21008-BAE-79100-NA-RP-0009_rev02 Gas and Crude Oil Riser Platform Design Report (1)

TITLE : GAS AND CRUDE OIL RISER PLATFORM DESIGN

REPORT

01 AFC 17/06/2011 ITO ZYQ CB Area: 01 Location: FSO-SL Doc Type: RE Rev.

REV DESCRIPTION DATE PRPD CHKD APPD PEC PCSB Discipline: Z Doc No: 0220 Page 1 of 71 2 BAB Document No.: 21008-BAE-79100-NA-RP-0009 Rev. No.: 02 Doc. Status: AFC Vendor Doc. No.: xxxN.Axxx Rev. No.: xxxN.Axxx

SEPAT EARLY PRODUCTION SYSTEM (SEPS)

Contract No. : CHO/2010/DPG/228

Petrofac Job No.: JI-2006

GAS AND CRUDE OIL RISER PLATFORM DESIGN REPORT

DOCUMENT TYPE : REPORT


Area : 01 Location : FSO-SL Doc Type:

Discipline:Z Doc No : 0220 Rev : 2

Page 2 of 20

TABLE OF CONTENTS

1. INTRODUCTION .............................................................................................. 3

2. ANALYSIS MODEL .......................................................................................... 4

2.1 Structural Idealization ........................................................................................................................... 4

2.2 Co-ordinate System ................................................................................................................................ 5

2.3 Boundary Condition ............................................................................................................................... 5

2.4 Load Application .................................................................................................................................... 5

3. ACCEPTANCE CRITERIA ............................................................................... 9

4. ANALYSIS RESULTS .................................................................................... 10

5. CONCLUSIONS ............................................................................................. 11

APPENDICES..................................................................................................... 12

A.1 Model Diagrams ................................................................................................................................... 13

A.2 Model Constraint Diagrams ............................................................................................................... 14

A.3 Loading Diagrams ............................................................................................................................... 15

A.4 Nastran Load Cases ............................................................................................................................. 16

A.5 Structural Responses ........................................................................................................................... 17

A.6 Analysis Result Summary ................................................................................................................... 18

A.7 Riser Platform Drawing ...................................................................................................................... 19

A.8 Ship motion & acceleration ................................................................................................................. 20





Page 3 of 20

1. Introduction

Finite Element structural analysis for the gas and crude

oil riser platform, I-tube riser interface, A-frame and

local ship structure of the FSO SEPAT was carried out

using Femap with NX-Nastran. The purpose of this finite

element analysis is to ensure that the riser platform and

related structures have adequate strength to withstand

the riser installation load, ship motion and maximum

dynamic riser load during the life of FSO.





Page 4 of 20

2. Analysis Model

2.1 Structural Idealization

Structural idealization of the platform, A-frame, local

ship structure, I-tube and its supports is based on

relevant construction drawings shown in Appendix 7 with

considerations as follows:

Finite element model includes

Local ship structure in way of riser platform: Plate

and Bar elements.

.1 longitudinal extent – Fr.64 to 67

.2 transverse extent – C.L to ship side

.3 vertical extent – No.2 Horizontal

girder level (6840mm above B.L) to Main

Deck

A-frame structure on Main Deck. All beam elements.

Riser Platform (beam elements) , I-tube and its

supports (solid elements).

Corrosion Margin of (1.5mm in general) is excluded from

the scantlings.

All existing FSO hull structures are conservatively

assumed to be mild steel with yield stress of

2400kg/cm2.





Page 5 of 20

New structures are also considered made of mild steel

(with yield stress of 2400kg/cm2).

Please refer to Appendix 1 for FE Model Diagrams.

2.2 Co-ordinate System

X axis longitudinal, positive towards bow of FSO

Y axis vertical, positive upward

Z axis transverse, positive towards starboard of FSO

Unit Length – cm Mass – kg Force - kgf

2.3 Boundary Condition

Please refer to Appendix 2 for Model Constraint Diagrams.

Nodes with symbol “Δ” are fixed in all degrees of

freedom.

2.4 Load Application

The loads for the FSO side at the I-tube/BSC interface as

given by detail dynamic analysis result are as follows:

the direction of the bending moment and shear force is towards the FSO side





Page 6 of 20

The following Nastran load cases are created.

Load Case 1

Max PSC, Bending moment (250 kNm = 2548420 kg-cm) and shear force

(100kN = 10194 kg) applied at the lower flange of I-tube while riser

tension (200kN = 20387 kg) on top flange of I-tube.

Load Case 2

Max Tension, Bending moment (200 kNm = 2038736 kg-cm) and shear force

(100kN = 10194 kg) applied at the lower flange of I-tube while riser

tension (400kN = 40775 kg) on top flange of I-tube.

