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DOUBLE WALL TANK MONITORING <br />Because of its superior leak detection capability, Con- <br />tainment Solutions recommends the Hydrostatic Tank <br />Monitor for continuous monitoring of the annular space. <br />However, the tank owner and/or operator is responsible <br />for selection of the monitoring system. <br />B1. ALTERNATE TANK MONITORING <br />SYSTEMS <br />♦ A variety of leak monitoring systems can be used with <br />Containment Solutions double-wall tanks. <br />♦ Alternate tank monitoring sensor must be located at <br />the monitoring fitting on top of tank. <br />RESTRICTIONS ON MONITORING CAPABILITIES <br />♦ For liquid sensors and gasoline vapor sensors: <br />❑ Cavity between the inner and outer tank may be <br />either vented to the atmosphere or sealed. <br />♦ For Hydrostatic Tank Monitor: <br />CAUTION <br />Monitoring cavity between the inner and outer tank <br />must be vented to the atmosphere. If unvented, pres- <br />sure buildup can cause tank damage. <br />❑ Tank burial depth must not exceed T from tank top <br />to finish grade. <br />❑ Vent annular Space <br />❑ Optional reservoir sensor (supplied by Containment <br />Solutions) senses liquid level in reservoir and vented <br />riser pipe cape automatically vents monitoring cav- <br />ity. <br />♦ For Vacuum Monitoring: <br />❑ Maximum vacuum is 5 psi. <br />♦ For Positive Air Pressure Monitoring: <br />Maximum air pressure is 5 psi. <br />B2. 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 be <br />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 />NOTE: For ease of installation insert the sensor in the <br />tank cavity before installing the monitoring riser pipe <br />to grade. <br />Containment Solutions recommends a minimum 4" <br />riser to grade for easier removal or replacement of <br />sensor. <br />Tank <br />Diameter <br />Clearance Between <br />Inner and Outer Tanks <br />4" <br />ill <br />10' <br />1 112" <br />FIGURE 26 <br />Low <br />Install Liquid or Vapor End of <br />Sensors Here Tante <br />a <br />4'Annular Space Fitting <br />Optional Z' Liquid or Vapor Sensors <br />Flope Max. <br />Tank Model Double Wall Only <br />B3. INSTALLATION OF VACUUM OR AIR <br />PRESSURE MONITORING SYSTEMS <br />♦ Consult monitoring equipment manufacturer for proper <br />installation. <br />B4. INSTALLATION OF HYDROSTATIC TANK <br />MONITOR <br />♦ Consult Section C for detailed installation instructions. <br />17 <br />