Assystem Capabilities

A NEW

PERSPECTIVE

ON GROWTH

ENERGY & NUCLEAR

Introduction to Assystem

ENERGY & NUCLEAR Assystem UK Ltd | Club Street | Bamber Bridge | PRESTON | PR5 6FN | UK Tel.: +44 (0)1772 645 000 | Fax: +44 (0)1772 645 001 E&[email protected] More information at www.assystem.com FM 23790

Product Design & Development

Process & Plant Engineering

Technology Development & Implementation

Operation & Maintenance support

Assystem is a leading international group providing Engineering and Consultancy services across a broad range of industry sectors. The UK branch of Assystem has 10 offices, a permanent workshop facility and approximately 1500 engineers. Energy & Nuclear is the oldest of the Assystem UK divisions, with a heritage spanning 40 years. Over that time Assystem UK has achieved an impressive record of growth and diversification and provides value-added services clients in Power Generation, Oil & Gas, Aerospace, Automotive, Defence, Marine and Life Sciences industries. Assystem UK provides a full life cycle of design services that include concept design, detail design, mechanical and electrical control & instrumentation engineering, analysis, design substantiation, safety engineering, purchasing, assembly & testing and recruitment. Through its network of offices, Assystem provides a direct

local interface to our customers, enabling a clearer

understanding of client requirements and stronger working

relationships. Delivery of the consultative and technical

solutions is then delivered through the resources and

technical structure at the local offices and technical centres

of excellence throughout the country.

Contract Models

http://www.assystem.com

Design Capability


Design Engineering Services

Within these market areas, we provide a comprehensive array of services and products that include concept design, detail design, EC&I, engineering, analysis, substantiation, manufacturing, testing and recruitment.

Assystem is a leading international group providing Engineering and Consultancy services across a broad range of product manufacturing and process sectors including the Aerospace, Automotive, Defence, Energy, Life Sciences, Naval and Nuclear industries.

The Energy & Nuclear Division of Assystem UK Ltd. has a heritage spanning 40 years and over that time the group has achieved an impressive record of growth and diversification. The strength of the group lies in the ability to provide dedicated, multidiscipline project teams composed of specialist staff. There are currently 10 UK offices and one permanent Test & Development Facility.

The company typically operates in four market areas:

Product Design & Development

Process & Plant Engineering

Technology Development & Implementation

Operation & Maintenance support

How we work Through its network of offices, Assystem provides a direct local interface between customers and the Assystem organisation. This enables us to establish a clear understanding of our client’s requirements. Delivery of the technical solutions is then facilitated by the resources, facilities and technical capabilities throughout the company at the local offices and technical centres.

Design and Substantiation

Product efficiency demands the linking of design and assessment to the required targets to be carried out concurrently to achieve the best designs in the shortest possible time. Assystem achieves this by embedding the analysis function within the design loop and ensuring that the lessons learnt from the functional performance of one iteration is fed back to the next: the design and analysis engineers sit next to each other and work on the designs concurrently.

Conceptual Design

Multi-Disciplinary Engineering Design

Design Studies

Design Capabilities:

Detail Design & Analysis

Process Simulation & 3D Mock Ups

Detail design, manufacture & test


Design Capability


Seismic assessment (ASCE4-98 / Eurocode 8)

Response spectrum and time history analysis (linear or nonlinear)

Steelwork element design and detailing to

BS5950 Staircases / platforms Building frames Canopies

Modular construction

Concrete element design and detailing to BS8110

Pre-cast Flooring Fire panels

Civil design

Foundations and retaining walls (BS8004) Reinforced concrete (BS8110)

Envelope (BS5628)

Crane and lifting equipment design and

assessment to BS2573 / BS EN 13001

Case Studies UKAE Harwell - design and build

of a retrieval machine.

Conceptual Design

Detail design for manufacture.

Procurement, systems

interrogation inactive

commissioning.

Rolls-Royce Submarines -

fuelling/ defueling equipment.

Technology development

Concept design

System Integration

Mechanical seismic

verification and

substantiation.

British Energy - design and

build of graphite sampling

machine.

