Providing the latest technology for Tube testing and Analysis on Heat Exchangers, Aerial Coolers, Chillers, boilers and Condensers. 
 

• Austenitic stainless steels

• Duplex stainless steels

• Ferritic stainless steels

• Nickel alloys

• Titanium

• Zirconium
   

Eddy current testing uses the principle of electromagnetic induction to detect flaws in conductive materials. An excitation coil carrying current is placed in proximity to the component to be inspected. The coil generates a changing magnetic field using an alternating current, which interacts with the component generating eddy currents.

Variations in the phase and magnitude of these currents are monitored either by using a second coil, or by measuring changes to the current flowing in the excitation coil.
The presence of any flaw will cause a change in the eddy current field and a corresponding change in the phase and amplitude of the measured signal. In the case of nondestructive testing (NDT), these are displayed on an eddy current flaw detector as a distinct change in signal

Eddy Current Array (ECA) is a form of nondestructive eddy current testing that involves electronically driving eddy current coils placed next to each other in a probe assembly. Each coil in the probe produces a signal, the strength of which depends on the phase and amplitude of the object the probe is placed over. This signal can be measured and the data recorded. This data can then be referenced to an encoded position and time and represented visually as a C-scan image.

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ECA is capable of reproducing the flaw detection techniques of most other eddy current methods. This method though had several distinct advantages such as:

• Being able to scan a larger area at one time while maintaining a high resolution,

• A lesser need for complex robotics to actually move the probe,

• Improved flaw detection due to the C-scan imaging, and

• Complex shapes can be inspected using this method because the probes can be customized to the profile of the part being inspected.

This method is widely used for a number of industry applications. It can be used both measuring the thickness of steels and detecting corrosion. ECA can be used on materials as diverse as vessels, columns, storage tanks & spheres, piping systems, and even structural applications.

IRIS is an ultrasonic technique which requires a couplant. In this case, water. Tubes under test must therefore first be flooded to use this technique. IRIS relies on a transducer to generate an ultrasonic pulse parallel to the axis of the tube under test. It also relies on a rotating mirror that directs the ultrasonic wave into the tube wall. The mirror is driven by a small turbine powered by the pressure of water pumped into the tube.

Part of the ultrasonic wave is reflected by the inner-diameter (ID) wall, while the rest is reflected by the outer-diameter (OD) wall of the tube. Because the ultrasonic velocity of the tube’s material is known, it is possible to assess the thickness of the wall by calculating the difference in times of flight between the two diameters.

As the probe is pulled, the spinning motion of the mirror results in a helical scan path.

A critical aspect of IRIS is ensuring that the mirror is at the center of the tube. An off-center ultrasonic pulse yields a distorted scan image because of the different ID and OD wall sound paths. That’s why our IRIS kits are equipped with centering devices helping operators keep the system centered.

IRIS is commonly used in boilers, shell-and-tube heat exchangers, and fin-fan heat exchanger tubes
 

IRIS testing has several advantages over other types of Inspection:

• Works on all materials, regardless of properties.

• Full sensitivity near tube support structures such as tube sheets.

• Perfect as a backup to electromagnetic testing.

• Very accurate wall thickness measurement results.

Remote field testing (RFT) is a method of nondestructive testing using low-frequency AC. whose main application is finding defects in steel pipes and tubes.[1] RFT is also referred to as remote field eddy current testing (RFEC or RFET).[2] RFET is sometimes expanded as remote field electromagnetic technique, although a magnetic, rather than electromagnetic field is used. An RFT probe is moved down the inside of a pipe and is able to detect inside and outside defects with approximately equal sensitivity (although it can not discriminate between the two). Although RFT works in nonferromagnetic materials such as copper and brass, its sister technology eddy-current testing is preferred.

The basic RFT probe consists of an exciter coil (also known as a transmit or send coil) which sends a signal to the detector (or receive coil). The exciter coil is pumped with an AC current and emits a magnetic field. The field travels outwards from the exciter coil, through the pipe wall, and along the pipe. The detector is placed inside the pipe two to three pipe diameters away from the exciter and detects the magnetic field that has travelled back in from the outside of the pipe wall (for a total of two through-wall transits). In areas of metal loss, the field arrives at the detector with a faster travel time (greater phase) and greater signal strength (amplitude) due to the reduced path through the steel. Hence the dominant mechanism of RFT is through-transmission.

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Main features:

• commonly applied to examination of boilers, heat exchangers, cast iron pipes, and pipelines.

• no need for direct contact with the pipe wall

• probe travel speed around 30 cm/s (1 foot per second), usually slower in pipes greater than 3 inch diameter.

• less sensitive to probe wobble than conventional eddy current testing (its sister technology for nonferromagnetic materials)

• because the field travels on the outside of the pipe, RFT shows reduced accuracy and sensitivity at conductive and magnetic objects on or near the outside of the pipe, such as attachments or tube support plates.

• two coils generally create two signals from one small defect

The main differences between RFT and conventional eddy-current testing (ECT) is in the coil-to-coil spacing. The RFT probe has widely spaced coils to pick up the through-transmission field. The typical ECT probe has coils or coil sets that create a field and measure the response within a small area, close to the object being tested.

Using the latest and most reliable technology for inspections using video or camera for remote or non accessible areas.  Images add a great touch to final reporting.

The principle of the method is that the specimen is magnetised to produce magnetic lines of force, or flux, in the material. If these lines of force meet a discontinuity, such as a crack, secondary magnetic poles are created at the faces of the crack. Where these secondary magnetic fields appear at the surface of the metal, they can be revealed by applying magnetic particles, as a powder, or in a liquid suspension, to the surface. The particles are attracted to the flux leakage and clump round the flaw, making it visible. The particles may be black, or coated with a fluorescent dye to increase their visibilty.

The magnetic flux lines should be at right angles to a flaw to give the best indication, as this creates maximum flux leakage. This governs the choice of a suitable magnetising technique. Often, more than one technique must be used to give a complete inspection.

A flaw attracts more particles if it cuts more magnetic lines of force, so the ability to show a flaw depends on the depth of the flaw, the angle of the flaw to the lines of force, and the magnetic field strength induced during magnetisation. The method is limited to ferromagnetic materials - iron, cobalt and nickel - as other paramagnetic and diamagnetic materials cannot hold a flux which is strong enough to attract particles.

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