able 10. Materials and Fabrication Cost Estimate for a Typical OTEC Plate Anchor 



Environment - Deep Ocean 



Soil category A (soft clay) 

 Water depth 6000 m fi 



Total mooring force 18 MN (4x10 lbs) 



Anchor Description - nine, 3 m square plate anchors 



Nominal holding capacity (each) - 3 MN (0.67x10 lbs) 



Dimension 3mx3mx83mm 



Weight 5900 kg (13,000 lbs) 



Efficiency 51 . 



Cost 



Hy - 80 steel $0.77/kg 



Fabrication (Welding) 3.63/kg 



Unit Cost 4.40/kg 



Sub-total (1 anchor) 26,000 



Total (9 anchors required) $234,000 



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