Load Case 3

Pulling force 15MT (15000kg) through top pulley of A-frame for riser

installation.

Load Case 4

Self-Weight of the entire structure. 1*g applied in negative Y-

direction.

Load Case 5

Transverse acceleration 0.55556g* applied in Z direction, towards FSO

side in order to produce worst combination effect with bending and

shear which are towards FSO side

Load Case 6

Longitudinal acceleration 0.1631g* applied in positive X direction

effect of which is too small compare to others and direction of

application is not important.





Page 7 of 20

Load Case 7

Vertical acceleration 0.30071g* applied in negative Y direction in

order to produce worst combination effect with self-weight.

*please refer to Appendix 8 for detail of acceleration calculation.

Load Case 8

Platform live load of 0.05kg/cm2 (=0.5 t/m2) is applied on total

platform area of 109679 cm2 which is evenly distributed on total 368

beam nodes of platform as nodal forces..

Load Case 9

Extreme whether Combination Load Case in which maximum effect out of

the (2) basic riser load cases was selected to combine with self-

weight and worst ship motion inertia effects. In this situation,

platform live load shall be ignored.

1*LC2(max Tension) + 1.05*LC4(self-weight)+ 1*LC5(Transverse accl.) +

1*LC7(Vertical accl.).

Load Case 10

Normal Combination Load Case: Scenario 1

1.05*LC4(self-weight)+ 1*LC5(Transverse accl.) + 1*LC7(Vertical

accl.) + 1* LC8(live load)

Load Case 11

Normal Combination Load Case: Scenario 2





Page 8 of 20

1.05*LC4(self-weight)+ 1*LC6(Longitudinal accl.) + 1*LC7(Vertical

accl.) + 1* LC8(live load)

Please refer to Appendix 3 and 4 for Loading Diagrams and

Nastran Load Cases respectively.





Page 9 of 20

3. Acceptance Criteria

Von Mises stresses obtained from the Finite Element

Analysis are directly used for assessing the adequacy of

structures against failure mode of yielding.

According to ABS Rules for Building and Classing Mobile

Offshore Drilling Units (2008), the yielding criteria for

dynamic & combined loading are

VM ≤ 0.9 Fy (plate & solid elements)

e ≤ 0.8 Fy (beam elements)

where,

VM : Plate/solid Von Mises stress

e : Beam combined stress

Fy : Material yield stress





Page 10 of 20

4. Analysis Results

Analysis results for the various components of the

structure are shown in the Appendix 6 and summarized in

the table below.

Material Mild Steel

Yield Stress 2400 kg/cm2

Allowable VM Stress 2160 kg/cm2

Allowable Beam Stress 1920 kg/cm2

Max VM Stress on Solid 1010 kg/cm2

Max VM Stress on Plate 258 kg/cm2

Max Beam Stress 1284 kg/cm2

Conclusion OK

Appendix 5 contains the 3D contour plots of the structure

for major load cases with Von Mises stress & Beam

combined stresses superimposed on the deflected shape.





Page 11 of 20

5. Conclusions

According to the analysis results, it can be concluded

that the platform, I-tube & supports, A-frame and

adjacent local ship structures have adequate strength to

withstand the winch the riser installation load, ship

motion and maximum dynamic riser load during the life of

FSO.





Page 12 of 20

Appendices





Page 13 of 20

A.1 Model Diagrams

RISER PLATFORM

MODEL DIAGRAM Page 1 of 4

RISER PLATFORM


RISER PLATFORM


RISER PLATFORM






Page 14 of 20

A.2 Model Constraint Diagrams

RISER PLATFORM

CONSTRAINT DIAGRAM Page 1 of 2

RISER PLATFORM

CONSTRAINT DIAGRAM Page 2 of 2





Page 15 of 20

A.3 Loading Diagrams

RISER PLATFORM

LOADING DIAGRAM Page 1 of 4

MAXIMUM PSC CASE (KG, KG-CM)

RISER PLATFORM


MAXIMUM TENSION CASE (KG, KG-CM)

RISER PLATFORM


RISER INSTALLATION

RISER PLATFORM


PLATFORM LIVE LOAD (500 kg/m2)





Page 16 of 20

A.4 Nastran Load Cases

Appendix 4 - Nastran load cases

Load Set 1 - MaxPSCNodal Forces (on Surface)

ID Color Layer Def CS X YZ Phase

1920 10 1 0 10193.68 0.0. 0.

Direction: VectorX = 0. Y = -0.43837 Z = 0.89879

2036 10 1 0 -20387.36 0.0. 0.

Direction: Normal To Surface 2036Load Set 1 - MaxPSCNodal Moments (on Surface)


1920 10 1 0 -2548420. 0.0. 0.

