Required Minimum SO 2 Emission Reduction Efficiency (Z c )

H 2 S content of acid gas (Y), % Sulfur feed rate (X), LT/D 2.0 ≤ X ≤ 5.0 5.0 < X ≤ 15.0 15.0 < X ≤ 300.0 X > 300.0 Y ≥ 50 74.0 85.35X 0.0144 Y 0.0128 or 99.9, whichever is smaller. 20 ≤ Y < 50 74.0 85.35X 0.0144 Y 0.0128 or 97.5, whichever is smaller 97.5 10 ≤ Y < 20 74.0 85.35X 0.0144 Y 0.0128 or 90.8, whichever is smaller 90.8 90.8 Y < 10 74.0 74.0 74.0 74.0 X = The sulfur feed rate from the sweetening unit ( i.e., the H 2 S in the acid gas), expressed as sulfur, Mg/D(LT/D), rounded to one decimal place. Y = The sulfur content of the acid gas from the sweetening unit, expressed as mole percent H 2 S (dry basis) rounded to one decimal place. Z = The minimum required sulfur dioxide (SO 2 ) emission reduction efficiency, expressed as percent carried to one decimal place. Z i refers to the reduction efficiency required at the initial performance test. Z c refers to the reduction efficiency required on a continuous basis after compliance with Z i has been demonstrated. [78 FR 58447, Sept. 23, 2013]