a long journey in offshore and marine technology

DNV GL © 2013 SAFER, SMARTER, GREENER DNV GL © 2013

A long journey in Offshore and Marine Technology

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By Dr. Arne Edvin Løken

DNV GL © 2013

CONTENT OF PRESENTATION

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INTRODUCTION

First of all I want to congratulate Professor Faltinsen and Professor Moan with their 70

years birthdays and this NTNU Honor celebration seminar .

Both Dr. Moan and Dr. Faltinsen have made unique top notch world class contributions

to the field of Offshore and Marine Technology.

I sincerely thank you for the honor of being invited to make this speech .

During my more than 45 years for DNV now DNV GL it has been a long journey with a lot of

things going on.

First I will spend some time to give a brief overview of what I have been doing up to now

and the impact I got from working with Dr. Faltinsen over some very interesting years .

Then I will spend the rest of the time on one project I worked on in Texas (GOM) . This

the BP-HOLSTEIN PROJECT was the most hectic and most rewarding job ever .

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STARTING POINT OF EXPERIENCE

When I started in DNV (1967)I worked a few years with experimental mechanics and

structural analysis of machine and structural components . This was components such as

crank shafts ,crank rods and structural details of ships and spherical LNG tankers .

I then got the opportunity in DNV (1971) to move into hydrodynamics and statistical

prediction of wave induced loading of ships and offshore structures doing a lot of software

development and computer analysis..

It so happened that I as a young engineer was selected to work with Dr. Faltinsen as his

assistant from the beginning of the seventies in DNV on quite some groundbreaking

hydrodynamic projects. This quite close cooperation continued for some years also after

Dr. Faltinsen joined NTH (now NTNU) as a Professor in 1974.

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EXPERIENCE WORKING WITH DR. FALTINSEN

The topics I worked with Dr. Faltinsen on was 3D wave diffraction/radiation methods to

compute wave induced motions and loads as well as wave drift forces on offshore

structures.

Work was also carried out by using strip theory to compute wave drift forces and slowly

varying second order forces on ships.

Dr. Faltinsen in this period made a huge impact on my following career in terms of being a

very enthusiastic supervisor and he became my leading star .

I learned a lot from him . He also helped me fully understand that hard work ,good

education and excellent knowledge are key factors to progress the professional part of

life.

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STUDENT LEAVE FROM DNV

I got on a student leave from DNV 1981- 1986. After graduate studies ( MSE 82 and PhD

studies) at University of Michigan (1981-1984) with Professor Beck as my advisor I

moved to University of Trondheim (now NTNU) in 1984 to complete my Dr. studies.

The sponsors were DNV and Norwegian Research Council

I graduated in 1986 with a Dr. ing. (PhD) degree under supervision of Professor Faltinsen

The thesis title was : “ Three dimensional second order Hydrodynamic Effects on Ocean

Structures in Waves “ .

In a nut shell this was development of methods and a computer program for slowly

varying wave forces as well as high frequency wave forces on multiple floating bodies of

arbitrary shape.

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LEADER EXPERIENCE

A lot of my work time since 1986 until 2009 have been spent on being a department and

section leader in DNV, in several offshore technology areas as Floating production

systems (FPSO,SPAR ,TLP) ,Risers , Pipelines ,Mooring and Foundation . I also headed a

department for Subsea engineering for a period of time .

In Houston I was heading a department for Deep water Technology ( Floaters, mooring,

pipelines and risers). 2002-2005

I started the build up a technical unit in Trondheim in 2005 that continued until 2009.

This unit was called “ Offshore Technology ” and the competences covered were Offshore

platforms, lifeboats, pipelines ,risers and cranes with the intention to focus on the local

market .

This is now a unit (Technical Advisory)of about 25 highly qualified engineers ( with

Masters and PhDs) and Successfully operated and Headed by Guro Kjestveit and Prashant

Soni being the Business Development Leader .

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PROJECT EXPERIENCE

In the same period from 1986 until now I have worked on offshore projects (PM, Lead

Engineer ,Expert etc.) all over the world ( from Norway to USA-GOM, Brazil, West Africa,

Australia, Canada, Russia ….).

