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<br /> Hazardous Materials Program Guidance:UST Overfill Prevention-Page 7 of 7 NOV 0 5 2018
<br /> L HEALTH
<br /> Xerxes Double-Wall Stand-Alone USTs Manufactured Before 9/1/2008: E MENTA
<br /> Size Diameter Actual Actual 90%Volume 90%Height 95%Volume 95%Height
<br /> (Gallons) (Feet) Capacity Diameter (Gallons) (Inches) (Gallons) (Inches)
<br /> (Gallons) (Inches)
<br /> 6,000 6 5,829 70.25 5,246 58.8 5,538 63.1
<br /> 6,000 8 5,998 89.75 5,398 74.6 5,698 80.1
<br /> 6,000 10 6,430 118.25 5,787 97.0 6,109 104.3
<br /> 8,000 8 7,841 89.75 7,057 74.8 7,449 80.3
<br /> 8,000 10 8,005 118.00 7,205 97.5 7,605 104.8
<br /> 10,000 8 9,684 89.75 8,716 74.9 9,200 80.4
<br /> 10,000 10 10,369 117.75 9,332 97.5 9,851 104.7
<br /> 12,000 8 11,527 89.75 10,374 75.1 10,951 80.5
<br /> 12,000 10 11,849 117.75 10,664 97.7 11,257 104.9
<br /> 20,000 10 19,703 117.75 17,733 98.3 18,718 105.4
<br /> 30,000 10 30,063 1 118.25 27,057 99.1 1 28,560 106.2
<br /> 40,000 10 1 40,304 1 118.25 36,274 99.2 38,289 106.3
<br /> Xerxes Double-Wall Compartmented USTs Manufactured Before 9/1/2008:
<br /> Size Diameter Actual Actual 90% 90%Height 95% 95%Height
<br /> Tank Capacity Diameter Volume Volume
<br /> (Gallons) (Feet) (Gallons) (Inches) (Gallons) (Inches) (Gallons) (Inches)
<br /> Base Tank 12K/8K 8 11,527 89.75 10,374 75.1 10,951 80.5
<br /> End Tank 12K/8K 8 7,917 90.25 7,125 76.1 7,521 81.4
<br /> Base Tank 12K/8K 10 11,849 117.75 10,664 97.7 11,257 104.9
<br /> End Tank 12K/8K 10 7,817 118.125 7,035 99.6 7,426 106.6
<br /> H. Additional Ball Float Issues [Excerpts from SWRCB Local Guidance(LG)Letter LG-150-2]
<br /> ➢ Ball float valves should not be used with suction piping systems or pressure delivery systems. During a
<br /> product drop, as the tank fills, the ball seat restricts the flow of vapor back to the transport truck or
<br /> through the tank vent.Vapors can no longer escape and are compressed inside the tank. If a ball float is
<br /> used in conjunction with a suction piping system, the increased pressure in the tank can push product
<br /> out through the air eliminator at the dispenser, causing a spill at the fuel island. Additionally, when ball
<br /> float valves are used in conjunction with pressure delivery systems, fuel delivery could over pressurize
<br /> and/or overfill the tank.
<br /> ➢ When using ball float valves, a valve should be installed at each tank top opening from which the tank
<br /> could vent during delivery. Ball float vent valves protrude into underground storage tanks from the Stage
<br /> I vapor return riser pipe. As the tank becomes full during a product drop, the ball seat restricts the flow
<br /> of vapors back to the transport truck or through the tank vent.Vapors cannot escape from the tank,and
<br /> are instead compressed in the remaining ullage space. As the vapors are compressed, product flow into
<br /> the tank is severely restricted. If all tank vent openings are not restricted, vapors can exit the tank and
<br /> product flow will not be restricted.
<br /> ➢ When using a combination of ball float valves and flapper valves, the flapper valve should be set below
<br /> the level of the ball float valves. If the ball float valve is installed below the flapper valve, it may interfere
<br /> with the normal operation of the flapper valve.[Note:A certain amount of flow is necessary to cause the
<br /> flapper to shut properly. Back pressure in the tank from a flow restrictor might cause the product delivery
<br /> flow rate to drop below that level.]
<br /> HMPG-025 7/7-Rev.09/20/18
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