Load Set 2 - MaxTensionNodal Forces (on Surface)


1920 10 1 0 10193.68 0.0. 0.

Direction: VectorX = 0. Y = -0.43837 Z = 0.89879

2036 10 1 0 -40774.72 0.0. 0.

Direction: Normal To Surface 2036Load Set 2 - MaxTensionNodal Moments (on Surface)


1920 10 1 0 -2038736. 0.0. 0.

Load Set 3 - A-frameNodal Forces (on Node)


54 10 1 0 0. -12554.68208.654 0.

54 10 1 0 0. -13213.75-7099.071 0.

Load Set 4 - SelfWeight

Page: 1

Body Loads

Body Loads in Coordinate System 0Acceleration - Translational X 0. Y -1.Z 0.Acceleration - Rotational X 0. Y 0.Z 0.Origin - for Rotations X 0. Y 0.Z 0.

Load Set 5 - T_AcclBody Loads

Body Loads in Coordinate System 0Acceleration - Translational X 0. Y 0.Z 0.55556Acceleration - Rotational X 0. Y 0.Z 0.Origin - for Rotations X 0. Y 0.Z 0.

Load Set 6 - L_AcclBody Loads

Body Loads in Coordinate System 0Acceleration - Translational X 0.1631 Y 0.Z 0.Acceleration - Rotational X 0. Y 0.Z 0.Origin - for Rotations X 0. Y 0.Z 0.

Load Set 7 - V_AcclBody Loads

Body Loads in Coordinate System 0Acceleration - Translational X 0. Y -0.30071Z 0.Acceleration - Rotational X 0. Y 0.Z 0.Origin - for Rotations X 0. Y 0.Z 0.

Page: 2

Load Set 8 - LiveloadLoad Definition 1 - Liveload

Nodal Forces (on Node)ID Color Layer Def CS X Y Z Phase472 10 1 0 0. -14.90204 0. 0.482 10 1 0 0. -14.90204 0. 0.483 10 1 0 0. -14.90204 0. 0.493 10 1 0 0. -14.90204 0. 0.499 10 1 0 0. -14.90204 0. 0.505 10 1 0 0. -14.90204 0. 0.515 10 1 0 0. -14.90204 0. 0.538 10 1 0 0. -14.90204 0. 0.549 10 1 0 0. -14.90204 0. 0.550 10 1 0 0. -14.90204 0. 0.559 10 1 0 0. -14.90204 0. 0.560 10 1 0 0. -14.90204 0. 0.561 10 1 0 0. -14.90204 0. 0.571 10 1 0 0. -14.90204 0. 0.581 10 1 0 0. -14.90204 0. 0.598 10 1 0 0. -14.90204 0. 0.603 10 1 0 0. -14.90204 0. 0.609 10 1 0 0. -14.90204 0. 0.614 10 1 0 0. -14.90204 0. 0.620 10 1 0 0. -14.90204 0. 0.626 10 1 0 0. -14.90204 0. 0.631 10 1 0 0. -14.90204 0. 0.636 10 1 0 0. -14.90204 0. 0.637 10 1 0 0. -14.90204 0. 0.647 10 1 0 0. -14.90204 0. 0.1878 10 1 0 0. -14.90204 0. 0.1879 10 1 0 0. -14.90204 0. 0.1880 10 1 0 0. -14.90204 0. 0.1881 10 1 0 0. -14.90204 0. 0.1882 10 1 0 0. -14.90204 0. 0.1883 10 1 0 0. -14.90204 0. 0.1884 10 1 0 0. -14.90204 0. 0.1885 10 1 0 0. -14.90204 0. 0.1886 10 1 0 0. -14.90204 0. 0.1887 10 1 0 0. -14.90204 0. 0.1888 10 1 0 0. -14.90204 0. 0.1889 10 1 0 0. -14.90204 0. 0.1892 10 1 0 0. -14.90204 0. 0.1893 10 1 0 0. -14.90204 0. 0.1894 10 1 0 0. -14.90204 0. 0.1895 10 1 0 0. -14.90204 0. 0.1896 10 1 0 0. -14.90204 0. 0.1897 10 1 0 0. -14.90204 0. 0.1898 10 1 0 0. -14.90204 0. 0.1899 10 1 0 0. -14.90204 0. 0.1901 10 1 0 0. -14.90204 0. 0.1902 10 1 0 0. -14.90204 0. 0.1903 10 1 0 0. -14.90204 0. 0.1904 10 1 0 0. -14.90204 0. 0.1905 10 1 0 0. -14.90204 0. 0.1906 10 1 0 0. -14.90204 0. 0.1907 10 1 0 0. -14.90204 0. 0.1908 10 1 0 0. -14.90204 0. 0.1911 10 1 0 0. -14.90204 0. 0.1912 10 1 0 0. -14.90204 0. 0.1913 10 1 0 0. -14.90204 0. 0.1914 10 1 0 0. -14.90204 0. 0.1915 10 1 0 0. -14.90204 0. 0.1916 10 1 0 0. -14.90204 0. 0.1917 10 1 0 0. -14.90204 0. 0.1918 10 1 0 0. -14.90204 0. 0.1919 10 1 0 0. -14.90204 0. 0.1920 10 1 0 0. -14.90204 0. 0.1921 10 1 0 0. -14.90204 0. 0.1922 10 1 0 0. -14.90204 0. 0.1925 10 1 0 0. -14.90204 0. 0.1926 10 1 0 0. -14.90204 0. 0.1927 10 1 0 0. -14.90204 0. 0.1928 10 1 0 0. -14.90204 0. 0.1929 10 1 0 0. -14.90204 0. 0.1930 10 1 0 0. -14.90204 0. 0.1931 10 1 0 0. -14.90204 0. 0.1932 10 1 0 0. -14.90204 0. 0.

