PLACER COUNTY AIR POLLUTION CONTROL DISTRICT

RULE 212 - STORAGE OF ORGANIC LIQUIDS
(Adopted 5-24-77; Amended 6-19-79, 9-25-90, 10-19-93, 11-03-94, 6-08-95, 6-19-97)

100 GENERAL
 

101 PURPOSE: To limit emissions from storage tanks for organic liquids.
 

102 APPLICABILITY:

 

200 DEFINITIONS
 

201 EFFICIENCY: A comparison of controlled emissions to those uncontrolled emissions which would occur from a fixed or cone roof tank in the same product service without a vapor control system. Baseline emissions shall be calculated using the criteria in API Bulletin 2518.
 

202 EXEMPT COMPOUNDS: Exempt Compounds are defined in Rule 102, Definitions.
 

203 EXTERNAL FLOATING ROOF: A vapor loss control device, consisting of a pontoon-type or double-deck-type cover that rests on the surface of the liquid contents and which is equipped with an approved closure device between the tank shell and roof edge.
 

204 INTERNAL FLOATING ROOF: A vapor loss control device consisting of a fixed roof with an internal-floating-type cover which prevents the release or emission to the atmosphere of organic vapors or gases at an efficiency equivalent to an approved external floating roof closure device.
 

205 METALLIC-SHOE-SEAL: A type of seal used to minimize evaporative losses of organic liquids from a storage tank equipped with an external floating roof. It serves a primary seal, and is constructed with vertical metal plates or "shoes", connected by braces or other devices to the circumference of the floating roof. They are partially immersed in the liquid being stored, and are suspended in such a way that they are forced outward against the inner tank wall.
 

206 ORGANIC LIQUID: Any volatile organic compound which contains hydrogen and which would exist as a liquid at actual conditions of use or storage.
 

207 PRESSURE TANK: A closed storage tank designed and constructed to (1) operate at internal pressures above one atmosphere, (2) be able to withstand the vapor pressure of the stored liquid under all storage conditions and (3) prevent at all times the loss of such material or its vapor to the atmosphere.
 

208 RESILIENT-TOROID-SEAL: A type of seal used to minimize evaporative losses of organic liquids from a storage tank equipped with an external floating roof. It is a toroidal tube, or "donut", made of fabric or other resilient material, that rests on the surface of the stored liquid. It serves as primary seal that minimizes evaporative losses from the tank. The toroid seal may be filled with air, foam, or other resilient material.
 

209 STORAGE TANK: Any stationary container, reservoir, or tank used for the storage of organic liquids.
 

210 VAPOR PRESSURE: The vapor pressure under actual storage conditions as determined by the test methods specified in Section 502.1.
 

211 VAPOR RECOVERY SYSTEM: A California Air Resources Board (CARB) - certified system that collects organic vapors and gases from a storage tank and either returns them to the tank or otherwise processes them to prevent or reduce emissions to the atmosphere.
 

212 VAPOR TIGHT: A condition when the concentration of total hydrocarbons does not exceed 10,000 ppm (expressed as methane) above background, as determined by EPA Reference Method 21. Background shall be defined as the ambient concentration of organic compounds determined at least three (3) meters upwind of the potential source and not influenced by any specific emissions source.
 

213 VOLATILE ORGANIC COMPOUNDS (VOC): Compounds which contain at least one atom of carbon, except for the Exempt Compounds.
 

300 STANDARDS
 

301 STORAGE TANKS WITH A CAPACITY GREATER THAN 40,000 GALLONS: A person shall not store any organic liquid having a vapor pressure greater than 25.8 mm Hg (0.5 psia), in any storage tank with a capacity greater than 40,000 gallons, unless such tank is (1) a pressure tank maintaining working pressures sufficient at all times to prevent organic vapor or gas loss to the atmosphere, or (2) designed and equipped with one of the vapor loss control devices as specified in Sections 306, 307, and 308 of this rule.
 

