Phase I la. When the Phase Ha was initiated in September 1976, 1 

 year after Phase I, information generated in other areas of the OTEC 

 program suggested that the OTEC platforms would likely be scaled down in 

 size, thus reducing the horizontal component of load assumed acting on 

 the anchor. Further, CEL engineers had concluded that the use of high 

 mooring line angles - i.e., greater than 0.8 rad (A5 deg) - would be 

 undesirable not only because of the greater vertical load capacities 

 required of the anchors, but also because of the much greater mooring 

 line loads accompanying the higher line angles. For these reasons, the 

 loading conditions were modified (reduced in magnitude) to the follow- 

 ing: 



(1) for the deep ocean environment, the maximum horizontal loading 

 was reduced to 9 HN (2 x 10 lb), and the maximum vertical loading was 

 reduced to 9 MN (2 x 10^ lb) 



(2) for the Gulf Stream environment, the maximum horizontal loading 

 was reduced to 90 MN (20 x 10 lb), and the maximum vertical loading was 

 reduced to 90 MN (20 x 10^ lb). 



Selection of Anchor Types for OTEC 



Anchor Types Considered . The anchor types were placed in four ' 

 groups to facilitate evaluation (Figure 3): (1) plate anchors (steel 

 plates which are driven edgewise, vertically, deep into the seafloor and 

 then rotated into a horizontal position); (2) drag embedment anchors, 

 such as the STATO, Paravane, or Bruce; (3) pile anchors; and (4) 

 deadweight anchors. 



Elimination of Unsuitable Anchors . ^ 



(1) Plate anchors. Plate anchors were eliminated early in the 

 anchor selection process because they are simply not suited to develop- 

 ing the mooring line capacities required for OTEC in deep water. Develop- 

 ment of the driving system (gun, vibratory hammer, etc.) to drive the 

 plates would be a major effort. Further, ■ this effort would be expended 