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2039 10 1 0 0. -14.90204 0. 0.2040 10 1 0 0. -14.90204 0. 0.2041 10 1 0 0. -14.90204 0. 0.2045 10 1 0 0. -14.90204 0. 0.2046 10 1 0 0. -14.90204 0. 0.2047 10 1 0 0. -14.90204 0. 0.2048 10 1 0 0. -14.90204 0. 0.2049 10 1 0 0. -14.90204 0. 0.2050 10 1 0 0. -14.90204 0. 0.2051 10 1 0 0. -14.90204 0. 0.2052 10 1 0 0. -14.90204 0. 0.2055 10 1 0 0. -14.90204 0. 0.2056 10 1 0 0. -14.90204 0. 0.2057 10 1 0 0. -14.90204 0. 0.2058 10 1 0 0. -14.90204 0. 0.2059 10 1 0 0. -14.90204 0. 0.2060 10 1 0 0. -14.90204 0. 0.2061 10 1 0 0. -14.90204 0. 0.2062 10 1 0 0. -14.90204 0. 0.2063 10 1 0 0. -14.90204 0. 0.2064 10 1 0 0. -14.90204 0. 0.2065 10 1 0 0. -14.90204 0. 0.2066 10 1 0 0. -14.90204 0. 0.2069 10 1 0 0. -14.90204 0. 0.2070 10 1 0 0. -14.90204 0. 0.2071 10 1 0 0. -14.90204 0. 0.2074 10 1 0 0. -14.90204 0. 0.2075 10 1 0 0. -14.90204 0. 0.2076 10 1 0 0. -14.90204 0. 0.2077 10 1 0 0. -14.90204 0. 0.2078 10 1 0 0. -14.90204 0. 0.2079 10 1 0 0. -14.90204 0. 0.2080 10 1 0 0. -14.90204 0. 0.2081 10 1 0 0. -14.90204 0. 0.2085 10 1 0 0. -14.90204 0. 0.2086 10 1 0 0. -14.90204 0. 0.2087 10 1 0 0. -14.90204 0. 0.2090 10 1 0 0. -14.90204 0. 0.2091 10 1 0 0. -14.90204 0. 0.2092 10 1 0 0. -14.90204 0. 0.2093 10 1 0 0. -14.90204 0. 0.2094 10 1 0 0. -14.90204 0. 0.2095 10 1 0 0. -14.90204 0. 0.2096 10 1 0 0. -14.90204 0. 0.2097 10 1 0 0. -14.90204 0. 0.2098 10 1 0 0. -14.90204 0. 0.2099 10 1 0 0. -14.90204 0. 0.2100 10 1 0 0. -14.90204 0. 0.2101 10 1 0 0. -14.90204 0. 0.2104 10 1 0 0. -14.90204 0. 0.2105 10 1 0 0. -14.90204 0. 0.2106 10 1 0 0. -14.90204 0. 0.2107 10 1 0 0. -14.90204 0. 0.2108 10 1 0 0. -14.90204 0. 0.2109 10 1 0 0. -14.90204 0. 0.2113 10 1 0 0. -14.90204 0. 0.2114 10 1 0 0. -14.90204 0. 0.2115 10 1 0 0. -14.90204 0. 0.2116 10 1 0 0. -14.90204 0. 0.2119 10 1 0 0. -14.90204 0. 0.2120 10 1 0 0. -14.90204 0. 0.2121 10 1 0 0. -14.90204 0. 0.2122 10 1 0 0. -14.90204 0. 0.2126 10 1 0 0. -14.90204 0. 0.2127 10 1 0 0. -14.90204 0. 0.2128 10 1 0 0. -14.90204 0. 0.2129 10 1 0 0. -14.90204 0. 0.2130 10 1 0 0. -14.90204 0. 0.2131 10 1 0 0. -14.90204 0. 0.2134 10 1 0 0. -14.90204 0. 0.2135 10 1 0 0. -14.90204 0. 0.2136 10 1 0 0. -14.90204 0. 0.2137 10 1 0 0. -14.90204 0. 0.2138 10 1 0 0. -14.90204 0. 0.2139 10 1 0 0. -14.90204 0. 0.2140 10 1 0 0. -14.90204 0. 0.2141 10 1 0 0. -14.90204 0. 0.

