(a) Except as provided in paragraphs (c), (d), and (e) of this section, the requirements of this subpart apply to the owner or operator of each phosphoric acid manufacturing plant.
(b) The requirements of this subpart apply to emissions of hazardous air pollutants (HAPs) emitted from the following new or existing affected sources at a phosphoric acid manufacturing plant:
(1) Each wet-process phosphoric acid process line. The requirements of this subpart apply to the following emission points which are components of a wet-process phosphoric acid process line: reactors, filters, evaporators, and hot wells;
(2) Each evaporative cooling tower at a phosphoric acid manufacturing plant;
(3) Each phosphate rock dryer located at a phosphoric acid manufacturing plant;
(4) Each phosphate rock calciner located at a phosphoric acid manufacturing plant;
(5) Each superphosphoric acid process line. The requirements of this subpart apply to the following emission points which are components of a superphosphoric acid process line: evaporators, hot wells, acid sumps, and cooling tanks; and
(6) Each purified acid process line. The requirements of this subpart apply to the following emission points which are components of a purified phosphoric acid process line: solvent extraction process equipment, solvent stripping and recovery equipment, seal tanks, carbon treatment equipment, cooling towers, storage tanks, pumps and process piping.
(c) The requirements of this subpart do not apply to the owner or operator of a new or existing phosphoric acid manufacturing plant that is not a major source as defined in Sec. 63.2.
(d) The provisions of this subpart do not apply to research and development facilities as defined in Sec. 63.601.
(e) The emission limitations and operating parameter requirements of this subpart do not apply during periods of startup, shutdown, or malfunction, as those terms are defined in Sec. 63.2, provided that the source is operated in accordance with Sec. 63.6(e)(1)(i). [57 FR 61992, Dec. 29, 1992, as amended at 67 FR 65076, Dec. 17, 2001; 71 FR 20457, Apr. 20, 2006]