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OANCHORING TAN* Tanks must be anchored in locations where water could enter the hole. Xerxes Century -Cast FRP pre -shaped straps must be used when a tank is to be anchored. Two straps are required for 550 gallon (2.1 cu. meters) through 6,000 gallon (23 cu. meters) cylindrical tanks; except the 6,000 gallon, 6 foot diameter (23 cu. meters) tank which has four straps; four straps for 8,000 gallon (30 cu. meters) through 15,000 gallon (57 cu. meters) tanks. Six straps are required for the 20,000 gallon (76 cu. meters) tank. • ,, . m s • • Y ••; ,r ..• • • • . :' • • ,.., i • ; ,• • is • .... (0-4) stenciled on tank. An alternative method is to clamp the cables at the top of the tank. In this method, triple clamp a cable to each end of the strap, thread each cable around the anchor or deadman, and triple clamp the cable ends at the top of the tank. The cable must rest on the top of the hold- down strap between the guides provided. Adjust ten- sion on cables evenly. r Anchor points must be located less than 4.5 feet (1.4 meters) from the tank centerline on 8 foot (2.4 meters) diameter tanks, 3.5 feet (1.1 meters) on 6 foot (1.8 meters) diameter tanks, 2.5 feet (0.8 meters) on 4 foot (1.2 me- ters) tanks or 6 feet (1.9 meters) on the 10 foot (3.0 meters) diameter tanks. The anchors must be secured in concrete and attached to the hold-down straps with wire cable (see table II) using at least three cable clamps. Tank Spherical Cylindrical Wire Rope Diameter 3/8" (10mm) '/2" (13mm) Tensile Strength 9,000 lbs. (4080 kg) 12,500 lbs. (5670 kg) Turnbuckle Diameter Hook Type 3/4" (19mm) 11/4" (32mm) Eye Type 1/2" (13mm) 3/4" (19mm) A deadman must be a concrete beam with a total length 12 inches (30 cm) greater than the total length of the tank. (See Table ill.) TABLE III REQUIRED DEADMAN DIMENSIONS TANK DEADMAN SIZE SIZE 4ft. (1.2m) 6"x6" (15 cm x 15 cm) 6tt.(1.8m) 12'x12" (30 cm x 30 cm) 8ft.(2.4m) 12"x12' (30 cm x 30 cm) 10ft. (3.0m) 18"x24" (46 cm x 61 cm) Lay the deadman parallel to the tank, not more than 4.5 feet (1.4 meters) from the centerline of the 8 foot (2.4 meters) diameter tanks, 3.5 feet (1.1 meters) on 6 foot (1.8 meters) diameter tanks, 2.5 feet (0.8 me- ters) from centerline of 4 foot (1.2 meters) tank and not more than 6 feet (1.9 meters) from the centerline of the 10 foot (3 meters) diameter tank. Position each hold- down strap so it will be centered on the face of the rib designated by the arrows. Fasten the wire cable to the deadman with at least three clamps. Connect the cable and strap with a turnbuckle, then tighten uniformly with other straps.