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Double-Wall Tank Witoring N <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 responsibility 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 /> 131 . Alternate Tank Monitoring Systems installation.lithe 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 These sensors are normally installed using an electrician's wire puller to <br /> of leak monitoring systems,if another type of tank monitor is specified in. position the sensor at or near the tank bottom.Most sensors can be <br /> itially.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'NPT Monitoring Fittings inshillrgmd <br /> orvam, <br /> Monitor sansorshere <br /> Monitoring Fittings 1 <br /> High <br /> End of Lowand <br /> Tank oltank <br /> Optional —� <br /> 2'Slope <br /> iberglasa Maximum Liqultl or Vapor Sensors <br /> FReservoir' <br /> The cavity space between the inner and outer tank is 1"for tanks 8' <br /> diameter and less;the cavity space is 11/2"for 10'diameter tanks. <br /> -Tank yodels DWT 2P and DW T.4P onty Consult monitoring equipment manufacturer for proper installation. <br /> Monitoring Capabilities—(All O/C TANKS B3. Installation of Vacuum or Air <br /> Double-Wall Tanks) Pressure Monitoring Systems <br /> The following restrictions apply for the various types of double-wall tank <br /> monitors: Consult monitoring equipment manufacturer for proper installation. <br /> a.Liquid sensors—when"dry"cavity monitors(which detect the <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 Monitor <br /> cavity between the inner and outer tank may be either vented to the <br /> atmosphere or sealed. See next page. <br /> Additional Monitoring Capabilities If you have an installation condition which is not fully addressed in these <br /> (Model P Tanks Only). instructions,please call the 0/C TANKS Installation Manager at(419) <br /> c.Hydrostatic Tank Monitor—tank burial depth must not exceed 7'from 419-248-7371. <br /> tank top to finish grade. 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 office nearest you.Phone numbers are listed in section At 9. <br /> to the atmosphere.The optional reservoir sensor,supplied by OIC . <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).The maximum burial depth is <br /> three feet. <br /> e.Positive air pressure monitoring—when positive air pressure <br /> monitoring is used,the maximum air pressure is 3 psi. <br /> 7 <br />