2144 10 1 0 0. -14.90204 0. 0.2145 10 1 0 0. -14.90204 0. 0.2146 10 1 0 0. -14.90204 0. 0.2147 10 1 0 0. -14.90204 0. 0.2148 10 1 0 0. -14.90204 0. 0.2149 10 1 0 0. -14.90204 0. 0.2150 10 1 0 0. -14.90204 0. 0.2151 10 1 0 0. -14.90204 0. 0.2154 10 1 0 0. -14.90204 0. 0.2155 10 1 0 0. -14.90204 0. 0.2156 10 1 0 0. -14.90204 0. 0.2157 10 1 0 0. -14.90204 0. 0.2158 10 1 0 0. -14.90204 0. 0.2160 10 1 0 0. -14.90204 0. 0.2161 10 1 0 0. -14.90204 0. 0.2162 10 1 0 0. -14.90204 0. 0.2163 10 1 0 0. -14.90204 0. 0.2164 10 1 0 0. -14.90204 0. 0.2165 10 1 0 0. -14.90204 0. 0.2166 10 1 0 0. -14.90204 0. 0.2168 10 1 0 0. -14.90204 0. 0.2169 10 1 0 0. -14.90204 0. 0.2170 10 1 0 0. -14.90204 0. 0.2171 10 1 0 0. -14.90204 0. 0.2172 10 1 0 0. -14.90204 0. 0.2173 10 1 0 0. -14.90204 0. 0.2175 10 1 0 0. -14.90204 0. 0.2176 10 1 0 0. -14.90204 0. 0.2177 10 1 0 0. -14.90204 0. 0.2178 10 1 0 0. -14.90204 0. 0.2179 10 1 0 0. -14.90204 0. 0.2180 10 1 0 0. -14.90204 0. 0.2181 10 1 0 0. -14.90204 0. 0.2183 10 1 0 0. -14.90204 0. 0.2184 10 1 0 0. -14.90204 0. 0.2185 10 1 0 0. -14.90204 0. 0.2186 10 1 0 0. -14.90204 0. 0.2187 10 1 0 0. -14.90204 0. 0.2188 10 1 0 0. -14.90204 0. 0.2190 10 1 0 0. -14.90204 0. 0.2191 10 1 0 0. -14.90204 0. 0.2192 10 1 0 0. -14.90204 0. 0.2193 10 1 0 0. -14.90204 0. 0.2194 10 1 0 0. -14.90204 0. 0.2195 10 1 0 0. -14.90204 0. 0.2198 10 1 0 0. -14.90204 0. 0.2199 10 1 0 0. -14.90204 0. 0.2200 10 1 0 0. -14.90204 0. 0.2201 10 1 0 0. -14.90204 0. 0.2202 10 1 0 0. -14.90204 0. 0.2205 10 1 0 0. -14.90204 0. 0.2206 10 1 0 0. -14.90204 0. 0.2207 10 1 0 0. -14.90204 0. 0.2208 10 1 0 0. -14.90204 0. 0.2209 10 1 0 0. -14.90204 0. 0.2210 10 1 0 0. -14.90204 0. 0.2211 10 1 0 0. -14.90204 0. 0.2212 10 1 0 0. -14.90204 0. 0.2215 10 1 0 0. -14.90204 0. 0.2216 10 1 0 0. -14.90204 0. 0.2217 10 1 0 0. -14.90204 0. 0.2218 10 1 0 0. -14.90204 0. 0.2219 10 1 0 0. -14.90204 0. 0.2220 10 1 0 0. -14.90204 0. 0.2221 10 1 0 0. -14.90204 0. 0.2222 10 1 0 0. -14.90204 0. 0.2224 10 1 0 0. -14.90204 0. 0.2225 10 1 0 0. -14.90204 0. 0.2226 10 1 0 0. -14.90204 0. 0.2227 10 1 0 0. -14.90204 0. 0.2228 10 1 0 0. -14.90204 0. 0.2229 10 1 0 0. -14.90204 0. 0.2230 10 1 0 0. -14.90204 0. 0.2232 10 1 0 0. -14.90204 0. 0.2233 10 1 0 0. -14.90204 0. 0.2234 10 1 0 0. -14.90204 0. 0.2235 10 1 0 0. -14.90204 0. 0.

