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Virginia Administrative Code
Title 9. Environment
Agency 5. State Air Pollution Control Board
Chapter 40. Existing Stationary Sources
10/30/2020

9VAC5-40-460. Control Technology Guidelines.

A. Reactors, distillation operations, crystallizers, centrifuges and vacuum dryers. The control system should consist of one of the following:

1. Surface condensation system with an outlet temperature not greater than:

a. -13°F when condensing volatile organic compounds of vapor pressure greater than 5.8 psi;

b. 5°F when condensing volatile organic compounds of vapor pressure greater than 2.9 psi;

c. 32°F when condensing volatile organic compounds of vapor pressure greater than 1.5 psi;

d. 50°F when condensing volatile organic compounds of vapor pressure greater than 1.0 psi; or

e. 77°F when condensing volatile organic compounds of vapor pressure greater than 0.5 psi.

2. Any system of equal or greater control efficiency when compared to the standard in 9VAC5-40-450 A 1, provided such system is approved by the board.

B. Air dryers and production equipment exhaust systems. The control system should consist of one of the following:

1. Condensation system.

2. Wet scrubbing system.

3. Carbon adsorption system.

4. Incineration.

5. Any system of equal or greater control efficiency when compared to the standard in 9VAC5-40-450 B 1, provided such system is approved by the board.

C. Filling of storage tanks. The tank should be a pressure tank maintaining working pressure sufficient at all times to prevent vapor loss to the atmosphere, or be designed and equipped with one of the following vapor control systems:

1. A submerged fill pipe.

2. A vapor control system with the vapor recovery portion consisting of one of the following:

a. A vapor tight return line from the storage container to the tank truck which shall be connected before liquids are transferred into the container.

b. Any adsorption system or condensation system.

3. A vapor control system with the vapor balance portion meeting the following criteria:

a. There should be no leaks in the tank trucks' pressure vacuum relief valves and hatch covers, nor truck tanks, storage tanks and associated vapor return lines during loading or unloading operations.

b. The pressure relief valves on storage containers and tank trucks should be set to release at no less than 0.7 psi or the highest possible pressure in accordance with the following National Fire Prevention Association Standards: "Standard for Tank Vehicles for Flammable and Combustible Liquids," "Flammable and Combustible Liquids Code, "Code for Motor Fuel Dispensing Facilities and Repair Garages" (see 9VAC5-20-21).

c. Pressure in the vapor collection lines should not exceed tank truck pressure relief valve settings.

d. All loading and vapor lines should be equipped with fittings which make vapor tight connections and which close when disconnected.

4. Any system of equal or greater control efficiency when compared to the standard in 9VAC5-40-450 C 1, provided such system is approved by the board.

D. Volatile organic compound storage.

1. The tank should be a pressure tank maintaining working pressure sufficient at all times to prevent vapor loss to the atmosphere, or be designed and equipped with one of the following vapor control systems:

a. Use of pressure/vacuum conservation vent set at + or %68 .030 psi.

b. Vent condensation system.

c. Carbon adsorption system.

d. An internal floating roof resting on the surface of the liquid contents and equipped with a closure seal, or seals, to close the space between the roof edge and tank shell. All tank gauging and sampling devices should be vapor tight except when gauging or sampling is taking place.

e. Any system of equal or greater control efficiency when compared to the standard in 9VAC5-40-450 D 1, provided such system is approved by the board.

2. There should be no visible holes, tears or other openings in the seal or any seal fabric.

3. All openings, except stub drains, should be equipped with a cover, seal or lid. The cover, seal or lid should be in a closed position at all times except when the device is in actual use. Automatic bleeder vents should be closed at all times except when the roof is floated off or landed on the roof leg supports. Rim vents, if provided, should be set to open when the roof is being floated off the roof leg supports or at the manufacturer's recommended setting.

4. The exterior aboveground surfaces (exposed to sunlight) should be painted white, light pastels or light metallic and such exterior paint should be periodically maintained in good condition. Repainting may be performed during normal maintenance periods.

E. General.

1. All centrifuges containing volatile organic compounds, rotary vacuum filters processing liquids containing volatile organic compounds and any other filters having an exposed liquid surface where the liquid contains volatile organic compounds should be enclosed. This applies to liquids exerting a total volatile organic compound vapor pressure of 0.5 psi or more at 68°F.

2. All in-process tanks should have covers. Covers should be closed when possible.

3. For liquids containing volatile organic compounds, all leaks in which liquids can be observed to be running or dripping from vessels and equipment (for example: pumps, valves, flanges) should be repaired as soon as is practical.

Statutory Authority

§ 10.1-1308 of the Code of Virginia.

Historical Notes

Derived from VR120-04-0504, eff. July 1, 1991; amended, Volume 18, Issue 07, eff. February 1, 2002.

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