Introduction

18
1.0 Introduction Swivel-Ring Flanges allow for easy alignment of bolt holes when making a connection to a standard flange. Consisting of an inner hub that is welded in place and an outer flange ring that is free to rotate, swivel-ring flanges can be installed in many difficult situations. Commonly used in subsea applications, swivel-ring flanges can often be installed by a single diver, which reduces cost and increases safety. In this case, swivel-ring flange is applied on the wall of I-tube. Swivel flange is acting as a connector between bell-mouth and bend stiffener with an angle of 16 degrees. The connection of swivel flange between bell-mouth and bend stiffener is shown in the Figure 1.

TAGS:

description

gaga

Transcript of Introduction

1.0 IntroductionSwivel-Ring Flanges allow for easy alignment of bolt holes when making a connection to a standard flange. Consisting of an inner hub that is welded in place and an outer flange ring that is free to rotate, swivel-ring flanges can be installed in many difficult situations. Commonly used in subsea applications, swivel-ring flanges can often be installed by a single diver, which reduces cost and increases safety. In this case, swivel-ring flange is applied on the wall of I-tube. Swivel flange is acting as a connector between bell-mouth and bend stiffener with an angle of 16 degrees. The connection of swivel flange between bell-mouth and bend stiffener is shown in the Figure 1.

Figure 1

1.1 Purpose of Document

This document collates the result of the structural integrity check of swivel flange while various types of loadings applied on it by Finite Element Analysis (FEA) software, ABAQUS. The hand calculations have performed to access the structural integrity check on swivel flange.

2.0 References

The following documents will be used as the basis for integrity check:

2.1 Project ReferencesNoDescriptionDocument No.

148IN 600 SWIVEL RING FLANGE GENERAL ARRANGEMENT 0812 NOM WTSRF480006A-GAA0812

2Layang - 13in Gas Lift Rise - Option 1-

3Layang - 13in Gas Lift Riser-

Table 12.2 SoftwareSoftwareApplication

ABAQUS 6.14Finite Element Analysis

MathCAD 15.0Analytical Calculations

Autodesk DWG True View 2013Modeling

Table 2

3.0 DESIGN DATA AND CRITERIA

This section presents the design data to be used in the structural integrity check performed by FEA software and analytical calculation.

3.1 System of Units

SI units shall be used for all design work throughout the project. Standardized diameters forpipes may be expressed in inches ( or inch). For flexible pipe, value expressed in inch

3.2Materials

Steel material are selected and used on weld neck fixed flange, swivel flange and I-Tube.

3.3 Steel PropertiesThe mechanical properties at ambient temperature for steel material are presented Table Steel propertyUnitValue

Steel densitykg/m37850

Youngs ModulusMPa200000

Shear ModulusMPa80000

Poissons Ratio-0.30

Table 3

LoadsUnits

Bending Moment (kNm)800

Shear Force (kN)280

Gravity (mm/s2)9810

3.4 Design LoadsThe loads for this integrity check is extracted from Flexible Riser and are described as below.

Bending MomentShear Force

Table 44.0 SUMMARY OF RESULTSA I-Tube system is modeled in FEA ABAQUS. There are three types of I-Tube system were being modeled in FEA ABAQUS and various types of loadings are loaded on the system in order to determine the induced stresses. In this case, the main concern is Von Mises Stress. Multiple I-Tube systems were modeled in FEA ABAQUS are listed as follow:1. I-Tube system (Welded)2. I-Tube system (Bended)3. I-Tube system presented in beam element (For Checking Purpose)Multiple types of loadings were being loaded in the system are listed as follow:1. Bending Moment 800 kNm2. Shear Force 280 kN3. Gravity 9810 mm/s2

4.1 FEA ResultsThe FEA results are extracted from the FEA ABAQUS program and are shown as below. The results will be included the analysis for the I-Tube system under the various loading conditions.