2236 10 1 0 0. -14.90204 0. 0.2237 10 1 0 0. -14.90204 0. 0.2238 10 1 0 0. -14.90204 0. 0.2239 10 1 0 0. -14.90204 0. 0.2242 10 1 0 0. -14.90204 0. 0.2243 10 1 0 0. -14.90204 0. 0.2244 10 1 0 0. -14.90204 0. 0.2245 10 1 0 0. -14.90204 0. 0.2246 10 1 0 0. -14.90204 0. 0.2247 10 1 0 0. -14.90204 0. 0.2248 10 1 0 0. -14.90204 0. 0.2249 10 1 0 0. -14.90204 0. 0.2252 10 1 0 0. -14.90204 0. 0.2253 10 1 0 0. -14.90204 0. 0.2254 10 1 0 0. -14.90204 0. 0.2255 10 1 0 0. -14.90204 0. 0.2256 10 1 0 0. -14.90204 0. 0.2259 10 1 0 0. -14.90204 0. 0.2260 10 1 0 0. -14.90204 0. 0.2261 10 1 0 0. -14.90204 0. 0.2262 10 1 0 0. -14.90204 0. 0.2263 10 1 0 0. -14.90204 0. 0.2266 10 1 0 0. -14.90204 0. 0.2267 10 1 0 0. -14.90204 0. 0.2268 10 1 0 0. -14.90204 0. 0.2269 10 1 0 0. -14.90204 0. 0.2270 10 1 0 0. -14.90204 0. 0.2272 10 1 0 0. -14.90204 0. 0.2273 10 1 0 0. -14.90204 0. 0.2274 10 1 0 0. -14.90204 0. 0.2275 10 1 0 0. -14.90204 0. 0.2276 10 1 0 0. -14.90204 0. 0.2277 10 1 0 0. -14.90204 0. 0.2295 10 1 0 0. -14.90204 0. 0.2296 10 1 0 0. -14.90204 0. 0.2297 10 1 0 0. -14.90204 0. 0.2298 10 1 0 0. -14.90204 0. 0.2299 10 1 0 0. -14.90204 0. 0.2300 10 1 0 0. -14.90204 0. 0.2302 10 1 0 0. -14.90204 0. 0.2303 10 1 0 0. -14.90204 0. 0.2304 10 1 0 0. -14.90204 0. 0.2305 10 1 0 0. -14.90204 0. 0.2306 10 1 0 0. -14.90204 0. 0.2324 10 1 0 0. -14.90204 0. 0.2325 10 1 0 0. -14.90204 0. 0.2326 10 1 0 0. -14.90204 0. 0.2327 10 1 0 0. -14.90204 0. 0.2328 10 1 0 0. -14.90204 0. 0.2331 10 1 0 0. -14.90204 0. 0.2332 10 1 0 0. -14.90204 0. 0.2333 10 1 0 0. -14.90204 0. 0.2334 10 1 0 0. -14.90204 0. 0.2335 10 1 0 0. -14.90204 0. 0.2336 10 1 0 0. -14.90204 0. 0.2337 10 1 0 0. -14.90204 0. 0.2338 10 1 0 0. -14.90204 0. 0.2339 10 1 0 0. -14.90204 0. 0.2340 10 1 0 0. -14.90204 0. 0.2341 10 1 0 0. -14.90204 0. 0.2342 10 1 0 0. -14.90204 0. 0.2343 10 1 0 0. -14.90204 0. 0.2344 10 1 0 0. -14.90204 0. 0.2345 10 1 0 0. -14.90204 0. 0.

Load Set 9 – 1.*2 + 1.05*4 + 1.*5 + 1.*7

Load Set 10 –1.05*4 + 1.*5 + 1.*7 + 1.*8

Load Set 11 –1.05*4 + 1.*6 + 1.*7 + 1.*8





Page 17 of 20

A.5 Structural Responses

RISER PLATFORM

STRUCTURAL RESPONSES Page 1 of 9

RISER PLATFORM


RISER PLATFORM


RISER PLATFORM


RISER PLATFORM


RISER PLATFORM


RISER PLATFORM


RISER PLATFORM


RISER PLATFORM






Page 18 of 20

A.6 Analysis Result Summary

Appendix 6 – Analysis Result Summary

Analysis SettingCase : 1..Constraint 1 - MaxPSC

Title : Constraint 1 - MaxPSCBoundary Conditions

Constraints : 1..UntitledLoads : 1..MaxPSC

Case : 2..Constraint 1 - MaxTensionTitle : Constraint 1 - MaxTensionBoundary Conditions

