rug 2013 - new tools for offshore qra
DESCRIPTION
New tool for Offshore QRAPhast & Safeti User Conference 2013TRANSCRIPT
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New tool for Offshore QRAPhast & Safeti User Conference 2013
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
Background
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Over the years, DNV has developed a number of tools for safety analysis of Offshore installations
Offshore Hazard and Risk Analysis Toolkit (OHRAT)- First version released in 1992 in direct response to Piper Alpha disaster- Joint industry project with numerous Operators, Consultants and EPCs
Neptune- The OHRAT concept taken into Microsoft Windows environment (1999)
Spreadsheet models (e.g. SOQRATES) (2005+) Phast also used for Offshore consequences
All these tools have their own respective benefits and drawbacks
As a result, in 2009 DNV started discussing a new tool to harness our Offshore experience so far and build a new tool for the future
Welcome to Safeti Offshore - everything DNV knows about Offshore QRA encapsulated within one, comprehensive tool
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
Safeti Offshore A joint collaboration involving significant investment between:
- DNV Advisory Services, providing their Offshore QRA and domain experience- DNV Software, delivering software engineering and mathematical modelling expertise
Design discussions during 2009-2010
Project and coding kick-off January 2011, starting with Proof of Concept First internal release delivered Q1 2013, plus regular ongoing releases Key project goals:
- Develop an integrated and uniform approach to Offshore QRA based upon international standards such as ISO 17776 and NORSOK Z013
- Integration of separate QRA models within one common software tool- Support risk management throughout the lifecycle of an installation from planning to
decommissioning- Provision of a standardised tool building on the well-established Phast architecture
- Benefit from software economies of scale- Develop a new, commercially successful software product
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
Merging of Tools and Competence
SafetiOffshore
Leak
NEPTUNE / SOQRATES
Other Standalone
Tools
EXPRESS
Phast / Phast Risk
New ModelsEXPRESSMODFIRE
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
New Developments and Features
Integrated smoke
modelling
Time varying discharge, with safety systems
Subsea releases
Choice of ignition models 3D viewer
Confined module fire
model
Detailed impairment estimation
Detailed escalation modelling
Escape and Evacuation modelling
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
Whats new in Safeti Offshore? Safeti Offshore incorporates some significant new technology
Offshore asset hierarchy
Automatic release case generation (subject to user defined rules) 3-D graphical input and results viewer
Graphical Event Tree viewer
Powerful data input grid
New mathematical modelling, including:- Improved discharge modelling, allowing for safety systems:
- Detection, isolation and blowdown- Integration of DNV Express, a probabilistic model for module explosions- New compartment fire model taking into account module geometry and flame development- Subsea releases- Escalation modelling
Plus everything else that Safeti contains
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
Leak
LocationIS1-G
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Cumulative Probability of Ignition
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LocationIS1-G\Explosion Target
1.000E-06
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Pressure [bar]
Aggregated Exceedance Probability vs Explosion Overpressure
Small (main)
Medium (main)
Large (main)
New probabilistic explosion model - EXPRESS EXPRESS is used to calculate the following:
- Flammable cloud dispersion in source module (cloud volume)- Detection, Ignition and Explosion probabilities- Explosion Overpressure Exceedance Curves (at each defined target)
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
MODFIRE: 3D Fire Modelling Bridges the gap between existing Phast
fire models and CFD
Builds upon the existing Phast fire models by combining them in new ways
Fires begin in the source module
Fires allowed to develop and escalate beyond the source module:- Overall volume of the flame is conserved
and spread over the platform in accordance with layout and geometry
Also handles scenario where fire walls are damaged or removed by initial explosion prior to fire
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
Safeti Offshore Basic Input Workflow Assets tab:
Define Installation Areas Define Safety Barriers, Walls and Decks Define Escape Routes Define Structural Elements
Process Tab: Define Isolatable Sections Define Equipment items Define Process Case options Define Risers & Pipelines Define Wellgroups
Generate Leak Locations (Scenarios) and Cases (Safety Systems) for each section
Add User Defined Scenarios
Assign Explosion Targets & Vulnerabilities
Define other data: Materials
Weathers
Worker population
Then perform the calculations: Inventory volume Leak frequencies Consequences (Explosion & Fire) Risk
Review results and perform sensitivity analysis
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
Safeti Offshore at a glance
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RIBBON BAR
GRIDASSETHIERARCHY
TABS
3D VIEWER
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
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Lets unpack this a bit more...