Welded I-Tube System Full Model

I-Tube

Fixed Flange

Swivel Flange

Bended I-Tube SystemFull Model

I-Tube

Fixed Flange

Swivel Flange

Based on the result shown above the induced Von Mises Stress on the bended I-Tube system is lower than the welded I-Tube system. The Induced Von Mises Stress on the bended I-Tube system is 84.48 MPa whereas for the welded I-Tube system is 84.70 MPa while various types of loadings are applied on the system. This result shown that the different of the Von Mises stress induced while various types of loadings applied on the I-Tube systems is 0.22 MPa (0.2%). This different does not bring a huge impact on the system itself. Hence, in this case, the welded I-Tube system is selected instead of the bended system due to fabrication wise. There are quite a number of extra works have to be performed if while fabricating the I-Tube system if the bended I-Tube system is selected. However, the welded I-Tube system do not has a smooth inner surface at the welded part. Therefore, a rubber protection layer has to be inserted into the inner surface of the I-Tube on the welded part in order to prevent scratches happens on the surface of the flexible riser.

4.2 Data ValidationValidity check has been performed in FEA ABAQUS by replacing the I-Tube system with beam element. The result is obtained from FEA analysis and is shown below.

Based on this result, it clearly shown that all the Von Mises stresses are accumulate on the I-Tube while various types of loadings applied on it. The Von Mises stress induced on this beam element is 79.85 MPa uniformly throughout the I-Tube (beam element). This result is used to perform the validity check with the actual model. A different of 4.85 MPa Von Mises stress between the I-Tube (beam element) and the actual model. Hence, we can assume that only 4.85 MPa of Von Mises stress is being absorbed by the fixed flange and swivel flange. Therefore, we can conclude that the fixed and swivel flange that are going to apply on the I-Tube system do not bring a huge impact on the I-Tube system. Although, the self-weight of the flanges are high but the self-weight itself does not induce a huge amount of Von Mises Stress.

4.3 Analytical CalculationAn analytical calculation has performed in MATCAD software in order to validate the maximum Von Mises stress.

The calculated Von Mises stress is slightly less than FEA ABAQUS Von Mises stress. The induced Von Mises stress according to the hand calculation is 81.203 MPa. When comparing the calculated Von Mises stress to the ABAQUS Von Mises stress there is a percentage difference of 4.1 percent. This is fairly accurate and the hand calculation validates the stress at the center of the test specimen.

5.0 ConclusionSwivel flange and fixed flange do not bring much impact on the I-Tube system. The induced Von Mises stress while swivel flange and fixed flange are attached on the I-Tube system is 84.70 MPa for welded I-Tube. This induced Von Mises stress is lesser than the allowable Von Mises stress of the I-Tube system which is (0.67 x 215 MPa) 144.05 MPa. Therefore, we can conclude that our selected swivel flange is applicable on this I-Tube system while various types of loadings are applied on the system. However, there are some precautions needed to be carried out in order to prevent the welded inner surface of the I-Tube break the flexible riser. More research on the selection of the protection layer on the welded part of the I-Tube have to be studied in the future in order to protect the flexible riser.


VisionaryScancombinesarichsetofqualitycontrolandproductivi ... · Introduction Introduction VisionaryScancombinesarichsetofqualitycontrolandproductivityfeatureswithasimpleinterfacedesignedspecificallyforscanningandcodingdepositionexhib-

VisionaryScancombinesarichsetofqualitycontrolandproductivi ... · Introduction Introduction VisionaryScancombinesarichsetofqualitycontrolandproductivityfeatureswithasimpleinterfacedesignedspecificallyforscanningandcodingdepositionexhib-

URBAN STREAM REHABILITATION. INTRODUCTION, OBJECTIVES & IMPACTS INTRODUCTION, OBJECTIVES & IMPACTS INTRODUCTION, OBJECTIVES & IMPACTS INTRODUCTION, OBJECTIVES.

URBAN STREAM REHABILITATION. INTRODUCTION, OBJECTIVES & IMPACTS INTRODUCTION, OBJECTIVES & IMPACTS INTRODUCTION, OBJECTIVES & IMPACTS INTRODUCTION, OBJECTIVES.

