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© Copyright Innospection Ltd. 2015
Andreas BoenischGroup Managing Director Innospection
a.boenisch@innospection.com
Inspection Approaches & Experience
for Inspecting Challenging Subsea Assets
Inspection Approaches & Experience for Inspecting
Challenging Subsea Assets
© Copyright Innospection Ltd. 2015
CONTENT
- MEC Technique (from SLOFEC to MEC......Background)
- Riser / Conductor / Caisson Inspection
- Flexible Riser Inspection
- Subsea Pipeline inspection
- Mooring Lines
- Hull Inspection
- Deployment Concept in Splash Zone areas
Inspection Approaches & Experience for Inspecting
Challenging Subsea Assets
© Copyright Innospection Ltd. 2015
Splash Zone Inspection Tools(Riser / Caisson / Structure)
Subsea Pipelines Inspection Tools
Flexible Riser / Riser / Mooring Line Inspection Tools
Background Inspection Techniques & Tools
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Pipe Scanning
WT range : up to 1”
Vessel Scanning
WT range : up to 33mm
Tank Scanning
WT range : up to 30mm
through coating up to 10mm
Saturation Low Frequency Eddy Current (SLOFEC)
Typical Operation and detection
Amonium Chloride
Salt Corrosion
Micro Biological
Corrosion
(MIC/SRB)
General Corrosion
/ C02 Corrosion
Corrosion /
Cracking
Background Inspection Techniques
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Background Inspection Techniques
EC
field
Signal Response
Signal Response
Eddy Current sensor
Magnetic Field Lines
EC
field
Magnetisation Level MFL
Magnetisation Level MEC
Principle MEC (extended from SLOFEC)
Magnetic Field controlled High Frequency Eddy Current
Detection of far side defects
Eddy Current
controlled Magnetic field
- New Sensor type with field strength measurement
- Field strength control / analysis (retentivity point)
- higher Eddy Current Frequency
- higher sensitivity at increased stand
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Online Analysis – Reporting – Color Mapping Report
20-3
0%
30-4
0%
40-6
0%
< 2
0%
> 6
0%
Signal of the reference internal defect (50%depth) inthe signal Y-component / phase analyse window
Sec
tio
n 1
2.2
30
mm
Sec
tio
n 2
1.9
00
mm
Sec
tio
n
33.6
85
mm
Sec
tio
n 4
2.7
20
mm
14
13
15
16
17
18
19
20
21
22
23
Distance to GTF[meter]
Flange Weld (FW)
Top of steel (TOS)
Section 5450mm
24
25
26
27
28
29
30
31
32
33
34
Client :
Location :
Subject :
OIL COMPANY
Oil Rundown Lines
REFINERY
Section : 4
Date :
K-No. :
. :
July/Agust 2000
105/00
Pipe Identif P-53
SLOFEC - PipeScan ReportTM
INTERNAL DEFECT ANALYSIS
EXTERNAL DEFECT ANALYSIS
COLOUR PALETTE – DEFECT CLASSIFICATION:
Background Inspection Technique
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MEC – Combi Crawler & PipeScanner
UT Sensor
(single)
MEC Combi Crawler
HD Camera
Visual Inspection
Background Inspection Techniqus
MEC MPS200+
MEC-Combi Pipe Crawler V1
MEC-Combi Pipe Crawler V2
MEC – Hug Crawler
UT Array
Absolute WT Mapping
PEC
Average WT Mapping
Eddy Current Sensor Array
Crack Detection
Subsea Laser
Geometry Scan
MEC Pole Shoe &Sensor Array
Focus: external/internal corrosion Mapping
Add on Technique for MEC-Combi concept
© Copyright Innospection Ltd. 2015
CONTENT
- MEC Technique (from SLOFEC to MEC......Background)
- Riser / Conductor / Caisson Inspection
- Flexible Riser Inspection
- Subsea Pipeline inspection
- Mooring Lines
- Hull Inspection
- Deployment Concept in Splash Zone areas
Inspection Approaches & Experience for Inspecting
Challenging Subsea Assets
© Copyright Innospection Ltd. 2015
External Scanning of Risers, Conductors, Caissons
External MEC-Combi Tools
deployed by ROV, diver, from top side
- Inspecting wall thickness of 1” (1½ “)
- external & internal localised wall loss detection
- inspecting coated or cladded risers
- general marine growth removal (ROV/diver/ integrated cleaning)
- inspection top side, splash zone & subsea
- Corrosion Mapping
Online Reporting Scan Map
Top Side Caisson Deployment
Riser Inspection
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Coated Riser Inspection – Verification of external & internal & external localized corrosion detection
6” x 18.3mm, 8” x 23mm, 20” x 25,4mm Splashtron coating ½”
External & internal local spherical defect detection results with MEC M-PS200+ scanner
Riser Inspection
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Test Riser CP 1
12” x WT 25.4mm
15mm Neoprene
Scan Direction
Coated Riser Inspection MEC-MPS200+ scanner detection capability
6” x 17mm
10mm Stopaq
6” x 17mm
5mm Epoxy
Riser Inspection
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MEC – Combi crawler
ROV deployed Scanning with MEC & Ultrasonic Sensor arrays
Riser Inspection
MEC Scan vs UT Array Scan
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Riser/Conductor Inspection Report - Assessment support data
External and internal
corrosion detection.
