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You are here: Home / Permitting / Air Permits / PermitByRule / Historical Rules / oldselist / Standard Exemptions for Jun. 92 / Outdated Standard Exemptions 81-89 June 18, 1992

Outdated Standard Exemptions 81-89 June 18, 1992

Outdated Title 30 TAC 116 Standard Exemptions organized by exemption number and date.

Standard Exemptions 81 - 89, June 18, 1992 Standard Exemption List

Clicking on a highlighted number below links you to the standard exemption.

81 | 82 | 83 | 84 | 85 | 86 | 87 | 88 | 89

81. Facilities that repackage chlorine, provided all the following conditions are satisfied:

(a) The repackaging shall be in United States Department of Transportation approved chlorine cylinders not exceeding one ton in capacity.

(b) There shall be no more than two tons of chlorine on the property at any time.

(c) All handling of chlorine shall be in accordance with applicable Chlorine Institute Guidelines.

(d) The facilities shall be located no closer than 300 feet from any recreational area or residence or other structure not occupied or used solely by the owner or operator of the facilities or the owner of the property upon which the facilities are located.

(e) The repackaging system shall be operated under vacuum at all times and all venting of lines and cylinders shall be routed to a caustic scrubbing system that prevents release of chlorine to the atmosphere during all operating and maintenance activities. When the scrubbing system is not operating properly, no chlorine shall be repackaged.

(f) Chlorine gas shall not be vented directly to the atmosphere under any circumstances.

82. Any vessel storing carbon compounds composed only of carbon, hydrogen, or oxygen, provided that the vessel vent is directed to an incinerator, boiler, or other firebox having a stationary flue or a waste gas flare system that will operate with no visible emissions except as provided by 30 TAC Chapter 101 for periods of maintenance or operational upset. However, vessels not exceeding 100 barrels capacity and storing only liquid petroleum gas may have the safety relief valve vent directly to the atmosphere. Also, any tank having a capacity not to exceed 1,000 gallons and storing only commercial odorants used to odorize petroleum gases may have the safety relief valve vent directly to the atmosphere.

83. Any tank or other container storing carbon compounds, provided that the tank or container pressure is sufficient at all times to prevent vapor or gas loss to the atmosphere or the tank or container is equipped with a relief valve which directs all vapors or gases to an incinerator, boiler, or other firebox having a stationary flue or a waste gas smokeless flare system. The vapors or gases and any necessary fuel gas shall be mixed thoroughly upstream of the heater burner(s) or the flare tip such that the mixed gases have a minimum net or lower heating value of 200 British thermal units per cubic foot. The flare also shall meet the other requirements of Standard Exemption 80.

84. Anhydrous ammonia storage tanks and distribution facilities that meet the following conditions:

(a) All valves, connectors, and hoses shall be properly maintained in leak-proof condition at all times.

(b) The capacity of the storage tanks is 30,000 gallons or less.

(c) When transferring ammonia, all vapors shall be vented back to the host tank and never to the atmosphere.

(d) When relieving pressure from connectors and hoses, all vapors shall be bled into an adequate volume of water and never to the atmosphere.

(e) Each tank is equipped to prevent unauthorized operation.

(f) Before construction begins, written site approval must be received from the Regional Director and the owner or operator shall file with the appropriate regional office a completed Form PI-7 and supporting documentation demonstrating that all of the requirements of the exemption will be met.

(g) The tank is located at least 1/4 mile from any recreational area or residence or other structure not occupied or used solely by the owner of the property upon which the facility is located.

85. All aqueous fertilizer storage tanks.

86. Any fixed or floating roof storage tank, or change of service in any tank, used to store chemicals or mixtures of chemicals shown in the enclosed Table 86A provided that the following conditions are met:

(a) The tank is located at least 500 feet away 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.

(b) The true vapor pressure of the compound to be stored is less than 11.0 psia at the maximum storage temperature.

(c) For those compounds that have a true vapor pressure greater than 0.5 psia and less than 11.0 psia at the maximum storage temperature, any storage vessel larger than 40,000 gallons capacity shall be equipped with an internal floating cover or equivalent control.

(1) An open top tank containing an external floating roof using double seal technology shall be an approved control alternative equivalent to an internal floating cover tank, provided the primary seal consists of either a mechanical shoe seal or a liquid-mounted seal. Double seals having a vapor-mounted primary seal are an approved alternative for existing open top floating roof tanks undergoing a change of service.

(2) The floating cover or floating roof design shall incorporate sufficient flotation to conform to the requirements of American Petroleum Institute Code 650, Appendix C or an equivalent degree of flotation.

