Outdated Exemption List, Subchapter G - December 24, 1998
30 TAC 106 - Subchapter Combustion
(a) Small boilers, heaters, drying or curing ovens, furnaces, or other combustion units, but not including stationary internal combustion engines or turbines, are exempt provided that all the conditions of this section are met.
(b) Combustion units may burn used oil as a fuel as long as the used oil has not been mixed with hazardous waste and the combustion unit meets the following conditions:
(1) the combustion unit or combination of combustion units at the same account have a maximum capacity of 1.0 million Btu per hour (MMBtu/hr) and each individual combustion unit is not greater than 0.5 MMBtu/hr;
(2) the combustion gases from the combustion unit(s) are vented to the ambient air in accordance with the following requirements:
(A) through an unobstructed vent; or
(B) through a vertical vent with a cap; and
(i) a flat roof, through a minimum of a three-foot stack; or
(ii) a sloped roof, through a stack that is at least three feet higher than the highest point on the roof or three feet higher than a point extending ten feet horizontally from the roof; and
(3) the combustion unit(s) burns only used oil the owner or operator generates on-site or used oil received from household do-it-yourself used oil generators.
Kilns used for firing ceramic ware, heated exclusively by natural gas, liquid petroleum gas, electricity, or any combination thereof are exempt where the conditions of this section are met:
(1) the total heat input is ten million British thermal units per hour or less; and
(2) there are no emissions of lead, beryllium, or fluorides, and emissions of sulfur dioxide and particulate matter from both the material being fired and fuel burned do not exceed 25 tons per year of either air contaminant.
Boilers, heaters, drying or curing ovens, furnaces, or other combustion units, but not including stationary internal combustion engines or turbines are exempt, 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.
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