Inspection Approaches & Experience for Inspecting ... · MEC –Combi Crawler with Laser system for...

© Copyright Innospection Ltd. 2015

Jason TongRegional Sales Engineer, Innospection

[email protected]

Subsea Malaysia 2015

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



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


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


A COMPARISON METHOD

Signal Phase for

top side defects

Calibration defects Indication evaluation compared to calibration

Signal Phase for

far side defects

MEC - Principle


• fast inspection facilitating scanning of large areas efficiently

Scanning speed up to 24m/min

• Sensitive to detection of local metal loss (smaller pitting)

Standard Setting from 5mm/10mm diameter from 10% wall loss

• Distinguishing external / internal wall loss

• “Semi quantitative” relative inspection technique

Inspection result in comparison to calibration

• Wall Loss Display in 10% step (in cases 5% step) classification in full range 0-100%

Standard colour coding

• Typical Accuracy +/- 10% (on fine tuned analysis +/- 5%)

• No need for liquid couplant , general cleaning necessary

• Wall thickness penetration capabilities up to 35mm/42mm (depending on magnetisation)

• Wall loss mapping in c-scan format, individual defects analysed by size and tabled,

matrix data possibility

• Allowing penetration of non electric conductive coatings (qualified to date 15mm)

& conductive cladding (qualified to date 4mm)

CAPABILITIES

MEC - Principle


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

Secti

on

1

2.2

30

mm

Sec

tio

n 2

1.9

00m

mS

ec

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


MEC – Combi Crawler & PipeScanner

UT Sensor

(single)

MEC Combi Crawler

HD Camera

Visual Inspection

Background Inspection Technique

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


CONTENT





- Mooring Lines

- Hull Inspection




Different Deployments for Caisson Inspection

- Typically LAT

- areas ROV can deploy

tool accept clamps/guides

- Caisson in operation

- 2 men operation & ROV

- areas to be generally

cleaned

SUBSEA APPLICATIONS – CAISSONS

External Scanning by

ROV Deployment

Internal Scanning External Scanning

from Top Side

-Above & below water level

-Reaching 100% area

-Caisson out of operation

-Pumps to be pulled

-2 men operation

-Not weather dependant

-Above & below LAT

- down to 1. subsea clamp

-Caisson in operation

-2 men operation & RAT

-weather dependant

-Splash zone cleaned


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


MEC – Combi crawler

ROV deployed Scanning with MEC & Ultrasonic Sensor arrays

Riser Inspection

MEC Scan vs UT Array Scan


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


EXTERNAL CLADD RISER INSPECTION

MONEL Clad Riser Scan - Rotational inspection head

Carbon Steel

20mmMonel

3mm

Defects

Riser Inspection


CONTENT





- Mooring Lines

- Hull Inspection


Subsea Expo 2015


Experience

MEC-FIT™Magnetic Eddy Current Flexible Riser Inspection Technique

Wall Loss & Crack detection of steel wire layers

MEC-FIT Flexible Riser Inspection


Comparison of different magnetization levels on the wire magnetization

Magnetisation Level

Outer Sheath

Armoured LayerPressure Armour

Pressure SheathCarcass

Magnetisation Unit

B, Tesla




MEC-FIT TEST / QUALIFICATION

Defects – Indication differentiation Crack simulation vs local wall loss

Signal Repeatability

MEC-FIT – FLEXIBLE RISER SCANNING


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



V2 - self crawling: top side or ROV deployed

MEC-FIT™ - Flexible Riser Pipe Inspection Tool

V1 - ROV adapted



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- 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



CONTENT





- Mooring Lines

- Hull Inspection


Subsea Expo 2015


e.g. Project :

•63m length ,

•10inch pipe, WT 19mm, coated

•180° coverage = 1 shift

M-PS200+ MEC-PipeCrawler V2

Subsea Pipeline Inspection


MEC-Combi Pipe Crawler – ROV deployed

Self crawling systems with Inspection technology

adaptations : SLOFEC , UT, Visual, Laser, PEC



MEC – Combi Crawler with Laser system for pipe geometry to scan

Scanner with front

Laser

Input for FEM

calculation Scratch Dent



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


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 “



CONTENT





- Mooring Lines

- Hull Inspection


Subsea Expo 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


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


CONTENT





- Mooring Lines

- Hull Inspection


Subsea Expo 2015


SUBSEA APPLICATIONS – SHIP HULL

Automatic Position

Control

MEC-Combi Crawler Robot - deployed for FPSO Hull Inspection


CONTENT





- Mooring Lines

- Hull Inspection


Subsea Expo 2015


“MEC-Combi Robot” Concept of the self operating subsea cleaning & inspection system

Specific Subsea Inspections – R&D


Head Office:

Innospection Limited

–Howemoss Avenue

–Kirkhill Industrial Estate

–Dyce - Aberdeen - AB21 0GP

–United Kingdom

P +44 (0) 1224 724 744

F +44 (0) 1224 774 087

Web: www.innospection.com

[email protected] / [email protected]

THANK YOU FOR YOUR ATTENTION

Innospection (S) Pte Limited

–No. 14 Kwong Min Road

–Singapore(628715)

P +65 6438 8127

M +65 98424350

Singapore Office:

http://www.innospection.com/

mailto:[email protected]

mailto:[email protected]

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