Technology development

Conceptual & detail design

Procurement construction &

commissioning

Nuclear industry - boiler lift rig

Strength and limit load

checks

Seismic substantiation

BS2573

Nuclear industry - impact

analysis of storage flask

Concurrent design &

substantiation

Explicit dynamic

Analysis Capabilities:

Static, linear / non linear FEA (ANSYS,

NASTRAN, ABAQUS)

Dynamic / impact (Dyna, RADIOSS,

ABAQUS)

Thermal transient analysis

Design optimisation (OPTISTRUCT, ANSYS,

ABAQUS)

Robustness Studies (HyperStudy, DoE)

Fatigue assessment

Pressure vessel assessment:

ASME III, ASME VIII, TEMA, ASME/ANSI B31)

PD5500, EN13445, BS806

Fracture assessment (including Rcode and

BS7910)

Nuclear Industry - cracked

body analysis.

Cracked body analysis

BS7910/R6 code checks


Mechanical Engineering Capability


Assystem UK Energy & Nuclear offers a world class mechanical engineering design service utilising a broad base of in-house skills relevant to the world energy market. Specialist knowledge developed over 40 years across a multi disciplined team, allows Assystem UK Energy & Nuclear to be a “one stop shop” for the delivery of cost effective technical solutions to clients for all phases of the project life cycle.

Assystem UK Energy & Nuclear has proven expertise in the following:

Optioneering and feasibility studies

Front-end concept design

Detail design and the production of manufacturing drawings Design substantiation, Independent Technical Assessment, O&M manuals

Manufacture and Development of Special Purpose Equipment

Mechanical handling

Strategic planning

Project Management

Risk Analysis, FMECA, ARM, HAZOP, HAZID

Procurement, Inspection and Expediting

Research and development

Compliance with EU directives, CDM regulations, relevant safety codes and standards Installation and commissioning

Product design and development

Building, plant and equipment surveys

Projects can typically range from the provision of ‘front-end’ designs for new concept machinery, to the assembly and development of bespoke mechanisms and equipment to clients’ individual specifications. For all projects, the company operates a Quality Assurance system to ISO 9001:2008, which is certified externally by the British Standards Institution, in addition to any other project-specific requirements.

Assystem UK Energy & Nuclear’s design and problem solving ability is backed by comprehensive technical analytical support such as:

2D/3D CAD Drawing and modelling (AutoCAD, Pro E, Inventor,

SolidWorks, Catia)

FE Stress analysis (thermal, static, dynamic)

Seismic analysis – equipment and buildings

Systems engineers, computer specialists, electronic engineers and

electrical/ instrument engineers

3D Simulation

Project planning using Microsoft Project and Primavera

Mechanical Engineering Services


Mechanical Engineering Capability


Remote engineering; robotics, manipulators, remote viewing, shield doors, through-wall drives

Mechanical handling including bogies, conveyors, cranes

Mechanical equipment including compactors, powder processing, fuel fabrication & assembly

Wet process equipment engineering including vessels, piping, pumps, heat exchangers and other process plant and installation

Nuclear transport equipment including flasks, containers

Nuclear containment & ventilation including ventilation systems, fans, heating, ducting, filters

Services including steam, gases, water, electrical, fire protection, security etc.

Alpha plant engineering & equipment including gloveboxes

Engineering substantiation, technical assessment of equipment capability and justification of adequacy;

FMEA & ARM

Process plant including encapsulation

Safety case – support and supervision

Typical Equipment & Processes

Case Studies

Synchrotron – DLS

Assystem UK has been closely involved in the design of the Diamond Light Source Synchrotron - the largest science facility to be funded in the UK for over 30 years and costing £350m. Assystem UK’s team of up to 25 engineers have been responsible for the design of many of the high precision mechanisms and support systems associated with the accelerator.

AGR Graphite Sampling System – British Energy (Barnwood)

Assystem UK designed and supplied a graphite sampling system for deployment inside the fuel channels of AGR reactors. The equipment incorporated a remote trepanning tool, precision tool alignment mechanisms, sample conveying system and a CCTV and operator control system.

