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V � - d,o �i • e e • All primary tanks and compartments that contain HYDROSTATIC MONITORING product must be vented at all times,except as Because of its superior leak detection capability, defined during pre-installation testing. Containment Solutions recommends the Hydrostatic • Tanks are designed for operation at atmospheric Tank Monitor for continuous monitoring of the annular pressure only(except for use with vapor recovery space. However,the tank owner or the tank owner's systems provided the pressure or vacuum does not representative is responsible for selecting the monitoring exceed 1 psig). system. • The tank's venting system must be adequately sized • Tanks with hydrostatic monitoring systems normally to ensure that atmospheric pressure is maintained at arrive with monitoring fluid installed in the annular all times, including when filling and emptying the tank. space and some fluid in the reservoir. • Annular space vents must be independent of tank - After installation,the fluid level in the reservoir must vents. be filled to the proper level. • For hydrostatically monitored double-wall tanks, - Additional monitoring fluid is supplied with the tank the annular space must be vented at all times. for this purpose. • For dry monitored double-wall tanks, annular space does not need to be vented. Hydrostatic monitoring cavity between the inner and outer tank must be vented to the atmosphere.If o ti unvented,pressure buildup can cause tank damage. Pressurized product deliveries are not • Vent annular space with a minimum W,hole at riser recommended as tank damage may occur. top. • CSI recommends only gravity-filling of tanks. • When installing a double float sensor,the bottom of • If the delivery vehicle uses pumps to fill the tank: the sensor must be in contact with the tank top (see Figure 0-1). - Install positive shut-off equipment in the lines Figure 0-1 and on the truck to prevent the tank from being overfilled. . .. Concrete Traffic Pad - Pressurization from overfilling will damage the rHigh tank, even if the tank vent is unrestricted.- Do not use a ball float valve for overfill protection. Riser Pipe and CapFloat Fitting with minimumoir Sensor 1/4"Vent Hole Reservoir el Alarm Do not enter tank unless following OSHA guidelinesMonitoring Fluid Level for confined space entry. Failure to follow OSHA Alarm guidelines could result in death or serious injury. Sensor in Contact with Tank Top Always wear safety glasses and protective clothing ASPHYXIATION FIRE EXPLOSION [when handling monitoring fluid. • The load bearing capacity for a standard 22" Monitoring fluid spillage may cause surfaces to be manway installed is 1,200 lbs.for single-wall tanks slippery. and 2,400 lbs.for double-wall tanks. Refer to MSDS sheet for additional Information. • All 30"and 36"manways have a load bearing capacity of 2,400 lbs. If a tank has a reservoir installed,and arrives without • Do not exceed 50 ft-Ab.torque during bolt tightening monitoring fluid pre-installed,the annular space can be filled with monitoring fluid after the tanks have or manway flange damage may occur. been placed in the excavation and backfilled to the tank top. 23