1. No category

Hva har skjedd siden sist?
Morten Person – ÅSC Deputy Marine Ops. Manager
Haramskonferansen
Brattvåg, Februar 13th 2014
Classification: Internal
2013-11-18
Haramskonferansen 2014
Åsgard Subsea Compression Project
ÅSC, Hva har skjedd siden sist? – Agenda;
- Kort status Åsgard Subsea Compression Februar 2014
- ÅSC Modul håndtering; krav til intervensjon
- Endringer og Modifikasjoner siden 2011 til nå
- Modell testing for å kartlegge krefter
- SHS Status
- Bruk av North Sea Giant & SHS  2018
2
Classification: Internal
2013-11-18
•Åsgard
transport
•Åsgard C
•Åsgard B
•Smørbukk
•Åsgard A
•Smørbukk sør
•Kristin
Partners
Statoil ASA (operator)
34,57 %
Eni Norge AS
14,82 %
Exxon Mobil E&P Norway AS
Petoro AS
Total E&P Norge AS
7,24 %
35,69 %
7,68 %
•Åsgard
transport
to Kårstø
•Midgard
SCSt Sail Away Aker Egersund - 18. Juni 2013
Åsgard Subsea Compression Station
4 - Classification: Internal
2011-11-10
27. Juni 2013
Classif
ication
•5
4. Juli
2013
Classif
ication
•6
Åsgard
B
ÅSC Marine Operations 2013
X
From Yttergryta
S-7000
ÅSG A Mod, SCMS, SCSt
12 Days
Y
Åsgard A
North Sea Giant
Lorelay
Risers, RFO, Spools, Tie-In
Pipelines and PLEMs
215 Days
97 Days
Vessel Days in 2013;
706
Deep Orient
Riser Replacement ÅSG A
92 Days
Olympic Challenger
Tie-in, RFO
88 Days
Z
Rockpiper
Rock Installation
72 Days
Volstad Surveyor
Survey
Hot tap tee
130 Days
From Mikkel
Åsgard B
ÅSC Field Status – Today....
From Yttergryta
X
Subsea Line Legend
Handed over to Drift
(decommissioned)
FCG Completed (Flooded)
Installed (Empty)
Spool Legend
RB-SC-102
Handed over to Drift
Tied-in (not
flushed/leaktested)
Installed (not tied-in)
X-102
To be Installed
Y
Åsgard A
Existing lines/spools
SC-102
Y-105
Y-104
Z-101
Z
SCMS-A
SC-101
Hot tap tee
From Mikkel
Haramskonferansen 2014
Åsgard Subsea Compression Project
ÅSC, Hva har skjedd siden sist? – Agenda;
- Kort status Åsgard Subsea Compression Februar 2014
- ÅSC Modul håndtering; krav til intervensjon & fartøy
- Endringer og Modifikasjoner siden 2011 til nå
- Modell testing for å kartlegge krefter
- SHS Status
- Bruk av North Sea Giant & SHS  2018
9
Classification: Internal
2013-11-18
Åsgard Subsea Compression – BIG THINGS!
Åsgard Subsea Compression – Svære Greier!
Compressor train assembled on cassette base frame
289 tons
12 x 8 x 11 m
235 tons
15 x 10 x 8 m
107 tons
9x6x6m
210 tons
8 x 8 x 12 m
45 tons
5x5x6m
2011-06-14
Availability Requirements
• Availability is MTBF (Mean Time Before Failure) & Repair Time
• For Åsgard, availability is set to ~96% uptime of subsea plant (20 d pr year)
• Means; REPAIR TIME = 5 days response time + 5 d replacement / year
• Means; COMPRESSOR MODULE REPAIR IN Hs = 4.5m
Hs = 4.5m / Hmax = 9m
????????
Are you CRAZZZY?
• Crane operations / heavy structures are normally < 2.5m Hs
• Guided system for modules is required, i.e. Horizontal Forces
• No heavy manned operations at deck, e.g. sea fastening
• Vessel without green water on deck required
• Strong enough modules – Structural Integrity!
Hs = 4.5m / Hmax = 9m
????????
Structural Integrity
• Module Design Criteria in Aker Contract (2010);
• DAF = 2.0 of Submerged weight (Slack Sling Criteria)
• Modules to be designed for Guiding / Handling System (not defined)
• Installation forces to be calculated by Technip (2012)
• North Sea Giant – RAO
• Orcaflex - Irregular waves – DnV «Planning of Marine Operations»
• Model testing  Drag / Added Mass / Slamming Coeffisients
• Aker to verify structural integrity (after modules being built )
• VERY EXITING…………
Results – Installation Criteria @ Structural Integrity
Inlet Cooler Module
Compressor Module
+ 4 more
~2.5 m Hs 
~4.5 m Hs  
15 x 10 x 8 m
240 Tons
12 x 8 x 11 m
289 Tons
