REMOVAL_1998 - Laserfiche WebLink

Home Browse Search

' Executive Order G-70-164,Exhibit 2 page 6 properly. The PN valve shall be CARB-certified as specified in Exhibit 1, and shall be installed so as to ensure that any venting from the system will occur only when the PN valve settings are exceeded. The outlets shall vent upward and be located to eliminate the possibility of vapor accumulating or traveling to a source of ignition or entering adjacent buildings. Vapor Recovery Piping Configurations 1. All vapor return lines shall slope a minimum of 1/8 inch per foot. A slope of 1/4 inch or more per foot is recommended wherever feasible. 2. The dispenser shall be connected to the riser with either flexible or rigid material which is listed for use with gasoline. The dispenser-to-riser connection shall be installed so that any liquid in the lines will drain toward the storage tank. The internal diameter of the connector, including all fittings, shall not be less than five-eighths inch (5/8"). 3. The nominal inside diameter of the underground vapor and vent lines shall be two inches (2"). The condensate drain line may be a minimum �of one-half (0.5) inches internal diameter. All vapor lines shall allow unobstructed passage of vapor as appropriate in normal operation of the system: The vapor return lines=shall be installed as indicated in the appropriate figures. 4. All vapor return and vent piping shall be, at a minimum; installed in accordance with the manufacturer's instructions and all applicable regulations. Local districts may impose additional.requirements. 5. A tank stick correction gauge.(optional) may be installed at the vent line. Thegaugeshall be installed on the vent line at least six and no more than ten feet (6' - 10') above grade, and shall be installed so that it allows no vapor emissions and so that any condensate will drain away from the gauge. The gauge is shown in Figure 213-7 and reads in inches of gasoline (pressure to the left of zero and vacuum to the right of zero). Piping Configuration Using Out-of Tank Drain Check(Figures 2A=4 and 2A-51 1. The vapor piping shall have a natural drainage of condensate to the underground storage tanks to ensure that the intended path of vapors is not subjected to liquid blockage. Note: Local districts may require the introduction of liquid into vapor lines before conducting air to liquid ratio tests to verify natural drainage. 2. The drain check is designed to be normally flooded with product (Figure 2A-5). Piping Configuration Using a Condensate Trap 1. Vapor piping configurations using a condensate trap is not a recommended configuration. However, there are situations, such as a station's topography, that do not make it feasible nor practical to require the vapor piping to naturally drain to the underground storage tanks. The District shall explore all other approved piping configurations prior to approving the use of a condensate trap which is self-evacuating, vapor tight and accessible for inspection. If a district elects to allow a condensate trap which is not self evacuating, the district may