Isolated defects,
areas........
Separate mapping &
Wall loss matrix data in
1mm steps per sensor
Riser Inspection
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EXTERNAL COATED RISER INSPECTION
(integrated cleaning head)
M-PS200+ Subsea Scanner system including
cleaning head. Rotating Barracuda nozzles at up to
10.000 PSI.
Riser Inspection
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EXTERNAL CLADD RISER INSPECTION
MONEL Clad Riser Scan - Rotational inspection head
Carbon Steel
20mmMonel
3mm
Defects
Riser Inspection
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CONTENT
- MEC Technique (from SLOFEC to MEC......Background)
- Riser / Conductor / Caisson Inspection
- Flexible Riser Inspection
- Subsea Pipeline inspection
- Mooring Lines
- Hull Inspection
- Deployment Concept in Splash Zone areas
Inspection Approaches & Experience for Inspecting
Challenging Subsea Assets
© Copyright Innospection Ltd. 2015
Experience
MEC-FIT™Magnetic Eddy Current Flexible Riser Inspection Tool
Wall Loss & Crack detection of steel wire layers
MEC-FIT Flexible Riser Inspection
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Comparison of different magnetization levels on the wire magnetization
Magnetisation Level
Outer Sheath
Armoured LayerPressure Armour
Pressure SheathCarcass
Magnetisation Unit
B, Tesla
MEC-FIT Flexible Riser Inspection
MEC-FIT Flexible Riser Inspection
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MEC-FIT TEST / QUALIFICATION
Defects – Indication differentiation Crack simulation vs local wall loss
Signal Repeatability
MEC-FIT – FLEXIBLE RISER SCANNING
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Test Defect : machined
crack in second armour layer
Artificial defect - crack in single wire in second wire layer
wire gap closed for the scan
Tight Crack 50% depth
of the wire
MEC-FIT Flexible Riser Inspection
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MEC-FIT™ Signal Catalogue to date
Signal amplitude vs defect size
MEC-FIT Flexible Riser Inspection
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V2 - self crawling: top side or ROV deployed
MEC-FIT™ - Flexible Riser Pipe Inspection Tool
V1 - ROV adapted
MEC-FIT Flexible Riser Inspection
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Reporting for standard 35⁰ type flexible riser inspection
Mag on
vert. Phase
090180270360
Orientation [deg]
Mag on
horiz. Phase
090180270360
Orientation [deg]
Mag off
horiz. Phase
090180270360
Orientation [deg]EL [m]
Mag off
vert. Phase
090180270360
Orientation [deg]
90180 1802700 90180 1802700 90180 180270090180 1802700
1
2
1
2
1
2
1
2
Riser Section 2 ( EL -2.5 m to EL 2.5 m)
-2.5
-2.0
-1.5
-1.0
-0.5
0.0
0.5
1.0
1.5
2.0
2.5
MEC-FIT Flexible Riser Inspection
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PROJECT:
Subsea Flexible Pipe.
