INSTALL 2018 - Laserfiche WebLink

Home Browse Search

8: COMPLETING 8.6. MONITORING DOUBLE-WALL TANK INSTALLATION WITH A WET INTERSTITIAL SPACE 8.6.1.A double-wall tank maybe shipped with a factory-installed 8.1.TAKING DIAMETER MEASURE#4. TRUCHEK®monitoring system,which enables the owner to have continuous monitoring or to conduct a tank-tightness test. 8.I.I.When the tank has been backfilled tosubgrade(but before • TRUCHEK meets the EPA criteria for tan k-tightness testing. placementofconcrete orasphalt),take the last required tankdiameter Seethe TRUCHEK brochureformore information. measurement.Record it as Measurement#4 on the Tank Installation • When a double-wall tank is shipped with the TRUCHEK monitoring Checklist and determine whether tank deflection is within the allowable system,theinterstitialspace istypicallyfilledwith monitoring fluid limits shown in the Installation Manual. atthe manufacturing facility. 8.1.2.In atank with a wetinterstitial space,the level ofthe monitoring • Some tanks with TRUCHEK installed may be shipped with extra flumonitoring fluid so the monitoring-fluid level can be topped off. monitoring ygfluid have anstbechged eckedang kd/oradjused.Therefore, or propleverlevef the e Do not add monitoring fluid until aftertank burial is completed monitoring fluid must he checked andloradjusied for proper level after backfill and top slab placement is completed. and the monitoring system is set up. 8.2.MONITORING TANKS NOTICE All wet interstitial spaces must be vented to atmosphere. 8.2.I. Itisthe responsibility ofthe tank owner and/or operator Failure to follow this notice could result in damage to the to determine the appropriate monitoring system and method if one tank and/or surrounding property.See section 7.3. is to be used. NOTICE 8.3.MONITORING SINGLE-WALL TANKS Monitoring fluid should not be present in the standpipe 8.3.1.Single-wall tank installations may require release detection except during a TRUCHEK test.Monitoring fluid in the monitoring,which can include inventory control,automatic tank standpipe could create excessive pressure on the interstitial gauging,vapor monitoring or groundwater monitoring. space and could result in damage to the tank.See the TRUCHEK brochure for more information. 8.3.2.Check with appropriate governmental agency officials 8,6.2.When the tank is delivered and before it is installed,check for requirements in yourarea. the monitoring-fluid level and record it on the shipping/receiving 8.4.MONITORING DOUBLE-WALL TANKS paperwork and Tank Installation Checklist. 8.4.1.Adouble-wall tank has an interstitial space between • The required operating level for the monitoring fluid the wall of the primary(internal)tank and the wall of the in the reservoir is 112 full.If necessary,add monitoring secondary(external)tank for the detection and containment fluid to meet that level—BUT not until after the tank is buried of product from the primary tank. and the monitoring system is set up. • If monitoring fluid is not in the reservoir,contact the manufacturing 8.4.2.A double-wall tank,as supplied,will have a minimum facility that shipped the tank, of monitoring access fitting that provides access into the • In a tank with the interstice filled with monitoring fluid,using interstitial space. a nonmetallic standpipe in the reservoir is recommended. 8.4.3.Liquid and vapor sensors are installed through the monitoring • The monitoring-fluid level may fluctuate during shipping and installation. access fitting. • Mostsensors can be installed afterthe tank has been backfilled If a tank is sloped,the reservoirshould be atthe high end. to grade. 8.6.3.During the installation process,the monitoring-fluid • For ease of installation,the sensor may be inserted into the level in the reservoir will rise naturally under various conditions: monitoring access fitting before installing the monitoring riser • preinstallation pressure test pipe to grade. • rise in groundwater level ll 8.5. MONITORING DOUBLE-WALL TANK WITH • balastinompaction • ballastin A DRY INTERSTITIAL SPACE g • temperature increase 8.5.1.Asafe electronic or mechanical monitoring system should 8.6.4.Checkand record the monitoring-fluid level during be used to detect productand incoming water. the installation process.See the Tank Installation Checklist. 8.5.2.The monitoring system should detect product and water 8.7.SETTING THE LEVEL at the bottom of the interstice. OF THE MONITORING FLUID • Use a drawstring to position the monitoring sensor at or near the bottom of the tank. 8.7.1.After completing the backfilling and placing the top slab: • If a double-wall tank is sloped,the monitor should beat the low end. • check the level of the monitoring fluid in the reservoir and 8.5.3.For liquid or vapor sensors,the monitoring access fitting set the monitoring fluid to the proper level. maybeventedtoatmosphere(independentfromtheprimarytank) • Failure to set the monitoring-fluid level properly could lead to false alarms. or sealed. 26 7: PIPING,VENTING AND CONTAINMENT SUMPS/8: COMPLETING INSTALLATION