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-3- <br /> 2. The Clean Air Separator shall be installed within 100 feet from the vent line(s), <br /> and the associated piping shall be sloped 1/8" per foot minimum toward the vent <br /> line(s). <br /> Pressure/Vacuum Vent Valves for Gasoline Storage Tank Vents <br /> 1. All PN vent valves shall be an ARB-certified PN vent valve for a Phase I system. <br /> 2. At least one pressure/vacuum (PN) vent valve shall be installed on each <br /> gasoline storage tank vent. The maximum number of PN vent valves allowed <br /> and PN vent valve performance specifications are listed in the applicable Phase <br /> I EVR Executive Order. Vent lines may be manifold to minimize the number of <br /> PN vent valves and potential leak sources, provided the manifold conforms to all <br /> applicable fire regulations. At least one PN vent valve shall be installed on vents <br /> if a manifold is incorporated. Figure 2113-3 or 213-3H shows a typical manifold <br /> configuration for a single PN vent valve with the Clean Air Separator. If two or <br /> more PN vent valves are desired, they shall be installed in parallel, so that each <br /> can serve as a backup to the other if one should fail to open properly. Figure <br /> 2113-4 or 21134H shows a typical manifold configuration for two PN vent valves <br /> installed in parallel with the Clean Air Separator. Figure 2113-5 or 2B-5H shows <br /> a typical manifold configuration for three PN vent valves installed in parallel with <br /> the Clean Air Separator. Figure 213-6 or 2B-6H shows a typical configuration for <br /> a PN vent valve mounted on a single 3" vent line with the Clean Air Separator. <br /> Figures 213-3, 213-4, 2B-5 and 213-6 apply to vertical CAS installations. Figures , <br /> 2B-3H, 2134H, 2B-5H and 2B-6H apply to horizontal CAS installations. <br /> Vapor Recovery Piping Configurations <br /> NOTE: Vapor Return Piping shall meet the requirements specified in <br /> section 4.11 of CP-201. <br /> 1. Vapor Return and Vent Lines <br /> a. For facilities installed on or afterApril 1, 2003, all vapor return and vent <br /> lines shall be a minimum nominal internal diameter of 2 inches from the <br /> dispensers or the vent stacks to the first manifold. All lines after the first <br /> manifold and back to the underground storage tank shall have a minimum <br /> nominal internal diameter of 3 inches. <br /> Note: Facilities permitted by a local district prior to April 1, 2003 shall <br /> be required to meet the three inch diameter standard only upon <br /> facility modification requiring exposing at least 50 percent of the <br /> underground vapor return piping. <br /> Healy Systems, Inc. Phase 11 EVR System, Exhibit 2-VR-201-H <br />