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5.5.4.Polyethylene film is not considered an effective geotextile 6.2.XERXES PREFABRICATED DEADMEN material.It may tear or degrade while in service. 6.2.1.Xerxes-supplied prefabricated deadmen are pre- engineered and sized to the tank ordered.As with any 6. ANCHORINGTANKS deadmen,water-table height,number of containment sumps and burial depth must be considered. CAUTION 6.2.2.Placement of Xerxes prefabricated deadmen is the same Xerxes recommends that every site be thoroughly evaluated as standard deadmen.(See FIGURE 6-1.) for the potential of a rise in the local water table or of trapped water.Failure to anchor a tank when required may cause tank failure,or damage the tank or surrounding property. Position Strap Clip 6.1.DEADMENat Tank Top HIRD III— IIIII 6.1.1.Deadmen are typically reinforced concrete beams. - I I__ ILI 6.1.2.The length of deadmen is typically equal to the length of the tank. =IIIII II— II 6.1.3.Deadmen may be fabricated in multiple sections as long as __ _._. _ ______ _ IIIII the total length of each deadman is not decreased and as long as —I I I Typical Anchoring c I —IIIII each section contains at least two balanced anchor points. I IIII configuration =III A l.,E B IIII=IIIII 6.1.4.The width and thickness of deadmen depend on the tank I1 II— I _AJIIIII diameter,water-table height,number of containment sumps and = III= Slab burial s 12 Deadman =III IIII burial depth. 6.1.5.Deadmen should be designed according to the American =IIII=IIIII-I - I I=IIII -IIIII=111119111111 Concrete Institute(ACI)code. FIGURE 6-1 6.1.6.Refer to TABLE 6-1 for typical deadmen dimensions given the situation of an empty tank with a burial depth of 3 feet,with 6.2.3.Xerxes prefabricated deadmen are supplied with 3l4-inch- groundwater to grade and with one containment sump. diameter,galvanized,adjustable anchor points(subsequently referred to as anchor points).These anchor points protrude up Typical through the slots in the deadmen and are held up with cotter pins. Tank Diameter Deadman Dimensions (Width x Depth) A WARNING 4' 6"x 6" Only use the anchor points when lifting and positioning the deadmen.A spreader bar may be required to lift longer 6' 12"x 12" sections of deadmen.Use guy ropes to guide the deadmen 8' 12"x 12" when lifting.Failure to do so could result in death or serious injury. 10' 18"x 9" 12' 36"x 8" 6.2.4.The anchor points can be moved and positioned to match the hold-down strap locations on the tank(marked by arrowhead TABLE 6-1 symbols ►4). 6.1.7.Tanks of 10-foot diameter with a capacity of 30,000 gallons 6.2.5.When using these deadmen in man-out-of-hole strapping or larger may require larger deadmen than those in TABLE 6-1, applications,align the anchor points with the proper ribs before depending on burial depth,to offset buoyancy.Contact technical setting them in the hole. support at Xerxes Minneapolis for further information. 6.2.6.Care should be taken to keep backfill from entering the 6.1.8.Lay the deadmen in the excavation parallel to the tank anchor-point slot until final adjustment is made. and outside of the tank"shadow."(See FIGURE 5-3.) 6.2.7.The deadmen are to be butted together when multiple 6.1.9.In multiple tank installations with deadmen: sections are used. • each tank will have its own set of deadmen(one deadman may be used between two tanks if the deadman is double in width); per a Use one anchor point per strap end and only one strap • a separate anchor point must be provided for each hold— down strap; 6.3.ANCHOR SLAB • the minimum spacing between tanks must be no less than 6.3.1.An anchor slab is typically a reinforced concrete base. twice the width of a single deadman. 13