ABS-149-2006.pdf
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1、 GUIDANCE NOTES ON SLOSHING AND STRUCTURAL ANALYSIS OF LNG PUMP TOWER APRIL 2006 American Bureau of Shipping Incorporated by Act of Legislature of the State of New York 1862 Copyright 2006 American Bureau of Shipping ABS Plaza 16855 Northchase Drive Houston, TX 77060 USA Copyright American Bureau of
2、 Shipping Provided by IHS under license with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 19:24:59 MDTNo reproduction or networking permitted without license from IHS -,-,- This Page Intentionally Left Blank Copyright American Bureau of Shipping Provided by IHS under license with ABS
3、 Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 19:24:59 MDTNo reproduction or networking permitted without license from IHS -,-,- ABS GUIDANCE NOTES ON SLOSHING AND STRUCTURAL ANALYSIS OF LNG PUMP TOWER . 2006 iii Foreword As the demand for Liquefied Natural Gas (LNG) grows worldwide, the
4、 size of LNG carriers increase and new tank designs emerge. The LNG industry wishes to apply more advanced and technically sound approaches for the structural assessment of the pump tower to ensure that the offered designs meet the requirements. This document provides guidance for applying direct ca
5、lculation procedures for the structural assessment of the pump tower structure. The procedures include ship motion calculation, determination of wave conditions for sloshing simulation, requirements for sloshing analysis, calculation of loads on pump tower structure, finite element analysis procedur
6、e and acceptance criteria for the strength assessment. This approach takes advantage of the principles and the experiences gained from the application of the ABS Dynamic Load Approach (DLA), advances in numerical simulation of the sloshing, and experiences from the structural analysis and evaluation
7、 of tubular structures. In addition to the strength assessment of pump tower structure, the methodology for fatigue and vibration analysis of pump tower structure is also addressed in this document. The requirements for the strength of hull structure of LNG carriers are addressed in the ABS Guide fo
8、r Building and Classing Membrane Tank LNG Vessels. ABS also provides Guidance Notes on Strength Assessment of Membrane-Type LNG Containment Systems under Sloshing Loads. Copyright American Bureau of Shipping Provided by IHS under license with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2
9、008 19:24:59 MDTNo reproduction or networking permitted without license from IHS -,-,- This Page Intentionally Left Blank Copyright American Bureau of Shipping Provided by IHS under license with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 19:24:59 MDTNo reproduction or networking pe
10、rmitted without license from IHS -,-,- ABS GUIDANCE NOTES ON SLOSHING AND STRUCTURAL ANALYSIS OF LNG PUMP TOWER . 2006 v GUIDANCE NOTES ON SLOSHING AND STRUCTURAL ANALYSIS OF LNG PUMP TOWER CONTENTS SECTION 1 Introduction1 1 Background1 3 The Concepts of Pump Tower Analysis Procedure.1 5 Overview of
11、 Sloshing Analysis and Structural Assessment of Pump Tower.2 5.1 Seakeeping Analysis of the Vessel.2 5.3 Selection of Critical Sloshing Wave Conditions.2 5.5 Sloshing Analysis2 5.7 Load Cases for Structural Analysis.3 5.9 FE Analysis of Pump Tower Structure 3 5.11 Acceptance Criteria.3 5.13 Fatigue
12、Analysis3 5.15 Vibration Analysis3 FIGURE 1 Typical Pump Tower Installed in LNG Tank 4 FIGURE 2 Flowchart for Sloshing Analysis and Structural Assessment of Pump Tower5 SECTION 2 Analysis of Ship Motions 7 1 Overview7 3 Environmental Condition7 3.1 Wave Scatter Diagram7 3.3 Wave Spectrum.7 5 Ship De