Constraints : 1..UntitledLoads : 2..MaxTension

Case : 3..Constraint 1 - A-frameTitle : Constraint 1 - A-frameBoundary Conditions

Constraints : 1..UntitledLoads : 3..A-frame

Case : 4..Constraint 1 - 1.*2 + 1.05*4 + 1.*5 + 1.*7Title : Constraint 1 - 1.*2 + 1.05*4 + 1.*5 + 1.*7Boundary Conditions

Constraints : 1..UntitledLoads : 9..1.*2 + 1.05*4 + 1.*5 + 1.*7

Case : 5..Constraint 1 - 1.05*4 + 1.*5 + 1.*7 + 1.*8Title : Constraint 1 - 1.05*4 + 1.*5 + 1.*7 + 1.*8Boundary Conditions

Constraints : 1..UntitledLoads : 10..1.05*4 + 1.*5 + 1.*7 + 1.*8

Case : 6..Constraint 1 - 1.05*4 + 1.*6 + 1.*7 + 1.*8Title : Constraint 1 - 1.05*4 + 1.*6 + 1.*7 + 1.*8Boundary Conditions

Constraints : 1..UntitledLoads : 11..1.05*4 + 1.*6 + 1.*7 + 1.*8

Local Adjacent ship structre plating+stiffener stresses

Output Set 1 - NX NASTRAN Case 1Set MAX/MIN Summary Table Set ID ValuePlate Bot VonMises Stress Minimum 1 80638 0.

Maximum 1 47411 106.484Plate Top VonMises Stress Minimum 1 80638 0.

Maximum 1 63091 109.16Bar EndA Max Comb Stress Minimum 1 362516 -112.461

Maximum 1 984 346.259Bar EndA Min Comb Stress Minimum 1 308681 -290.427

Maximum 1 362508 119.867Bar EndB Max Comb Stress Minimum 1 362516 -112.461

Maximum 1 308682 334.923Bar EndB Min Comb Stress Minimum 1 308685 -301.451

Maximum 1 362508 119.867







Maximum 2 362508 284.185







Maximum 3 362504 31.5256







Maximum 4 362508 294.664







Maximum 5 362508 40.9356







Maximum 6 362508 57.5334

Final MAX/MIN Summary Table Set ID ValuePlate Bot VonMises Stress Minimum 1 80638 0.


Maximum 4 63091 255.705

Bar EndA Max Comb Stress Minimum 4 362516 -242.428Maximum 4 984 729.408

Bar EndA Min Comb Stress Minimum 4 633 -716.968Maximum 4 362508 294.664

Bar EndB Max Comb Stress Minimum 4 362516 -242.428Maximum 4 308682 705.816

Bar EndB Min Comb Stress Minimum 4 308874 -721.907Maximum 4 362508 294.664

I-tube & Support Solid Stresses

Output Set 1 - NX NASTRAN Case 1Set MAX/MIN Summary Table Set ID ValueSolid Von Mises Stress Minimum 1 470420 1.03357

Maximum 1 446816 504.064


Maximum 2 446816 1009.63


Maximum 3 494642 1.03803


Maximum 4 446816 1003.72


Maximum 5 466772 95.4751


Maximum 6 500192 103.883

Final MAX/MIN Summary Table Set ID ValueSolid Von Mises Stress Minimum 3 466758 0.00059688

Maximum 2 446816 1009.63

Platform Beam Stresses

Output Set 1 - NX NASTRAN Case 1Set MAX/MIN Summary Table Set ID ValueBeam EndA Max Comb Stress Minimum 1 2069 -68.8641

Maximum 1 1633 533.591Beam EndA Min Comb Stress Minimum 1 1853 -482.504

Maximum 1 1788 87.735Beam EndB Max Comb Stress Minimum 1 2068 -68.8653

Maximum 1 1862 461.823Beam EndB Min Comb Stress Minimum 1 1862 -490.131

Maximum 1 1787 87.735





Maximum 2 1716 164.199





Maximum 3 1672 0.71722


Maximum 4 1633 1284.Beam EndA Min Comb Stress Minimum 4 1853 -1131.67



Maximum 4 1716 177.648





Maximum 5 1689 36.1899





Maximum 6 1716 48.1236

Final MAX/MIN Summary Table Set ID ValueBeam EndA Max Comb Stress Minimum 4 2069 -151.786

Maximum 4 1633 1284.Beam EndA Min Comb Stress Minimum 4 1853 -1131.67



Maximum 4 1716 177.648

A-frame Beam Stresses



Maximum 1 61 -5.09959E-14Beam EndB Max Comb Stress Minimum 1 198 -0.15217


Maximum 1 60 -2.03984E-14





Maximum 2 55 -4.07967E-14





Maximum 3 61 0.





