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O ANCHORING TANKS Concrete Base Tanks must be anchored in locations where water could enter the hole. Anchor points must be located less than 5.5 feet (1.7 - ' meters)from the tank centerline on 10 foot(3.2 meters) FRP HOLD DOWN STRAPS diameter tanks, 4.5 feet (1.4 meters) on 8 Xerxes Century-Cast fiberglass preshaped FRP straps foot (2.5 meters) di- are available when a tank must be anchored. Tanks ameter tanks, 3.5 feet should be anchored in locations with high water tables, (1.1 meters) on 6 foot or in installations where water could enter the hole. (1.9 meters) diameter Nominal Tank tanks, 2.5 feet (0.8 Tank Size O.D./Dia. No.of Straps meters) on 4 foot (1.3 550; 1,000 4' 2 2,000;4,000 6' 2 meters) tanks. 6,000 6' 4 The anchors must be s,000 8' 2 fflliii� 8,000-12,000 8' 4 secured in concrete '12 oeo 10,000-15,000 10' 4 and attached to the ilia 20,000 10' 6 hold-down straps with CAUTION: All hold-down straps must be uniformly wire cable(see table II) using at least three cable clamps. snug. The load will be equally distributed when all straps are uniformly snug over the tank. Straps must TABLE II be tightened until they are snug, but cause no de- REQUIRED WIRE ROPE/TURNBUCKLE SIZE flection b checking tank diameter ick Wire Rope yecganameer wa gauge stick Diameter 1/2"(13mm) before and after snugging straps. Maximum allow- Tensile strength 12,500 lbs.(5670 kg) able deflection is 1/2 inch for 4 foot,3/4 inch for 6 foot, Turnbuckle Diameter Hook Type 11/4"(32mm) 11/4 inch for 8 foot and 11/2 inch for 10 foot diameter Eye Type 3/4"(lsmm) tanks. All tanks must be measured to determine vertical deflection before and after installation. Deadman CAUTION: Place straps only on locations designa- A deadman must be a concrete beam with a total length ted by arrows (►4) stenciled on tank. of 12 inches (30cm) greater than the total length of the tank. See table below for deadman dimensions for each Top Cable/Clamp Method tank size. An alternative method is to clamp the cables at the top TABLE III of the tank. In this REQUIRED method, triple clamp a DEADMAN DIMENSIONS cable to each end of the it TANK DEADMAN SIZE SIZE strap, thread each ca- 4 n.(1.2 m) 6••x 6 ble around the anchor (15 cm x 15 cm) or dle (30 eadman, and tri 6ft.(,.Bm) x,2 p / (30 cm x 30 cm) clamp the cable ends at CABLE 8 ft.(2.4 m) 12 x,2" the top of the tank. The ME Ho (30 cm x 30 cm) o 10 M.(3.0 m) 18••x 24" cable must rest on the (46 cm x 61 cm) top of the hold-down '� ° strap between the ti, Lay the deadman guides provided. Ad- parallel to the tank, just tension on cables not more than 5.5 1 = " evenly. feet(1.7 meters)from the centerline of the 10 foot (3.2 meters) diameter tanks, 4.5 feet (1.4 me- ters)on 8 foot(2.5 meters)diameter tanks,3.5 feet(1.1 meters) on 6 foot (1.9 meters) diameter tank, 2.5 feet (0.8 meter) from centerline of 4 foot (1.3 meters) tank. Position each hold-down strap so it will be centered on the locations designated by arrows (PA) stenciled on the tank. 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.