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Double -Wall Tank Monitoring <br />O/C Tanks recommends the Hydrostatic Tank Monitor versus other <br />methods because of its superior leak detection capability. However, the <br />selection of the monitoring system and method is the responsibility of tank <br />owner and/or operator. <br />0 B1. Alternate Tank Monitoring Systems <br />The O/C Tanks double-wall tank is designed to accommodate a variety of <br />leak monitoring systems. if another type of tank monitor is specified initial. <br />I ,Lhe Hydrostatis Tank Monitor can still be activated at afuture date. <br />0 r r'Analternatetankmonitoringsensorcanbelocatedatanymonilodngfit- <br />ling on the tank top. However, to provide maximum future flexibility, <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. <br />'Tank metlels DWT -2P and DWT 4P only <br />Monitoring Capabilities—(All 0/C Tanks <br />Double -Wall Tanks) <br />The following restrictions apply for the various types of double-wall tank <br />monitors: <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. <br />b. Gasoline vapor sensors—when gasoline vapor sensors are used. the <br />cavity between the inner and outer tank may be either vented at the <br />atmosphere or sealed. <br />Additional Monitoring Capabilities <br />(Tank Models DWT -2P and DWT -4P Only). <br />c. Hydrostatic Tank Monitor—tank burial depth must not exceed 7' from <br />tank top to finish grade. <br />The monitoring cavity between the inner and outer tank must be vented <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). <br />e. Positive air pressure monitoring—when positive air pressure <br />monitoring is used, the maximum air pressure is 3 psi. <br />E <br />0 <br />B2. Installation of Liquid or Vapor <br />Sensors <br />When liquid or vapor sensors are used, the tank may be sloped at time of <br />installation. If the tank is sloped, place the lank so that the lowest elevation <br />is at the monitoring end. <br />These sensors are normally installed using an electrician's wire puller to <br />position the sensor al or near the tank bottom. Most sensors can be <br />installed from finished grade. However, for ease of installation, Insert <br />the sensor in the tank cavity before installing the monitoring riser <br />pipe to grade. <br />The space between the inner and outer tank wall is 11/8" for tanks 12,000 <br />gallon capacity and less; the cavity space is 13/411 for tanks 15,000 gallon <br />capacity and larger. <br />Consult monitoring equipment manufacturer for proper installation. <br />B3. Installation of Vacuum or Air <br />Pressure Monitoring Systems <br />Consult monitoring equipment manufacturer for proper installation. <br />B4. Installation of Hydrostatic Tank <br />Monitor <br />See next page. e <br />If you have an installation condition which is not fully addressed in these <br />instructions, pleace call the O/C Tanks Installation Manager at <br />419-248-7371. <br />If you need to schedule a tank repair, please call the O/C Tanks field <br />Service Manager at 419.248.8196. <br />REU00" E I <br />h�,Y 032017 <br />ENVIRONMENTAL HEALTH <br />DEPARTMENT <br />4- NPT Monitoring Fittings Iratallhgmd <br />orvapor <br />Monitor stern rshere <br />r <br />High <br />Enduf <br />Lowend <br />Tank <br />of tank <br />Optional <br />2-Sbpe <br />Maximum <br />Liquid <br />orvaporaerrso a <br />The space between the inner and outer tank wall is 11/8" for tanks 12,000 <br />gallon capacity and less; the cavity space is 13/411 for tanks 15,000 gallon <br />capacity and larger. <br />Consult monitoring equipment manufacturer for proper installation. <br />B3. Installation of Vacuum or Air <br />Pressure Monitoring Systems <br />Consult monitoring equipment manufacturer for proper installation. <br />B4. Installation of Hydrostatic Tank <br />Monitor <br />See next page. e <br />If you have an installation condition which is not fully addressed in these <br />instructions, pleace call the O/C Tanks Installation Manager at <br />419-248-7371. <br />If you need to schedule a tank repair, please call the O/C Tanks field <br />Service Manager at 419.248.8196. <br />REU00" E I <br />h�,Y 032017 <br />ENVIRONMENTAL HEALTH <br />DEPARTMENT <br />