Nuclear waste retrieval machine – UKAEA

Assystem UK designed and developed a waste retrieval facility for the removal of intermediate level waste canisters from the B462.9 tube store at UKAEA Harwell. The innovative design consists of a 3 cubic metre 220 ton shielded containment enclosing a retrieval hoist, grabs and a waste export system.


Control, Electrical and Instrumentation

Capability


Capability Scope

Our capabilities cover a broad range of the C,E&I spectrum. These include:

Control

Embedded real-time systems

SCADA and data-logging

Networks

PLC systems

Operator interfaces and HMIs

Safety system design and

substantiation.

Bespoke electronics

Electrical

Site surveys

Cabling design

Site installation

Building services including

lighting, earthing, and power

distribution

Instrumentation

In-line testing

Radiometrics

Process

instrumentation

Our substantial Electrical, Control and Instrumentation (C,E&I) capabilities range from initial concept development through design, in-house assembly, installation, commissioning and through-life maintenance support.

Control, Electrical & Instrumentation

Assystem UK Energy and Nuclear has in-house systems engineers, computer specialists, electronic engineers and electrical/ instrument engineers whose combined experience can be used to complete the most demanding of projects. This includes complex safety critical control systems or nuclear applications enabling us to provide complete and fully integrated solutions.

Furthermore, our C,E&I engineers are highly experienced in working alongside other engineering disciplines to provide a total system integration capability.


Control, Electrical and Instrumentation

Capability


Assystem have extensive experience in the design and substantiation of Safety Instrumented Systems and are familiar with the requirements of IEC61508 and IEC61511. A number of our engineers have undergone training in Sellafield Sites Ltd engineering guide for safety systems, EG90, and have also successfully completed other customer specific but broadly applicable training in the realisation and documentation of Safety Systems.

Our engineers are experienced in the use of a wide variety of tools and applications for the design and

development of software and hardware systems. We have a number of engineers with extensive

experience in the development of PLC systems, under IEC61131 and various customer specific

standards, for a variety of PLC platforms including Rockwell / Allen Bradley SLC series and Siemens S7.

We also have experience with older systems such as Allen Bradley PLC5 giving us the capability to

reverse engineer legacy systems in order to upgrade or replace them.

‘Reliability Workbench’ with ‘Fault Tree Plus’ are used for the design and validation of Safety Systems and

several of our engineers are trained and experienced in its use. Rapid development of test systems and

less critical control systems is undertaken using National Instruments LabView for which we have a full

development environment with many of the popular control and instrumentation sub-packages. We have

several engineers experienced with the use of real time operating environments such as VxWorks and

their application in the realisation of embedded real time systems.

Designs and drawings are produced using AutoCAD electrical which allows us to use a component based

approach to the creation of schematic diagrams and panel designs. Amtech is used for undertaking and

checking cable calculations.

All of our engineers are accustomed to being required to use a myriad of other proprietary and bespoke

packages as necessary to satisfy the requirements of specific projects. These include design tools,

software development systems and modelling packages.

Hardware Design: Overall Systems Integration - High Integrity Protection Control Systems - Safety Instrumented Systems - Robotics & Remote Handling - Bespoke Electronics - MCC & Panel Design & Wiring - HVDC - Cable Design - Building Management Systems - Industrial Networking - Process Instrumentation - Power Distribution. Software Design: PLC - Embedded Systems - SCADA & HMI Design and Testing.

Toolsets

Safety Engineering

Engineering Services Include:


Finite Element Analysis Capability


Finite element analysis is carried out as a bespoke service and also as part of larger projects. On larger projects design and analysis engineers work within the same office and develop the designs concurrently.

FEA Capabilities

Static, linear / non-linear analysis

Dynamic / impact analysis

Thermal transient analysis

Design optimisation

Robustness studies

Computational Fluid Dynamics (CFD)

DoE & response surface modelling

Fatigue assessment

Pressure vessel assessment

Fracture assessment

Seismic assessment and analysis

Hyperelastic material (e.g. rubber) simulation

Process simulation (e.g. pipe bending /

straightening)

Finite Element Analysis


Finite Element Analysis Capability


Case Study: Flask Impact Design Substantiation

To support and substantiate the design of a nuclear storage flask and internal assembly, dynamic impact analysis was performed by Assystem UK to show that the ability of the container to safely hold its contents would not be comprised through any impact that could occur through being dropped during transit.