(d) Compounds with a true vapor pressure of 0.5 psia or less at the maximum storage temperature may be stored in a fixed roof or cone roof tank which includes a submerged fill pipe or utilizes bottom loading.

(e) For fixed or cone roof tanks having no internal floating cover, all uninsulated tank exterior surfaces exposed to the sun shall be painted chalk white except where a dark color is necessary to help the tank absorb or retain heat in order to maintain the material in the tank in a liquid state.

(f) Emissions shall be calculated by methods specified in Section 4.3 of the current edition of the United States Environmental Protection Agency Publication AP-42. This document may be obtained from the Superintendent of Documents, Washington D.C. 20402. It is Stock Number 0550000251-7, Volume I.

(g) Before construction begins, storage tanks of 25,000 gallons or greater capacity and located in a designated nonattainment area for ozone shall be registered with the appropriate regional office using Form PI-7. The registration shall include a list of all tanks, calculated emissions for each carbon compound in tons per year for each tank, and a Table 7 of Form PI-2 for each different tank design.

(h) Mixtures of the chemicals listed in Table 86A which contain more than a total of 1.0% by volume of all other chemicals not listed in Table 86A are not covered by this exemption.

Table 86A

Approved Chemical List for Standard Exemption 86*

A. Compounds of the following classes containing only atoms of carbon and hydrogen, not including aromatic compounds:

Paraffins. Examples: hexane, pentane, octane, isooctane.

Cycloparaffins (except cyclopentane). Examples: cyclohexane, methyl cyclopentane.

Olefins (except butadiene). Examples: octene, isoprene.

Cycloolefins. Examples: cyclopentadiene, cyclohexene.

B. Aromatic hydrocarbons only as follows: Ethyl benzene, styrene, xylenes.

C. Compounds of the following classes containing only atoms of carbon, hydrogen, and oxygen:

Alcohols (except allyl alcohol, isobutyl alcohol, and propargyl alcohol). Examples of approved alcohols: butyl alcohol, ethylene glycol.

Ethers (except vinyl ethers, glycol ethers, epoxides, and other ringed oxide compounds such as ketenes, furans, and pyrans). Examples of approved ethers: butyl ether, isopropyl ether.

Esters (except acrylates, methacrylates, allyl acetate, vinyl acetate, isopropyl formate). Examples of approved esters: ethyl acetate, butyl formate, methyl propionate.

Ketones (except allyl acetone, methyl ethyl ketone, methyl normal butyl ketone, acetophenone, and vinyl ketones). Examples of approved ketones: acetone, hexanone.

D. Additional chemicals:

Crude oil and refinery petroleum fractions (except pyrolysis naphthas and pyrolysis gasolines) containing less than 10% benzene. Examples of approved petroleum fractions: intermediate and finished gasolines, naphthas, alkylates, fluid catalytic cracking unit feed, fuel oils, distillates, other liquid fuels, and condensates.

Natural gas and crude oil condensates that do not emit sour gas.

* NOTE: Other chemicals not specifically included within the classes defined above are not approved. Examples of non-approved chemicals: aromatics (other than those listed or those found in the crude oil and refinery liquids as listed); aldehydes; amines; amides; imines; nitriles; halogenated compounds; sulfonated chemicals; cyanates; organic acids; ethylene oxide (EtO), propylene oxide, and other oxygenated compounds not listed; organometallic compounds; pesticides.

87. Heat cleaning devices (such as ovens, furnaces, and/or direct flame incinerators) used to thermally remove residual combustible or semi-combustible materials from noncombustible electrical or mechanical parts, provided the following conditions are satisfied:

(a) Before construction begins, the facility shall be registered with the appropriate regional office using Form PI-7.

(b) The combustible material shall not exceed 10% by weight of the total load to the oven, furnace, and/or incinerator.

(c) The combustible material shall contain no halogenated organic compounds.

(d) The oven, furnace, and/or incinerator shall be equipped with an afterburner automatically controlled to operate with a minimum temperature of 1,400 degrees Fahrenheit and a gas retention time of 0.5 second or greater.

(e) Opacity of emissions from the oven, furnace, and/or incinerator shall not exceed 5.0% averaged over a five-minute period.

(f) Manufacturer's recommended operating instructions shall be posted at each oven, furnace, and/or incinerator; and each unit shall be operated in accordance with these instructions.

(g) Heat shall be provided by the combustion of sweet natural gas, liquid petroleum gas, or Number 2 fuel oil with no more than 0.5% sulfur by weight; or by electric power.

(h) The emission of any air contaminant shall not exceed 0.5 pounds per hour and 2.0 tons per year.

88. Direct flame incinerators installed for the purpose of reducing or eliminating non-halogenated volatile organic compound vapors and/or aerosols (but not liquids or solids), provided the following conditions are satisfied:

(a) Before construction begins, the facility shall be registered with the appropriate regional office using Form PI-7.

