Unclassified 



CLASSIFICATION OF THIS PAGEfWhen Dale Enlertd) 



20. Continued 



systems can be operated in water depths to at least 4,500 feet without serious 

 entanglement problems. Payload rotation produced during the deployment test 

 was found to be small and results from variations in static forces. The design of 

 guideline hardware and at-sea handling is discussed. In addition to surface motion 

 compensation, a means for releasing in-line torque must be provided to achieve 

 entanglement-free operations. 



Library Card 



Civil Engineering Laboratory 



GUIDELINE SYSTEMS FOR DEEP-SEA DEPLOYMENTS, by 



Francis C. Liu 



TN-1365 35 p. illus December 1974 Unclassified 



1. Guideline system 2. Load handling I. YF53. 535. 004.01.004 



A guideline is a mechanical cable stretched between the surface and the seafloor to 

 direct a suspended payload to a seafloor site. Two series of sea tests were conducted: one 

 at the 600-foot depth and the other at the 4,500-foot depth. The results of these two sea 

 tests have shown that, after the lift line and the guideline are sufficiently uncoupled from 

 surface excitation, single and double guideline systems can be operated in water depths to 

 at least 4,500 feet without serious entanglement problems. Payload rotation produced during 

 the deployment test was found to be small and results from variations in static forces. The 

 design of guideline hardware and at-sea handling is discussed. In addition to surface motion 

 compensation, a means for releasing in-line torque must be provided to achieve entanglement- 

 free operations. 



Unclassified 