The flask has been designed to provide a safe method of containment for nuclear material. The flasks are to be kept in a storage facility where drop scenarios are possible. Two drop heights were analysed, each with nine different drop orientations (see example, bottom right).

The FEA mesh of the flask components was generated using Altair Hypermesh and analysed using RADIOSS v.4.4u, both of which are part of the Altair Hyperworks suite.

The study identified five different possible failure modes, each of which was investigated for both drop heights and all drop orientations. The mode of most concern was the failure of the dynamic sealing of the flask. This involves the seals being momentarily misaligned during impact and allowing the escape of a limited, but dangerous, amount of gas.

The substantiation showed that, with the design and drop heights specified, the ability of the flask to hold its contents would not be compromised. This design was physically tested at the Assystem UK workshop facility, and all tests were in agreement with the above analysis.


Fracture Analysis Capability


Fracture analysis is carried out as a bespoke service and also as part of larger projects within the Energy and Nuclear division of Assystem UK Limited. Our analysis capabilities can be accessed at National or local levels via our network of 10 UK service centres.

Assystem can perform R6 Procedure structural integrity assessments on structural components containing

defects.

Fracture Analysis

Using R-CODE Assystem can define and subsequently assess geometry specific solutions.

Un-cracked and cracked finite element analysis models are used to generate crack opening stresses and SIFs. Modification of geometry codes undertaken to account for specific geometry (SIF solution modified using FEA results). Geometry code sensitivity is undertaken for each assessment.

Defects: (NDE, postulated, maximum reasonably foreseeable Virgin

Defects assumed in attachment welds.

Cracked geometry

Un-cracked geometry

Critical flaw size calculations (calculates maximum defect size and proximity to brittle / plastic collapse). Assystem can determine the limiting start of life defect size that would grow to the limiting critical flaw size during the assumed operational life from which acceptance criteria (targets based on material toughness) are specified.

Fatigue Crack Growth made under known cyclic loading

General Failure Assessment Diagram Start of Life Defect Vs. End of Life Defect

Defect (mm)

Maximum

K (MPam)

Minimum K

(MPam)

0.5 8.0 -21.2

1.0 9.1 -23.2

1.5 9.4 -23.5

4.0 7.8 -18.1


Fracture Analysis Capability


Presentation of Margins of Safety

Fracture margins based on material fracture toughness with respect to operational temperatures (including transition regions). These calculations account for crack tip plasticity and allow safe operating temperatures to be identified

Cracked body analysis can be carried out for assessments against the Failure Assessment Diagrams (FAD). Finite element analysis is used to determine the Kr (J-integral) and Limit Load Analysis to determine Lr.

Pressure vessel design and assessment to all major codes (ASME III / VIII, PD5500, EN13445 etc.) Primary circuit and secondary side components (eg steam generators, regenerative heat exchangers).

Design and hydrotest conditions and Level A (fatigue) operation. Recent assessments moving towards strain predictions and away from stress linearisation (or planarisation).

Fatigue life evaluation (or re- evaluation based on measured transient blackbox information) carried out in accordance with design codes (eg ASME III) or using modern stress-life and strain-life techniques.

A key aspect in plant operation is life extension (aging plant or extension of existing Safety Justifications) therefore knowledge of pessimisms in fatigue calculation is vitally important.

Fatigue evaluation can be carried out elastically in accordance with design rule codes, or optionally, elasto-plastically to check for shakedown as well as provide strain ranges for strain-based fatigue calculation. Non-linear material models (e.g. nonlinear kinematic plasticity) used in assessment with life-cycle loading applied.

