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Double-WaMank <br /> Monitoring System Hydrostatic Tank Monitor <br /> Configurations 1. Use antifreeze solution in cold climate Options Reservoir <br /> areas. Concrete <br /> 2.Use hallow sphere kit control evapo- Traffic Liquid Level Sensor <br /> Pad Stable Reservoir <br /> ration in arid environments. Liquid Level <br /> 3. Maximum tank burial depth 7'below <br /> grade from tank top. <br /> 4.The monitoring cavity must be vented + . , ,q},rt d <br /> Store <br /> to the atmosphere.The optional reser- -J�' StoreProdud <br /> voir sensor supplied by O/C Tanks isM'�K <br /> designed to automatically vent the <br /> monitoring cavity. <br /> Double War <br /> `Underground Tarek <br /> 11,11. <br /> Liquid Sensor Monitoring Systems F,•M .. <br /> (Dry Annular Space): Concrete <br /> Typical configuration for an electronic Pad Riser Pipe <br /> sensor or manual dipstick. <br /> Note: Fiberglas° <br /> Hydrostatic Tank Monitor 1•Monitoring cavity can be vented to Reservoir <br /> O/C TANKS recommends atmosphere or sealed. <br /> the Hydrostatic Tank Monitor <br /> versus other methods because <br /> of its superior leak detection <br /> capability(see performance , <br /> comparison on the next page). DryAnnular <br /> Space Liquid <br /> Alternate Tank Monitoring Sensing Probe <br /> Systems <br /> The Fiberglas double-wall <br /> tank is designed to accommo- <br /> date other leak monitoring Vacuum and Air Pressure <br /> systems. If another type of Monitoring Systems(Dry Concrete Vacuum or <br /> tank monitor is specified Annular Space): Pad A r Pressure <br /> p Notes: Riser Sensor <br /> initially, the Hydrostatic Mon- 1.Maximum continuous positive air pres. Pipe Fberglas° <br /> itor can still be activated at a sure is 3 psi. Reservoir <br /> future date. 2.Maximum continuous vacuum is <br /> 3"mercury(1S psi maximum).Tank <br /> burial depth restricted to 3 feet <br /> An alternate tank monitoring maximum. <br /> sensor can be located at any <br /> monitoring fitting on the tank <br /> top. However, to provide max- <br /> imum future flexibility, locating <br /> the tank sensor through the <br /> fitting in the Fiberglas Reser- <br /> voir will permit the tank owner <br /> to more economically retrofit the Gasoline Vapor Sensor <br /> tank to activate the Hydrostatic Monitoring Systems(Dry <br /> Tank Monitor for future use. Annular space): Concrete Riser Pipe <br /> Many vapor sensors also include a water Pad <br /> sensor. Fiberglas° <br /> The space between inner and Note: Reservoir <br /> outer tank wall is 1-1/8" for 1. Monitoring cavity can be sealed or Hydrocarbon <br /> vented to atmosphere. Vapor <br /> tanks 12,000 gallon capacity sensor <br /> and less; the cavity space is aka, <br /> 1-3/4" for tanks 15,000 gallon t z <br /> `,oxo •";.: <br /> capacity and larger. <br /> As an optional accessory, O/C Water Sensor <br /> TANKS can provide a factory <br /> installed "drawstring" at the <br /> reservoir monitor fitting, to <br /> assist in positioning liquid <br /> sensors at the bottom of the <br /> annular space. <br /> 12 <br />