Outdated Standard Exemptions 81 - 89, April 5, 1995
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 Texas Natural Resource Conservation Commission Office of Air Quality in Austin 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 Texas Natural Resource Conservation Commission Office of Air Quality in Austin 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.
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 Texas Natural Resource Conservation Commission Office of Air Quality in Austin 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 1,400degrees 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 Texas Natural Resource Conservation Commission (TNRCC) Office of Air Quality in Austin 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 TNRCC 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 30 TAC Chapter 116.
89. Ethylene oxide (EO) sterilizing chambers/operations provided that the following conditions are satisfied:
(a) All sterilizers must meet the following conditions:
(1) EO shall only be handled by medical professionals or appropriately trained personnel in medical and industrial use areas.
(2) Written records shall be maintained for a minimum of two years and shall be made available to representatives of the Texas Natural Resource Conservation Commission (TNRCC) upon request. Records shall include:
(A) Documentation of the date and time of each sterilizer operation cycle.
(B) The total pounds of EO purchased and used per calendar year listed as monthly totals.
(C) Leak test results.
(3) Leak tests of each sterilizer system shall be performed at least every six months. Results of the tests shall be made available to the TNRCC upon request.
(4) EO shall only be used alone or in combination with carbon dioxide, nitrogen, chlorofluorocarbon, hydrochlorofluorocarbon diluent gases, or other mixtures as approved by the Executive Director.
(5) The sterilizer vent system exhaust stack shall meet the following conditions:
(A) The stack shall be uncapped and exhaust vertically upward.
(B) The stack height shall be extended to at least 15 feet above the roof line of the building; and the stack tip shall be located at least 25 feet from any opening to the building interior, such as fresh air intake, unsealed windows, or pedestrian traffic areas. Stacks on multi-level roofs must only extend 15 feet above the roof upon which the stack is located.
(C) Stack exit velocity shall be at least 50 feet per second.
(b) The following conditions apply only to sterilizers that use less than 100 pounds of EO per year:
(1) Sterilizer systems which vent entirely to atmosphere shall not exceed 0.5 pounds of EO used per cycle. Sterilizer systems which use nonrecirculating, water sealed vacuum systems shall not exceed two pounds of EO charged per cycle. For facilities with multiple sterilizers, the usage rate is based on total EO usage at any given time.
(2) Any combination of sterilizers located on the same or contiguous property under common ownership shall not exceed a total EO usage of less than 100 pounds per year.
(c) The following conditions apply only to sterilizers that use between 100 and 1,000 pounds of EO per year:
(1) Before construction begins, the facility shall be registered with the TNRCC Office of Air Quality in Austin using Form PI-7.
(2) The sterilizer chamber exhaust shall vent through an emission control device that will continuously achieve a minimum EO removal efficiency of 99%. Thermal incineration shall not be used to control sterilizer exhaust emissions if chlorofluorocarbons are used as a diluent. Within 60 days of start-up, the control device performance must be verified through stack testing or other TNRCC approved test methods or procedures.
(3) There shall be no discharge of water containing dissolved EO through a sanitary sewer system.
(4) Any combination of sterilizers located on the same or contiguous property under common ownership shall be limited to a total EO usage of 1,000 pounds per year.
(5) Existing facilities which emit 100 or more pounds per year
and can meet the conditions of this exemption, shall have the
control measures in place no later than March 1, 1994.
Questions? We Can Help
If you have questions contact us.