Clicking on a highlighted number below
links you to the standard exemption.
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 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
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
(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
(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
(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
(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
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
(b) The true vapor pressure of the
compound to be stored is less than 11.0 psia at the maximum storage
(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
(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
(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.
(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
are not covered by this
Approved Chemical List for Standard
A. Compounds of the following classes
containing only atoms of carbon and hydrogen, not including
- Paraffins. Examples: hexane, pentane, octane, isooctane.
- Cycloparaffins (except cyclopentane). Examples: cyclohexane,
- 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
- 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
* 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
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,
(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
(h) The emission of any air
contaminant shall not exceed 0.5 pounds per hour and 2.0 tons per
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
(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 Texas Air Control Board 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
(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
(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. All ethylene oxide sterilizing
chambers, provided that all the following conditions are
(a) The sterilizing chamber shall be
located within a direct health care facility such as a hospital or
(b) Each sterilizing chamber shall be
limited to a charge of no more than 4 pounds of ethylene
(c) Only one sterilizing chamber
shall be vented at a time and the venting period shall be
controlled and shall require at least 15 minutes to complete.
(d) At least 95 percent of the
charged ethylene oxide shall be captured and routed through a
scrubber that is operated with a minimum of 99 percent efficiency
in removal of the ethylene oxide. It shall not be permissible under
any circumstances to vent a chamber directly to the
(e) The scrubber stack and all
ventilation air vents form the room in which a sterilizer is
located or in which sterilized products are stored shall exhaust to
the atmosphere at a height not less than 30 feet above ground level
and not less than 15 feet above the peak of the building.
(f) The facility shall be registered
using Form PI-7 with the appropriate Regional Office prior to
installation of the equipment. Supporting documentation shall
include the quantities of ethylene oxide used, operating procedures
and the scrubber design information.
Questions? We Can Help
If you have questions contact us.