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• -3- • <br /> positions shown in Figure 26-5 for normal Clean Air Separator <br /> operation. A Clean Air Separator that is not in the proper operating <br /> configuration shall be considered a defect. <br /> 2. The Clean Air Separator can be installed up to 100 feet from the vent line(s), <br /> provided that this piping is sloped 1/8" per foot minimum toward the vent line(s). <br /> 3. The Air Breather Assembly for the Clean Air Separator shall be installed at least <br /> twelve feet (12') above grade. <br /> Pressure/Vacuum Vent Valves for Storage Tank Vents <br /> 1. The PN vent valve shall be an ARB-certified valve as specified in Exhibit 1. <br /> 2. At least one pressure/vacuum (PN) vent valve shall be installed on each tank <br /> vent. The maximum number of PN vent valves allowed and PN vent valve <br /> performance specifications are listed in the applicable Phase I EVR Executive <br /> Order. Vent lines may be manifold to minimize the number of PN vent valves <br /> and potential leak sources, provided the manifold conforms to all applicable fire <br /> regulations. At least one PN vent valve shall be installed on vents if a manifold <br /> is incorporated. Figure 2113-6 shows a typical manifold configuration for a single <br /> PN vent valve with the Clean Air Separator. If two or more PN vent valves are <br /> desired, they shall be installed in parallel, so that each can serve as a backup to <br /> the other if one should fail to open properly. Figure 2B-7 shows a typical <br /> manifold configuration for two PN vent valves installed in parallel with the Clean <br /> Air Separator. Figure 2B-8 shows a typical manifold configuration for three PN <br /> vent valves installed in parallel with the Clean Air Separator. Figure 213-9 shows <br /> a typical configuration for a PN vent valve mounted on a single 3" vent line with <br /> the Clean Air Separator. <br /> Vapor Recovery Piping Configurations <br /> NOTE: New facilities and facilities undergoing Phase II maior modifications must <br /> also meet the piping requirements specified in section 4.12 of C13-201. <br /> 1. Vapor Return and Vent Lines <br /> a. For new installations and existing installations undergoing Phase II major <br /> modifications, all vapor return and vent lines shall be a minimum nominal <br /> internal diameter of 2 inches from the dispensers or the vent stacks to the <br /> first manifold. All lines after the first manifold and back to the underground <br /> storage tank shall have a minimum nominal internal diameter of 3 inches. <br /> Prior to and after backfilling the vapor return and vent lines, the maximum <br /> pressure drop shall not exceed 0.5 inches WC at 60 standard cubic feet <br /> per hour as determined by TP-201.4, Dynamic Backpressure. The <br /> pressure drop shall be measured from the dispenser riser to the UST with <br /> Healy Phase 11 EVR System Including Veeder-Root ISD, Exhibit 2—VR-202-A <br />