Boilers, heaters, drying or curing ovens, furnaces, or other combustion units, but not including stationary internal combustion engines or turbines are permitted by rule, provided that the following conditions are met.
  (1) The only emissions shall be products of combustion of the fuel.
  (2) The maximum heat input shall be 40 million British thermal unit (Btu) per hour with the fuel being:
    (A) sweet natural gas;
    (B) liquid petroleum gas;
    (C) fuel gas containing no more than 0.1 grain of total sulfur compounds, calculated as sulfur, per dry standard cubic foot; or
    (D) combinations of the fuels in subparagraphs (A) - (C) of this paragraph.
  (3) Distillate fuel oil shall be fired as a backup fuel only. Firing shall be limited to 720 hours per year. The fuel oil shall contain less than 0.3% sulfur by weight and shall not be blended with waste oils or solvents.
  (4) All gas fired heaters and boilers with a heat input greater than ten million Btu per hour (higher heating value) shall be designed such that the emissions of nitrogen oxides shall not exceed 0.1 pounds per million Btu heat input.
  (5) Records of hours of fuel oil firing and fuel oil purchases shall be maintained on-site on a two-year rolling retention period and made available upon request to the commission or any local air pollution control agency having jurisdiction.

Source Note: The provisions of this §106.183 adopted to be effective June 18, 1997, 22 TexReg 5668; amended to be effective September 4, 2000, 25 TexReg 8653