TSC is now part of Eddyfi Technologies

TSC develops, designs and manufactures ACFM® equipment to detect surface-breaking cracks in structures and components located above and underwater, up to depths of 2,000m, diver or remotely deployed. Our design and manufacturing processes are certified to ISO9001, so that quality is assured. We know reliability is important, especially when working in remote regions, so our instruments are tough enough to withstand the rigours of the industries we serve - whether you are working in the deserts of the Middle East, on pipelines in Alaska or offshore in the North Pacific.

The ACFM® technique introduces an alternating current into the surface of the component to detect defects. The presence of a crack disturbs the electromagnetic field and the return signal is converted to data, in real time, so that the operator is alerted to the presence of a defect. Immediate defect sizing and recording, in both length and depth, is a major benefit compared to alternative NDT methods.

Customers who choose to use our technology not only have some of the most reliable surface-breaking crack detection products available, but also the back-up and technical support from the world’s leading authority in ACFM® technology.

  • Topside Inspection>
  • Underwater Inspection>
  • Subsea Engineered Solutions>
  • Thread Inspection>
  • Probes>
  • StressProbe™>

Topside Inspection


PACE™ has been developed by TSC to offer operators a robust, hand-held ACFM® instrument with ergonomic design features enabling easy operation, with left or right hand use. As a rugged on-site instrument PACE has a large, high contrast, toughened LCD screen which is ideal for sunlight viewing and is sealed to IP65. With powerful reporting capability and an on-board camera PACE™ is a highly accurate and powerful inspection tool, built with the solo operator in mind.

PACE™ inspection of a crane structure


  • Reliable, repeatable crack detection, accurate defect sizing, length and depth.
  • No daily calibration, just a simple function check.
  • Easy field report generation of defects found.
  • Long life battery (8+hrs).
  • Desktop & in-car charger.
  • 4 secure corner harness points.
PACE™ with 'test plate'


  • Weld Inspection
  • Through Coating NDT
  • Rope Access Inspections
  • Bridges and Infrastructure
  • Cranes and Towers
  • Pipeline Welds
More info...



The AMIGO™ is a rugged site unit delivering all the functionality and advantages of TSC’s Alternating Current Field Measurement (ACFM®) in a portable package.

Reliable crack detection with accurate sizing, in both length and depth, is quickly achieved using a rapid scanning technique with hand held probes. Capable of inspecting through thin metallic coatings and non-conductive coatings several millimetres thick, for a wide range of geometries, the AMIGO™ provides ACFM® solutions for a broad scope of general inspection applications.

Although primarily used for above-water inspection projects, with the use of underwater probes, the AMIGO™ instrument can also be used for shallow-water or splash zone weld.

The AMIGO™ can support a wide variety of single-sensor probes as well as multi-channel array probes. In order to make this technology as accessible as possible these products are available for sale, lease, rent, or supplied as part of our site inspection services.


  • Rapid scanning using a hand-held probe.
  • Reliable crack detection with accurate sizing (length and depth).
  • Reduced cleaning requirements, no need to clean to bare metal.
  • Rugged site unit, IP54 rated.
  • Minimum 5 hour operation on one fully-charged battery pack; simple battery pack exchange in the field.
  • ASSIST™ software (Microsoft Windows®) for ease of operation, compatible with Windows® applications


  • Topside Crack Detection
  • Through Coating NDT
  • Drilling Thread Inspection
  • Storage Spheres and Tanks
  • Rail Track, Wagon and Axles
  • Splash Zone Inspections
  • Subsea Weld Inspection (approx. 40m)
  • Pipelines, welds and damage assessment

Underwater Inspection

TSC has pioneered the deployment of both diver and diverless underwater ACFM®, so whether you need to deliver inspections using ROVs, mini ROV, crawlers or divers, we have the solution.


TSC’s U31™ range of underwater instruments has been developed to provide reliable ACFM® inspection in harsh subsea environments. With a range of standard products covering depths to 3,000m, we have the technology and equipment needed to conduct NDT surface crack detection underwater.

The U31D™ instrument offers all the advantages of ACFM® inspection in a small, light package designed specifically for ease of diver deployment. Capable of inspecting up to 300m depth, the U31D is ideal for inspection of jackets, pipelines and subsea structures.

The U31R™ has been specifically developed for remote subsea deployment using ROVs; working with a selection of ACFM probes – Static Arrays, Swept Arrays and Single element probes. Bespoke probe designs are also available. Rated to 300m water depth, deepwater enclosures are also an option rated to 2000m depth.


  • Rapid scanning using a hand-held probe.
  • Reliable crack detection with accurate sizing (length and depth).
  • Reduced cleaning requirements, no need to clean to bare metal.
  • Capable of inspecting corroded surfaces, or through non-conducting coatings several millimetres thick.
  • Access to a wide range of geometries using TSC’s range of active subsea probes.


