ACFM ARRAY PROBE TECHNOLOGY

WELD INSPECTION DATA Array probe scan on test piece with longitudinal and transverse cracks.

ALTERNATIVE CONTOUR PLOT

REDUCING COSTS FOR OPERATORS REMOTELY DEPLOYED ACFM INSPECTION TECHNIQUES FOR SUBSEA INSPECTION TSC Inspection Systems

THE NEED FOR INSPECTION 11

REMOTE UNDERWATER ACFM INSPECTION TSC s remote inspection capability makes use of ROV s to either carry out the inspection, or place sub-systems that guide the probes while the ROV stands off. TSC develops solutions to suit the specific application, usually based on the TSC toolkit of remote tooling. Remote weld inspection using ACFM has been carried out across a wide range of applications including: Structural node welds on jackets. Caisson inspection. Inspection of welded plate structures. Inspection of mooring systems including chains. Inspection of spud cans.

APPLICATION: 100% INSPECTION OF JACKET NODES Certain jacket nodes are subject to significant dynamic loading and are known as fatigue sensitive nodes Regular inspection is required in order to determine if fatigue cracks have initiated The complex nature of the weld means that probing with an ACFM probe requires access and dexterity beyond the range available from even the best work class ROV s The solution is to use TSC s NodeScanner system. Once placed by ROV the ROV stands back an just monitors inspection progress The dexterity and control of scan parameters is delivered by the NodeScanner 13

FAT OF ACFM NODESCANNER FOR SHELL 14

ACFM NODESCANNER, ROV DEPLOYMENT, 48 INCH BRACE 15

CONDUCTOR INSPECTION Inspection of vertical conductors 18 and 24 inch diameter Armour-wrap protective coating 40mm thick New Video\CONDUCTOR07_25_8 1M_2016-N301_16-07- 24_01-07-13_0 riser scan with miniscsanner.pkt New Video\Blackboxvideo000.pkt 16

ACFM MAGCRAWLER

ACFM MAGCRAWLER EXAMPLE DEPLOYMENT VIDEO 19

CORROSION ASSESSMENT BY PULSED EDDY CURRENT (PEC) TSC now offer subsea corrosion assessment using the Eddyfi Lyft technology Applications include Caisson, pipe line, vessel hull, dock wall, spool corrosion erosion and subsea tanks (MOPU) Can assess wall thickness through substantial coating including fire retardant cladding Works though residual marine growth. Often no cleaning necessary, saving substantial cost Can be deployed alongside ACFM using the same deployment tooling Identifies areas of general corrosion where advanced UT may be then be used to identify pit defects Resolution to 0.1mm Measures average wall thickness under probe Takes approx. 1s to take a reading, allows rapid assessment of large areas such as storage tank wall 20

PROBE HOLDER PUSHED THROUGH MARINE GROWTH 21

THE PEC PROBE HOLDER Robust design Adjustable lift-off Standard ROV attachment with compliant joint Compliant joint limits load on the holder and allows correct alignment with the inspection surface LED indicator shows when acquisition is complete 22

SPOOLSCANNER FOR INSPECTION OF SPOOL WELDS Urgent requirement for weld inspection on 8 and 10 inch spools. Welds are protected with a 2.5mm thick poly-prop coating. ACFM can inspect through the coating. ACFM can be deployed from inspection class ROV. Scanner built to suit ROV and with neutral buoyancy. Circumferential scan performed in two minutes. System performed well up to 90m water depth and in Russian sub zero weather. 23

OFFSHORE DEPLOYMENT OF SPOOLSCANNER 24

INSPECTION OF RISERS THROUGH NEOPRENE COATING

ACFM LINEARSCANNER The TSC LinearScanner has been developed to enable inspection of linear welds Scan length is Typical 200mm per placement put is adjusted per application Movement is by an electric motor driven lead screw ACFM scan movement is well controlled with a selectable scan speed The ACFM Probe is held in a compliant mount so that the probe remains in contact with the inspection surface during the scan. Forces on the probe are also minimised The LinearScanner is positioned by the T4 manipulator. Rubber feet are positioned at either side of the scan so scan line is predictable The LinearScanner can get access to areas too small to allow a crawler and can work in corners 26

K-PLATE INSPECTION (SPUD CAN STRUCTURE) 27

PILE INSPECTION WITH ACFM LINEAR SCANNER

COMPARISON UNDERWATER PROBABILITY OF DETECTION Independent testing confirms that ACFM is Superior to MPI for small defects Identical to MPI for defects over 30mm in length Consistently more reliable than Eddy current

IN CONCLUSION ACFM is a mature and certified technique Surface crack detection and sizing No need to remove and re-apply coatings A variety of methods available to deploy ACFM on subsea structures Cost saving applications; no diver, smaller ROV, easier cleaning Experience with ACFM inspections using ROVs includes: Norwegian Sector of North Sea: Talisman, Repsol, Statoil, Shell, Total Australia: Woodside, Apache UK Sector of North Sea: Shell, Elf, Enquest, Taqa, Britannia Brazil: Petrobras Gulf of Thailand: Chevron Africa: Exxon Mobil, Shell Working with partners to provide inspection service solutions: Fugro, DeepOcean, Subsea 7, DOF, Ocean Installer, HPR, Sonomatic, Oceaneering, Technip, Prezioso Linjebygg, Bluestream et al 30