302 STORAGE TANKS WITH A CAPACITY LESS THAN OR EQUAL TO 40,000 GALLONS: A person shall not store any organic liquid having a vapor pressure greater than 25.8 mm Hg (0.5 psia), in any storage tank with a capacity less than or equal to 40,000 gallons, unless such tank is equipped with one of the following:

 

303 STORAGE TANKS WITH A CAPACITY GREATER THAN 20,000 GALLONS AND LESS THAN OR EQUAL TO 40,000 GALLONS: A person shall not store any organic liquid having a vapor pressure greater than 77.5 mm Hg (1.5 psia) in any storage tank with a capacity greater than 20,000 gallons, but less than or equal to 40,000 gallons, unless such tank is (1) a pressure tank maintaining working pressures sufficient at all times to prevent organic vapor or gas loss to the atmosphere, or (2) designed and equipped with one of the vapor loss control devices as specified in Sections 306 through 313 of this rule.
 

304 ABOVE GROUND STORAGE TANKS WITH A CAPACITY GREATER THAN 10,000 GALLONS AND LESS THAN OR EQUAL TO 20,000 GALLONS: A person shall not store any organic liquid having a vapor pressure greater than 77.5 mm Hg (1.5 psia) in any above ground storage tank with a capacity greater than 10,000 gallons, but less than or equal to 20,000 gallons capacity, unless such tank is (1) equipped with a pressure-vacuum valve which is set to operate at a pressure within 10% of the maximum allowable working pressure of the tank, or at a pressure of at least 25.8 mm Hg (0.5 psia), or (2) equipped with a vapor loss control device as specified in Sections 306 through 313 of this rule.
 

305 ANY STORAGE TANK CONTAINING ORGANIC LIQUIDS WITH A VAPOR PRESSURE GREATER THAN 569 mm Hg (11 psia): A person shall not store organic liquid with a vapor pressure greater than 569 mm Hg (11 psia) in any storage tank unless such tank is (1) a pressure tank maintaining working pressures sufficient at all times to prevent organic vapor or gas loss to the atmosphere, or (2) designed and equipped with a vapor recovery system which meets the requirements of Section 308 of this rule.
 

306 EXTERNAL FLOATING ROOF: This vapor loss control device, as defined in Section 203, shall be equipped with a closure device that consists of two seals, one above the other; the one below shall be referred to as the primary seal and the one above shall be referred to as the secondary seal. Seal designs shall be submitted to the Air Pollution Control Officer and shall not be installed or used unless they are approved by the Air Pollution Control Officer as meeting the criteria set forth within this section and the applicable closure requirements of Sections 309 through 313 of this rule.
 

307 INTERNAL FLOATING ROOF: This vapor loss control device with a fixed external roof, as defined in Section 205, shall prevent the release or emission to the atmosphere of organic vapors or gases at an efficiency equivalent to a floating roof closure device which meets the applicable requirements of Sections 309 through 313 of this rule.
 

308 VAPOR RECOVERY SYSTEM:

 

309 CRITERIA FOR METALLIC-SHOE-SEAL CLOSURES:

 

310 CRITERIA FOR WELDED TANKS WITH METALLIC-SHOE-SEALS: Any welded tank shell which uses a metallic-shoe-type seal shall meet the following conditions:

 

311 CRITERIA FOR RIVETED TANKS WITH METALLIC-SHOE-SEALS: Any riveted tank shell which uses a metallic-shoe-seal shall meet the following conditions:

 

312 CRITERIA FOR RESILIENT-TOROID-SEAL: Any storage tank which uses a resilient-toroid-type seal shall meet the following conditions:

 

313 CRITERIA FOR WELDED TANKS WITH ZERO GAP SECONDARY SEALS: Any welded tank shell which uses a zero gap secondary seal must meet the following conditions:

 

400 ADMINISTRATIVE REQUIREMENTS
 

401 PRIMARY SEAL INSPECTION:

 

500 MONITORING AND RECORDS:
 

501 RECORDKEEPING:

 

502 TEST METHODS