No person may permit the emission into the outdoor atmosphere of a waste gas stream from an ethylene production plant or facility unless the gas stream is properly burned at no less than 1,300°F for at least .3 seconds; except that no person may permit the emission of volatile organic compounds in gaseous form into the outdoor atmosphere from a vapor blowdown system unless these gases are burned by smokeless flares.
25 Pa. Code § 129.65
This section cited in 25 Pa. Code § 129.51 (relating to general); 25 Pa. Code § 129.91 (relating to control of major sources of NOx and VOCs); 25 Pa. Code § 129.96 (relating to applicability); and 25 Pa. Code § 129.111 (relating to applicability).