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0 DWT -11 Appurtenances and Accessories Standard "Tank Notes: 1. Tank bottom gauge/deflector plates FA] are standard under every manway and service fitting. 2. Anchoring strap locations are indicated 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 primary tank are 4' NPT half couplings. All primary tank fittings 101 are mounted on the manways. (Additional manways and fittings are available on made-to-order tanks.) 4. Monitor Fittings. Two 4" monitor fittings, one located at each end of the tank on most models, provide access to the rib cavity and the interstice at the bottom of the tank. 5. Monitoring capabilities. Four generic types of monitoring systems may be used with Xerxes double wall tanks. Note that certain restrictions may be applicable. A. Hydrostatic Monitor. When a Ia hydrostatic monitoring system is used, the level of liquid in the reservoir may be monitored to detect a leak in either the inner or outer wall of the tank. Optional reservoir sensors supplied by Xerxes are available. B. Vacuum Monitoring. When vacuum monitoring is used, a maximum of 3" mercury (1.5 p.s,i. max.) must be maintained. c. liquid Sensors. When dry interstitial monitors are used, the monitor is positioned within the rib at each end of the tank on most models. The interstice may be either vented or sealed. D. Positive Air Pressure. When positive air pressure monitoring is used, the maximum air pressure is 3 p.s.i. Steam Curing (optional) When tanks are specified for containment of other than petroleum based products, i.e. potable water, a special steam cure is available. The N.S.F. (National Sanitation Foundation) label (M.W. required) is available from several Xerxes facilities. Monitor Fittings k'' If tanks are ordered with a dry interstitial space, the fitting permits monitoring through a rib passage to the bottom of the tank. The fittings, located on both ends of the tank, allow for the placement of probe(s) to detect the presence of liquid in the interstitial space. One monitor fitting is standard in the 550, 1,000 and 2,500 gallon tanks; and two are standard in 3,000 gallon through 30,000 gallon tanks. Fiberglass Flanged Manways Manways provide both access to the interior of the tank as well as a location for service fittings. The standard manway I.D. is 22" Manways with 30" and 36" I.D.'s are available on certain larger tanks. Each manway is provided with a steel cover, with plated bolts, nuts and washers and a U.L. listed gasket. Manways are placed in standard locations as shown on the tank specification drawings. NPT Fittings Steel NPT service fittings in the manway cover are available in 2, 4",' 6" and 6" half couplings. Standard tanks, 3,000 gallons and larger, have manways with 3-4' NPT fittings in each cover. On 550, 1,000 and 2,500, 4-4" NPT fittings in the cover are provided. Gauge/deflector plates are included under all service fittings. a-a77T-i 22" Manway Cover ei-� 22" Manway Cover (3-4" In-line fittings) W NFT •' 4" NPT Fitting Iii' ;t 28' Dia. 3/" Dia. {24) HalesBolt Circle Equally Spaced 8' .8' g' 30" Manway Cover (3-4" In-line fittings) Optional 3A" NPTj +k 371WOR . 4" NPT Fitting (3) - 34W Dia. 3." Dia. (30) Holes Bolt Circle Equally Spaced 12" 12" Lifting Lugs See technical tank drawings for locations. (3-4" Fittings at 1201 120" (TyP) '%'iNPT ,� •..,. 28' O.D. r I • •i 4" NPT Fitting (3)'f - J 28" Die. Ile Dia. (24) Hales ' Bait Circle Equally Spaced 8 p W Manway Cover (34' Fittings at 120°) Optional 120' (TYP) , NPT ' !� /tt 37W O.D. (ifir% 4" NPT Fining (3)/ �- �]�+ — 34h" Dia. 3/," Dia. (30) Holes \, Bolt Circle Equally Spaced 12,. m 101 Through -The -Wall Service Fitting (TWF) This service fitting allows access to the interior of the primary tank. Fittings through both shell walls (TWF) (not in a manway cover) must be located along the top centerline of the tank or the U.L. label will be void, and are available in 2; 4"or6'NPT.