Mooring Line Angle 



Fluke/Shank Angle 



Effect of line angle on mooring 

 performance can be significant. 





—I 1 r- 1 



- 



'^ 





c""""''^ "*' 



- 



/, 

 1 1 



II 

 1 1 





/ / 



/^ 















II 





















II 





f / jX 



y 





5/i' 



/■ 



'^ y y 







// 



// / 



''' // 



II /yy 



■y 



y'^ ^J^ 



- 













L X. 





4, JL 



! 



Ho)£n| Capaciry (bpi) 



- Figure shows significance of 

 fluke angle on anchor performance. 



- Optimum angle for mud (=50°) 



- Optimum angle for sand (30-35°) 



Tnt rciulu un an 1 8.000 pound StocLlcu Anchur »-ii! 



Majority of decrease probably 

 attributed to reduction in chain 

 capacity. 



Figure illustrates problem 

 with excessive fluke angle 

 in sand. 



Mooring Line Type (Wire Versus Chain) 



- Overall mooring capacity ~ similar assuming sufficient sediment 

 for complete burial. 



- Anchor penetration in mud significantly less with chain mooring - 

 less sediment required. 



- Anchor drag distance to peak load less with chain mooring - as 

 much as 50 versus 250 ft. 



- Anchor stability requirements greater for wire than chain mooring. 



20 