Public domain RPV


Civil Engineering Capability


Assystem is a leading international group providing Engineering and Consultancy services across a broad

range of product manufacturing and process sectors including Aerospace, Automotive, Defence, Energy,

Life Sciences, Naval and Nuclear industries.

Within these industries, Assystem have delivered civil engineering services in conjunction with other

aspects of the projects. We have a dedicated civil engineering team; capable of interacting with the

customer at all levels.

Our civil engineering capabilities can be accessed at national or local levels via our network of 10 UK

service centres.

Market Sectors

Defence

Civil Nuclear

Health / Education / Residential

Industrial / Commercial / Retail

Safety

CDM 2007

Safety case

Risk assessments

Method statements

Continued Operational Safety Reports

(COSR)

HAZOP/HAZCON

Building Structural Design (Design/Analysis and Detail)

Sub Structure

Piled/pad foundations (BS 8004) Basements

Retaining Walls (BS 8002)

Super Structure

Steel frame (BS 5950) Reinforced concrete (BS 8110) Composite

Envelope

Masonry (BS 5628) Cold rolled cladding

Concrete panels

Civil Engineering Services


Civil Engineering Capability


Structural Elements

Design and Detailing

Steelwork (BS 5950 / BS EN 1993)

Mezzanines Staircases/ platforms Pipe bridges/plant support Connections Modular Construction

Concrete (BS 8110 / ACI 318M)

Pre cast foundations, including retaining walls

Fire panels Flooring systems Industrial floor slabs Culverts/ bridges (BS 5400)

Survey / Structural Assessments

Topographical surveys/Desktop studies

Condition/Refurbishment/Modification

Civil / Nuclear Decommissioning

Impact Assessment

Construction Documentation

Building Control Submissions

Basis of Designs

Design Method Statements

Design Justifications Reports

Software

By utilising Assystem’s internal resource together with strategic partners, projects can delivered to clients

using a wide variety of design and analysis software seamlessly integrating with existing customer IT

infrastructure.


Nuclear Process Piping Capability


Assystem is a leading international group providing Engineering and Consultancy services across a broad

range of product manufacturing and process sectors.

Nuclear Process Piping is carried out as a bespoke service and also as part of larger projects. On larger

projects design and analysis engineers work within the same office and develop the designs concurrently.

Our engineering capabilities can be accessed at national or local levels via our network of 10 UK service

centres.

Nuclear Process Piping

PSA5

Piping Capabilities

In-House Software

Flow Calculations

Fluidflow

Flowmaster

Design

AutoCAD P&ID

AutoCAD Plant 3d

Pipe Stress

Caesar II

Bentley AutoPIP (ADLPipe)

Whessoe PSA5

Front End Piping Design

P&IDs

EFDs

Detailed piping design

Pipe support design

Piping isometrics

Flow calculations

Pipe flow analysis

Pipe stress analysis

Fatigue analysis

Pressure vessel assessment

Seismic assessment and analysis

Process simulation (e.g. pipe bending / straightening)

HAZOP Studies


Nuclear Process Piping Capability


Assystem has a wide ranging background of process piping experience with many examples in the Nuclear sector. CRTF Rig – Raynesway Engineering Laboratory

Full design of a rig to provide hot and pressurised water to two test vessels. Assystem’s scope includes the front end initial design, development of final design, detailed drawings, P&ID’s, flow calculations and analysis, stress analysis, equipment and piping support, flexibility analysis, HAZOP Studies and piping isometrics. Wylfa Power Station - AETP Discharge Pipeline

Complete design and analysis for a replacement AETP discharge pipeline. Assystem’s scope of supply included site surveys, design of pipes and supports, detail drawings, fabrication drawings, structural and stress analysis of pipes and supports, design of secondary containment system and leak detection system. Hunterston ‘A’ Decommissioning Site – Modifications to AETP

Design, manufacture, installation and commissioning of a replacement delay tank and ancillary systems and pipework. Assystem’s scope of supply included design of pipes and supports, relocation of existing equipment, detail drawings, fabrication drawings, structural and stress analysis of pipes and supports, tank design and substantiation, design of secondary containment system and leak detection system. Trawsfynydd Fire Pump System – Improvements to meet Regulations

Design and analysis of new fire pump system to improve existing system. Extensions of existing lines couples with new higher spec pumps to allow fire system to meet regulations. Assystem’s scope of supply included flow calculations, pump selection, pump installation, flow analysis, pipework design, pipework detailing, pipe supports and stress analysis.

