NDT / Inspection
Introduction
With inspection and NDT as the main technical focus of AIS specialist access solutions. We are equipped with the latest advanced processes and will concentrate on developing automated and computer-based techniques that will give more accurate and reliable detection of defects.
With a wealth of experience in this field AIS are able to carry out an on site survey determining the exact requirements of a project.
Phased Array
The distinguishing feature of phased array ultrasonic testing is the computer-controlled excitation (amplitude and delay) of individual elements in a multielement probe. The excitation of multiple piezocomposite elements can generate a focused ultrasonic beam with possibility of dynamically modifying beam parameters such as angle, focal distance, and focal spot size through software. To generate a beam in phase by means of constructive interference, the various active transducer elements are pulsed at slightly different times.
Similarly, the echo from the desired focal point hits the various transducer elements with a computable time shift. The echoes received by each element are time-shifted before being summed together. The resulting sum is an A-scan that emphasizes the response from the desired focal point and attenuates echoes from other points in the test piece.
Ultrasonic
As the frequency increases, the wavelength decreases, which allows for small flaw detection and thickness/location precision. As frequency decreases, the wavelength increases which allows for greater penetration into thick and/or attenuating materials. Other factors such as nearfield length, beam spreading, and beam diameter also affect frequency selection.
Common pulse echo contact techniques such as contact tests of fine grained steels generally utilize 2.25 MHz to 5.0 MHz frequencies. Medium carbon steel castings are generally tested between 1.0 MHz and 5.0 MHz. High carbon and high alloy steels can require lower frequencies in the range of 0.5 MHz to 1.0 MHz. Thin plastics and ceramics tests utilize frequencies to 20 MHz and higher. As a general rule, the wavelength should be equal to or smaller than the minimum size flaw that must be detected.
MPI
Advanced Inspection Solutions specialise in a wide range of NDT Inspection that can be assisted by IRATA Rope Access techniques.
We offer a turnkey solution to NDT Inspection from training, access, Inspection and all related services such as Removal and replacement of Insulation.
Our service is designed to reduce our client’s costs in the short medium and long term.
What is MPI
Magnetic Particle Inspection (MT) is one of the best-known and commonly used methods of NDT. Its aim is to detect the presence of surface braking discontinuities (cracks) in the part under inspection.
Only Ferromagnetic materials can be inspected by the MT method. This is because Ferromagnetic materials develop strong internal magnetic fields when an electrical current is passed through them. An electric current can be introduced in to the test part in several ways.
It can be wrapped in encircling coils and rods or the current can be applied directly with the use of the yoke producing a magnetic field perpendicular to the current flow. When these internal magnetic fields encounter a change in permeability (i.e. an open fissure/crack) the magnetic field is forced outside of the materials surface, and produces flux leakage. This leakage will attract any other Ferromagnetic materials that may be close to the leakage site.
CUI
At AIS we recognise that corrosion under insulation (CUI) is a major problem across industry, therefore with our in house experience we offer the complete service:
- Removal
- Inspection
- Replacement
All works are carried out using highly qualified engineers. We are able to design a bespoke insulation system suitable for each project and we will always look to produce a solution that will aid future inspection, keeping your costs to a minimum.
Visual
Visual Inspection (VI) is one of the most widely used Non-Destructive Testing (NDT) methods. This technique can both work as a preventive and reactive measure. NDT Visual Inspection can also be used in combination with other surface inspection methods for flaws that are not easily identified by the naked eye.
Visual Inspection is an NDT method which may be conducted without the use of special equipment. Visual Inspection is sometimes carried out in conjunction with devices such as low power magnifying glass, boroscopes, fiberscopes, digital video borescopes, camera systems and robotic crawler systems.
Visual Inspection requires experience and know how of failure mechanisms. That is what you will find with AIS. Besides our unequalled reporting systems our experience and professionalism are unique.