Inspection Approaches & Experience. for Inspecting Challenging Subsea Assets
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1 Inspection Approaches & Experience for Inspecting Challenging Subsea Assets Inspection Approaches & Experience for Inspecting Challenging Subsea Assets Andreas Boenisch Group Managing Director Innospection
2 Inspection Approaches & Experience for Inspecting Challenging Subsea Assets 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
3 Background Inspection Techniques & Tools Splash Zone Inspection Tools (Riser / Caisson / Structure) Subsea Pipelines Inspection Tools Flexible Riser / Riser / Mooring Line Inspection Tools
4 Background Inspection Techniques Saturation Low Frequency Eddy Current (SLOFEC) Typical Operation and detection Pipe Scanning WT range : up to 1 Vessel Scanning WT range : up to 33mm Micro Biological Corrosion (MIC/SRB) Amonium Chloride Salt Corrosion General Corrosion / C02 Corrosion Tank Scanning WT range : up to 30mm through coating up to 10mm Corrosion / Cracking
5 Background Inspection Techniques Principle MEC (extended from SLOFEC) Magnetic Field controlled High Frequency Eddy Current Eddy Current Signal Response Eddy Current sensor EC field controlled Magnetic field Magnetisation Level MEC Magnetisation Level MFL Detection of far side defects Signal Response EC field Magnetic Field Lines - New Sensor type with field strength measurement - Field strength control / analysis (retentivity point) - higher Eddy Current Frequency - higher sensitivity at increased stand
![[meter] 13 14 Flange Weld (FW) 15 16 17 18 24 19 25 20 26 INTERNAL](/docs-images/83/88512121/images/6-3.jpg "DEFECT ANALYSIS 21 27 22 28 23 29 Top of steel (TOS) 30 31 32 33 34")
6 < 20% 20-30% 30-40% 40-60% > 60% Section mm Section mm Section mm Section mm Background Inspection Technique Online Analysis Reporting Color Mapping Report EXTERNAL DEFECT ANALYSIS Distance to GTF [meter] Flange Weld (FW) INTERNAL DEFECT ANALYSIS Top of steel (TOS) Section 5 450mm COLOUR PALETTE DEFECT CLASSIFICATION: Signal of the reference internal defect (50%depth) in the signal Y- component / phase analyse window Client : Location : OIL COMPANY REFINERY Date : K-No. : July/Agust /00 TM SLOFEC - PipeScan Report Subject : Oil Rundown Lines Section : 4 Pipe Identif. : P-53
7 Background Inspection Techniqus MEC Combi Crawler & PipeScanner MEC Combi Crawler MEC MPS200+ MEC-Combi Pipe Crawler V1 MEC-Combi Pipe Crawler V2 MEC Hug Crawler MEC Pole Shoe &Sensor Array Focus: external/internal corrosion Mapping Add on Technique for MEC-Combi concept UT Sensor (single) UT Array Absolute WT Mapping PEC Average WT Mapping Eddy Current Sensor Array Crack Detection Subsea Laser Geometry Scan HD Camera Visual Inspection
8 Inspection Approaches & Experience for Inspecting Challenging Subsea Assets 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
9 Riser Inspection External Scanning of Risers, Conductors, Caissons Top Side Caisson Deployment 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
10 Riser Inspection 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
11 Riser Inspection Coated Riser Inspection MEC-MPS200+ scanner detection capability 6 x 17mm 10mm Stopaq Test Riser CP 1 12 x WT 25.4mm 15mm Neoprene 6 x 17mm 5mm Epoxy Scan Direction
12 Riser Inspection MEC Combi crawler ROV deployed Scanning with MEC & Ultrasonic Sensor arrays MEC Scan vs UT Array Scan
13 Riser Inspection 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
14 Riser Inspection EXTERNAL COATED RISER INSPECTION (integrated cleaning head) M-PS200+ Subsea Scanner system including cleaning head. Rotating Barracuda nozzles at up to PSI.
