On-Bottom stability design

dear expats,

i have following data, pls. help me present the sequence to determine output data. I have done it subject to Dnv RP-305, however, i don't understand how to calculate the Critical phase angle and Pipe submerged weight. it's urgent.

OPERATION CONDITION 100 yr wave 10 yr current
Segment 2 WD= 67.7 m No trench

INPUT DATA Unit
Pipe Data
Line Pipe Specification (API 5L) - X65
Steel Pipe Outer Diameter mm 711.2
Wall Thickness mm 20.60
Steel Pipe Density kg/m3 7850
Inner Lining Thickness mm 0.00
Inner Lining Density kg/m3 0
Ext. Corrosion Coating Thickness mm 3.20
Ext. Corrosion Coating Density kg/m3 940
Internal Corrosion Allowance mm 0.25
Pipe Content Density kg/m3 88.9
Sea Water Density kg/m3 1025
Concrete Coating Thickness mm 45.0
Concrete Coating Density kg/m3 3030

Environmental Data
Minimum Water Depth m 67.03
Significant Wave Height m 6.3
Spectral Peak Period s 10.9
Current Velocity m/s 0.51
Height of Measured Current m 1
Angle of Attack Wave o 90
Angle of Attack Current o 90
Peakness Parameter - 1
Reduction Factor - 1.00
Soil Data
Soil Type - Clay
Grain Size for Silt mm 0.0625
Undrained Shear Strength Clay kPa 4.50

OUTPUT DATA Unit
Environmental Data
Wave Velocity m/s
Ave. Current Velocity m/s
Acceleration m/s2
Critical Phase Angle o
Pipe Data
Pipe Submerged Wt. N/m
Total Outer Diameter mm
SG for Pipe (filled) -
SG for Pipe (empty) -
Safety Factor
Hydrodynamic Force
Lift Force N/m
Drag Force N/m
Inertia Force N/m
Other
Velocity Ratio -
KC Number -
Friction Coeff. -
Calibration Factor -
Breaking Wave -





CL reduction factor - 0.9
CD reduction factor - 0.7
CI reduction factor - 3.29


many thanks for your help,