(a) This section applies to each glycol dehydration unit subject to this subpart that must be controlled for air emissions as specified in paragraph (c)(1) of Sec. 63.1274.
(b) Except as provided in paragraph (c) of this section, an owner or operator 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 (iii) of this section.
(i) The owner or operator of a large glycol dehydration unit, as defined in Sec. 63.1271, 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 of a large glycol dehydration unit 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.
(iii) You must limit BTEX emissions from each existing small glycol dehydration unit, as defined in Sec. 63.1271, to the limit determined in Equation 1 of this section. You must limit BTEX emissions from each new small glycol dehydration unit process vent, as defined in Sec. 63.1271, to the limit determined in Equation 2 of this section. The limits determined using Equation 1 or Equation 2, of this section, must be met in accordance with one of the alternatives specified in paragraphs (b)(1)(iii)(A) through (D) of this section.[GRAPHIC] [TIFF OMITTED] TR16AU12.012 Where: ELBTEX = Unit-specific BTEX emission limit, megagrams per
year;3.10 x 10-4 = BTEX emission limit, grams BTEX/standard cubic
meter-ppmv;Throughput = Annual average daily natural gas throughput, standard cubic
meters per day;Ci,BTEX = Annual average BTEX concentration of the natural
gas at the inlet to the glycol dehydration unit, ppmv.
[GRAPHIC] [TIFF OMITTED] TR16AU12.013
Where: ELBTEX = Unit-specific BTEX emission limit, megagrams per
year;5.44 x 10-5 = BTEX emission limit, grams BTEX/standard cubic
meter-ppmv;Throughput = Annual average daily natural gas throughput, standard cubic
meters per day;Ci,BTEX = Annual average BTEX concentration of the natural
gas at the inlet to the glycol dehydration unit, ppmv.
(A) Connect the process vent to a control device or 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(f).
(B) Meet the emissions limit through process modifications in accordance with the requirements specified in Sec. 63.1281(e).
(C) Meet the emission limit for each small glycol dehydration unit using a combination of process modifications and one or more control devices through the requirements specified in paragraphs (b)(1)(iii)(A) and (B) of this section.
(D) Demonstrate that the emissions limit is met through actual uncontrolled operation of the small glycol dehydration unit. Document operational parameters in accordance with the requirements specified in Sec. 63.1281(e) and emissions in accordance with the requirements specified in Sec. 63.1282(a)(3).
(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 large 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 paragraph (c)(3)(i) through (iv) through the installation and operation of controls as specified in paragraph (b)(1) of this section.
(i) For any large glycol dehydration unit, HAP emissions are reduced by 95.0 percent or more.
(ii) For any large glycol dehydration unit, benzene emissions are reduced to a level less than 0.90 megagrams per year.
(iii) For each existing small glycol dehydration unit, BTEX emissions are reduced to a level less than the limit calculated in Equation 1 of paragraph (b)(1)(iii) of this section.
(iv) For each new small glycol dehydration unit, BTEX emissions are reduced to a level less than the limit calculated in Equation 2 of paragraph (b)(1)(iii) of this section.[64 FR 32648, June 17, 1999, as amended at 66 FR 34556, June 29, 2001; 77 FR 49586, Aug. 16, 2012] Sec. Sec. 63.1276-63.1280 [Reserved]