pipeline group installation engineeringcee.nus.edu.sg/updates/jobs/s7andpg-introduction.pdf ·...

© Subsea 7 - 20171 subsea7.com

Pipeline Group Installation Engineering

January 2019


Contents

• Subsea 7 Overview

• Pipeline Group Overview

• Pipeline Installation Introduction

• S-Lay Installation Method Overview


• Our global engineering team comprises over 1500professionals

• Supported by our Community of Experts• Key areas include:

- Design engineering of permanent works- Installation engineering, including the design of temporary works and procedures

- Project support, this includes many varied project activities

- Engineering Knowledge Management, including the development of best practice codes, fit for purpose engineered solutions, consolidating new technologies and techniques.

Engineering Overview - A Global First-Class Engineering Team


Execution – A global presence

206

105

415

31

278

37 I-Tech Services

125 Offshore Resources

122 Renewables (SHL)

Discipline TotalInstallation Engineering 590Structural + Geotech Engineering 216Drafting 173Rigid Pipelines 108Flexible / Riser Systems 75Engineering Management 112Materials/Welding 48Hydrodynamics 72Topside 14Other 107Total 1,515

37 159


Contents




• S-Lay Installation Method Overview


Pipeline Group OverviewPipeline Group brings together:

1. Rigid pipeline installation engineering including ECA;

2. Pipeline production: welding/Non Destructive Examination/Field Joint Coating production capability (Pipeline Production Team);

3. Swagelining – polymer lining services and technology

Our mission is simple:

WELD, INSPECT, COAT, LINE AND LAY PIPE AS COMPETITIVELY AS POSSIBLE


Onshore assets – hosting Pipeline Group fabrication services

Vigra Spoolbase,Norway

Leith Spoolbase, UK

Wick Fabrication Site,UK

Ingleside Spoolbase, USA


Offshore asset – Rigid Pipelay FleetReel lay S & J lay

Seven Oceans Seven Borealis

Seven Navica

Seven Antares

Seven ChampionSeven Vega


Global Welding Development Centre, Glasgow• Develop & deliver Subsea 7 Pipeline Production Technology

• Ensure continuity from development to production

• Research & Development of Pipeline Production Technology for future markets

Development

Prep/WPQT/PQT

Production

Tendering


Contents




• S-Lay Installation Method


S-lay Reel lay J-layPipe welded offshore Pipe welded onshore Pipe welded offshore

Shallow to deep waters Shallow to deep waters Deep to ultra deep watersNot suited for shallow waters

Deeper water requires a very long stinger May dictate pipe thickness -

Suited to install concrete coated pipe Not suited to install concrete coated pipe -

OD up to 72” Limited to OD≤20” Market generally OD>8” and OD<12”

Lay up to 4 – 5 km/day(multiple workstations)

Lay up to 10-15km/day(Requires a spool base in the area)

Lay up to 2 – 2.5km/day(very few workstations)

Pipeline Installation – Introduction - Methods


Pipeline Installation – Introduction - Methods

Anchoring PointAnchor / Pile / Platform

Jacket Leg / Beach Pulling Winch…

Initiation Cable

PipeHead or Structure

PLET / PLR / A&R head/ Stressjoint / ILT /

GPIMs… PipelineAncillaries can be fitted to the pipeline: buoyancy, anodes, VIV strakes,

piggy-back, shrouds, …

Laydown Cable

PipeHead or Structure


Pipeline AncillariesAnode

• Control the corrosion of the pipeline over its service line.

• Generally installed equidistantly along the pipeline.

VIV Strakes• Reduces fatigue impact on risers due to

large vibrations.• Normally assembled from three pieces.

In-Line Buoyancy• Provide specific geometric configuration

to prevent over utilisation of the pipeline. • Reduces top tension loads and or

prevents buckling.


Pipeline Installation – Introduction – Objectives of Lay Vessels

• Apply sufficient top tension to prevent thepipeline buckling due to combined bendingand external pressure.

• Manufacture the pipe onshore or offshore,vertical manufacture or horizontal.


Pipeline Installation – Introduction – Pipeline Installation Criteria

Curve Stability on Seabed Bollard Pull

Tension Initiation (Rigging / Anchor Capacity & geometrical constraint)

Laydown Cable Length and LaydownWinch Capacity

Vessel Tensioning Equipment

Stinger / Vessel Structural capacity Pipe clearance

Pipe stresses

Safe OperationsEquipment integrity

Pipe integrity


Contents




• S-Lay Installation Method


S-Lay - Pipeline Production Overview• S-Lay installation vessel is a ’floating factory’.• Multi-station production line (the firing line) allows productivity to be optimised.• Can introduce pipe as single (12m) or double joints (24m).• Vessel moves forward as each weld is completed.• Number of stations in firing line dictated by vessel length (typically around 10 working stations).


S-Lay - Pipeline Production Overview

Onboard welded pipe joints leave the vessel horizontally and are guided by means of a "stinger" - a structure located at the stern of the ship that supports the seagoing pipe string to control its bend radius.


S-Lay – Step by Step – CB Berthing


S-Lay – Step by Step – Pipe Load Out on Deck


S-Lay – Step by Step – Pipe Cleaning


S-Lay – Step by Step – Pipe Transfer in Firing Line


S-Lay – Step by Step – Pipe Degmanetisation in WS0

0


S-Lay – Step by Step - Pipe Line-up & Welding in WS1

1

ROOT & HOT PASS


S-Lay – Step by Step – Pipe Welding in WS2

2

FILL


S-Lay – Step by Step – Pipe Welding in WS3 and WS4

34

CAP FILL


S-Lay – Step by Step – NDT / Repair in WS5

5


S-Lay – Step by Step – FJC Activites in WS6

6



7



8


S-Lay – Step by Step – Pipe into Stinger


S-Lay – Step by Step – Pipe into Stinger

• Length from 15m to 92m (S7)

• Weight from 300mT – 1000mT

• Floating, supported with A-Frame…


S-Lay – Specific Operation - Initiation


S-Lay – Specific Operation - Laydown

8 1


S-Lay – Pros & Counts

Important Strain on the Overbend

Important Tension Requirement (thus thrusterscapacity) = Limiting Water Depth

Several Work Stations = Good cycle time


S-Lay – Limiting Criteria• S-Lay Shallow Water

Bending Moment / Strain / Stress in Sagbend close to TDP

• S-Lay Deep Water

Bending Moment / Strain / Stress on the Overbend

Bending Moment / Strain / Stress at Last Stinger Roller+ No Contact Condition at Last Stinger Roller

Bottom Tension

Top Tension


S-Lay - Positioning Method - Anchoring

• Traditionally anchors used for maintaining position• Anchor handling vessels required to continually re-position anchors• Water depth limited by anchor wire lengths


S-Lay - Positioning Method – Anchoring or DP

Dynamic Positioning (DP): Most recent construction vessels use DP for

maintaining position Series of hull mounted thrusters centrally

controlled to maintain position Suitable above a minimum water depth

Anchoring can be tricky in a congested seabed..


S-Lay - Features

• First commonly used method.• Still most common use world-wide.• Suitable for installation in shallow and intermediate waters.• High production rate due to multiple workstations.• Suited to install concrete coated pipe. • Deeper water requires a very long stinger.• Vessel can be anchored or use Dynamic Positioning (DP).• Suitable for shallow and deep water (DP only).• The use of ‘steep s-lay’ criteria increases capability in deep water• Pipe Diameters up 72”• Average lay rate up to 4 – 5 km/day• Very sensitive to weather

pipeline group installation engineeringcee.nus.edu.sg/updates/jobs/s7andpg-introduction.pdf ·...

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