Maximum 4 241 1.13082





Maximum 5 241 1.01967





Maximum 6 242 2.56836

Final MAX/MIN Summary Table Set ID ValueBeam EndA Max Comb Stress Minimum 3 81 -169.796




Maximum 6 242 2.56836





Page 19 of 20

A.7 Riser Platform Drawing

65

7075

65

7075

NO

.1D

EC

KS

TO

RE

NO

.2D

EC

KS

TO

RE

AC

C.

LA

DD

ER

ES

CA

PER

OU

TE

ES

CA

PE

RO

UT

E

ES

CA

PE

RO

UT

E

FR

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FR

.75

FR

.70

SE

PA

TE

AR

LY

PR

OD

UC

TIO

NS

YS

TE

M(S

EP

S)

Petr

ofa

c





Page 20 of 20

A.8 Ship motion & acceleration

15:26

11.06.15

Ship Id: SEPAT RISER PLATFORM

INPUT RESULTS

PITCH motion (Q = 10-8)

L = 219.600 m Period TP = 8.52 s (B500)

B = 32.200 m 98.35 Angle q = 0.09 rad = 5.32 degrees

D = 20.200 m -17.88 Rotation axis xp = 98.82 m from AP

T = 6.500 m 20.20

V = 0.000 kn ROLL motion (Q = 10-8)

CB = 0.800 [ - ] Rule values: Period TR = 12.78 s (B400)

GM = 3.864 m 3.86 Angle f = 0.43 rad = 24.87 degrees

kr = 12.558 m 12.558 Rotation axis zr = 8.30 m above BL

kr

GM ax = 0.52 m/s2

(B301)

Roll damping Wave coefficient: CW = 10.03 ay = 0.87 m/s2

(B302)

Service restriction Acc. parameter: a0 = 0.30 az = 2.28 m/s2

(B303)

Combined accelerations, al & at: Combined, vertical accelerations in CL, av:

At D Custom: B601 B602

Dist. above BL zBL = 20.20 20.20 m At AP 4.73 5.51 m/s2

Transv. roll: (B701) ary = 1.25 1.25 m/s2At L/2 2.55 2.35 m/s2

Long. pitch: (B801) apx = 0.60 0.60 m/s2At FP 5.46 6.54 m/s2

Transv. comb: (B700) at = 5.45 5.45 m/s2Dist.from AP: xAP = 98.345 m 2.55 2.95 m/s2

Long. comb: (B800) al = 1.60 1.60 m/s2Dist from CL: yCL = -17.88 m m/s2

Vertical acceleration, av, at CL [m/s2]

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1 x/L0 21.96 43.92 65.88 87.84 109.8 131.76 153.72 175.68 197.64 219.6 [m]

4.73 4.01 3.28 2.55 2.55 2.55 2.55 3.28 4.01 4.73 5.46 B601

5.51 4.52 3.60 2.83 2.35 2.35 2.83 3.60 4.52 5.51 6.54 B602

Bilge keel

None

Vertical accelerations at CL

0.00

1.00

2.00

3.00

4.00

5.00

6.00

7.00

0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1

x/L

av

[m/s

2]

av, B601

av, B602

Tank or Bulk

Even transv. distr. of mass

DNV Rules

January 1999

Pt.3 Ch.1 Sec.4B

ACCELERATIONS Sign:

Time:

Date:

x =

y =

z =

Single point:

Dist. from CL

Dist. from BL

Dist. from AP

Version 9.00.2 July 2003

DET NORSKE VERITAS

15:26

11.06.15

Ship Id: SEPAT RISER PLATFORM

DNV Rules

January 1999

Pt.3 Ch.1 Sec.4B

ACCELERATIONS Sign:

Time:

Date:Version 9.00.2 July 2003

ACCELERATIONS PARAMETERS According to DNV Rules Pt.3 Ch.1 Sec.4

Identification x [m] y [m] z [m] GM [m] kr [m] Service restriction Roll damping

Tr [s] f [degrees] ary [m/s2] apx [m/s2] at [m/s2] al [m/s2] av_B601 av_B602 [m/s2]

Pos1 115.99 -17.88 20.20 3.86 12.56 None Bilge keel12.78 24.87 1.25 0.60 5.45 1.60 2.55 2.95

Pos2 98.35 -17.88 20.20 3.86 12.56 None Bilge keel12.78 24.87 1.25 0.60 5.45 1.60 2.55 2.95

DET NORSKE VERITAS

Documents

21008-BAE-79100-NA-RP-0009_rev02 Gas and Crude Oil Riser Platform Design Report (1)