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ANCHORING 8.4.4. 12'tanks need a minimum cover of 48"backfill 9.7. General Anchoring Requirements or 36"backfill plus 6"reinforced concrete. ANCHORING9. • Metal hardware(strap ends,wire rope,and turnbuckles) should never be in direct contact with any portion of Every site should be evaluated for buoyant conditions the tank or tank damage may occur. including but not limitedto local watertables,flooding 9.7.1. Prior to anchoring,take the first deflection and trapped water. Failure to provide sufficient measurement me anchoring, take istdefledintothe overburden and/or appropriate anchoring may result excavation.If mechanical anchoring is used, in tank failure and property damage may occur. take the second deflection measurement of 9.1. It is the responsibility of the tank owner or the tank after the anchoring is complete and record the results on al the Tank Installation tank owner's representative to determine the Checklist(Additional information ct deflection appropriate anchoring method and to design measurements can be found in Section 11). the anchoring system. 9.2. CSI has provided an"Anchor Chart"at the end 9.7.2. Use only CSI anchor straps of this instruction booklet(Appendix A)that 9.7.3. Use correct length anchor straps for each covers the minimum burial depths for the three diameter tank. common methods of anchoring tanks. 9.7.4. Anchor points must be aligned with 9.3. The three common methods are: designated anchor ribs ►t (±1").Do not use straps between ribs except on 4'tanks. • Deadmen Anchors 9.7.5. Maintain proper distance between anchor • Concrete Anchor Pad points across the diameter of the tank: • Overburden(no mechanical anchoring) 9.7.5.1. For dead men,place inside edge of 9.4. CSI offers an engineered mechanical anchoring deadman at the tank shadow. system designed for each size tank consisting of 9.7.5.2. For bottom anchor pad,position anchor deadman anchors,straps,and hardware. point 6"from tank shadow for 4,6,and 8' 9.5. Burial depth,straps,turnbuckles,shackles, tanks;9"for 10'and 12'tanks. wire rope,deadmen and anchor pads can be 9.7.6. All anchor straps must be uniformly tightened combined to provide anchoring using the with turnbuckles or come-a-longs.Straps information provided in this section. should be snug,but not cause tank deflection. 9.6. The mechanical anchoring methods are shown 9•$• Anchor Point Loads in Figure 9-1. 9.8.1. For any anchoring system,the tank strap and all Figure 9-1 hardware should be designed for the following maximum working loads which will provide a Mechanical Anchoring Methods minimum 3:1 factor of safety(see Table 9-1). C51 Table 9-1 Deadmen Anchors Anchor Point Load Allowed Tank Concrete Tank Diameter Maximum Load Shadow Anchor Pad 4' 1,261 lbs(572 kg) 6' 5,405 lbs(2,452 kg) •% 8' 7,5081bs(3,406 kg) 10' 7,508 lbs(3,406 kg) ?/ 12' 7,508 lbs(3,406 kg) 9.8.2. The installing contractor is responsible for providing hardware and anchor points of 9. sufficient size and strength. 9.8.3. For specific information on hardware and usage,consult the hardware manufacturer or supplier. 15