Severest sea expected in 

 the area where the mooring 

 system is located 



Various wave spectra in 

 the sea 



Responses to each wave 

 spectrum 



Extreme values of 

 responses 



Extreme wave heights for 

 wave periods critical 

 for the system 



09999 



Figure 1 Approaches for evaluating the extreme 

 value of mooring responses in random seas 



0.5 I 2 4 5 8 10 



SIGNIFICANT WAVE HEIGHT in M, 



0.5 I 2 4 6 8 10 



SIGNIFICANT WAVE HEIGHT in M. 



(a) 



Figure 2 Comparison of distribution for North Sea data 



105 



