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RiserSure: Automated Deployment of Digital
Radiography for Subsea Inspection of Flexible Risers
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Subsea Expo 2020, Aberdeen
Dr. Aman P Kaur, Research Fellow
London South Bank Innovation Centre for Robotics and NDT
Presentation outline
- LSBIC introduction
- The RiserSure project
- Flexible risers and their integrity management
- Automated inspection using RiserSure
- Field trial results
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• R&D robotic technologies for industry – TRL 3-7 typical
• Technology focus: platform mobility, control for autonomy, sensor & energy systems integration, multi-robot systems
• Application: Inspection, maintenance & repair of critical assets
• Portfolio examples: Offshore wind turbine inspection, petro storage tank inspection, crude oil pipeline repair
• Industries: oil & gas, offshore & onshore wind, moorings, shipping, petrochemical storage, nuclear decommissioning, aerospace
London South Bank Innovation CentreRobotics & Automation
Project aims and objectives
To develop a pre-commercial prototype of an automated inspection tool for
flexible risers
- Engineering development; tool & inspection system
- Industrial field trials
- Certification activities
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The RiserSure consortium
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Flexible risers
Flexible flowline are widely used within industry for transporting fluids to & from the sea-bed
Enabling technology for floating platforms in harsh environments
Typical North Sea risers are less than 10” diameter, >90%
58% of flexibles are installed as risers
Most are deployed in shallow applications of 500m depth or less
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SOURCE: ‘Flexlife: Riser End of Life J.I.P.’, FLX-JIP-001-REP-14652-R03, 2013 Balmoral Platform
Flexible risers
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SOURCE: Offshore Energy Today
Source: Qualification of a flexible-
refinforced pipe for 10,000ft
Water depths, Anderson et al, OTC
24160, 2013
Flexible risers are constructed from
multiple layers of different materials in a
manner to build in low bending stiffness
for compliance
Riser failure
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0
0.25
0.5
0.75
1
1.25
1.5
1.75
1 2 3 4
Probability of riser failure
% p
er
opera
tional year
1995-99 2000-04 2005-09 2010-13
Damaged external sheath
Armour wire corrosion
Armour wire breakage
Data indicates there is a 1.5% probability of riser failure
per year in service.
Multiple known modes of degradation and failure.
Breaches to the external polymer sheath are the most
common.
New legislation is driving riser integrity management
The RiserSure concept
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Capsule carrying inspection equipment
Capable of inspection in air and in water to 100m
On-board lighting and camera system
Minimal top side assembly, light weight design
Roll cage
Rotary drive
Actuated wheel
guides
Radiographic inspection
payload
Typical deployment strategy from a floating platform
Inspection capsule
Source Detector
Hardware & control
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Pressure Sensor
Power &
Solenoids
control Hydraulic Power Pack
RS-485
CAN bus
Power + COMUnderwater system
Supervisory control and monitoring GUI
MainsCAN-USB USB relay board 485-USB
AC – 24DC supply
USB-Ethernet hub
Vision Sensors
Monitor & Control
Radiography System
Monitor & Control
Control Valve
Scanner Positioning
Sensor readout
Scanning driver, controller and
feedback
Rotary motor
Power Transmission and
rotary mechanism
Flow DividerManifold
H Cylinder H Cylinder H Cylinder
Holding mechanism
Control signals
Power Control
Riser gripping system
Radiography
scanning module Instrumentation
& camera
Hydraulic power unit
Command
station
Concept to demo
Concept design
March 2018
Prototype
Dec 2018
Field demonstrator
Summer 2019
Set up in the lab
Gripping the riser Radiographic scan Winching
Scanner deployment
Setup & deck
checks
Command
station
Over-boarded
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Sub-sea deployment by WROV
Gamma Radiography
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Linear detector arrayIridium 192 source20Ci (7400GBq) pill
Key benefits
Few material limitations (sea water, polymer & steel)
No part preparation required (marine growth)
Good portability, low power requirement
Internal flaws/discontinuities can be detected
All riser layers can be imaged, full volumetric scan
X-ray, kV
Penetration,
mm γ-ray source
Penetration,
mm
50 1 Yb169 15
100 10 Tm170 10
200 25 Se75 40
400 75 Ir192 100
1000 125 Co60 200
2000 200
8000 300
Penetrating depth of various sources
Gamma Radiography
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Wate
r gap
Wa
ter
gap
Wa
ter
ga
p
Source and detector configuration
Double wall, double image imaging technique
Approximately 50mm total steel thickness
Calibration and synchronisation required for good image quality
Calibrated
Non-calibrated
Inspection data from field trials
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Seeded defect – lead plate
with 5 drilled holes
Radiographic image showing
lead plate and holes
RiserSure: Automated Deployment of Digital
Radiography for Subsea Inspection of Flexible Risers
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Contacts: Dr. Michael Corsar, Centre Director
Dr. Aman P Kaur, Research Fellow
London South Bank Innovation Centre for Robotics and NDT