16
Classification: Internal
2012-01-03
Haramskonferansen 2014
Åsgard Subsea Compression Project
ÅSC, Hva har skjedd siden sist? – Agenda;
- Kort status Åsgard Subsea Compression Februar 2014
- ÅSC Modul håndtering; krav til intervensjon
- Endringer og Modifikasjoner siden 2011 til nå
- Modell testing for å kartlegge krefter
- SHS Status
- Bruk av North Sea Giant & SHS  2018
17
Classification: Internal
2013-11-18
NSG & SHS - Interim Intervention Solution
•
Built in 2011
•
World largest Construction vessel in
its class – 160 x 30m
•
DP3 capabilities
•
Large deck space (2900 m2)
•
400 and 50 Tons cranes
•
Voith Schneider Propulsion
Hva har skjedd siden sist?
Axtech konsept – Tilbud, sent 2011
Kompressor vekt;
150t
SHS Høyde;
24m
19
Classification: Internal
2013-11-18
Contract Award, 2Q2012
Kompressor vekt;
220t
SHS Høyde;
28m
Hva har skjedd siden sist?
3 moduler pr. tur, 3Q2012
Kompressor vekt;
290t
SHS Høyde;
35m
20
Classification: Internal
2013-11-18
2 moduler pr tur, 4Q2012
Kompressor vekt;
290t
SHS Høyde;
33m
Hva har skjedd siden sist?
Optimalisert “Palle Ramme”, 2013
Våt parkering av “syk” modul
Kompressor vekt;
290t
SHS Høyde;
30m
21
Classification: Internal
2013-11-18
Hva har skjedd siden sist?
30m
Ramme
24m
Palle
Axtech konsept – Tilbud, sent 2011
Kompressor vekt;
150t
SHS Høyde;
24m
22
Classification: Internal
2013-11-18
Optimalisert “Palle Ramme”, 2014
Kompressor vekt;
290t
SHS Høyde;
30m
Optimised Seafasten & Grillage Skids
Inlet
Cooler
Compressor
Spool Interface
Discharge Cooler
Scrubber
CPDU
Haramskonferansen 2014
Åsgard Subsea Compression Project
ÅSC, Hva har skjedd siden sist? – Agenda;
- Kort status Åsgard Subsea Compression Februar 2014
- ÅSC Modul håndtering; krav til intervensjon
- Endringer og Modifikasjoner siden 2011 til nå
- Modell testing for å kartlegge krefter
- SHS Status
- Bruk av North Sea Giant & SHS  2018
24
Classification: Internal
2013-11-18
Conclusive Model Testing
Model Testing – Campaign 1
 Forced Oscillation and
Slamming Tests in
Calm Water
 Definition of the
hydrodynamic
coefficients to be
used in the analysis
 Led to a significant
reduction in the drag
loads compared to
previous analysis
based on DNV
coefficients
25
Classification: Internal
2013-11-18
Model Testing – Campaign 2
 Fixed Modules in Regular
Waves with and without
current
 Study of the wave loads
during the splash zone
crossing
 Little influence of wave
period and current, less
conservative estimation of
slamming
 Realization of the same setup
in OrcaFlex and SIMO show
good agreement and
conservatism in the peak
loads
Conclusive Model Testing
Model Testing – Campaign 3
 Vessel in Irregular Waves - SHS and Moonpool
 Estimation of loads in scenarios closer to reality
 The loads from analysis (used in the structural
design) are proved to be on the safe side
 The scales effects are
verified to be acceptable
(1:30 vs. 1:10)
 No green water on deck,
some spray
26
Classification: Internal
2013-11-18
Conclusive Model Testing
 Compressor module: 11m x 7.6m x 10.8m (L x W x H)
 300Te (installation mass)
 333Te (retrieval mass)
 Load reduction in Hs 4.5m (from DNV approach vs. Model testing
results)
DNV
calculation
Max. Longitudinal force (Te)
370
Max. Lateral force (Te)
97
Max. Vertical force (Te)
676
27
Classification: Internal
2013-11-18
Model test Load Reduction
188
49 %
55
43 %
512
24 %
Conclusive Model Testing
Moon Pool Modules
 Pump
 Pump Trafo
 CPDU Trafo
 MEG Module
 SCM
 Tool Baskets
 Sliding Spools
28
Classification: Internal
2013-11-18
Conclusive Model Testing
Moon Pool Pump Module
 Significant reduction in forces
in model testing results
compared to DNV results in
moonpool. (use of Orcaflex
based on DNV
recommendations)
