vent directly to the atmosphere 
may be used on the air emission control equipment installed to comply 
with paragraph (b)(1) of this section.
    (c) As an alternative to the requirements of paragraph (b) of this 
section, the owner or operator may comply with one of the following:
    (1) The owner or operator shall control air emissions by connecting 
the process vent to a process natural gas line.
    (2) The owner or operator shall demonstrate, to the Administrator's 
satisfaction, that the total HAP emissions to the atmosphere from the 
glycol dehydration unit process vent are reduced by 95.0 percent through 
process modifications or a combination of process modifications and one 
or more control devices, in accordance with the requirements specified 
in Sec. 63.1281(e).
    (3) Control of HAP emissions from a GCG separator (flash tank) vent 
is not required if the owner or operator demonstrates, to the 
Administrator's satisfaction, that total emissions to the atmosphere 
from the glycol dehydration unit process vent are reduced by one of the 
levels specified in paragraphs (c)(3)(i) through (c)(3)(ii), through the 
installation and operation of controls as specified in paragraph (b) (1) 
of this section.
    (i) HAP emissions are reduced by 95.0 percent or more.
    (ii) Benzene emissions are reduced to a level less than 0.90 
megagrams per year.