15 Riser Inspection EXTERNAL CLADD RISER INSPECTION MONEL Clad Riser Scan - Rotational inspection head Defects Carbon Steel 20mm Monel 3mm
16 Inspection Approaches & Experience for Inspecting Challenging Subsea Assets 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
17 MEC-FIT Flexible Riser Inspection Experience MEC-FIT Magnetic Eddy Current Flexible Riser Inspection Tool Wall Loss & Crack detection of steel wire layers
18 MEC-FIT Flexible Riser Inspection MEC-FIT Flexible Riser Inspection Magnetisation Level Comparison of different magnetization levels on the wire magnetization Pressure Sheath Carcass Armoured Layer Pressure Armour Outer Sheath Magnetisation Unit B, Tesla
19 MEC-FIT FLEXIBLE RISER SCANNING MEC-FIT TEST / QUALIFICATION Defects Indication differentiation Crack simulation vs local wall loss Signal Repeatability
20 MEC-FIT Flexible Riser Inspection Artificial defect - crack in single wire in second wire layer wire gap closed for the scan Test Defect : machined crack in second armour layer Tight Crack 50% depth of the wire
21 MEC-FIT Flexible Riser Inspection MEC-FIT Signal Catalogue to date Signal amplitude vs defect size
22 MEC-FIT Flexible Riser Inspection MEC-FIT - Flexible Riser Pipe Inspection Tool V1 - ROV adapted V2 - self crawling: top side or ROV deployed
![5 m to EL 2.5 m) EL [m] 2.5 Mag off horiz.](/docs-images/83/88512121/images/23-2.jpg "Phase Mag on horiz. Phase Mag off vert. Phase Mag on vert.")
![Phase Orientation [deg] Orientation [deg] Orientation [deg]](/docs-images/83/88512121/images/23-3.jpg "Orientation [deg] 360 180 270 90 180 0 270 90 180 0 360 180")
23 MEC-FIT Flexible Riser Inspection Reporting for standard 35⁰ type flexible riser inspection Riser Section 2 ( EL -2.5 m to EL 2.5 m) EL [m] 2.5 Mag off horiz. Phase Mag on horiz. Phase Mag off vert. Phase Mag on vert. Phase Orientation [deg] Orientation [deg] Orientation [deg] Orientation [deg]
24 MEC-FIT Flexible Riser Inspection PROJECT: Subsea Flexible Pipe. Detection of Wire misalignment & wire defects in area of upheaval buckling Comparison of metal loss defect detection for various wire angles Tasks - a 15⁰-flexible pipe structure - detection of wire misalignment - differentiation of wire misalignment vs / defects
25 MEC-FIT Flexible Riser Inspection Missing wires in top layer measured with Differential Sensor Effects of increased lift-off With increases liftoff the signal will get weaker, but not disappear The magnetisation will decrease, but the signal does not depend on it
26 MEC-FIT Flexible Riser Inspection 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
27 Inspection Approaches & Experience for Inspecting Challenging Subsea Assets 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
28 Subsea Pipeline Inspection M-PS200+ MEC-PipeCrawler V2 e.g. Project : 63m length, 10inch pipe, WT 19mm, coated 180 coverage = 1 shift
29 Subsea Pipeline Inspection MEC-Combi Pipe Crawler ROV deployed Self crawling systems with Inspection technology adaptations : SLOFEC, UT, Visual, Laser, PEC
30 Subsea Pipeline Inspection MEC Combi Crawler with Laser system for pipe geometry to scan Scanner with front Laser Input for FEM calculation Scratch Dent
31 Specific Subsea Inspections R&D External Subsea Pipescanning R&D work for larger stand off scanning - i.e. heavy coated Flowlines for localized defect detection TEST # Total stand off to Steel surface [mm] Detection result of 17mm diameter Defect - 8mm depth Test very good Test good Test good Test results of stand off up to 42mm demonstrating detection of the internal defect Test low but visable
32 Subsea Pipeline Inspection 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
33 Inspection Approaches & Experience for Inspecting Challenging Subsea Assets 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
34 Mooring Line Inspection 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
35 Mooring Line Inspection MEC WireScan Mooring Line Scanning with High Field Eddy Current Sensors Flexible Eddy Current Sensor Array System in front of MEC-Combi Pipe Crawler
36 Inspection Approaches & Experience for Inspecting Challenging Subsea Assets 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
37 SUBSEA APPLICATIONS SHIP HULL MEC-Combi Crawler Robot - deployed for FPSO Hull Inspection Automatic Position Control
38 Inspection Approaches & Experience for Inspecting Challenging Subsea Assets 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
39 Specific Subsea Inspections R&D MEC-Combi Robot Concept of the self operating subsea cleaning & inspection system
40 Specific Subsea Inspections R&D Back Side View Cleaning Head with swivel device Drive & Location Wheels Drive & Location Wheels Thruster Thruster Camera/Light Camera/Light Magnet Poles Electronic Control Chambers Eddy Current Sensor Array Boyancy Ultrasonic Sensor Array Tether
41 THANK YOU FOR YOUR ATTENTION Innospection Limited Howemoss Avenue Kirkhill Industrial Estate Dyce - Aberdeen - AB21 0GP United Kingdom P +44 (0) F +44 (0) Web: info@innospection.com
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