Max shear
Max shear force force –
Module Elevation Model testing
Orcaflex (DNV)
kN
kN
Half below Hull
Below Hull
29
Classification: Internal
70,6
69,1
2013-11-18
192,4
139,6
 Pump Installation Mass = 48t
 Maximum vertical forces on the Pump
module (with 10% contingency) is 62t
 “DAF” = 1.29 (in Hs 4.5m)
Haramskonferansen 2014
Åsgard Subsea Compression Project
ÅSC, Hva har skjedd siden sist? – Agenda;
- Kort status Åsgard Subsea Compression Februar 2014
- ÅSC Modul håndtering; krav til intervensjon
- Endringer og Modifikasjoner siden 2011 til nå
- SHS Status
- Bruk av North Sea Giant & SHS  2018
30
Classification: Internal
2013-11-18
SHS Fabrication status
February 13th 2014
SHS Weights
King Post
105t
Superstructure 380t
2 x MLWs
172t
Misc
45t
Tools
110t
TOTAL
812
SHS Dimensions
Height
30m
Swing Radius 13m
Width
18m
SHS – Special Handling System, verdens råeste! Pr 04.01.14
32
Classification: Internal
2013-10-22
SHS Machining, +/- 0.02 mm
33
Classification: Internal
2013-11-18
Marine Ops - Pictures
34
Classification: Internal
2012-02-19
NSG at Fayard (Lindø / Odense Ståværft)
35
Classification: Internal
2012-02-19
Fayard (Lindø / Odense Ståværft)
36
Classification: Internal
2012-02-19
Marine Ops - Pictures
37
Classification: Internal
2012-02-19
Haramskonferansen 2014
Åsgard Subsea Compression Project
ÅSC, Hva har skjedd siden sist? – Agenda;
- Kort status Åsgard Subsea Compression Februar 2014
- ÅSC Modul håndtering; krav til intervensjon
- Endringer og Modifikasjoner siden 2011 til nå
- Modell testing for å kartlegge krefter
- SHS Status
- Bruk av North Sea Giant & SHS  2018
38
Classification: Internal
2013-11-18
NSG – SHS & MHS operation modus
North Sea Giant will in the Option period perform
– Module Intervention – appr. 30 days / year
– Then, she has to work the remaining 335 days
The SHS will occupy less than 1/3 of the 3.000 m2 aft working deck
NSG w/ SHS will be an extremely powerfull Subsea Construction Vessel
– SHS; 300t Modules
– SHS; Other structures such as Suction Anchors
– 400t AHC Main crane
– 800t twin lift SHS – Main Crane, e.g. lift out old subsea structures
– 50 AHC Anxillary crane
– MHS for modules up to 60t – deployment in Hs 4.5m
– Large / Heavy Spools
39
Classification: Internal
2013-11-18
NSG – MHS & MHS operation modus
400t AHC
Vast space
below deck
2.000 m2
50t AHC
400t AHC
NSG Free Deck Area
Construction Modes
Deck
Demob
• Clean Deck
3.000m2
• Light Construction
Small
Quick
• MHS
2.500m2
• Spools & Tie-In
Large
Quick
• SHS & MHS
2.000m2
• RFO & Grouting
Large
Slow
• SURF
Large
Slow
40
Classification: Internal
2013-11-18
NSG – MHS operation modus
«Small» Modules
W < 60t
Size < 6x6x6 m
Pump
Pump Trafo
CPDU Trafo
MEG Module
SCM
Tool Baskets
Sliding Spools
X-Tree
41
Classification: Internal
2013-11-18
SHS – Some Breakthroughs
 HPU Pack below deck
 Modular control cabin, below bridge, port side
 MHS together with SHS (small modules & tools)
 No skidding of large modules (safety, deck strength)
 Subsea Process Intervention System (SPIS)

Awarded to IKM Testing, Stavanger

Direct Contract IKM – Statoil

Modular system – no vessel integration
 No Shallow Water Test
42
Training in Simulator

Awarded to Offshore Simulation Centre (OSC)

Direct Contract OSC – Statoil

Testing & Optimizing offshore procedures

Training operators and crew
Classification: Internal
2013-11-18
SPIS = Subsea Process Intervention System
• Glycol flushing (MEG) of Hydro Carbons (HC) in the subsea process/piping system
• Nitrogen purging and HC gas freeing of the subsea compressor and pump modules
• Leak testing of connections prior to and after replacement of subsea modules
43
Classification: Internal
2013-11-18
Thank you!