Inspection Services

inspection services

The field of Non-Destructive Testing (NDT) is a very broad field that covers a wide range testing services that play a critical role in assuring that structural components and systems perform their functions correctly. Penetrant Testing (PT), Magnetic Particle Testing (MT), Radiographic Testing (RT), Ultrasonic Testing (UT) and Visual Testing (VT) are all types of inspection services provided by NDT Specialists. Depending on your needs, NDT Specialists technicians can perform one or more of these services to meet your testing needs.

Radiographic Testing Gamma & X-Ray (RT)


Radiography involves the use of penetrating X or gamma radiation to examine parts and products for imperfections. An x-ray machine or radioactive isotope is used as a source of radiation, and is directed through a part and on to film. When the film is developed, a shadowgraph is obtained that shows the internal soundness of a part. Possible imperfections show up as density changes in the film, in much the same manner as an x-ray can show broken bones. We have the ability to penetrate up to 15 inches in thickness.

Ultrasonic Testing (UT)

ultrasonic testing service

Ultrasonics use transmission of high-frequency sound waves into a material to detect imperfections or to locate changes in material properties. The most commonly used ultrasonic testing technique is pulse echo, wherein sound is introduced into a test object and reflections (echoes) are returned to a receiver from internal imperfections or from the part's geometrical surfaces.

Ultrasonic inspection is most often performed on steels and metals. It can be used on other nonmetallic materials with success. This form of nondestructive testing is widely used many industries including aerospace, automotive, pressure vessel, and the welding fabrication industry. It can locate subsurface discontinuities in weldments when access to only one side is possible. It has many advantages such as; high penetrating power for going thru very thick parts, high sensitivity for the detection of small discontinuities, only one surface need be accessible, non hazardous to the operator or to nearby personnel, and it is highly portable.

Magnetic Particle Testing (MT)

magnetic particle testing

Magnetic Particle Testing or Magnaflux as it is sometimes called uses magnetic leakage fields to detect surface and subsurface cracks and discontinuities. Magnetic particle testing is done by inducing a magnetic field in a ferromagnetic material and dusting the surface with iron particles (either dry or suspended in a liquid). Surface imperfections will distort the magnetic field and concentrate the iron particles near imperfections, thus indicating their presence. Magnetic particle testing can be brought to your facility or can be performed in out facility, depending upon your application and time frame.

Liquid Penetrant Testing (PT)

pt casting

Liquid Penetrant testing is probably the most widely used NDT method. The test object or material is coated with a visible or fluorescent dye solution. The excess dye is removed from the surface, and then a developer is applied. The developer acts like a blotter and draws penetrant out of imperfections which open to the surface. With visible dyes, the vivid color contrast between the penetrant and the developer makes the "bleedout" easy to see. With fluorescent dyes, an ultraviolet lamp is used to make the "bleedout" fluoresce brightly, thus allowing the imperfection to be seen readily.

Visual and Optical Testing (VT)

Probably the oldest and most common method of NDT is visual examination, which has numerous industrial and commercial applications. Examiners follow procedures ranging from simple to very complex, some of which involve comparison of workmanship samples with production parts. Visual techniques are used with all other NDT methods.

Leak Testing (LT)

leak testing

Several techniques are used to detect and locate leaks in pressure containment parts, pressure vessels, and structures. Leaks can be detected by using pressure gauge measurements, liquid and gas penetrant techniques, and/or a simple soap-bubble test.

Using pressure testing we can determine if castings have leaks by applying a soapy solution to the outside of a piece after it was been sealed and pressurized. We can pneumatically pressurize parts up to 100psi and hydrostatically pressurize them up to 500 psi.

Eddy Current Electromagnetic Testing (ET)

One of the major advantages of eddy current as an NDT tool is the variety of inspections and measurements that can be performed. In the proper circumstances, eddy currents can be used for: Crack detection; Material thickness measurements; Coating thickness measurements; Conductivity measurements for, Material identification, Heat damage detection, Case depth determination, Heat treatment monitoring.

Some of the advantages of eddy current inspection include; 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; Minimal part preparation is required; Test probe does not need to contact the part; Inspects complex shapes and sizes of conductive materials.

Thickness Gauging

thickness gauge

Thickness gauging is used to determine the thickness of different items and detect corrosion that may have occurred on a part that is not open to other types of inspection. Our equipment with internal data logging capabilities allows us to efficiently inspect your project and compile concise reports and drawings.

Identification of Materials (IM)

identification of materials

Through the use of Eddy Current (ET) or Positive Material Identification (PMI), our technicians can help you sort or identify mixed up material in your facility.

ISO/IEC 17025

NDT Specialists is currently accredited to ISO/IEC 17025:2005 through a body that is a signatory to the International Laboratory Accreditation Cooperation