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r1 U n U HOLDDOWN STRAPS: Xerxes FRP straps must be used when a tank is to be anchored. The location of holddown straps for each tank is marked on the tank by the arrow (>() symbol. Complete data for holddown straps are given in Table 7-2 and Figure 7-2. CAUTION: Place the straps only in the locations designated by the arrow symbol (y<). To evenly distribute buoyancy loads, tighten all holddown straps uniformly until they are snug over the ribs but cause no deflection of the tank. Make an intermediate measurement of the tank diame- ter AFTER the straps have been installed and tightened. HARDWARE AND ANCHORING POINTS: Anchoring hardware and anchor points must be sized according to Table 7-3 and manufactured to industry standards and dimensions. The installing contractor is responsible for providing hardware and anchor points of sufficient strength. The particular configuration of hardware will be determined by the owner or the owner's representative. Locate the anchor points as shown in Table 7-2 and Figure 7-2. Refer to dimension "E". Align all anchor points with the marked ()() location on the tanks, within a tolerance of ± 1 ". For specific information on hardware and its use, consult the hardware manufacturer. CAUTION: Use only appropriate sized hardware with the strap eye. Oversized hardware may damage the strap eye and result in personal injury or property damage. See Figure 7-4 for strap eye dimensions. TABLE 7-3 TANK DIAMETER MINIMUM TURNBUCKLE DIAMETER (BY TYPE) MINIMUM WIRE ROPE DIAMETER HOOK JAW EYE 4' 314" 1/2" 1/2" 318" 6' 314" 112" 1/2" 3/8" 8' 11/4" 314" 314" 1/2" 10' 11/4" 314" 3/4" 1/2" 12' 1114" 3/4" 3/4" 1/2" FIGURE 7-4 NOTE: Drop -forged type turnbuckle may be used in place of all or a portion o4 •wire rope. NOTE: All exposed metal on the holddown straps, turnbuckles and/or threaded rod must be coated or galvanized to prevent corrosion (Figure 7-4A). NOTE: when fastening wire rope, use a minimum of three clamps on each joint. Use shackle -type or chair -type clamps as appropriate (Figure 7-4A). :7 TURNBUCKLE WIRE WIRE ROPE POPE CLAMPS / FIGURE 74A WARNING: Do not use air pressure to test tanks that contain flammable or combustible liquids or vapors, and do not perform any post installation pressure test. The fuel/air mixture may explode and cause death, severe personal injury or property damage. Tanks that will be ballasted with a flammable product should be air tested before ballasting. WARNING: If product is used as ballast, exercise special care in handling. Safeguard against sparks, fire or product spills. Improper handling of product can cause a fire or explosion, and may result in death, severe personal injury or property damage. INTERMEDIATE DEFLECTION MEASUREMENT After backfill is brought to the top of the tank, make an intermediate measurement of vertical deflection according to the instructions in Section 13. TEST After the tank has been measured and vertical deflection is deter- mined to be within the limits specified by Xerxes, the tank must be pressure tested to ensure that no damage occurred during installa- tion. The procedure in Section 2 Pre -installation Testing should be followed, soaping all exposed areas of the tank and all fittings. Because most of the tank exterior is no longer visible, the tank must be tested by checking the gauge for one hour at the test manifold for any drop in pressure. Carefully relieve the pressure in the tank and if applicable remove the hose/valve assembly or quick disconnect assembly from dry Double Wall tanks. WARNING: Do not use air pressure to test tanks that contain flammable or combustible liquids or vapors and do not perform any post installation pressure test. The fuel/air mixture may explode and cause death, severe personal injury, or property damage. Tanks that will be ballasted with a flammable product should be air tested before ballasting. WARNING: If product is used as ballast, exercise special care in handling. Safeguard against sparks, fire or product spills,' Improper handling of product can cause a fire or explosion, and may result in death, severe personal injury or property damage. The tank may be ballasted after the backfill is even with the top of the tank and post -installation testing, if applicable, has been successfully completed. Only under wet -hole conditions as described in Section 6, should ballast be added before the backfill is even with the top of the tank. When filling the tank, make sure the tank is properly vented. The vent must be large enough to allow the displaced air to escape.