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optiom <br /> Standard Tank Notes Shell Wall Service Fitting <br /> 1.Tank bottom gauge/deflector <br /> plates are standard under every This service fitting allows access to the interior of the primary <br /> manway and service fitting. tank. Fittings through both shell walls must be located along <br /> 2.Anchoring strap locations are indi- the top centerline of the tank or the UL label will be void.They <br /> cated by arrows on each side of are available in 2", 4"or 6"NPT half-couplings.An 8"NPT <br /> certain ribs. Straps are to be placed half-coupling is available <br /> in manway <br /> on the top of these ribs. only. See standard cover <br /> 3. Standard service fittings to the pri- drawings for size <br /> mary tank are 4"NPT half-cou- and quantities. <br /> plings. <br /> Additional manways and fittings <br /> are available on made-to-order <br /> tanks.) <br /> 4. 4"monitor fittings provide access <br /> to the rib cavity and the interstice. <br /> 5. Four generic types of monitoring <br /> systems may be used with Xerxes <br /> double <br /> bma wallapply.- <br /> tanks. Certain restric- <br /> tions Duplex Shell Wall <br /> Y <br /> a. Hydrostatic Monitor—When a Service Fittings <br /> hydrostatic monitoring system is <br /> used, the level of liquid in the reser- Duplex service fittings allow for the placement of two service <br /> voir may be monitored to detect a connections in one location. Fittings are placed astride the tank's -� <br /> leak in either the inner or outer wall centerline in any standard fitting location. Fittings are available <br /> of the tank. Optional reservoir sen- in 2", 4"and 6" <br /> sors supplied by Xerxes are avail- NPT half-couplings. <br /> able. <br /> b. Vacuum Monitor—When vacu- <br /> um monitoring is used, a maximum <br /> of 3"mercury 1.5 psi maximum) <br /> must be maintained. <br /> c. Liquid Sensors—When dry inter- <br /> stitial monitors are used, the moni- <br /> tor is positioned—on most models <br /> over the rib at either end of the <br /> tank.The interstice may be either <br /> vented or sealed. <br /> d. Positive Air Pressure—When poli- Fiberglass Nozzle <br /> tive air-pressure monitoring is used, g <br /> the maximum air pressure is 3 psi. Flanged and Gusseted <br /> Flanged and conically gusseted fiberglass reinforced plastic(FRP) <br /> nozzles are available in 2", 4", 6 and 8"diameters.The flange <br /> face matches the ANSI 150#face pattern. Mating flanges must <br /> be flat-faced. These fittings may only be placed on the top cen- <br /> terline of the tank. <br /> Q <br /> 10 <br />