/ 



20. Continued 



of using a free-fall-cmplaccd deadweight anchor installation is highlighted. I'ile anchors 

 attached to a common frame (template) were selected as the better choice on the hard 

 (rock) seafloors often found in the high-energ)', shallow-water areas of the Gulf Stream. 

 I'urther development of the pile anchor system for OTEC, however, is probably not neces- 

 sary because it is expected that such hard seafloor anchor sites are besr avoided by OTEC 

 plants. A plan for development of the frce-fall-emplaccd deadweight anchor is presented 

 and a plan for implementation recommended. The development plan includes evaluation 

 of the hydrodynamic stability of the free-falling anchor, development of the soil-penetration/ 

 anchor-deceleration inter-relationship, assembly of a structural analysis and dcsii,n technique 

 for the anchor, and finally a demonstration of a near prototype size OTEC free-fall dead- 

 weight anchor in early 1980. 



Library Card 



Civil Engineering Laboratory 



OTEC ANCHORS: SELECTION AND PLAN FOR 

 DEVELOPMENT (Final), by P. J. Vilcnt and J. M. Atturio 

 TR-859 31 pp illus December 1977 Unclassified 



Deadweight anchors 



2. OTEC mooring 



1. ERDA 42-021 



-- tV Anchor systems capable of maintaining the Ocean Thermal Energy Conversion (OTEC) 

 power plants on station were identified and compared. Deadweight anchors with base shear 

 keys were selected as the best choice for the more common ocean environments. Concepts for 

 transporting and lowering the required deadweight anchor systems to the seafloor site arc des- 

 cribed and their limi;ations noted. The attractiveness - and technical feasibility - of using a 

 frec-fall-emplaced deadweight anchor installation is highlighted. Pile anchors attached to a com- 

 mon frame (template) were selected as the better choice on the hard (rock) seafloors often found 

 in the high-energy, shallow-water areas of the Gulf Stream. Further development of the pile 

 anchor system for OTEC, however, is probably not necessary because it is expected that such 

 hard seafloor anchor sites are best a/oided by OTEC plants. A plan for development of th.- free- 

 fall-emplaced deadweight anchor is presented and a plan for implementation recommended. The 

 development plan includes evaluation of the hydrodynamic stability of the free-falling anchor, 

 development of the soil-penetration/anchor-deceleration inter-relationship, assembly of a struc- 

 niral anal>-sis and design technique for the anchor, and fmally a demonstration of a near proto- 

 type size OTEC free-fall deadweight anchor in early 1980. V^ 



iv 



