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Outdated Standard Exemptions 90 - 97, January 8, 1980

Outdated Title 30 TAC 116 Standard Exemptions organized by exemption number and date.

Exemption

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

90 | 91 | 92 | 93 | 94 | 95 | 96 | 97

90. Revisions to pilot plants built prior to March 5, 1972 and revisions to pilot plants which were exempt from permit requirements when originally built, provided that operation of the revised facility will satisfy the following conditions:

1. The facility will operate for the purpose of:

a. Testing the manufacture or market potential of a proposed product, or
b. Defining the design of a larger plant, or
c. Studying the behavior of an existing plant through modeling in the pilot plant.

91. Any wet sand and gravel plant that obtains its material from subterranean and subaqueous beds where the deposits of sand and gravel are consolidated granular materials resulting from natural disintegration of rock and stone and whose plant production rate is 500 tons/hr or less. All permanent in-plant roads shall be paved. Alternate methods of control may be approved by the Executive Director prior to installation of the facility.

92. Wet batch or central mix concrete batch plants with a production rate 30 yd 3/hr or less that operate in accordance with the following conditions:

  2. A bag filter with a maximum filtering velocity of 5 ft/min is installed on the cement silo. This filter must be in good condition and operating properly during plant operations.
  4. All permanent in-plant roads shall be paved. Alternate methods of control may be approved by the Executive Director prior to installation of the facility.
  6. Before construction of the facility begins, written site approval is received from the Executive Director of the Texas Air Control Board.
  8. Before construction begins the facility must be registered with Form PI-6.

93. REMOVED

94. Hydrochloric (muriatic) acid storage tanks used exclusively for the storage of a 20% solution of hydrochloric acid or less. If more concentrated acid is stored, the tank vent must be scrubbed by a limestone, caustic or water scrubber.

95. Iron sponge gas treating units processing streams containing less than 20 grains of hydrogen sulfide per 100 standard cubic foot at a rate less than 50,000,000 standard cubic feet per day provided that:

  2. The plant is located at least 1/4 mile from any public building, public recreational area or any residence not owned and occupied by the company proposing to install the gas treating units.
  4. During replacement of the iron oxide impregnated chips, the unit is isolated from the main system and pressure is reduced to 0.5 psig or less through a gas fired flare.
  6. The spent iron oxide chips being replaced are promptly disposed of to avoid spontaneous ignition and to prevent an odor nuisance.

96. Any elevated, vertical smokeless flare system designed to be used only as an emergency relief system provided that:

  2. There shall be no visible emissions from the flare for more than five (5) minutes in any two (2) hour period except as provided by the General Rules.
  4. The flare is equipped with a continuously burning pilot light plus either an automatic reignition system or an automatic alarm or other system that provides immediate notification of appropriate supervisory personnel that the flare pilot has gone out.
  6. The flare height is at least 50 feet.
  8. The flare burns vent gases containing only carbon, hydrogen, nitrogen, oxygen, sulfur, chlorine or compounds derived from these elements.
  10. The maximum instantaneous emission of sulfur dioxide will be no more than 800 pounds per hour and the maximum instantaneous emission of chlorine containing compounds (calculated as chlorine) is 38 pounds per hour.
  12. There is normally no flow of process waste to the flare. The flare is used only during an emergency.
  14. The heat release of the flare shall be greater than or equal to the following values for flares emitting sulfur dioxide and/or chlorine containing compounds:
Chlorine

Q = 2.73 x 10 5 (BTU/hr)/(lb/hr) x E Cl2

SO

Q = 0.129 x 10 5 (BTU/hr)/(lb/hr) x E SO2

Where Q=required heat release, BTU/hr
E SO2=SO 2 emission, lb/hr
E Cl2=Chlorine emission, lb/hr

97. Any elevated, vertical, smokeless process flare system provided that:

  2. There shall be no visible emissions from the flare for more than five (5) minutes in any two (2) hour period except as provided by the General Rules.
  4. The flare is equipped with a continuously burning pilot light plus either an automatic reignition system or automatic alarm or other system that provides immediate notification of appropriate supervisory personnel that the flare pilot has gone out.
  6. The flare burns waste gases containing only carbon, hydrogen, oxygen or compounds derived from these elements.
  8. The height of the flare is at least 25 feet.


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