Introduction & Strategy Module Introduction & Administrative

Introduction & Strategy Module Introduction & Administrative

introduction | EinlEitung | introduction | introducción · introduction | EinlEitung | introduction | introducción En Description Operation Maintenance Safety instructions dE Benennung

introduction | EinlEitung | introduction | introducción · introduction | EinlEitung | introduction | introducción En Description Operation Maintenance Safety instructions dE Benennung

Introduction: Definition Introduction: Philosophy

Introduction: Definition Introduction: Philosophy

Introduction 1. Introduction

Introduction 1. Introduction

INTRODUCTIONS (LEADS) Creative introduction Action introduction Dialogue introduction Personal introduction Question introduction Quotation introduction.

INTRODUCTIONS (LEADS) Creative introduction Action introduction Dialogue introduction Personal introduction Question introduction Quotation introduction.

CrowPiwithMineCraftPiEdition · 2 CrowPiwithMineCraftPiEdition-Introduction-MinecraftPiEdition-Introduction-Whatyouwillneed-Introduction-RunningMinecraft-Introduction ...

CrowPiwithMineCraftPiEdition · 2 CrowPiwithMineCraftPiEdition-Introduction-MinecraftPiEdition-Introduction-Whatyouwillneed-Introduction-RunningMinecraft-Introduction ...

Introduction and Welcome€¦ · Introduction and Welcome Introduction 4

Introduction and Welcome€¦ · Introduction and Welcome Introduction 4

An Introduction to NSAn Introduction to NS2An Introduction ...teerawat/publications/NS2/02-NS2.pdf · An Introduction to NSAn Introduction to NS2An Introduction to NS2 Textbook: T.

An Introduction to NSAn Introduction to NS2An Introduction ...teerawat/publications/NS2/02-NS2.pdf · An Introduction to NSAn Introduction to NS2An Introduction to NS2 Textbook: T.

General introduction 1.1 Introduction

General introduction 1.1 Introduction

1. INTRODUCTION • INTRODUCTION • EINFÜHRUNG • INLEIDING • INTRODUCCIÓN … · 2016-12-16 · 1. INTRODUCTION • INTRODUCTION • EINFÜHRUNG • INLEIDING • INTRODUCCIÓN

1. INTRODUCTION • INTRODUCTION • EINFÜHRUNG • INLEIDING • INTRODUCCIÓN … · 2016-12-16 · 1. INTRODUCTION • INTRODUCTION • EINFÜHRUNG • INLEIDING • INTRODUCCIÓN

An Introduction for An Introduction for Introduction for ......An Introduction for An Introduction for Introduction for TeachersTeachersTeachers . exChange, Blackburn Cathedral’s

An Introduction for An Introduction for Introduction for ......An Introduction for An Introduction for Introduction for TeachersTeachersTeachers . exChange, Blackburn Cathedral’s

PRODUCT INTRODUCTION Company Introduction

PRODUCT INTRODUCTION Company Introduction

An Introduction to NSAn Introduction to NS2An Introduction to NS2 · 2016. 8. 26. · An Introduction to NSAn Introduction to NS2An Introduction to NS2 Textbook: T. Issariyakul and

An Introduction to NSAn Introduction to NS2An Introduction to NS2 · 2016. 8. 26. · An Introduction to NSAn Introduction to NS2An Introduction to NS2 Textbook: T. Issariyakul and

Introduction to Transducers, Introduction to Transducers ... on... · Introduction to Transducers, Introduction to Transducers, Sensors and ActuatorsSensors and Actuators Introduction

Introduction to Transducers, Introduction to Transducers ... on... · Introduction to Transducers, Introduction to Transducers, Sensors and ActuatorsSensors and Actuators Introduction

Introduction and Thesis Introduction - …...1 Introduction and Thesis Introduction: The introduction relates the topic to the main point of the essay. The introduction is composed

Introduction and Thesis Introduction - …...1 Introduction and Thesis Introduction: The introduction relates the topic to the main point of the essay. The introduction is composed

INTRODUCTION SPECIFICATIONS INTRODUCTION

INTRODUCTION SPECIFICATIONS INTRODUCTION

1. INTRODUCTION INTRODUCTION - Deusto

1. INTRODUCTION INTRODUCTION - Deusto

Introduction Chapitre 1 · Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .

Introduction Chapitre 1 · Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .