Turret Mooring Loads Application

8/10/2019 Turret Mooring Loads Application

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Preliminary Turret Mooring Loads Provided by SBM

Case

Concomitant valuesWave Heading

Fr Mr Fz FPSO Heading

[kN] [kNm] [kN] [Degrees] [Degrees] [Degrees]

LC99_510 000 ALS

Maximum Fr 88,587 599,756 -53,347 317 100 255

Maximum Mr 88,551 607,964 -56,738 322 96 255

Maximun Fz 48,965 489,371 -87,138 141 286 90

LC99_5200 ULS

Maximum Fr 28,342 194,403 -34,959 110 215 135

Maximum Mr 23,338 199,282 -36,699 130 273 105

Maximun Fz 11,607 117,089 -42,561 126 265 105

LC99_310 000 ALS

Maximum Fr 90,924 613,317 -49,627 317 100 255

Maximum Mr 67,845 618,505 -77,700 151 315 90

Maximun Fz 65,011 613,406 -95,505 138 272 90

LC99_3200 ULS

Maximum Fr 30,116 195,057 -33,155 125 205 150

Maximum Mr 22,353 204,501 -40,457 115 283 90

Maximun Fz 18,172 171,157 -45,386 115 277 90

Preliminary Information by SBM

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Clarification Items for Turret Mooring Loads Application

- Please confirm current mooring loads are only dynamic components at chain table level without

load factor excluding Turret/mooring weight, inertia loads and Hull deformation components

- Which sea states were investigated for the given mooring loads derivation? (Page 4 and 5)

- Please confirm whether current mooring loads are maximum cases in all sea states requested by

CPY and no other maximum case exceeding these loads can occur

- Please correct FSOB understanding for the conceptual sketch of wave/mooring load/FPSO direction

presented in Page 6 and 7 as per the information of Page 1.

- FSOB to proceed analysis with conservative approach using Max. Fr, Max. Mr and Max. Fz for eachBallast/Full load condition with assumed mooring load direction as shown in Page 8. In this regard,

please confirm possible mooring load angle (alpha) range (Is it possible alpha can be within 90 deg

~ 270 deg in each of Max. Fr / Max. Mr / Max. Fz cases?)

- For the confirmation of usefulness of simplified Turret model idealization, comparison of reaction

loads for simplified Turret and complete Turret model cases are necessary as per CPY request atthe interface nodes on Tanker insert top/bottom. FSOC is kindly requested to provide reaction

loads when only given mooring loads (Page 1) are applied to complete Turret and recently given

Hull model (net scantling model).

- Please clarify the deviation revealed between DSME and SBM results shown in Page 9

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Coordinate Definition

FPSO Heading

North

Concept of SBM

Wave Heading

North

Concept of DSME

Wave Heading

No

rth

FPSO Heading

Nor

th

WADAM

=FPSO Heading

Wave Heading +180

WADAM

=Wave Heading

FPSO Heading

Case #Wave

Heading

FPSO

Heading

WADAM

Heading

1 45 45 180

2 30 0 150

3 330 30240

(-120)

Case #Wave

Heading

FPSO

Heading

WADAM

Heading

1 45 45 0

2 30 0 30

3 330 30 300

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By-Octant Metocean Data (200 YR)

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By-Octant Metocean Data (10,000 YR)

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Wave Heading :

255 clockwise

FPSO

FPSO Heading :

317clockwise

North

Mooring Force :

100 c-clockwise

Full Load (LC99_5) 10K ALS

Wave Heading :

90 clockwise

FPSO

FPSO Heading :

141clockwiseMooring Force :

286 c-clockwise

North

Wave Heading :

255 clockwise

FPSO

FPSO Heading :

322clockwise

North

Mooring Force :

96 c-clockwise

Max. Fr Case Max. Mr Case Max. Fz Case

Wave Heading :

135clockwise

FPSO

FPSO Heading :

110clockwise

North

Mooring Force :

215 c-clockwise


Wave Heading :

105clockwise

FPSO

FPSO Heading :

130clockwise

North

Mooring Force :

273 c-clockwise

Wave Heading :

105clockwise

FPSO

FPSO Heading :

126clockwise

North

Mooring Force :

265 c-clockwise

Full Load (LC99_5) 200 ULS

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Wave Heading :

255 clockwise

FPSO

FPSO Heading :

317clockwise

North

Mooring Force :

100 c-clockwise

Ballast (LC99_3) 10K ALS

Wave Heading :

