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Double-Wall Tank M • • <br /> SECTION <br /> DOUBLE WALL TANK MONITORING NOTE: For ease of installation Insert the sensor in <br /> Because of its superior leak detection capability, Con- the tank cavity before installing the monitoring riser <br /> tainment Solutions recommends the Hydrostatic Tank pipe to grade. <br /> Monitor for continuous monitoring of the annular space. Containment Solutions recommends a minimum 4" <br /> However, the tank owner and/or operator is responsible riser to grade for easier removal or replacement of <br /> for selection of the monitoring system. sensor. <br /> 61. ALTERNATE TANK MONITORING Tank Clearance Between <br /> SYSTEMS Diameter Inner and Outer Tanks <br /> • A variety of leak monitoring systems can be used with 4' 1" <br /> Containment Solutions double-wall tanks. 6' 1 <br /> • Alternate tank monitoring sensor must be located at 8 1 <br /> the monitoring fitting on top of tank. 1 10' 1 1/2" <br /> FIGURE 26 <br /> RESTRICTIONS ON MONITORING CAPABILITIES Low <br /> Install Liquid or Vapor <br /> • For liquid sensors and gasoline vapor sensors: Sensors Here End ofrank <br /> ❑ Cavity between the inner and outer tank may be <br /> either vented to the atmosphere or sealed. 4"Annular Space Fitting <br /> • For Hydrostatic Tank Monitor: <br /> A Optional 2" Liquid or Vapor Sensors <br /> Monitoring cavity between the Inner and outer tank Slope Max. <br /> must be vented to the atmosphere. If unvented, pres- Tank Model Double wall Only <br /> sure buildup can cause tank damage. <br /> ❑ Tank burial depth must not exceed 7'from tank top BS. INSTALLATION OF VACUUM OR AIR <br /> to finish grade. PRESSURE MONITORING SYSTEMS <br /> ❑ Vent annular Space • Consult monitoring equipment manufacturer for proper <br /> ❑ Optional reservoir sensor(supplied by Containment installation. <br /> Solutions)senses liquid level in reservoir and vented <br /> riser pipe cape automatically vents monitoring cav- <br /> ity. TANK MONITOR <br /> • For Vacuum Monitoring: • Consult Section C for detailed installation instructions. <br /> ❑ Maximum vacuum is 5 psi. <br /> ♦ For Positive Air Pressure Monitoring: <br /> ❑ Maximum air pressure is 5 psi. <br /> 82. INSTALLATION OF LIQUID OR VAPOR <br /> SENSORS <br /> • Consult monitoring equipment manufacturer for proper <br /> installation. <br /> • When liquid or vapor sensors are used, the tank may <br /> be sloped at time of installation. <br /> • If tank is sloped,place tank so that the lowest elevation <br /> is at monitoring end (see figure 26). <br /> • Use an electrician's wire puller to position sensor at or <br /> near bottom of tank. <br /> 17 <br />