(a) Except as provided in Subsection (b) of this section, if a plant operating under this subchapter commingles casinghead gas with sweet gas or sour gas or both, the operator of the plant shall not blow, or permit to be blown, in the air any of the residue gas remaining after the gasoline content of the gas is extracted.
(b) The operator of a plant may blow in the air an amount of residue gas from the plant that is determined by the commission to be necessary to accomplish uninterrupted deliveries in required amounts to carbon black plants for carbon black manufacture.