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Who We Are

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Sonartech has been serving the petrochemical, mining and power generation industries since 1992.

We are a diversified FULL-SERVICE Non-destructive Testing Company offering Level III services whom is owned and operated by NDT personnel, with a focus on utilizing our abilities and training to minimize our customers' NDT and operating costs.

The essential principles of Sonartech are based on the satisfaction of our clients for all project activities executed under our responsibilities.

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What We Do

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Phased Array

Penetrant Testing

Magnetic Particle Inspection

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Pulse-echo ultrasonic measurements can determine the location of a discontinuity in a part or structure by accurately measuring the time required for a short ultrasonic pulse generated by a transducer to travel through a thickness of material, reflect from the back or the surface of a discontinuity, and be returned to the transducer. In most applications, this time interval is a few microseconds or less. The two-way transit time measured is divided by two to account for the down-and-back travel path and multiplied by the velocity of sound in the test material. The result is expressed in the well-known relationship.

Why should you choose ultrasonic's:

  • It is sensitive to both surface and subsurface flaws
  • The depth of penetration for flaw detection is superior
  • Only single-sided access is needed
  • It is highly accurate in determining size and shape
  • Minimal part preparation is required
  • Electronic equipment provides instantaneous results
  • Detailed images can be produced with automated systems
  • It has other uses, such as thickness measurement
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Phased array (PA) ultrasonic's is an advanced method of ultrasonic testing. The benefits of phased array technology over conventional UT come from its ability to use multiple elements to focus and scan beams with a single transducer. Beam steering, commonly referred to sectorial scanning, can be used for mapping flaws at appropriate angles. This can greatly simplify the inspection of components with complex geometries. The small footprint of the transducer and the ability to sweep the beam without moving the probe also aids inspection of such components in situations where there is limited access for mechanical scanning.

  • Aerospace
  • Power Generation
  • Petrochemical
  • Metal Billet
  • Pipeline Construction
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Is a non-destructive testing method used for surface breaking (slight sub-surface) defects. MPI is fast and relatively easy to apply, and part surface preparation is not as critical as it is for other NDT methods. These characteristics makeMPI one of the most widely utilized non-destructive testing methods, especially suited to in service inspections for thepurpose of locating and identifying fatigue related failures. It is also widely used in the manufacturing / welding industry to locate process faults in weldments, both prior to completing the welding as well as after completion of welding processes and thermal cycles.

Advantages of Magnetic Particle Crack Detection:

  • Simplicity of operation and application.
  • Quantitative
  • Can be automated, apart from viewing.
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Liquid penetrant inspection (LPI), also referred to as dye penetrant inspection (DPI), is a widely applied non destructive testing (NDT) method used to locate surface-breaking defects in all non-porous materials. LPI is used to detect casting and forging defects, cracks, leaks in new products and fatigue cracks on in-service components. DPI is based upon capillary action, where low surface tension fluid penetrates into clean and dry surface-breaking discontinuities (Capillary action). By application of a dry powder developer the penetrant is drawn from the depth of the fissures to show as an indication on the contrasting surface.


  • Mlietals (aluminum, copper, steel, titanium, etc.)
  • Glass
  • Many ceramic materials
  • Rubber
  • Plastics

Liquid penetrant inspection can only be used to inspect for flaws that break the surface of the sample. Some of these flaws are listed below:

  • Fatigue cracks
  • Quench cracks
  • Grinding cracks
  • Overload and impact fractures
  • Porosity
  • Laps
  • Seams
  • Pin holes in welds
  • Lack of fusion or braising along the edge of the bond line

Eddy Current Inspection

Hardness Testing

Magnetic Flux Leakage

Endoscopic Inspection

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of “electromagnetism” as the basis for conducting examinations. One of the major advantages of eddy current as an NDT tool is the variety of inspections and measurements that can be performed. The disadvantages of eddy current is that it can only be used on conductive materials, the surface must be accessible to the probe, the surface finish and roughness may interfere with the results and depth of penetration is limited.