  • Subsea Weld Inspection
  • Splash Zone & UWILD Inspection
  • Jacket & Subsea Structures
  • Damage Assessment

Subsea Engineered Solutions

Often our customers are faced with challenges in executing their inspection work programmes and further investigation, product design, delivery and adaptation is needed.

These situations usually require a fundamental understanding of engineering design and assessment of load conditions and failure zones before the optimum inspection method can be devised. To support this need, TSC employs a range of engineers, metallurgists and physicists, and combined with the experience of our Inspection Services team, TSC is able to respond in a highly adaptable way to our customer’s inspection challenges, often resulting in bespoke solutions and assistance with procedural development.


The ACFM® MagCrawler™ represents the latest in ACFM® subsea inspection technology. It has been developed specifically to enable the ROV deployment of TSC’s ACFM® Array Probes to inspect subsea geometries such as circumferential welds in pipes/tubulars, fillet and full penetration welds in plates, all typically found in the oil and gas sectors.


  • On-board 360 rotational head for targeted probe steering
  • Easily manoeuvres diameters greater than 760mm (30ins)
  • Rated for water depths up to 150m (493ft)
  • Tolerant of residual marine growth
  • Instant data capture for comparisons and audit


  • Caisson & Support Structures
  • Ship & FPSO Hull inspection
  • Jack-Up unit Spud Can weld inspection
  • Subsea Pipeline Weld Inspection
  • Splash Zone and restricted access areas


The NodeScanner has been designed, developed and built by TSC engineers to work in tandem with ROV’s, in the deployment of TSC’s ACFM® Array Probes in order to inspect difficult to reach areas and complex geometries such as tubular welded node joints.


  • Designed for use with the U31R and ACFM Array Probe Technology.
  • ACFM probes easily deployed to follow complex node weld profiles.
  • Rated for 100m water depth.
  • Deployment on small and larger brace diameters.
  • Tolerant of residual marine growth.


  • Diverless Inspection of Jacket Structural nodes


The SpoolScanner™ is an example of an ACFM engineered solution delivered as a result of an urgent requirement for the inspection of selected subsea spools at a Gas Field in the North Pacific Ocean, to work with nominated ROVs; enduring very low operating temperatures and harsh climate. Welds were inspected with a type 542 array probe, 50mm scan width, on a compliant mount. The resulting circumferential weld inspections were performed in two minutes.

Thread Inspection

TSC’s ACFM® thread inspection solutions are widely used across the drilling sector for the inspection of threaded components. Our technology requires less cleaning than conventional thread inspection methods and can be used on both magnetic and non-magnetic components. By avoiding the need to clean off all of the dope, this provides significant advantages over conventional thread inspection methods such as MPI and dye penetrants. When you add the ability to store every piece of inspection data for audit and review, this provides a huge advantage both in terms of preparation time and inspection reliability.

For small components that can be rotated during inspection, we offer universal thread probes. In situations where it is undesirable to rotate the component, we offer our Automated Thread Inspection (ATI™), which is field-proven and included in the North Sea Drilling Inspection Standard (NS2). The use of ATI provides our customers with reliable and automated defect detection for a variety of environments under any lighting conditions.


TSC offers a wide range of ACFM® probes, from simple single-sensor probes through to advanced multi-sensor arrays. Our standard frequency probes have been developed to optimise performance on carbon steel components and welds. This probe range also includes high frequency versions of many of our standard probes, which are used for inspecting non-magnetic materials.

With a choice of probes and arrays in above and underwater varieties to suit all purposes, sizes, angles and depths plus a customised option, TSC can supply the right equipment needed for your particular inspection project.


Calibration of an underwater probe for use on 114mm mooring chain offshore Brazil.

StressProbe™ is an electromagnetic method for measuring strain in ferromagnetic metals. When such metals come under load conditions, there is a small change in permeability in the direction of the strain, compared with that orthogonal to it. StressProbe™ was developed by TSC to detect and measure these subtle changes to provide a direct value of strain.

Unlike conventional strain gauges, StressProbe™ does not require bonding to the surface and can be used through non-metallic coatings up to a thickness of 5mm.

The main application for StressProbe™ is the measurement of dynamic strains although strain distributions can be determined in certain circumstances.

StressProbe™ used to map strain distribution on a 16” gas pipeline during a dig.

Features & Benefits

  • Efficient: reusable probe
  • Non-Destructive Testing: minimal surface preparation, only requires removal of loose corrosion products
  • Versatile: can be used indoor, outdoor and underwater
  • Ease of use: convenient static placement of the probe
  • Customised solution: configured for individual applications and specific customer requirements


  • Buried pipeline assessment deployed by in-line inspection tools
  • Dynamic load measurement: Mooring chains, offshore structures, bridges and masts
  • Mapping of strain distribution in civil engineering applications such as bridges and I-beam constructions
  • Structural monitoring of subsea structures