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Outdated Standard Exemptions 81-89, April 25, 1986

Outdated Title 30 TAC 116 Standard Exemptions organized by exemption number and date.


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

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

81. Reserved

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 the General Rules 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 Btu 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 facility or the owner of the property upon which the facility is located.

85. All aqueous fertilizer storage tanks.

86. Any fixed roof 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 eleven (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 roof 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 control 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 API 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 coned 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 EPA Publication AP-42. This document maybe obtained from the Superintendent of Documents, Washington, D.C. 20402. It is Stock No. 0550000251-7, Volume I.
(g) Before construction begins, storage tanks of 25,000 gallons capacity or greater and located in a designated non-attainment 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 one percent 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 No. 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. Reserved

88. Reserved

89. Reserved

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