  • Surface Breaking Cracks
  • Metal Thinning (Corrosion)
  • Tube Inspection
  • Conductivity
  • Heat Treat Verification
  • Thickness of Coatings

Advantages of eddy current

  • Sensitive to small cracks and other defects
  • Detects surface and near surface defects
  • Inspection gives immediate results
  • Equipment is very portable
  • Method can be used for much more than flaw detection
  • Minimum part preparation is required
  • Test probe does not need to contact the part
  • Inspects complex shapes and sizes of conductive materials
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Hardness is the resistance of a material to localized deformation. The term can apply to deformation from indentation, scratching, cutting or bending. In metals, ceramics and most polymers, the deformation considered is plastic deformation of the surface. For elastomers and some polymers, hardness is defined at the resistance to elastic deformation of the surface. The lack of a fundamental definition indicates that hardness is not be a basic property of a material, but rather a composite one with contributions from the yield strength, work hardening, true tensile strength, modulus, and others factors. Hardness measurements are widely used for the quality control of materials because they are quick and considered to be nondestructive tests when the marks or indentations produced by the test are in low stress areas.

Applications of hardness testing:

  • Evaluation of carburizing, standard quenching and high-frequency quenching
  • Weld hardness measurement for welded structures (tanks, hulls, bridges, steel towers ,etc.)
  • Hardness measurement for a gear tooth flank (narrow area)
  • Measurement of structural strength or hardness of a facility
  • 100% online inspection for components (engine valves, rack bars, crankshafts, bearings, etc.)
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The FloormapVS2i is a computerized MFL system designed to detect, size and map corrosion on storage tank floors and is currently the most widely operated MFL tank inspection system in the world. The FloormapVS2i delivers significant improvements in terms of defect positioning, electronic data processing and software manipulation. The off-line reporting software package produces a comprehensive yet easy to read report and provides several useful tools to assist with post inspection decision making.

Key Features

  • Automatic CAD Drawing
  • Patch Plate Design Feature
  • Ruggedized Touch Screen Computer
  • Real Time Data Acquisition and Analysis
  • Hard Copy and Electronic Report Function
  • Combined Defect Profiling and Amplitude Analysis
  • Add Data from Visual, UT, Vac Box and MPI Inspection
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Internal inspection of complex technical systems

With borescopes and videoscopes you can inspect hard to reach areas, items that you have no immediate access to and can’t immediately inspect. There would also be a large commercial implication if you were to have to completely dismantle the item in order to get a clear view for the visual inspection.

There is a clear difference between borescopes, fiberscope and videoscopes. The boroscope is a rigid optical instrument, where the fiberscope is more flexible for the situation where you would want to manoeuvre around corners. Videoscopes are the latest in technology when referring to endoscopic/visual inspection and the image is available in real time.

The basic two most common things are inspecting turbine and compressor blades in engines and combustion chamber. When using RVI on the blades you’re looking for cracks from wear or impact. When inspecting a combustions chamber you’re looking for cracks, faulty fuel injectors, or anything that looks like it could be wrong


  • Aviation/Aerospace
  • Automotive
  • Building inspections
  • Plumbing
  • Facilities
  • Marine
  • Power stations

Metallographic Replication

Holiday Testing

Visual Inspection


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Replication is a technique used for inspecting critical engineering surfaces micro structural analysis when examining large components that cannot be easily moved or destructive sample preparation is difficult or not permissible. The technique produces an exact copy of the surface which can be peeled away and examined microscopically in the lab. This technique is used for detecting surface defects such as cracks, fire cracks, inclusions and many others. The replicas are examined by optical or scanning electron microscopy. An additional advantage is that the replicas can be archived, for future reference.


  • Life assessment studies
  • Fire damage assessments
  • Heat treatment condition evaluations
  • Composition verifications.
  • Classification of cast irons
  • Assessment of surface flaws
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The holiday detector is also known as a porosity detector, pinhole tester, spark tester, jeep tester or jeeper. Holiday detectors are employed in the non-destructive detection and location of pinholes, holidays, bare spots or thin points in protective coatings applied for corrosion protection over metal or concrete (conductive) surfaces. Holiday detectors are suitable for production pipeline coating operations, tank work and structures.

