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ii <,For further information concerning fabric specifications and instal- SUMMARY lafiDn procedures,consult the fitter fabric supplier's installation 1. Prepare the tank bed. guides or instructions. 2. Set and level the tanks. To install filter fabric,typically filter fabric manufacturers recom- 3. Measure the tank diameter. mend that the installer line the excavation sides and bottom with 4. Install holddown hardware(it applicable). the fabric.Overlap adjoining panels by at least twelve inches. 5. Place and probe the first two lifts of backfill material. Place backfill material on the panels around the edge of the hole 6. Add backfill to the top of the tank. to anchor them in place.. 7. Measure the tank diameter and repeat the air test. In wet-hole conditions,use backfill material to sink and hold the After the air test and measurement of tank deflection are success- fabric uccess fabric in place on the hole bottom. fully completed,it is recommended that the tank be ballasted until piping installation and final backfilling to grade is completed.When DRY T filling the tank make sure that the tank is adequately vented.The CAUTION:Xerxes recommends that every site be thoroughly vent must be large enough to allow the displaced air to escape. evaluated for the potential to trap water or otherwise subject the NOTE:Do not ballast the tank until the ball is even with the top of the tank. tank to a rise in the local water table.Xerxes recommends that all WARNING:If product is used as ballast,exercise special care in tanks be anchored in installations in which water may enter the handling.Safeguard against sparks,fire or product spills.Improper ; hole.Failure to anchor the tank in a wet hole may damage the tank handling of product can cause afire or explosion,and death, - _''or surrounding property. severe personal injury or property damage. Prepare a smooth,level bed,12"thick,of approved backfill 6. WET T LE INSTALLATION material. Place the tank or tanks ortto the bed.Do not set Xerxes tanks directly onto a concrete slab or on timbers,cradles or WARNING:Do not use air pressure to test tanks that contain flam- directly onto the hole bottom. mable or combustible liquids,or vapors,and do not perform any Leveling:As the tank is being placed,set the tank pitch as shown post installation pressuretest.The fuel and air mixture may explode on the site plans.Xerxes does not require that a tank be pitched. and cause death,severe personal injury,or property damage. All pitch is determined by the tank owners specification.. If a double CAUTION:Never allow an empty tank to remain in a wet hole,or a wair tank is pitched,the monitor should be at the low end. Use the dry hole that may become wet unless anchoring and backfilling tops of the ribs to establish longitudinal level.Establish lateral level have been completed.Failure to anchor and backfill may damage by placing the level across the top of a fitting,a manway or a collar. the tank or surrounding property. When the tank is placed,take the first diameter reading(Deflection NOTE:Deflection readings to be taken in sequence similar to steps described.in'' reading"A'on the checklist).See Section 13 for instructions on sections. taking deflection readings. Pump the water from the hole to maintain minimum water level. j If the tank is to be anchored,install the anchoring hardware at this Add a minimum of 12 inches of well-placed backfill material to the time(See Section 7). hole,and level the bed to assure uniform bottom support for the { BACKFILLING tank. Position the tank in the hole. ! Use only approved backfill material(See Section 3).Do not mix Partially ballast tank until it settles firmly on the prepared bed. approved material with sand or native soil. Do not use native soil Ballast level in a tank must never exceed water level in hole during as backfill material.All excavated native soil must be replaced with installation.Use only enough ballast to sink the tank until backfill approved material.Place one 12"lift of material evenly around the material is even with the top of the tank. tank.From the hole side or the top of an adjacent tank,work the WARNING:If product is used as ballast,exercise special care in material by hand completely beneath the tank body and domes to handling.Safeguard against sparks,fire or product spills.Improper provide full support.Use a nonmetal probe bar long enough to handling of product can cause a fire or explosion,and death, reach beneath the tank and push the backfill in place.Repeat this severe personal injury or property damage. step with a second 12"lift.After the second lift of material has been After leveling tanks,the anchoring procedures in Section 7 must placed and probed,the backfill can be brought to the top of the be followed. tank without further hand work. CAUTION:Do not strike the tank with the probe bar.The tank may Backfill must be added evenly after anchoring,and remaining be damaged and require repair. dry hole backfilling procedures should be followed as stated in Section 5. _ = NOTE:Cover depth must meet minimum depth specified in Section 7 of these R 1 GH7 _ - WRONG _ installation instructions. NOTE:It is recommended that the tank be completelyballasted once backfill is even with the top of the tank. —� 14 _ jj FIGURE 5-1 FIGURE 5-2 When the tank is backfilled to the tank top: •take an intermediate diameter reading as an in-process check. MRE — •repeat the 5 PSIG(3 PSIG for 12-foot tanks)air test as outlined in Section 2,soaping all exposed areas of the tank and all fittings. FIGURE 6-1