I also worked for some years with floating bridges that have been installed at

Bergsøysundet and Nord Hordaland as well as different concepts for a floating tunnel

bridge across Høgsfjorden .

From 2008 until now I have also been quite heavily engaged in the development of the

new generation of free fall lifeboats (FFL) mostly with a specific boat from Harding called

FF1200 This work has been technical assurance work carried out for BP and CoP .

The rest of my presentation I will use on an offshore project where I devoted a lot of my

energy from 2000-2005 . This certainly became my best project experience ever.

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Holstein Truss Spar Platform concept

Deck( LQ, Drilling &

Production)

Hard tank with Strakes

16 Mooring lines

Truss with heave plates

Top tensioned risers

SCRs not shown

Soft tank

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MY ROLE IN THE BP- HOLSTEIN SPAR PROJECT

CHIEF NAVAL ARCHITECT IN BP- GOM DEEP WATER PROJECTS

LEAD ENGINEER IN THE HULL AND MOORING TEAM

SUPERVISED THE PROJECT FROM FEED THROUGH DETAILED

ENGINEERING

FOLLOWED UP FABRICATION , TRANSPORTATION AND INSTALLATION

INPUT TO DFI RESUMES

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SOME DIMENSION AND WEIGHTS OF THE HOLSTEIN SPAR

TOPSIDE ( 4 modules + Drilling Rig +Operating), Weight = 28000 t

HARDTANK , D= 45.5m L= 89m Weight =25430t

TRUSS , L= 131m Weight = 6600t

SOFTTANK ( H= 8m) Weight = 3600t ( FIXED BALLAST ca.

18000t)

MOORING 16 Mooring lines . Sheathed Spiral wire (140mm) and Chain

(172mm)

Weight of mooring lines 8000t

16 Chain jacks

Suction Piles L= 39m and D= 6m

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BP - HOLSTEIN OIL AND GAS FIELD DEVELPOPMENT IN GOM about 300km south of New Orleans (2000-2005)

WORLD LARGEST SPAR

ENGINEERING AND BUILDING AS A FAST TRACK PROJECT

HARDTANK BUILT IN FINLAND AND TRANSPORTED BY HLV TO GOM

TRUSS/SOFTTANK BUILT IN TEXAS AND TOPSIDE IN LOUSIANA

TRUSS/SOFTTANK SKIDDED TO A BARGE AND LAUNCHED

TRUSS/SOFTTANK AND HARD TANK WET MATED AND HULL TOWED TO

FIELD

HULL UPENDED AND CONNECTED TO PREINSTALLED MOORING SYSTEM

VERTICAL RISERS INSTALLED AND SCRs BY PULL IN

TOPSIDE INSTALLED BY MODULE LIFTING

HOLSTEIN PAVED THE WAY FOR MAD DOG ,TAHITI ,PERDIDO…..AHA

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Size of the Holstein Spar platform compared to the Eiffel tower

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Holstein Hard tank in transport from Finland to INGLESIDE (Close to Corpus Christie) Texas

Black Marlin

Hard Tank

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Mating of truss with soft tank and the hard tank

Holstein in front

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Tow of Holstein Spar hull out from the yard in Texas

Narrow channel at Ingleside.

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Balder with Holstein Spar Hull on the field

Holstein Spar Hull upended and ballasted – Heerema “ BALDER” in work

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SOME SPAR TYPE PLATFORM “SPECIALS”

Deck design and space dependant on Spar diameter

Cost effective platform design

Very Good current/wind/wave induced motion characteristics for

support of risers

Vortex induced motions (VIM) important for mooring and riser design

Strake design to reduce VIM is a challenge during transport and

operation

Moonpool design due to sloshing

Fire and explosion risk in the moonpool

Aircans for Riser Support (old system), Spar Supported Vertical Risers

(SSVR)

Truss structure , heaveplate and softtank design

Transportation , upending and installation of fixed ballast( iron ore)

Mating of truss/softtank and hardtank ( So far Unique for Holstein)

Deck mating by floatover or lift of modules (most common in GOM)

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SAFER, SMARTER, GREENER

www.dnvgl.com

A long journey in Offshore and Marine Technology ( Short presentation)

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Arne Edvin Løken

[email protected]

+47 99509247

a long journey in offshore and marine technology

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