Webinar presentation subsea manifold installation tcm4 602978

DNV GL © 2013 Revised: 11 May, 2014 SAFER, SMARTER, GREENERDNV GL © 2013

Fan Joe Zhang

Product Manager – SURF & Marine Operation, Design & Engineering

DNV GL - Software

DNV GL Teck Talk webinar:

Subsea manifold installation – go through the splash zone

1

DNV GL © 2013 Revised: 11 May, 2014

Agenda

Introduction to Sesam Marine software: the software tool to be used in the presentation and demo

Introduction to the subjects

Body(ies) definition and objects

Couplings

Conditions

Post- processing

Typical applications and examples

Demo

2


Introduction to Sesam Marine


Common challenges in marine operations engineering

How do you compute the sling forces?

how do you know contact forces?

How do you know what to do when something unplanned happens?

4


Sesam Marine

Managing risk of marine operations with visual simulation of calculations

Sesam Marine

Managing risk of marine operations with visual simulation of calculations

5


What is Sesam Marine?

A complete package for simulation of marine operations, from modelling to results

Build upon “state of the art” software for dynamic analysis

Graphical user interface makes modelling fast and easy

Developed together with Marintek

– Includes the modules named Sima, Simo and Riflex.

6


Marine operation analysis workflow in Sesam software

7

Sesam GeniE Sesam HydroD

Panel and other models to run hydrodynamic analysis

DATA

Added mass, damping coefficients, 1st and 2nd

order wave loads, etc.

Sesam Marine

Graphicfiles

Graphic files for animation


What Sesam Marine can be used for?

Engineering

– Quality assurance

– Feasibility evaluation

– Distinguish the really challenging tasks from the seemingly challenging tasks

Preparation for the actual operation

– Improve HSE performance

– Familiarization

– Cross – disciplinary communication

Decision support during actual operation:

– Online monitoring

– Visibility

– What – if – analysis

8

Simulating boarding

Simulating pipelaying


Introduction to the subjects


The following subjects will be presented

Calculation of motion of any number of bodies– Weak positioning and coupling forces– Integration of equations of motion for each body separately– Maximum time step related to lowest natural period

Each body has 3 or 6 degrees of freedom (DOFs)– Various force models

Positioning system– Springs– Mooring lines– Thrusters

Couplings– Springs and dampers:

– Lines, winches– Fenders, bumpers– Docking cones

10


System Modelling: GUI

11


Basic definitions and objects– Location and environment– Body(ies) definition– Couplings– Calculation parameters– Conditions


Location and environment definition

Location

– Physical constants

– Acc. of gravity

– Water density

– Air density

– Water depth

– Etc.

– Sea surface and flat bottom

Environment

– Wave

– Swell

– Wind

– Current

13


Body(ies) definition


Definition of bodies – 4 types

1. Large volume body, 6 degrees of freedom. Total motion is simulated in time domain

2. Large volume body, 6 degrees of freedom. Separation of motion calculation:

– First order wave motion calculated in frequency domain, from motion transfer functions.

– Low-frequency motion calculated in the time domain

3. Small volume body, 3 translation degrees of freedom. Position dependent hydrodynamic coefficients are allowed

4. Immovable body. Used for control and study of dynamic forces on a body, without the influence from body motion

15


Parameters for bodies

16

Read from hydrodynamic analysis


Time dependent mass

Useful for ballasting during heavy lift operations

– offshore mating

– module removal

Options

– Specified mass change rate at given position

– Filling of tank with simple geometry, specify flow rate, effect of slack tanks

Applications

– Simulate a ballasting sequence and its influence on the static and dynamic response of a vessel.

– Model a sudden or gradual waterfilling of a subsea module after a specified time.

– The specified increase or decrease in mass both affect the gravity force and the mass matrix.

17

0

100

200

300

400

500

600

. .. ... Time

Mas

s (t

)


Positioning system

Various optional systems used control the global position of a body, such as:

Thrusters, either controlled by a DP system or not

Catenary mooring lines

Linear or non-linear springs connecting the body to a globally fixed point

Various guiding or contact element types

The springs and contact elements can also be used for coupling elements between bodies.

18


Simplified Lift Line Model

19

A fast and accurate lift line model for prediction of total static and dynamic line end forces and load offset.

Validation with irregular waves: Hs = 4m, Tz = 5s

Water depth: 3000 m

Load mass: 30 t

Added mass: 10 t

Wire mass: 30 t RIFLEXSIMO


Couplings– Connection and contact element models– Hydrodynamic couplings


Docking cone

Docking cone model can be used both as a global positioning element and a coupling element between bodies

21

OBJ1

Δz

Δz1 Δz2

Force

Radial distance


Fender

The fender model can be used both as a positioning element and as a coupling element, and expresses the contact force between a fender (point or cylinder) and a plane.