(b) Each direct flame incinerator shall be automatically controlled to maintain a minimum temperature of 1,400 degrees Fahrenheit in the combustion chamber (secondary chamber if dual chambered) and a gas retention time of 0.5 second or greater.

(c) Continuous temperature monitors to record the temperature of the combustion chamber (secondary chamber if dual chambered) shall be installed and maintained. Temperature data shall be maintained on a rolling two-year retention basis and shall be made available at the request of personnel from the TACB or any local air pollution control program having jurisdiction.

(d) Manufacturer's recommended operating instructions shall be posted at each incinerator and each unit shall be operated in accordance with these instructions.

(e) Opacity of emissions from the incinerator shall not exceed 5.0% averaged over a five-minute period.

(f) There shall be no obstructions to stack flow, such as by rain caps, unless such devices are designed to automatically open when the incinerator is in operation. Properly installed and maintained spark arrestors are not considered obstructions.

(g) Heat for the incinerator shall be provided by the combustion of sweet natural gas, liquid petroleum gas, or Number 2 fuel oil with no more than 0.5% sulfur by weight or by electric power.

(h) The gases being incinerated shall contain no halogenated organic compounds.

(i) This standard exemption shall not apply to catalytic incinerators, or direct flame incinerators installed to control emissions from new or modified facilities subject to the requirements of 31 TAC Chapter 116.

89. Ethylene oxide (EO) sterilizing chambers/operations provided that the following conditions are satisfied:

(a) The manufacturer's maximum rated charge of EtO to each sterilizing chamber shall not exceed 1.4 pounds per cycle. Any combination of sterilizers located on the same or contiguous property shall not emit a total of more than 2,000 pounds of EtO per year.

(b) EtO is used alone or in combination with diluent gases such as CO2, nitrogen and chlorofluorocarbons. Other gases used with the Eto as diluents shall have L values (as listed or referenced in Table 118A of Standard Exemption 118) equal to or higher than the L value for EtO.

(c) At least 95% of the EtO charged per cycle shall be collected into a vent and handled as defined in either (1) or (2) as follows:

(1) The discharge shall be vented to a dedicated, non-return exhaust stack which satisfies all of the following conditions:

(A) The height shall be no less than 30 feet above grade.

(B) The height shall be no less than 15 feet above the peak height of any building or obstruction located within a 450 foot radius of the stack.

(C) The sterilizer stack shall be uncapped and shall exhaust vertically.

(D) The sterilizer vent stack(s) shall be at least 25 feet form any air conditioner intake, air duct, or patient/visitor access area.

(E) The sterilizer exhaust stack parameters for (1) shall be as follows:

Maximum EtO Charge Rate (Pounds) Minimum Stack Flow Rate (Cubic ft/min) Minimum Stack Exit Velocity (ft/sec) Maximum Chamber Size (Cubic feet)
0.4 or less 1000 33.3 9.0 or less
greater than 0.4 and less than 1.4 3000 66.6 less than 70.0

(2) For all other units the sterilizer chamber exhaust shall be vented through an emission control device (ECD) which will continuously achieve a minimum EtO removal efficiency of 99%. Thermal incineration shall not be used to control sterilizer exhaust emission if chlorofluorocarbons are used as a diluent. Within 60 days of notification by the regional office of the TACB the ECD performance must be verified through stack testing or other TACB approved test methods or procedures. The stack parameters must comply with Good Engineering Practice.

(d) Each EtO sterilizer shall be equipped with an automatic control system that will shut down operations in the event an exhaust blower or ECD fails.

(e) Each EtO sterilizer shall be designed to eliminate fugitive losses to the sewer system by utilizing recirculating water with liquid seal vacuum pump(s) or eliminating the liquid seals.

(f) Sterilizer operations which use or emit less than four pounds of EtO per year shall be exempt from conditions (a) through (e) of this standard exemption.

(g) Any incinerator used to comply with condition (c)(2) of this exemption shall also comply with the conditions of Standard Exemption 88.

(h) Existing facilities which emit more than 100 pounds of EtO per year and can meet the conditions of this exemption, should have the control measures in place not later than November 30, 1993. Existing facilities which emit more than 4 pounds but less than 100 pounds of EtO per year and can meet the conditions of this exemption, should have the control measures in place no later than May 31, 1994. The facility shall be registered with the appropriate regional office using Form PI-7 within 10 days of equipment installation. The registration shall include supporting documentation addressing compliance with the terms of this exemption.

(i) Other sterilants may be used in lieu of EtO provided that final emissions meet conditions (c) and (d) of Standard Exemption 118.

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