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Double Wall Tank Monitoring <br />Because of its superior leak detection capability, Owens- <br />Corning recommends the Hydrostatic Tank Monitor. <br />However, the tank owner and/or operator is responsible for <br />selection of monitoring system. <br />Bl. Alternate Tank Monitoring Systems <br />• A variety of leak monitoring systems can be used <br />with Owens -Coming double-wall tanks. <br />• Alternate tank monitoring sensor must be located at <br />the monitoring fitting on top of tank. <br />4" Monitoring Fitting <br />Fiberglas® Reservoir' <br />& 4" Hydrostatic Monitoring Fitting <br />'Tank Model DWT -Type II Only <br />Restrictions on Monitoring Capabilities <br />(All Owens-Corning double-wall tanks.) <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 />Restrictions on Monitoring Capabilities <br />( Type II Tanks only). <br />• For Hydrostatic Tank Monitor: <br />❑ Tank burial depth must not exceed 7' from tank <br />top to finish grade. <br />❑ Monitoring cavity between the inner and outer tank <br />must be vented to the atmosphere. If unvented, <br />pressure build-up can cause tank damage. <br />❑ Optional reservoir sensor (supplied by Owens -Coming) <br />senses liquid level in reservoir and automatically vents <br />monitoring cavity. <br />• For Vacuum Monitoring: <br />❑ Maximum vacuum is 5 psi. <br />• For Positive Air Pressure Monitoring: <br />❑ Maximum air pressure is 3 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. <br />• Use an electrician's wire puller to position sensor at or <br />near bottom of tank. Most sensors can be installed from <br />finished grade. <br />Important: For ease of installation insert the sensor in <br />the tank cavity before installing the monitoring riser pipe <br />to grade. <br />Install <br />Liquid or Vapor <br />Sensors Here <br />High End 4" Monitoring Fitting Low End <br />of Tank of Tank <br />EFiberglass Reservoir' <br />4" Hydrostatic Monitoring Fitting <br />Optional <br />e Slope <br />Maximum <br />Liquid or Vapor Sensors <br />Tank Model DWT -Type II Only <br />Tank <br />Diameter <br />Clearance Between <br />Inner and Outer Tanks <br />4' <br />1" <br />6' <br />7/g„ <br />8' <br />7/g„ <br />10' <br />11/2" <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 <br />Tank Monitor <br />• See section C for detailed installation instructions. <br />13 <br />