Rapid Deployment System for moniiitoring slilugging in ... 2012 rapid... · Operating principles...
Transcript of Rapid Deployment System for moniiitoring slilugging in ... 2012 rapid... · Operating principles...
Rapid Deployment System f i i l i ifor monitoring slugging in
subsea pipelines
AgendaAgenda
IssueDesign criteriaDesign processDesign processOperating principlesQualification strategySystem descriptiony pFuture applications
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Pulse ServicesPulse Services
Structural Data Delivery Services
What and where does Pulse monitor?What and where does Pulse monitor?
Offshore wind farms
Vessels / platformsTidal generators
Flexible risers
Drilling risers
Free‐standing risers
Drilling risers
Top‐tensioned risers
Steel catenary risers
Mooring lines
Pipelines
Mooring lines
An ACTEON companyAn ACTEON company
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ProblemProblem
Installed deepwater pipeline offshore Australia
After installation the client became concerned about
fatigue life
Potential for VIV and slugging impact at buckle initiation
sleepersp
Wanted to measure movement in order to calculate the
fatigue life
Types of spansTypes of spansFree spans
d f b lUnsupported section of subsea pipelineCaused by:
local sea bed movementlocal sea bed movementPipeline profile does not conform to seabed geometry
Pipeline sleepersPipeline sleepersMethod of preventing lateral buckling on pipelineHowever can cause issues due to slugginggg g
Potential fatigue damage to pipeline Onset of scour Tunnel erosion Lee-wake erosion Equilibrium stage Vortex induced
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Onset of scour Tunnel erosion Lee wake erosion Equilibrium stage
vibration (VIV)Flow induced b ( ) e
eS
W1 W2
e Soil
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vibration (FIV)
Typical System LayoutTypical System Layout
Current Meter
INTEGRIpod‐SM
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Free span monitoring system:Data loggerData logger
Standalone data logger monitoring systemTri axial accelerationTri plane angular rateExternal hydrostatic pressure sensor (for direct changes in water depth)The following parameters can be derived:
Linear displacementA l ti d t tiAcceleration due to motionAverage InclinationHarmonics
Typical battery life of 3 months at 10hz intermittent sampling
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Free span monitoring system:Current meter
Current Meter
Current meter
Measures the speed and direction of ocean currents
Horizontal
direction of ocean currents using the principle of “Doppler shift”.
Upper
Battery Operated20‐30min recording per hour
Lower
2D 3D10
Mechanical InterfaceMechanical Interface
C ‐ ROV deployable on structures
A‐ Diver deployable on chains
B ‐ Diver deployable on risers
D ‐ ROV deployable on structures
E ‐ ROV deployable on pipelines/risers
F ‐ Diver deployable on risers
Free span monitoringRelevant ExperienceRelevant Experience
Humber estuary pipeline (UK) –2005y p p ( )
N th S i li ib ti 2009North Sea pipeline span vibration‐ 2009
Pipeline bundle tow out & span monitoring (Malaysia) ‐ 20092009
Gas pipeline span monitoring (Trinidad) – 2010
Gas pipeline span monitoring (Australia) – 2012‐13 12
Design criteriaDesign criteriaClient required a system to be:
Completely ROV deployableEasy to useQuick to install‐ reducing ROV time/cost Cost effective‐ time and manufactureDeployable at multiple locations
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Design criteriaDesign criteriaDesign Parameter Value
Clamp design life 1 year
Installation depth >1,000m
Buoyant weight <50Kg
Flowline diameter 635mm
Flowline insulation material PolypropyleneFlowline insulation material Polypropylene
Outer pipe finish Smooth
Max pipe inclination 5Degp p g
Max pipe rotation/roll 10Deg
ROV gripper opening distance 97mm
ROV closing force 4092N
Design processDesign process
Conceptual design Client review Constructability
review Prototype testing Qualification
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Clamp / logger holderClamp / logger holder
Clamp / logger holderClamp / logger holder
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Qualification strategy
Axial load test
Qualification strategy
Tortional load test Conformation force within capacity of ROVs manipulatorConformation force within capacity of ROVs manipulatorTested on different pipeline diameters and ovality to h k f t d t lcheck range of expected tolerancesDeflection and structural tests to ensure rugged construction
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Qualification strategyQualification strategy
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Operating principlesOperating principles
Single point ROV grab bars to operate clampAdapter developed to suit a range of ROVs ensuring any ROV can install clampTakes responsibility off the ROV in terms of resulting clamping force
Springs with adjustable pre load Stroke limit plates which effect the closed clamp stroke
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Operating principlesOperating principles
Material‐ no corrosion issues‐ no additional cathodic protection requiredTough plastic‐ structural part of clamp Softer grade of rubber at contact points to give a higher coefficient of frictionAll materials 25 years life span subsea without additional protection and degradation
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Thank YouThank Youwww.pulse‐monitoring.com