Subpart Y collects the following data about your sulfur recovery plant:

• Maximum rated throughput of the sulfur recovery plant (metric tons sulfur per stream day)
• Type of sulfur recovery plant:
  • Caustic scrubber
  • Claus
  • Lo-cat
  • Sulfuric acid plant
  • Other (specify)
• Method used to calculate the CO₂ emissions. Specify either Equation Y-12 or Process Vent Method. [Only appears if No is selected for using a CEMS. For Claus Plants (that do not use a CEMS according to Subpart C), Equation Y-12 must be used. For non-Claus plants (that do not use a CEMS according to Subpart C), either Equation Y-12 or the Process Vent Method may be used.]
• Indicate whether, if you recycle tail gas, the recycled flow rate and carbon content of recycled tail gas is included in the measured volumetric flow and carbon mole fraction data. If you do not recycle tail gas, please select No. [This question appears only if Equation Y-12 is selected]. Click either Yes or No.
• Indicate if a correction for CO₂ emissions in the tail gas is used. [This question appears only if Yes is selected for previous question]. Click either Yes or No. Note that per Section 98.253(f)(5), if tail gas is recycled to the front of the sulfur recovery plant and the recycled flow rate and carbon content is included in the measured data, then the annual CO₂ emissions must be corrected to avoid double counting these emissions.