13、sign Considerations 8 5.1 Operational Condition .8 5.3 Filling Levels .8 5.5 Loading Conditions .9 5.7 Tank Location9 7 Spectral Analysis of Motion and Wave Load.10 7.1 General Modeling Considerations.10 7.3 Diffraction-Radiation Methods and Panel Model.11 7.5 Roll Damping Model11 7.7 Vessel Motion
14、and Tank Acceleration Response Amplitude Operators.11 9 Long-Term Response for Ship Motions.12 Copyright American Bureau of Shipping Provided by IHS under license with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 19:24:59 MDTNo reproduction or networking permitted without license fro
15、m IHS -,-,- vi ABS GUIDANCE NOTES ON SLOSHING AND STRUCTURAL ANALYSIS OF LNG PUMP TOWER . 2006 TABLE 1 Standard Wave Data Recommended by IACS8 FIGURE 1 Definition Sketch of Membrane-Type LNG Tank.9 FIGURE 2 LNG Cargo Holds and No. 2 Tank Location10 SECTION 3 Wave Conditions for Sloshing Analysis13 1
16、 General 13 3 Resonance Sloshing Period 13 5 Sloshing Motion Parameters14 7 Critical Sloshing Wave Condition (CSWC)14 7.1 Equivalent Wave Amplitude.14 7.3 Critical Sloshing Wave Domain (CSWD).15 7.5 Motion Components 15 SECTION 4 Sloshing Analysis17 1 General 17 3 Sloshing Simulation .17 3.1 Require
17、ment for CFD Tool 17 3.3 Validation of CFD Tool 17 3.5 Modeling of LNG Tanks.17 3.7 Mesh Size and Time Stepping.17 3.9 Duration of Simulation.18 3.11 Numerical Results for Pump Tower Analysis.18 FIGURE 1 Modeling of LNG Tank for Two-Dimensional Sloshing Analysis.18 SECTION 5 Loads on Pump Tower 19 1
18、 General 19 3 Sloshing Load19 3.1 Morison Formula .19 3.3 Wave Impact Zone 21 3.5 Shielding Effect .22 5 Inertial loads.22 5.1 Inertial Loads in the FEM Structural Model22 7 Thermal Load and Pump Torque Load22 7.1 Thermal Load22 7.3 Pump Torque.22 9 Load Cases for Pump Tower Structural Analysis23 9.
19、1 Load Cases 1 and 2: Transverse Force on Pump Tower 23 9.3 Load Case 3: Longitudinal Force on Pump Tower 23 9.5 Load Case 4 and 5: Transverse Force on Pump Tower Base Support.24 9.7 Load Case 6: Longitudinal Force on Pump Tower Base Support24 Copyright American Bureau of Shipping Provided by IHS un
20、der license with ABS Licensee=Boeing Co/5910770001 Not for Resale, 08/07/2008 19:24:59 MDTNo reproduction or networking permitted without license from IHS -,-,- ABS GUIDANCE NOTES ON SLOSHING AND STRUCTURAL ANALYSIS OF LNG PUMP TOWER . 2006 vii FIGURE 1 Definition of Length Coordinate and Normal Vec
21、tor.20 FIGURE 2 Typical Fluid Motion in Tank at a Partial Filling Condition20 FIGURE 3 Typical Sectional Force Profiles at Partial Filling Conditions21 FIGURE 4 Simplified Temperature Distribution for Thermal Analysis at Partial Filling Conditions.23 SECTION 6 Structural Analysis of Pump Tower .25 1
22、 General 25 3 Structural Members25 5 3-D Finite element modeling25 5.1 Coordinate System25 5.3 Material Properties25 5.5 Element Types26 7 Boundary Conditions27 TABLE 1 Material Properties of Stainless Steel ASTM A312 Gr. 304L26 FIGURE 1 Cargo Tank Configuration28 FIGURE 2 Plan View of Pump Tower28
23、FIGURE 3 Complete Pump Tower Model .29 FIGURE 4 Stress-Strain Curve for Stainless Steel .30 FIGURE 5 Pump Tower FE Model-Main Section30 FIGURE 6 Pump Tower FE Model Liquid Dome Cover.31 FIGURE 7 Pump Tower FE Model Base Plate.31 FIGURE 8 Boundary Conditions32 FIGURE 9 Schematics of the Sliding Joint
24、s Mounted on the Top Braces.33 SECTION 7 Acceptance Criteria .35 1 General 35 3 Tubular Members.35 3.1 Summary of Criteria for Tubular Members35 3.3 Individual Stresses35 3.5 Members Subjected to Combined Loads38 3.7 Local Buckling.39 5 Tubular Joints 40 5.1 Joint Types40 5.3 Joint Capacity41 5.5 St
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