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Concrete Coating Thickness Calculation INTRODUCING DNV RP E305 ON BOTTOM STABILITY PVE Nguyen Minh Trung Concrete Coating Thickness Calculation DNV RP E 305 Design Data Load Case Methodology Design, organize, and collaborate PVE Nguyen Minh Trung Concrete Coating Thickness Calculation DESIGN DATA Collect Information PVE Nguyen Minh Trung DESIGN DATA Concrete Coating Thickness Calculation PVE PIPELINE PARAMETER OUTSIDE DIAMETER MINIMUM FLUID DENSITY WALL THICKNESS CORROSION COATING WEIGHT COATING DENSITY Nguyen Minh Trung DESIGN DATA Concrete Coating Thickness Calculation PVE ENVIRONMENT DATA GEOTECHNICAL DATA GEOPHYSICAL DATA WATER DEPTH TIDAL STORM SURGE CURRENT VELOCITY (1 Yr, 10 Yr, 100 Yr) WAVE Significant Wave Height (Hs) Spectral Peak Period (Tp) SAND SOIL GRAIN SIZE UNDRAIN SHEAR STRAIN Nguyen Minh Trung Concrete Coating Thickness Calculation Load Case DNV RP E305 PVE Nguyen Minh Trung Concrete Coating Thickness Calculation LOAD CASE INSTALLATION CONDITION 10 YR WAVE + YR CURRENT PVE OPERATING CONDITION YR WAVE + 10 YR CURRENT 100 YR WAVE + 10 YR CURRENT 10 YR WAVE + 100 YR CURRENT Nguyen Minh Trung Concrete Coating Thickness Calculation METHODOLOGY DNV RP E305 PVE Nguyen Minh Trung Concrete Coating Thickness Calculation DNV RP E305 METHODOLOGY DYNAMIC ANALYSIS GENERALISED STABILITY ANALYSIS SIMPLIFIED STABILITY ANALYSIS DESIGN CRITERIA ON BOTTOM STABILITY PVE Vertical: (WS+B)/B=1.1 Lateral: [WS/FW - FL]m ≥ FD+FI Nguyen Minh Trung DESIGN METHOD Concrete Coating Thickness Calculation PVE 10 Nguyen Minh Trung Concrete Coating Thickness Calculation GENERAL CALCULATION PVE 11 Nguyen Minh Trung Concrete Coating Thickness Calculation WAVE CALCULATION d: Water Depth TP: Spectral peak period of surface spectrum HS: Significant wave height US*: Significant velocity perpendicular to the pipe Determine US: U S = U S* x R (Page 9) Where: US: Significant velocity perpendicular to the pipe R: Reduction factor Figure 2.1: Significant Water Velocity PVE 12 Nguyen Minh Trung Concrete Coating Thickness Calculation WAVE CALCULATION TP: Spectral peak period of surface spectrum TU: Mean Zero Up Crossing Period Keulegan - Carpenter number K = (Us.Tu)/Dt Significant acceleration AS = 2π.US/TU (page 28) Current & Wave velocity ratio M = U C / US Figure 2.2: Zero-Up-Crossing Period PVE 13 Nguyen Minh Trung Concrete Coating Thickness Calculation CALIBRATION FACTOR Figure 5.12: Calibration Factor FW as function of K and M PVE 14 Nguyen Minh Trung Concrete Coating Thickness Calculation FRICTION FACTOR Figure 5.11: Recommended Friction factor m PVE 15 Nguyen Minh Trung Concrete Coating Thickness Calculation CURRENT CALCULATION Where: Ur = UD = z = z0 = zr = PVE Near Bottom Current Velocity Average velocity over pipe diameter Elevation above seabed Bottom roughness parameter Reference height above seabed 16 Nguyen Minh Trung Concrete Coating Thickness Calculation HYDRODYNAMIC LOAD PVE 17 Nguyen Minh Trung Concrete Coating Thickness Calculation Required Submerge Weight Sufficient to Environment Load PVE Submerge Weight Based on Initial Concrete Thickness 18 Nguyen Minh Trung Concrete Coating Thickness Calculation WAVE THEORY PVE • Airy : Most appropriate for small wave amplitudes where linear (1st order) theory applies It may also be applicable for large amplitudes for pipes at sea bottom • Stokes: This is Stokes 5th order Can be used for larger wave heights and is applicable for stokes waves up to 5th order • Stream: Can be used for very high amplitude and breaking waves up to 10th order • Current: Restricts wave loading to current effects only No wave action In this case, wave period and height are not used, but water depth is used to limit the current data to points above sea bottom 19 Nguyen Minh Trung Concrete Coating Thickness Calculation WAVE THEORY PVE 20 Nguyen Minh Trung SPECTRAL DENSITY Concrete Coating Thickness Calculation SPECTRAL DENSITY FREQUENCY TRANSFER FUNCTION SPECTRAL MOMENTS OF ORDER n SIGNIFICANT FLOW VELOCITY AMPLITUDE AT PIPE LEVEL REDUCTION FACTOR LINEAR WAVE THEORY PVE MEAN ZERO UP-CROSSING PERIOD 21 Nguyen Minh Trung Concrete Coating Thickness Calculation DNV RP E305 ? QUESTION… THANK YOU FOR YOUR ATTENTION! PVE 22 Nguyen Minh Trung
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