The following characterizes the fender model:

– Zero contact force for distances larger than a specified value

– Compression force normal to the plane calculated from a specified deformation - force relation

– In-plane friction proportional to the normal force (static and dynamic friction may be different). Shear stiffness and deformation of the fender included.

– The plane can have any position and orientation

22

Fenderpoint

Fender element w/ rolling

Fender point

Fender element w/o rolling


Fender examples

23

Roller berthing fender at ship's side Roller fenders between two ships

Spherical fender Fenders used as support membersFender used for dist. measurement

Fixed berthing fender at ship side


Bumper

The bumper element model is used to model contact force between a body and a globally fixed cursor or bumper, or contact forces between bodies:

Particularly useful in the analysis of offshore installation operations, where deflectors / bumper bars are used to guide a module to its correct position and to protect existing equipment from impact damages.

24

Bumpers

Cone/support

1

23

The final control of horizontal position can be accomplished by docking cones, and the vertical supports by linear springs.


Topside docking cone with bumper

25


Fenders and connecting wires

26


Hydrodynamic coupling

Most accurate method is to include full hydrodynamic coupling as well as mechanical coupling between the two vessels.

Hydrodynamic coupling between the vessels includes

– Coupled added mass

– Coupled retardation functions

27


Calculation Parameters

In a SIMO or RIFLEX task there are static and dynamic calculation parameters that must be adjusted to suit the needs for the given project.

28


Conditions– Initial condition– Condition– Condition set– Conditions space


Conditions and analysis

30


Condition set and condition space

Condition set is used to define a list of runs (i.e. a parameter variation) based on variables defined in the task.

– One or more variables as fixed for all runs in the "Configure fixed variables" section

– User may also set one of the variables as a probability variable -typically used for fatigue analyses. The probability variable must add up to 1 for all simulation runs combined.

Condition space is used to create a matrix of runs based on variables defined in the task.

– All variable values are run against each other.

31


Flexibility

Easy to modify parameters and to run several simulations

32


Post-processing


Direct plotting from result data - “Fast results”

34


Post-processing – Transparent (QC/QA)

35

Diagram Palette


Animation

36


Typical Applications and examples


Typical applications – Complex marine operations

Lifting of topsides and modules

Lifting and installation of SURF structures (templates, pipelines, flexible risers)

Float-over installation/removal of topsides

Load-out from quay to barge

Offloading (tankers in tandem or side-by-side)

Offshore crane operations

Jacket lift installation and removal

Transportation of offshore floaters (e.g. TLP, Semi, Spar)

Up-ending of SPAR

Towing by tugs (e.g. GBS)

38


Marine operations at Sheringham Shoal

39

Lifting of topsides and modules


Jacket superstructure installation

40

Dynamic analysis of a float-over operation

Jacket support: Docking cone


Pendulum installation method

Developed by Petrobras Depth 3000m Template weight: 285t

41

[m]

[s][s]

[kN

]

Tension at anchor handling vesselVertical template position


Example: Installation of an 28" spool on the Snøhvit field

42

Installed successfully by Technip Offshore Norge AS August 24, 2005


Example: Installation of the Fram module onto TROLL C

The model includes:

Hydrodynamic models of TROLL C and S-7000

Dynamic positioning

Bumpers

Docking cones

Support elements

Crane wires

Tugger lines

43


Example: Installation of a 500t module on Snorre A

44


Multiple bodies

45


Example: Field Bottom Structure for Ormen Lange (1050 t)

The model includes:

Hydrodynamic vessel model

Dynamic positioning

Fenders

Mooring hawsers

Support elements

Complete lifting configuration

Splash zone forces

Geotechnical forces

46


Example: Installation of Ormen Lange Template

47

1140 T TemplateInstalled on 850 m water depthby Heerema Marine Contractors 20.08.2005


Example: Scandi Acergy installing Gjoa template

48


Example: Ormen Lange - Inline Tee installation Use of local guidewires & guideposts

49

Guide funnel with multiple guide point passages


Exploring new installation methods

50


Leg Turbine Platform Analysis – Feasibility study

51


Demo case


Installation of subsea structures

53

RAOs

Vessel

DP


Float-over installation

54

4 fender couplings – bt1, bt2, bt3 and bt4Fenders Docking cone

Catenary mooring lineFixed force elongation

Bumper element


SAFER, SMARTER, GREENER

www.dnvgl.com/software

Thank you!

[email protected]

55

Webinar presentation subsea manifold installation tcm4 602978

Technology

Transcript of Webinar presentation subsea manifold installation tcm4 602978