Post on 30-Sep-2020
PTIL/PSA
IN SERVICE EXPERIENCES WITH SHIP-SHAPED
FLOATING PRODUCTION UNITS
Marita Halsne, Narve Oma, Gerhard Ersdal, Arne
Kvitrud, Roger L. Leonhardsen, Morten Langøy, Terje
Andersen, Lars G. Bjørheim
OMAE2020-19287
PTIL/PSA
A report on the Norwegian FPSO and FSO fleet
0
2
4
6
8
10
12
14
20
00
20
01
20
02
20
03
20
04
20
05
20
06
20
07
20
08
20
09
20
10
20
11
20
12
20
13
20
14
20
15
20
16
20
17
20
18
20
19
Total number of FPSOs and FSOs on NCS: 17
Current number for FPSOs and FSOs on NCS: 13
Pictures from: Oma, N. Presentation at PSA’s seminar 2006
PTIL/PSA
Differences between FPSOs, FSOs and tankers
Pictures from Teekay
PTIL/PSA
Reported incidents from 2000 - 2019
Incidents Number of incidents sinceyear 2000
Cracks 494
Green sea 4
Stability 3
Mooring line failure 6
PTIL/PSA
Crack prone areas on FPSOs and FSOs
Structural connections important for the integrity of global and local strength:
• Moonpool area in main deck and bottom.
• Inner- and outer knuckellines.
• Bracket termination of midship section.
• Termination of stringers and longitudinals.
• Termination of cross-ties.
• Cut outs with penetrations in main deck.
• Top side support towards main deck (stools).
• Disconuity of bilge keel, main deck and bottom plate.
• Block joints
DNVGL og TSCF
PTIL/PSA
Cracks in FPSOs and FSOs.
WBT Cargo WBT/Cargo Void Bow Deck
0
20
40
60
80
100
120
20
00
20
01
20
02
20
03
20
04
20
05
20
06
20
07
20
08
20
09
20
10
20
11
20
12
20
13
20
14
20
15
20
16
20
17
20
18
20
19
Insignificant Minor Major
CRACKS ON ALL 17 PRODUCTION UNITS
GIVEN BY LOCATIONS OF THE CRACKS.
THE CRACK AS CLASSIFIED INTO CLASSES OF SEVERITY
PER ANNUM ON ALL 17 PRODUCTION UNITS ON THE NCS
IN THE PERIOD 2000-2019.
PTIL/PSA
Definition of cracks of major severity
.
Pictures from: Oma, N. Presentation at PSA’s seminar 2006
PTIL/PSA
Definition of cracks of minor severity
Pictures from: Oma, N. Presentation at PSA’s seminar 2006
PTIL/PSA
Definition of cracks of insignificant severity
Pictures from: PSA database
PTIL/PSA
Green sea incidents
Photo: Per Meidel fra boken “Belastninger på skip” av Carl A Carlsen
PTIL/PSA
Mooring and heading control
PTIL/PSA
Stability incidents
Photo: Associated Press
PTIL/PSA
Conclusion
Crack in bilge keel Crack in deck longitudinal
Pictures from: Oma, N. Presentation at PSA’s seminar 2006