Case Studies


Safety Engineering Capability


Assystem is a leading international group providing Engineering solutions across a broad range of product

design development life cycle stages including Aerospace, Automotive, Defence, Energy, Life Sciences,

Petro-chemical/Oil & Gas, Naval and Nuclear industries.

Assystem have a dedicated energy and nuclear safety engineering team capable of providing a full suite

of safety engineering services to all stages of a project life cycle.

Safety Engineering Services

Safety Management Systems

Conventional and nuclear safety analysis

Risk Management

Human Factors Analysis

Safety, HF and ARM training

Operation / Safe Systems of Work

Analysis and derivation of product availability,

reliability, maintainability and supportability

requirements

Decommissioning and disposal

Assystem Safety Management Systems capability includes:

Services

The supply of safety services to Customer

requirements, including the role of Independent

Safety Assessor / Auditor

Design, development & implementation of

Project Safety Management Systems

Production and delivery of Product Safety Case

documentation


Safety Engineering Capability


Safety Case

Assystem have the software capability to carry out safety assessments. The software can perform techniques such as HAZOP, HAZID, HAZAN, FTA and ETA. PHAST software can be used for material release and consequence analysis

Production of Safety Case documentation provides a record of the decision-making process. Assystem will provide a full range of Safety Case documentation including:

Risk Assessment, risk reduction, cost benefit analysis and risk

acceptance to ALARP criteria

Safety Standards and Strategy Development

Physical and Functional Safety Assessments using the following

techniques: Hazard and Operability Studies (HAZOP) Hazard Identification (HAZID) and Hazard Analysis (HAZAN) Failure Modes and Effects Analysis (FMEA) Failure Modes Effects & Criticality Analysis (FMECA) Fault Tree Analysis (FTA) Event Tree Analysis (ETA)

Safety Engineering Services:

Hazardous Area Classification Consequence assessments/hazardous material releases Fire safety assessment Chemical safety/occupational health risk assessment Explosion analysis Confined spaces risk assessment General risk assessment CDM design risk assessment Safety Integrity Level determination (Functional Safety – 61508/61511) Safety inspections/surveys Gap analysis/auditing of safety management systems. Pressure systems ‘Written Schemes of Examination’ Pressure systems safety advice Pressure Equipment Directive

Software

Quality

All Assystem UK sites are certified to BS EN ISO 9001:2008.

Cert No. FM23790


Seismic Analysis Capability


Seismic analysis is carried out as a bespoke service and also as part of larger projects within the Energy and Nuclear division of the company. Our civil engineering capabilities can be accessed at national or local levels via our network of 10 UK service centres.

Seismic substantiation performed using the following methods:

Static equivalent method

Response spectra method

Time history method

Stress analysis performed using hand calculation methods

(MATHCAD) and finite element analysis

(ANSYS, ABAQUS & LS-DYNA)

Code checks performed to BS 2573, BS 5950 and ASME III Level D

Generation of artificial acceleration time histories (SIMQKE) for given response spectra

Generation of secondary response spectra for given time earthquake time history data

Seismic Analysis Services

Quality

Seismic Assessment Capabilities

All sites are certified to BS EN ISO 9001:2008 for design and manufacture. The quality management system is managed from head office and also by quality managers within each facility.

