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BOTTOM <br /> 12.3.4. Install shoring,if necessary,to make sure that Figure 13-2 <br /> existing tanks do not move and sufficient <br /> backfill remains. ti <br /> 12.3.5. Install all tanks followin the instructions9 outlined in this manual.12.3.6. Follow and complete the Tank Installation <br /> Checklist for all new and existing tanks. <br /> 13. PIPING&BOTTOM <br /> =no Od I 14.1. All primary tanks and compartments that <br /> contain product must be vented at all times, <br /> All connections to the tank must beflexible.Provisions except as defined during pre-installation testing. <br /> must be made to accommodate movement and 14.2. Tanks are designed for operation at atmospheric <br /> misalignment between the piping and the tank. pressure(except for use with vapor recovery <br /> Failuretodothismay damage the tank orsurrounding systems provided the pressure or vacuum does <br /> property. not exceed 1 psig). <br /> 14.3. For tanks with inlet or outlet piping that will <br /> 13.1. Tanks with Bottom Sumps/ Fittings result in pressure at the tank top,the pressure <br /> P g should be limited to 1 psig. <br /> 13.1.1. To install a tank with a bottom sump or fitting, 14.4. The tank's venting system must be adequately <br /> the excavation and backfill must be modified sized to ensure that the pressure or vacuum <br /> as follows.Refer to Supplement Documents at the tank top will not exceed 1 psig at the <br /> (Section 21)for additional information: tanktop at all times,including when filling and <br /> 13.2. External Piping emptying the tank. <br /> 13.2.1. Isolate the piping from the concrete pad 14.5. Annular space vents must be independent of <br /> (see Figure 13-1). tank vents. <br /> Figure t3-1 14.6. For hydrostatically monitored double-wall tanks, <br /> the annular space must be vented at all times. <br /> Isolate from Concrete Pad Concrete Pad 14.7. For dry monitored double-wall tanks,annular <br /> space does not need to be vented. <br /> Flexible Connector Flexible Connector <br /> Pressurized product deliveries may pressurize the tank <br /> and result in tank damage. <br /> 15.1. If the delivery vehicle uses pumps to fill the tank: <br /> 15.1.1. Install positive shut-off equipment in the lines <br /> 13.2.2. A flexible connector must be directly installed and on the truck to prevent the tank from <br /> on all tangentially mounted fittings,nozzle or being overfilled. <br /> pipe.The flexible connector must allow for 1/2" 15.1.2. Pressurization from overfilling will damage the <br /> of offset,angular,expansion,and compression tank,even if the tank vent is unrestricted. <br /> movement.Refer to Supplemental Documents 15.2. Do not use a ball float valve for overfill <br /> (Section 21)for additional information. protection. <br /> 13.2.3. Nozzle bolt torque can be found in Flexible <br /> Connector supplemental document.Refer <br /> to Supplemental Documents(Section 21)for <br /> additional information. <br /> 13.2.4. Take precaution during construction to make Do not enter tank unless following OSHA guidelines for <br /> sure no damage occurs to the exposedpipe(s). confined spaceentry.Failuretofollow OSHA guidelines <br /> 13.2.5. Internal piping must terminate a minimum could result in death or serious injury. <br /> of 4"from tank bottom for 4',6'8;and 10' <br /> diameter tanks and 6"from the bottom for ( \� <br /> 12'diameter tanks to allow for tank deflection <br /> (see Figure 13-2). <br /> ASPHYXIATION FIRE EXPLOSION <br /> 22 <br />