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CAUTION: Xerxes recommends that every site be thoroughly <br />evaluated for the potential to trap water or otherwise subject the <br />tank to a rise in the local water table. Xerxes recommends that <br />all tanks be anchored in installations in which water may enter <br />the hole. Failure to anchor may damage the tank or surrounding <br />property. <br />DEADMAN ANCHOR: <br />A deadman is a reinforced concrete beam with a total length 12 <br />inches greater than the overall length of the tank. A deadman may <br />be fabricated in multiple sections as long as the total length is not <br />decreased and each section contains at least two anchor points. <br />The width and thickness depend on the tank diameter. Refer to <br />Table 7-1 for specific dimensions. <br />TABLE 7-1 <br />TANK DIA. <br />(FT.) <br />DEADMAN DIMENSIONS <br />(W x D) (IN.) <br />SLAB WIDTH <br />(FT.) <br />4 <br />6" x 6" <br />5' <br />6 <br />12" x 12" <br />8' <br />8 <br />12" x 12" <br />10' <br />10 <br />18" x 12" <br />12' <br />12 <br />36" x 8" <br />14' <br />FIGURE 71 <br />Lay the deadmen in the excavation parallel to the tank and outside <br />of the tank "shadow" (see Figure 71). In multiple tank installations, <br />each tank will require two deadmen. The minimum spacing <br />between tanks must be equal to twice the width of a single <br />deadman. One deadman may be used between two tanks if it is <br />doubled in width. Provide a separate anchor point for each <br />holddown strap. <br />ANCHOR SLAB: <br />An anchor slab is a reinforced concrete base. The total length of the <br />slab is 12" greater than the overall length of the tank. The minimum <br />slab thickness is 8". The width of the slab depends on the tank <br />diameter. Refer to Table 7-1 for specific dimensions. Refer to Table <br />7-2 and Figure 7-2 for anchor point dimensions. Provide a separate <br />anchor point for each holddown strap. When using a concrete base <br />slab, allow sufficient depth in the excavation for 12" of bedding <br />material below the tank. <br />TABLE 7-2 <br />TANK DIA. <br />DIM "A" <br />DIM "B" <br />DIM "C" <br />DIM "E" <br />MIN. MAX. <br />DIM "D" <br />4' <br />24" <br />18" <br />12" <br />27" <br />30" <br />8'- 4'/a" <br />6' <br />35" <br />23" <br />13" <br />42" <br />48" <br />12'-1 " <br />8' <br />43" <br />31" <br />15" <br />52" <br />58" <br />15'-1" <br />10' <br />57" <br />45" <br />15" <br />69" <br />75" <br />18'- 83W' <br />12' <br />58" <br />50" <br />23" <br />87" <br />93" <br />22'- 63W' <br />POSITION STRAP CLIP <br />AT TANK TOP <br />"C" <br />TYPICAL ANCHORING <br />CONFIGURATION <br />FIGURE 7-2 <br />