90 clockwise

FPSO

FPSO Heading :

151clockwise

North

Mooring Force :

315 c-clockwise

Max. Fr Case Max. Mr Case

Wave Heading :

150clockwise

FPSO

FPSO Heading :

125clockwise

North

Mooring Force :

205 c-clockwise


Wave Heading :

90clockwise

FPSO

FPSO Heading :

115clockwise

North

Mooring Force :

283 c-clockwise

Ballast (LC99_3) 200 ULS

Max. Fz Case

Wave Heading :

90clockwise

FPSO

FPSO Heading :

138clockwise

North

Mooring Force :

272 c-clockwise

Wave Heading :

90clockwise

FPSO

FPSO Heading :

115clockwise

North

Mooring Force :

277 c-clockwise

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Turret Mooring Loads Application

Fr Mr Fz FPSO Heading

[kN] [kNm] [kN] [Degrees] [Degrees] [Degrees] [Degrees]

Maximum Fr 88,587 599,756 -53,347 317 100 255 242

Maximum Mr 88,551 607,964 -56,738 322 96 255 247

Maximun Fz 48,965 489,371 -87,138 141 286 90 231

Maximum Fr 28,342 194,403 -34,959 110 215 135 155

Maximum Mr 23,338 199,282 -36,699 130 273 105 205

Maximun Fz 11,607 117,089 -42,561 126 265 105 201

Maximum Fr 90,924 613,317 -49,627 317 100 255 242

Maximum Mr 67,845 618,505 -77,700 151 315 90 241

Maximun Fz 65,011 613,406 -95,505 138 272 90 228

Maximum Fr 30,116 195,057 -33,155 125 205 150 155

Maximum Mr 22,353 204,501 -40,457 115 283 90 205

Maximun Fz 18,172 171,157 -45,386 115 277 90 205

WADAM

Heading

LC99_3

200 ULS

Case

Concomitant valuesWave Heading

LC99_5

10 000 ALS

LC99_5

200 ULS

LC99_3

10 000 ALS

Load Case A (Head Sea) MF : 0 deg

Load Case B (Oblique Sea)

-Ballast condition-Full load condition

MF : +/-45 deg

Load Case C (Oblique Sea) MF : +/-90 deg

Load Case B (Oblique Sea)

-Intermediate condition

MF : +/-135 deg

Following mooring load cases to be applied in the analysis

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Clarification for Mooring Loads Only Case

Deviation revealed between DSME and SBM results in interface load report

Turret Integration Interface Load Report (S880-AS-DAT-10000 Rev.A)

Simplified turret model used

Applied Forces (Mooring Loads Only)

Reaction Forces

Total Forces (Unbalanced Forces)

Fr Max Fz Max Mr Max Fr Max Fz Max Mr Max

FX 23761 15302 25955 102906 8237 103138

FZ - 29651 - 51303 - 34755 - 49023 - 95753 - 52888

MY 123622 93053 177157 541293 113768 567861

Mooring

Point

Position Direction

Applied Force (kN, kNm)

ULS ALS


FZ 42048 51298 45238 135236 95751 136231

MY 320441 274784 336273 1118224 236969 1120844

FX -11571 - 7190 -12617 -50757 -3327 - 50838

FY 11 18 15 43 45 40

FX 0 0 0 0 0 0

FY 0 0 0 0 0 0

Radial

Wheels

Axial

Bogies

Position Direction

Reaction Force (kN, kNm) - SBM

ULS ALS

Lower

Pads


FZ 29651 51303 34755 49025 95753 52889

MY 270531 269605 301320 463996 81418 491916

FX -13071 - 15302 -17314 -12229 - 8237 -15562

FY -6 0 -6 -39 0 -48

FX -10690 0 -8641 -90680 0 -87578

FY 6 0 6 39 0 48

Direction

Reaction Force (kN, kNm) - DSME

ULS ALSPosition

Axial

Bogies

Radial

Wheels

Lower

Pads


FX 0 0 0 -3 0 -2

FZ 0 0 0 2 0 1

MY 22 4 -42 -7 -32 -39

Mooring

Point

Position Direction

Unbalance Force (kN, kNm) - DSME

ULS ALS


FX 12190 8112 13338 52149 4910 52300

FZ 12397 -5 10483 86213 -2 83343

MY 169827 197433 214398 456566 271877 483838

Position Direction

Unbalance Force (kN, kNm) - SBM

ULS ALS

Mooring

Point

Where these unbalanced forces come from?

Turret Mooring Loads Application

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