Advantages of Holiday / pin hole detectors

  • Simplicity of operation and application
  • Fast - high speed covering large areas
  • detection of small pin hole in coatings and linings
  • Coatings on concrete as well as steel and iron substrates can be tested.
  • Portable
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One of the first, natural, methods of testing of anything we use is visual testing. Almost any specimen can be visually examined to determine correctness of size, completeness, the parts count, and the accuracy of fabrication. In many cases visual inspection will eliminate the need for more sophisticated nondestructive testing of the specimen; for example, if the specimen fails visual inspection, then testing by other methods is unnecessary. Visual testing may locate portions of the specimen that should be inspected further by other techniques.

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Radiography (X-ray) is a non-destructive testing (NDT) method that examines the volume of a specimen. Radiography (X-ray) uses X-rays and gamma-rays to produce a radiograph of a specimen, showing any changes in thickness, defects (internal and external), and assembly details to ensure optimum quality in your operation.


X-rays, generated electrically, and Gamma rays emitted from radio-active isotopes, are penetrating radiation which is differentially absorbed by the material through which it passes; the greater the thickness, the greater the absorption. Furthermore, the denser the material the greater the absorption.


X and Gamma rays also have the property, like light, of partially converting silver halide crystals in a photographic film to metallic silver, in proportion to the intensity of the radiation reaching the film, and therefore forming a latent image.

Welding Inspection

Infrared Thermography

Wall Thickness

Coating Inspection

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Inspects and tests welded joints of work in progress and of completed units for visible defects, correct dimensions, joint strength, bead formation, weld penetration, and conformance with layout, blueprint, and work order specifications, applying knowledge of welding principles and metallurgical properties: Examines joint to detect flaws, such as cracks, cold weld, spatter, and undercuts, using flashlight and magnifying glass.

  • Verifies alignment and dimensions of product and setup of machines and fixtures used for work in progress.
  • Observes techniques and performance of welders in shop or at construction site.
  • Marks defective pieces and recommends scrapping or methods for reworking.
  • Records inspection data.
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Infrared thermography (IRT), thermal imaging cameras detect radiation in the infrared range of the electromagnetic spectrum and produce images of that radiation, called thermo grams. Since infrared radiation is emitted by all objects above absolute zero according to the black body radiation law, thermography makes it possible to see one's environment with or without visible illumination. The amount of radiation emitted by an object increases with temperature; therefore, thermography allows one to see variations in temperature. When viewed through a thermal imaging camera, warm objects stand out well against cooler backgrounds; humans and other warm-blooded animals become easily visible against the environment, day or night. As a result, thermography is particularly useful to military and other users of surveillance cameras.


  • Temperature can be measured in real time
  • It captures as a temperature distribution on a surface, and it can display as a visible information
  • Temperature can be measured from a distance without contacting an object
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Virtually any common engineering material can be measured ultrasonically. Ultrasonic thickness gagging is a widely recognised non-destructive technique used for measuring the wall thickness of a variety of materials. Thickness gauges today are extremely accurate, portable and inexpensive. We at Sonartech only use the best technology the industry has to offer, with calibrated and certified machines we can measure most materials accurately, effectively and economically.


  • Metals
  • Plastics
  • Composites
  • Fiberglass
  • Ceramics
  • Glass
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Coating Inspection - Inspection of applied coating material to ensure that certain characteristics, such as film thickness, hardness, gloss, and color, conform to specification.

  • Discuss inspection results with those responsible for products, and recommend necessary corrective actions.
  • Inspect, test, or measure materials, products, installations, or work for conformance to specifications.
  • Notify supervisors and other personnel of production problems, and assist in identifying and correcting these problems.
  • Discard or reject products, materials, or equipment not meeting specifications.
  • Mark items with details such as grade or acceptance-rejection status.
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Get In Touch

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  27 Begonia Street
       Kempton Park
       South Africa

  Tel: + 27 (0) 11 396 2069

  Cell: + 27 (0) 82 335 9447