Offshore marine

operations.
Heavy lifts
Finn Gunnar Nielsen
Norsk Hydro O&E Research Centre
Bergen, Norway
&
NTNU, Department of Marine Technology
 Content

z Examples on Offshore lifting operations

Module lifting
Jacket installation
Installation of sub-sea equipment

z Overview of important issues.

Lift in air versus sub-sea operations
Dynamics
Weather windows statistics

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 Grane jacket, Apr. 2003

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 Grane process module installation, Apr.
2003. Lift-off from barge.

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 Grane process module installation, Apr.
2003. Approaching jacket.

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 Grane process module installation, Apr.
2003. Landing on jacket.

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 Grane process module installation, Apr.
2003. Living quarter.

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 Building-blocks of a process platform

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 Jacket installation,
Self-floater and launching from barge

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 Crane assisted jacket installation

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 Crane assisted jacket installation, side
view

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 Crane assisted jacket installation,
plane view.

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 Tandem lift from barge

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 Fram module lift. Model test setup

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 Fram module. Model testing

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 Installation of Fram West module
The Fram West module (900 tons)
lifted onboard Troll C. May 2003

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 Simulation of Fram module installation

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 Heavy versus light lifts

z Heavy lifts: Coupled dynamics, No heave

compensation, W > 1000 tonnes)

z Light lifts: (Minor coupling, Heave

compensation possible, W <100 tonnes)

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 Example: Saipem7000
Semisubmersible crane and pipelaying (J-lay) DP
vessel

Dimensions:
Length: 198 m
Breadth: 87 m
Depth to main deck: 45 m
Transit draft: 10.5 m
Operational draft: 27.5 m

Ballast system:
Computer controlled system comprising 4 x 6,000
t/h ballast pumps, fully redundant.

Lifting facilities main crane:

Fully revolving. Main blocks tandem lift: 14,000 t
Main block single lift: 7,000 t revolving at 40 m
Aux.1 block: 2,500 t revolving at 74 m rad.
Aux. 2 block: 900 t revolving at 115 m rad.
Lowering capability to 450 m below sea level
Whip hook: 120 t revolving at 150 m rad.

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 Examples on heavy lifts, modules
Module Hook weight (t) Lift date Vessel
Kittiwake deck 6 900 May 90 DB102
(Shell)
Miller M7 (BP) 6 200 July 91 DB102
Piper PUD 10 750 Mar 92 DB102
(EEC)
Gannet deck ( 9 600 Apr 92 DB102
Shell)
Piper WM/DSM 6 825 Apr 92 DB102
(EEC)
Bruce P10 (BP) 8 750 Aug 92 M7000
Bruce P20 (BP) 8 180 Aug 92 M7000
Bruce drill deck 7 520 Aug 92 M7000
(BP)
Saltire deck 10 300 Sept 92 DB102
(EEC)
Tiffany M1 8 140 Nov 92 M7000
(Agip)
Tiffany M2 6 070 Nov 92 M7000
(Agip)
North Everest 8 500 Nov 92 DB102
(Amoco)
Lomond 8 600 Dec 92 DB102
(Amoco)
Scott P1 10 000 Apr 93 DB102
(Amarada)
Scott UQ 8 000 Apr 93 DB102
(Amarada)
East Brae 8 500 Spr. 93 DB102
(Marathon)
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Dunbar (Total) 9 400 Mid 94 DB102 fgn - Date: 2003-09-03 - Page: 21
 Crane assisted jacket installations
Jacket Water depth Hook weight (t) Lift date Vessel
(m)
Veslefrikk 175 9 050 May89 M7000
(Statoil)
Gyda (BP) 66 8 770 Sept 89 M7000
Kittiwake (Shell) 85 5 300 May 90 DB102
Gannet (Shell) 94 7 500 June 91 DB102
Bruce PUQ (BP) 121 9 425 May 92 M7000
Bruce D (BP) 121 7 950 May 92 M7000
Unity (BP) 127 6 500 Jul 92 DB102
Beryl riser 112 5 800 Jul 92 DB102
(Mobil)
Scott JU 141 8 800 Mar 93 DB102
(Amerada)
Nelson (Shell) 84 8 500 Spr. 93 DB102
East Brae 116 9 300 May 93 DB102
(Marathon)
Dunbar (Total) 145 9 100 Mid 94 DB102

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 Installation of subsea equipment,
TOGI 1989

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 Installation of subsea equipment,
Troll pilot

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 Installation of subsea equipment,
Oseberg sr template, 2002.

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 Offshore wind farms

20 x 2MW

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 Offshore wind farms

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 Environmental conditions

Water Depth
1000m

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 Environmental conditions
Appro x im ate 100y r c o nto urline s
22
F a roe a re a
S ig nific ant wave he ig ht, Hmo (m) 20 Ha lte nba nke n
Norte rn North S e a
18 GOM
W OA
16

14

12

10

4
0
2

0
0 5 10 15 20 25 -250
30 Njord
Wav e pe ak pe rio d, Tp(s ) In Troll Schiehallion

-500 ch crea Norne

Foinhaven
all sin
en g
ge
Water Depth (m)

-750 s
Orm en
-1000 Marlin 4 Ram Lange
Pow el
Ursa
-1250
Girassol
Dalia Hoover/Diana
-1500

-1750 Marlin Sul

Roncador Crazy Horse

-2000
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 Weather windows

3 .5
Me a s u re d H
s
H'
3 s

2 .5
H (m )

2
s

1 .5

1
t t t t t
1 2 3 4 5
0 .5
0 10 20 30 40 50 60
T im e (ho urs )

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