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Double Wall Tank M"itoring <br /> O/C Tanks recommends the Hydrostatic Tank Monitor versus other <br /> methods because of its superior leak detection capability.However,the B2. Installation of Liquid or Vapor <br /> selection of the monitoring system and method is the responsiblhty of tank <br /> owner and/or operator. Sensors <br /> When liquid or vapor sensors are used,the tank may be sloped at time of <br /> B1. Alternate Tank Monitoring Systems installation.If the tank is sloped.place the tank so that the lowest elevation <br /> `- is at the monitoring end. <br /> The O/C Tanks double-wall tank is designed to accommodate a variety of These sensors are normally installed using an electrician's wire puller to <br /> leak monitoring systems.If another type of tank monitor is specified initial- position the sensor at or near the tank bottom.Most sensors can be <br /> ly,the Hydrostatic Tank Monitor can still be activated at a future date. installed from finished grade.However,for ease of Installation,Insert <br /> An alternate tank monitoring sensor can be located at any monitoring fit- the sensor In the tank cavity before installing the monitoring riser <br /> ting on the tank top.However,to provide maximum future flexibility, pipe to grade. <br /> locating the tank sensor through the fitting in the Fiberglas reservoir will <br /> permit the tank owner to more economically retrofit the tank,if he <br /> chooses,to activate the Hydrostatic Tank Monitor in the future. 4-NPTMunkonng Fittings haaallipaid <br /> or vapor <br /> Monitor ganso,,,n, <br /> Monitoring Finings <br /> High <br /> Tank of lank <br /> Optional <br /> 2'Slope <br /> Maximum <br /> Fiberglas®Reservoir' LIquW orvapor Sensors <br /> The space between the inner and outer tank wall is 1 try"for tanks 12,000 <br /> gallon capacity and less:the cavity space is 13/4"for tanks 15,000 gallon <br /> capacity and larger, <br /> 'Tank motlels DWT 2P ana DWT-$Pony <br /> Consult monitoring equipment manufacturer for proper installation. <br /> Monitoring Capabilities—(All O/C Tanks <br /> Double-wall Tanks) B3. Installation of Vacuum or Air <br /> The following restrictions apply for the various types of double-wall tank Pressure Monitoring Systems <br /> monitors: <br /> a.Liquid sensors—when"dry"cavity monitors(which detect the Consult monitoring equipment manufacturer for proper installation. <br /> presence of a liquid)are used,the cavity between the inner and outer <br /> tank may be either vented to the atmosphere or sealed. B4. Installation Of Hydrostatic Tank <br /> b.Gasoline vapor sensors—when gasoline vapor sensors are used,the <br /> -r► cavity between the innerand outer tank may beeither vented atthe Monitor <br /> atmosphere or sealed. <br /> Additional Monitoring Capabilities See next page. <br /> (Tank Models DWT-21P and DWT-4P Only). If you have an installation condition which is not fully addressed in these <br /> c.Hydrostatic Tank Monitor—tank burial depth must not exceed 7'from instructions,pleace call the O/C Tanks Installation Manager at <br /> tank top to finish grade. 419-248-7371. . <br /> If you need to schedule a tank repair,please call the O/C Tanks Field <br /> The monitoring cavity between the inner and outer tank must be vented Service Manager at 419-248-8196. <br /> to the atmosphere.The optional reservoir sensor,supplied by O/C <br /> Tanks senses the liquid level in the reservoir and also automatically <br /> vents the monitoring cavity. <br /> d.Vacuum monitoring—when vacuum monitoring is used,the maximum <br /> vacuum is 3"mercury(1.5 psi maximum). <br /> e.Positive air pressure monitoring—when positive air pressure <br /> monitoring is used,the maximum air pressure is 3 psi. <br /> i <br /> 7 <br />