Outdated Standard Exemptions 7 - 61, September 13, 1993
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(a) The only emissions shall be products of combustion of the fuel.
(b) The maximum heat input shall be 40 million British thermal unit (Btu) per hour with the fuel being:
(1) Sweet natural gas, or
(2) Liquid petroleum gas, or
(3) Fuel gas containing no more than 0.1 grain of total sulfur compounds, calculated as sulfur, per dry standard cubic foot, or
(4) Combinations of the above fuels.
(c) If oil fired, the maximum heat input shall be 10 million Btu/hr with the fuel containing less than 0.3% by weight sulfur and being a petroleum distillate oil that is not a blend containing waste oils or solvents.
(d) All gas fired heaters and boilers with a heat input greater than 10 million Btu per hour (higher heating value) shall be equipped with staged combustion burners to minimize formation of oxides of nitrogen.
8.Water cooling towers, water treating systems for process cooling water or boiler feedwater, and water tanks, reservoirs, or other water containers designed to cool, store, or otherwise handle water (including rainwater) that have not been used in direct contact with gaseous or liquid process streams containing carbon compounds, sulfur compounds, halogens or halogen compounds, cyanide compounds, inorganic acids, or acid gases.
10.Presses used exclusively for extruding metals, minerals, plastics, rubber, or wood except where halogenated carbon compounds or hydrocarbon solvents are used as foaming agents. Presses used for extruding scrap materials or reclaiming scrap materials are not exempt.
(a) The emission of volatile organic compounds (VOC) and solvents (including, but not limited to, those used for printing, cleanup, or makeup) shall not exceed the following rates:
(1) 15 tons per year (tpy) for any press proposed to be covered by this standard exemption, and
(2) 25 tpy for all printing presses on the property covered by standard exemptions.
(b) Printing presses covered by this standard exemption shall not utilize heat set, thermo set, or oven dried inks.
(c) If total VOC emissions and solvents (including, but not limited to, printing, cleanup, and makeup solvents) from the property exceed 10 tpy, the owner or operator of the facility shall keep records in sufficient detail to enable the Texas Natural Resource Conservation Commission to determine ink and solvent usage in pounds (minus water) on a monthly and calendar year-to-date basis. Documentation of the usage determination method and all data shall be maintained for a two-year rolling retention period. This information must be in sufficient detail to show compliance with condition (a) of this exemption.
(a) Equipment used for conveying of powders or resins to storage silos must be equipped with fabric filter(s) having a maximum filtering velocity of 4.0 feet per minute (ft/min) with mechanical shaking or 7.0 ft/min with air cleaning, and
(b) Transfer of powders or resins is accomplished in an enclosed system.
(a) the total heat input is 10 million British thermal units (BTU) per hour or less, and
(b) 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.
40.Hand-held or manually operated equipment used for buffing, polishing, carving, cutting, drilling, machining, routing, sanding, sawing, surface grinding, or turning of ceramic art work, ceramic precision parts, leather, metals, plastics, fiber board, masonry, carbon, glass, graphite, or wood.
41.Equipment using aqueous solutions for anodizing, electrodeposition, electroless plating, electrolytic polishing, and stripping of brass, bronze, cadmium, copper, iron, lead, nickel, tin, zinc, and precious metals; and for cleaning, stripping, etching, or other surface preparation; but not including chemical milling or electrolytic metal recovery and reclaiming systems.
(a) Organic solvents, diluents, or thinners shall not be used.
(b) Material in powder form shall not be added unless the mixer, blender, roll mill, or calender is vented to a fabric filter having a maximum filtering velocity of 4.0 feet per minute (ft/min) with mechanical cleaning, or 7.0 ft/min with automatic air cleaning.
(c) There shall be no visible emissions.
Mixers, blenders, roll mills, or calenders handling or adding asbestos shall not be eligible for this exemption.
48.Roll mills or calenders for rubber or plastics in which organic solvents, diluents, or thinners are used, provided that before construction begins, the facility is registered with Form PI-7 and information regarding process rate and type of material emitted is submitted.
50.Containers, reservoirs, or tanks used exclusively for dipping operations for coating objects with oils, waxes, or greases where no organic solvents, diluents, or thinners are used; or dipping operations for applying coatings of natural or synthetic resins which contain no organic solvents.
