Table 1 . Specific Operational Requirements of Cable Burial System 



Threat 



Depth of operation, D (fm) 5 through 1,000 



Depth of burial (ft) 6 if D <20 fm 



3 if D >20 fm 



Environment 



Sea conditions NORMAL SEVERE 



Wind speeds (kt) 11 to 16 40 



Significant wave height (ft) .... 6 to 7.5 12 

 Periods (sec) 



Average 4.8 to 5.4 6.8 



Swell 6.8 to 7.6 9.6 



Average wave lengths (ft) 79 to 99 158 



Currents (kt) 0.2 to 2 5 



Soil Conditions 



Shear strength (psi) 0.18 to 2.2 4 to 7 



Bulk unit weight (pcf) 78 to 116 



Angle of internal friction (deg) .... 30 to 42 — 



Slopes (deg) 5 to 1 20 



Operations 



Speed of advance (kt) >0.5 if D <20 fm 



>1 if D >20 fm 



Cables to be buried: 



Type Caged armor coaxial, 21 



Quad, SF, SD 



Minimum bend radius (ft) 10 (21 Quad) 



Range of sizes — OD (in.) 0.66 to 4.41 



Length of cable run (nm) up to 1,000 



Repeaters to be buried SB repeater SD repeater 



Weight 



in air (lb) - 636 



in water (lb) - 353 



Length (in.) 288 41.5 



Diameter (in.) 6 13 



