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