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
Ribbon Bar The Ribbon bar
Key interface area in terms of running calculations and viewing results- Includes grid search facility
Allows for staged, sequential model runs- Case definition (Volume, frequency,
screening), Consequence (TVDI, EXPRESS) and Risk
Event trees can be visualized and drilled down into
Results (risk and consequence) can be viewed from the 3D viewer
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
Running Steps
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Data Input(Asset, Process, Weather,
Risk, Material, Parameters)Volume & Frequency
(Process Tab)
Generate Process Leak Locations &
Cases (Right Click on Process Tab)
Volume & Frequency & Screening(Model Tab)
Define Express Targets & Additional Input
(Model tab)
DischargeTVDI
(Model Tab)
EXPRESS Explosion (Model Tab)
Consequence Dispersion(Model Tab)
Risk (Model Tab)
More details later
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
Asset Hierarchy Key element of the tool
This is where the structure/outline of facility is defined
Built in a modular fashion using key objects- Installation- Platform- Areas- Walls- Decks- Structural elements- Escape routes
Key aspect of the tools spatial awareness- Every object has a location- Key characteristics of objects are also defined (notably resilience to impacts) - For example, fire and blast rating for walls and decks (Vulnerability)
Also allows for three release types/locations Topsides, Above sea, Subsea
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
Object definition Walls and Decks
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
Object definition - Areas
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
Object definition Escape Routes
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
Graphical Illustration of the above
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Deck(Upper face)
Area(cuboid)
Wall(Outer face)
Wall(Inner face)
Escape Route
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
Safeti Offshore - Release Locations
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Subsea
Above sea
Inside
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
3D Viewer(facilities) Safeti Offshore provides comprehensive 3D view of platform and results
Key for QA, communication and visualisation of results
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Sea
Sea Bed
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
3D Viewer(facilities)
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
3D Viewer(facilities)
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
3D Viewer(facilities)
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
3D Viewer(facilities)
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
3D Viewer(Consequence Results)
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Explosion overpressure
radii
Fire size & flame effects Smoke and
toxic effects
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
3D Viewer(Risk Results) The 3D viewer also allows for risk
results to be viewed for the object selected
Results available include- PLL- Escalation- Impairment- Personnel - Overpressure
Results are output to a results file- Excel or Access
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
Tabs Safeti Offshore includes 10 tabs
Titles are largely self-explanatory, details not so much
Provide a structured systematic way to organize the data and thus run a QRA
We shall examine two key tabs
Process tab
Risk Tab
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
Process Tab Process tab
- Define Isolatable sections and parts count- Define sizes to consider Small, Medium
or Large- Model as release rate or hole size- Availability of safety systems (Isolation and
Blowdown)- Frequency analysis settings (Full, Limited,
Zero pressure etc.) Automatic case generation of models to
Models tab
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
Risk Tab Risk tab
Where all risk data is defined- Populations- Ignition- Vulnerabilities - Run rows etc.
Failure of barriers also considered - Pressure reduction factor on failure- Deluge parameters
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
Overview of Typical Results (1) Results related to frequency, consequence and risk results
Frequency results- Generally frequencies per year for the specific end events- Grouped frequencies per year according to high-level hazard categories- Grouped frequencies by area of the platform
Consequence results- Discharge, release rate data (by event scenario and safety system) including flow rate,
duration, time varying- Explosion results: EXPRESS / DAL detailed results; overpressure / impact at targets;
escalation result- Fire results: fire and radiation extent; impact at targets; escalation result - Toxic results: dispersion extent; impact at targets- Smoke results: dispersion extent; impact at targets
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
Risk Results Detailed risk results produced for each potential outcome
- IR, IRPA, PLL, Escalation, Impairment, Exceedance Curves (explosion, flammable)- Ignition probabilities (TDIIM) and many more
Work on-going to develop more sophisticated reporting mechanisms
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
Ongoing Risk Consultancy projects with Safeti Offshore DNV now gaining invaluable experience applying Safeti offshore to live projects One significant project currently underway
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
Looking forwards Immediate future:
- Extensive -Testing program, based on real reference projects- Market planning and communication (e.g. DNV Software User Conferences)
Medium-term:- Further consultancy projects- Parallel deployment of Software and Advisory Services to our existing customers
Longer-term:- Ongoing feature development & improvement
- Enhanced user friendliness- Improved calculation runtimes
- Release of new version(s)- Full commercialisation and rollout to broader customer base
Do you have specific needs for your own Offshore QRA analysis?- Please come and talk to us we can add
- New and alternative calculation models- Specific features and customisations
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Det Norske Veritas AS. All rights reserved.
New tool for Offshore QRA
Safeguarding life, property and the environment
www.dnv.com
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