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DOUBLE-WALL TANK MONITORING SYSTEM CONFIGURATIONS <br /> 1. Use antifreeze solution in cold � <br /> Hydrostatic Tank Monitor: climate areas. concrete <br /> Optional Reservoir <br /> Owens-Corning recommends the 2. Use hollow sphere kit to control Traffic Liquid Level sensor <br /> Hydrostatic Tank Monitor versus other evaporation in arid environments. Pad Fiberglas' <br /> methods because of its superior leak 3. Maximum tank burial depth 7' Reservoir <br /> detection capability(see performance below c ade from tank top. <br /> comparison on the next page). 4. The monitoring cavity must be <br /> vented to the atmosphere. The Prtor� <br /> optional reservoir sensor supplied <br /> by Owens-Corning is designed to <br /> automatically vena the monitoring Double-,mail <br /> cavity. Underground Tank <br /> Liquid Sensor Monitoring Systems <br /> (Dry Annular Space): Concre6Dry <br /> Typical configuration for an electronic <br /> Padiser Pipe <br /> sensor or manual dipstick. iberglas' <br /> Note: eservoir <br /> 1. Monitoring cavity can be vented to <br /> Alternate Tank Monitoring Systems atmosphere or sealed. <br /> The Owens-Corning double-wall tank is <br /> designed to accommodate other leak <br /> monitoring systems. If another type of <br /> tank monitor is specified initially, the <br /> Annular <br /> Hydrostatic Monitor can still be activated Space Liquid <br /> at a future date. sensing Probe <br /> An alternate tank monitoring sensor <br /> can be located at any monitoring fitting <br /> on the tank top. However, to provide <br /> maximum future flexibility, locating the Vacuum and Air Pressure Monitoringtanksensorsensor through the fitting in the Systems(Dry Annular Space): Concrete vacuum or <br /> Fiberglas Reservoir will permit the tank Pad Air Pressure <br /> owner to more economically retrofit the Notes: Riser sensor <br /> tank to activate the Hydrostatic Tank 1. Maximum continuous positive air Pipe Fiberglas' <br /> Monitor for future use. pressure is 3 psi. Reservoir <br /> The space between inner and outer 2. Maximum continuous vacuum is <br /> tank wall is 1-1/8" for tanks 12,000 3" mercury(1Z psi maximum). <br /> gallon capacity and less; the cavity <br /> space is 1-3/4" for tanks 15,000 gallon <br /> capacity and larger. <br /> Gasoline Vapor Sensor Monitoring .: <br /> Systems(Dry Annular Space): Concrete <br /> Many vapor sensors also include a Pad Riser Pipe <br /> water sensor. Fiberglas" <br /> Note: Reservoir <br /> 1. Monitoring cavity can be sealed Vapor rbon <br /> or vented to atmosphere. - Sensor <br /> Water Sensor <br />