Component parts

Cranes/Lifting equipment, Mechanical structures

Structural steelwork, Buildings

Typical Structures Analysed


Seismic Analysis Capability


In support of the Design Substantiation Report (DSR) produced by Sellafield Ltd., Assystem provided the as-built seismic design substantiation of the In-Cell Cranes and their rail systems for WVP REF. At the time, the equipment was already installed and undergoing final commissioning but a robust seismic substantiation from the design stage was lacking. The substantiation was based on a response spectrum analysis of beam element F.E. models of structures. These gave forces and moments within structures from which code assessment of structural members were made using spreadsheets whilst local design details were assessed by hand calculations using Mathcad. The main body of the report reflected the DSR content whilst the supporting detail was placed in appendices; this enabled Sellafield Ltd. to quickly transfer the required information into the DSR. Substantiation required demonstration of the ability to meet a number of System Functional Requirements against the Design Basis Earthquake (DBE) loading with a further demonstration of margins against cliff edge effects, the Margins Earthquake (1.4 times DBE). This was achieved by demonstrating that the design maintained an elastic and ductile response under the DBE, using a code based assessment, with a performance based assessment to provide confidence against cliff edge effects. The assessment was based on a demonstration of an understanding of the ultimate failure modes of the structure, taking into account:

Redundancy or alternate load paths

Ultimate capacity of components

Reduced loading due to increased damping

A significant part of this demonstration was achieved based on the reserves demonstrated against the DBE loading; where this could not provide the required confidence then an assessment was made using one of the following:

Reasoned argument (simple or in depth) with no further analysis

Additional simple analysis

Additional in depth analysis

Although the assessment raised a number of technical challenges it was completed successfully; the report was accepted with only a small number of minor comments.

Case Study: Waste Vitrification Process (WVP)

Including details of Residue Export Facility (REF), In-Cell Cranes and Seismic De-sign Substantiation

Overhead Jib crane


Marine Hydrodynamics Capability


Assystem is a leading international group providing Engineering and Consultancy services across a broad range of product manufacturing and process sectors.

Marine hydrodynamics analysis is carried out as a bespoke service and also as part of larger projects.

Our engineering capabilities can be accessed at national or local levels via our network of 10 UK service centres.

Marine Hydrodynamic Services

Capabilities

Marine hydrodynamic analysis performed using the following approaches:

OrcaFlex Abaqus Aqua Simulink & SimMechanics Probability & Monte Carlo analyses Hand calculations

Marine hydrodynamic and wave physics expertise

Mathematical modelling and time-domain simulation

Physical modelling, prototyping and testing methodology

Wave analysis for specific marine locations to accurately

describe extreme events, and normal conditions to support design specification

Vessel motion analysis: RAO’s are used to convert

wave analysis into vessel motion analysis, for any position on a vessel. Vessel and wave motion analyses replace pessimistic rules of thumb and unnecessary safety factors and feed into engineering design specification eliminating over-engineering and the associated costs and difficulties it brings. The above capabilities can add value to projects in many areas of offshore engineering. Assystem UK has in-house experience in consulting and working within; offshore oil & gas, submarine telecoms, marine defence, offshore wind, wave power generation and tidal power generation projects.


Marine Hydrodynamics Capability


Case Study: Vessel Motion Analysis

Offshore equipment must be designed to withstand, or exploit, the forces and motions that are experienced as a result of the waves and associated vessel motions. Vessel motion analysis acts to provide a more complete understanding of what these forces and motions will be under normal circumstances, and what extreme occurrences could be expected, and how often. This understanding supports Lloyd’s and DNV codes and can feed straight into design reviews giving engineers the confidence to choose more optimised designs or highlight potential issues to them. Thus cost is saved through the reduction of over-engineering and time is saved through the reduction of design iterations. It is most effective to use this approach as close to the concept design phase as possible. The sample graphs below show common output types from vessel motion analysis. The upper graph shows the probability distribution for exceeding a maximum surge acceleration within a specified time window for a given position on a vessel. The lower graph shows what proportion of time is spent in excess of a given resultant acceleration for a given position on a vessel. In the examples shown the analysis was performed for given significant wave height values. All sea-states of that height which occur at the location of interest were analysed, and the individual probabilities combined and weighted appropriately to give a complete analysis for the wave heights of interest at the location of interest. The analysis shown below is specific to one example, but similar analysis can be tailored to customer needs. It is common to perform similar analysis for resultant and component velocities and positions, as well as accelerations. In addition, analysis can be performed for water motions or wave forces acting on subsea equipment.


Business

Assystem Capabilities