Detection of Wire misalignment & wire
defects in area of upheaval buckling
Tasks
- a 15⁰-flexible pipe structure
- detection of wire misalignment
- differentiation of wire misalignment vs /
defects
Comparison of metal loss defect
detection for various wire angles
MEC-FIT Flexible Riser Inspection
© Copyright Innospection Ltd. 2015
Effects of increased lift-off
• With increases lift-off the signal will get weaker, but not disappear
• The magnetisation will decrease, but the signal does not depend on it
Missing wires in top layer
measured with Differential
Sensor
MEC-FIT Flexible Riser Inspection
© Copyright Innospection Ltd. 2015
MEC- Combi PipeCrawler V2 – Operations & FAT for Flex Riser
Pipe
Subsea Flex Riser pipe with 15degree wire
organisation. Scanning on the horizontal section to
detect
- wire misalignment
- wire cracking
- wire corrosion
MEC-FIT Flexible Riser Inspection
© Copyright Innospection Ltd. 2015
CONTENT
- MEC Technique (from SLOFEC to MEC......Background)
- Riser / Conductor / Caisson Inspection
- Flexible Riser Inspection
- Subsea Pipeline inspection
- Mooring Lines
- Hull Inspection
- Deployment Concept in Splash Zone areas
Inspection Approaches & Experience for Inspecting
Challenging Subsea Assets
© Copyright Innospection Ltd. 2015
e.g. Project :
•63m length ,
•10inch pipe, WT 19mm, coated
•180° coverage = 1 shift
M-PS200+ MEC-PipeCrawler V2
Subsea Pipeline Inspection
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MEC-Combi Pipe Crawler – ROV deployed
Self crawling systems with Inspection technology
adaptations : SLOFEC , UT, Visual, Laser, PEC
Subsea Pipeline Inspection
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MEC – Combi Crawler with Laser system for pipe geometry to scan
Scanner with front
Laser
Input for FEM
calculation Scratch Dent
Subsea Pipeline Inspection
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External Subsea Pipescanning R&D work for larger stand off scanning - i.e. heavy coated Flowlinesfor localized defect detection
Test 1 15.0 very good
Test 2 21.0 good
Test 3 38.0 good
Test 4 42.0 low but visable
Detection result of
17mm diameter
Defect - 8mm depth
TEST #
Total stand
off to Steel
surface
[mm]
Test results of stand off up to 42mm demonstrating detection of the internal defect
Specific Subsea Inspections – R&D
© Copyright Innospection Ltd. 2015
Subsea PEC Deployment
The SUBSEA PEC is a static measurement with capability to inspect through up to
200mm stand off (coating). Two sensors are guided to scan circumferentially and
axially along the pipe. Pipe Diameter Range 8” – 36 “
Subsea Pipeline Inspection
© Copyright Innospection Ltd. 2015
CONTENT
- MEC Technique (from SLOFEC to MEC......Background)
- Riser / Conductor / Caisson Inspection
- Flexible Riser Inspection
- Subsea Pipeline inspection
- Mooring Lines
- Hull Inspection
- Deployment Concept in Splash Zone areas
Inspection Approaches & Experience for Inspecting
Challenging Subsea Assets
© Copyright Innospection Ltd. 2015
High Field Eddy Curent Sensors
Mooring Line Inspection – Project
Newly developed Eddy Current
sensors to penetrate through
35mm stand off for detection of
– cracks
- localised defects
- galvanisation removal at wires
Mooring Line Inspection
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MEC – WireScan Mooring Line Scanning
with High Field Eddy Current Sensors
Flexible Eddy Current
Sensor Array System
in front of MEC-Combi
Pipe Crawler
Mooring Line Inspection
© Copyright Innospection Ltd. 2015
CONTENT
- MEC Technique (from SLOFEC to MEC......Background)
- Riser / Conductor / Caisson Inspection
- Flexible Riser Inspection
- Subsea Pipeline inspection
- Mooring Lines
- Hull Inspection
- Deployment Concept in Splash Zone areas
Inspection Approaches & Experience for Inspecting
Challenging Subsea Assets
© Copyright Innospection Ltd. 2015
SUBSEA APPLICATIONS – SHIP HULL
Automatic Position
Control
MEC-Combi Crawler Robot - deployed for FPSO Hull Inspection
© Copyright Innospection Ltd. 2015
CONTENT
- MEC Technique (from SLOFEC to MEC......Background)
- Riser / Conductor / Caisson Inspection
- Flexible Riser Inspection
- Subsea Pipeline inspection
- Mooring Lines
- Hull Inspection
- Deployment Concept in Splash Zone areas
Inspection Approaches & Experience for Inspecting
Challenging Subsea Assets
© Copyright Innospection Ltd. 2015
“MEC-Combi Robot” Concept of the self operating subsea cleaning & inspection system
Specific Subsea Inspections – R&D
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Back Side View
Thruster
Cleaning Head
with swivel device
Thruster
Camera/LightCamera/Light
Drive & Location Wheels
Drive & Location Wheels
Eddy Current
Sensor Array
Magnet Poles
BoyancyUltrasonic Sensor
Array
Tether
Electronic Control Chambers
Specific Subsea Inspections – R&D