51.Liquid loading or unloading equipment for railcars, tank trucks, or drums; storage containers, reservoirs, tanks; and change of service of material loaded, unloaded, or stored, provided that no visible emissions result and the chemicals loaded, unloaded, or stored are limited to:
(a) the following list:
asphalt, waxes, wax emulsions, resins, polymers, vegetable oils, soaps, detergents, greases,
lube oils, lube oil additives, animal fats, fuel oils, kerosene, diesel fuels
(b) water or wastewater,
(c) aqueous salt solutions,
(d) aqueous caustic solutions, except ammonia solutions,
(e) inorganic acids except oleum, hydrofluoric, and hydrochloric acids,
(f) aqueous ammonia solutions if vented through a water scrubber,
(g) hydrochloric acid if vented through a water scrubber,
(h) acetic acid if vented through a water scrubber,
(i) organic liquids having an initial boiling point of 300 degrees Fahrenheit or greater. Facilities loading, unloading, or storing butyric acid, isobutyric acid, methacrylic acid, mercaptans, croton oil, 2-methyl styrene, or any other compound with an initial boiling point of 300 degrees Fahrenheit or greater listed in 40 Code of Federal Regulations 261, Appendix VIII shall be located at least 500 feet from any recreational area or residence or other structure not occupied or used solely by the owner of the facility or the owner of the property upon which the facility is located.
53.Organic liquids loading or unloading equipment for railcars, tank trucks, or drums; and storage containers, tanks, or change of service of the material loaded, unloaded, or stored, provided that all of the following conditions are met:
(a) Uncontrolled emissions calculated using the version of AP-42 in effect at the time are less than 25 tons per year of organic compounds or of any other air contaminant.
(b) The loading rate of the facilities does not exceed 20,000 gallons per day averaged over any consecutive 30-day period.
(c) The capacity of any tank does not exceed 25,000 gallons except that tanks having a capacity of less than 40,000 gallons may be used to store sweet crude oil, sweet natural gas condensate, gasoline, and petroleum fuels.
(d) The facilities are used exclusively for the loading, unloading, or storage of:
(1) Organic liquids normally used as solvents, diluents, thinners, inks, colorants, paints, lacquers, enamels, varnishes, liquid resins, or other surface coatings.
(2) Petroleum, petroleum fuels, other motor vehicle fuels, and natural gas liquids, none of which have a true vapor pressure of 11.0 psia or greater at maximum temperature of use.
(e) The facilities will meet any applicable requirements of Regulation V of the TNRCC.
(f) Facilities used for the loading, unloading, or storage of any compound listed in 40 Code of Federal Regulations 261, Appendix VIII are not exempt under this standard exemption.
57.Electrically heated or sweet natural gas or liquid petroleum gas fueled equipment used exclusively for heat treating, soaking, case hardening, or surface conditioning of metal objects, such as carbonizing, cyaniding, nitriding, carbonnitriding, siliconizing, or diffusion treating.
(a) Crucible furnaces, pot furnaces, or induction furnaces with a holding capacity of 1,000 pounds or less, with the following limitations:
(1) No smelting, reduction, sweating, metal separation, or distilling is conducted.
(2) In ferrous melting furnaces where gray iron or steel is melted.
(A) Ductile iron is not produced, and
(B) The furnace charge is free of oil, grease, and paint.
(3) In nonferrous melting furnaces, only the following metals are melted, poured, or held in a molten state:
(A) Aluminum or any alloy containing over 50% aluminum.
(B) Magnesium or any alloy containing over 50% magnesium.
(C) Tin or any alloy containing over 50% tin.
(D) Zinc or any alloy containing over 50% zinc.
(F) Precious metals.
(4) No lead, leaded brass, leaded bronze, or magnesium bronze is melted, poured, or held in a molten state.
(b) Aluminum melting or holding furnaces with a holding capacity of 2,000 pounds or less that melt only clean aluminum ingots or pigs and in which no refining, smelting, metal separation, sweating, distilling, or fluxing is performed.
(a) The facility performs only the following functions:
(6) taste and odor control,
(11) chlorine removal,
(12) activated sludge treatment, anaerobic treatment, and associated control of gases from these treatments,
(13) aerobic oxidation/biodegration using oxygen or peroxide in the absence of nitrogen or other gas that would cause stripping of volatile organic compounds (VOC) from the water,
(14) stripping VOC, ammonia, or other air contaminants from the water with air or other gas provided the stripped gases are controlled with an abatement system that meets the requirements of Standard Exemption 68(e). For ammonia or hydrogen chloride (HCl) or other acid gas emissions, abatement may include a water or caustic scrubbing system as a means of complying with this exemption. Final emissions of HCl resulting from combustion of chlorine or chlorine-containing compounds shall not exceed 0.1 pounds per hour,
(15) liquid phase separation of VOC and water in which: (1) the sum of the partial pressures of all species of VOC in any sample is less than 1.5 psia or (2) the separator is enclosed and emissions are vented through an emission abatement system meeting the requirements specified above for stripped VOC and ammonia.
* Chlorine or sulfur dioxide (SO2)shall be used only in containers approved by the United States Department of Transportation and emissions of chlorine or SO2 from treatment of water or decontamination of equipment at any water treatment plant shall not exceed 10 tons per year.
(b) The following shall not be exempted by this exemption:
(1) gas stripping or aeration facilities where VOC or other air contaminants are stripped from water directly to the atmosphere,
(2) disposal facilities using land surface treatment,
(3) surface facilities associated with injection wells,
(4) cooling towers in which VOC or other air contaminants may be stripped to the atmosphere.
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