Utilizing multi-element probes, which are individually excited under computer control, a focused beam of ultrasound is generated. Software enables the beam to be steered. Two and three dimensional views can be generated showing the sizes and locations of any flaws detected.

Ultrasonic phased array systems can potentially be employed in almost any test where conventional ultrasonic flaw detectors have traditionally been used.

Weld inspection and crack detection are the most important applications, and these tests are done across a wide range of industries including aerospace, power generation, petrochemical, metal billet and tubular goods suppliers, pipeline construction and maintenance, structural metals, and general manufacturing. Phased arrays can also be effectively used to profile remaining wall thickness in corrosion survey applications.

Widely used in the oil and gas, petrochemical and power generation industries.

TOFD systems use a pair of ultrasonic probes sitting on opposite sides of a weld-joint or area of interest.  The transmitter probe emits an ultrasonic pulse which is picked up by the receiver probe on the opposite side.  In an undamaged part, the signals picked up by the receiver probe are from two waves – one that travels along the surface (lateral wave) and one that reflects off the far wall (back-wall reflection).

When a discontinuity such as a crack is present, there is a diffraction of the ultrasonic sound wave from the top and bottom tips of the crack.  Using the measured time of flight of the pulse, the depth of the crack tips can be calculated automatically by trigonometry application.

Ultrasonic Testing uses high frequency sound energy to conduct examinations and make measurements. This is a very useful and versatile non-destructive testing method. It is sensitive to both surface / subsurface discontinuities and the depth of penetration for flaw detection or measurement is superior to other NDT methods. Our typical UT inspection system consists of several functional units, which provide instantaneous results.

Thickness measurements are performed using a conventional flaw detector and a compression wave probe. The results are determined from the A-Scan. This A-Scan is also used for weld inspection. Our highly qualified and experienced technicians use the most advanced equipment and software for reporting and identification of defects and measurements of various applications for conformity.

Hardness Testing is carried out to determine the strength of various materials. Hardness is generally defined as a measure of the material’s resistance to scratching, deformation, or cutting.

A hardness test gauges this parameter by assessing the depth of an indent or incision made by a precisely shaped indenter applied to the material with an exact amount of force over a specified period of time. Appropriate candidates for hardness tests include structural steel, castings, forgings, welds, weld overlays, piping, machined parts and pressure vessels.

We use digital hardness testers which do not impair the future usefulness of the test piece and can be used when high degree of surface quality is important.

Magnetic Particle Testing is a Non-Destructive Testing method for detection of crack on or just below the surface of ferrous metals. It is a quick and reliable technique for detection and location of surface cracks. It can be applied to relatively rough and dirty surfaces. For maximum sensitivity fluorescent particles are used.

Green NDT Services utilizes Magnetic Particle Testing for all ferrous materials, such as carbon steel, low-alloy and cast iron. The main use of Magnetic Particle Testing is for welds and heat affected zones. We have well trained and experienced MPT technicians who will provide you with confident results.

Liquid Penetrant Testing is used for crack detection to verify compliance and ensure safe operation. The examination involves applying a liquid to the surface of a material and leaving it to rest for a pre-determined period of time. The liquid, is easily visible under normal or special lighting conditions depending on the color.

The penetrant once applied penetrates the defects. When the penetrant fluid is washed off the surface and a developer applied, the defects where the fluid has penetrated are made visible. These spots are called indications. Acceptance criteria define whether or not the indication is non-acceptable (a defect) or not. Green NDT offers this service for both existing and new installation.

Our inspectors are equipped with all of the necessary field instrumentation to provide thorough surveillance. Comprehensive documentation is prepared detailing job quality and progress. This close oversight enables the inspectors to identify potential problems and recommend solutions before the work progresses to a point where costly rework is required.

Our painting inspectors monitor; pre-surface preparation, weather condition effects, surface preparation, confirmation of proper product applicability, product mixing, product application, wet/dry film thickness, recoat times, cure evaluations, product adhesion and coating discontinuities.

Visual Inspection (VI) is the most widely used non-destructive testing technique. Visual inspection is normally the first step in the examination process. Generally, almost any specimen can be visually examined to determine the accuracy of its fabrication, welding, surface defects, corrosion pits, general condition, degradation, blockages and foreign materials.

Visual Inspection means the inspection of equipment and structures using a combination of human senses such as vision, hearing, touch and smell. Green NDT has the necessary experience, expertise and knowledge of failure mechanisms to perform visual inspection.

Hidden defects such as discontinuities and corrosion are significant problems for owners of industrial plants. Discontinuities can result in structural failure in the material integrity of industrial assets or loss of containment, which can be costly in terms of repairs, lost production or contaminated products, environmental damage and potential risk to personnel.

That is why plant operators seek a third-party inspection company that provides a reliable and accurate Non-Destructive Testing method to identify hidden defects and corrosion locations that need to be monitored.

Please contact us to arrange or discuss your third party inspection requirements.