Technical Diagnostics and NDT

Enhanced NDT Tube Inspection System is Fast, Easy, and Reliable AcousticEye, the leader in non-invasive tube inspection solutions for the heat exchanger market, has unveiled the Dolphin™ G3 tube inspection system. The G3 is based on the same breakthrough Acoustic Pulse Reflectometry (APR) technology used in the original Dolphin, which has been successfully utilized by customers worldwide since it was first introduced last year. The Dolphin G3 is ideally suited for testing heat exchanger systems across industries such as oil and gas, chemical, and power-generation markets. 

Eddy Current Crack Testing by Criterion NDT  EloScan Robotic Eddy Current Test System by Rohmann GmbH  

"The aerospace industry is leading the way in the application of non-destructive testing techniques" The simplest way to find out about a component’s structural or material properties is to quite literally push it to breaking point. But while destructive testing can be an effective and economical solution for high-volume, low-cost components, it’s clearly undesirable for larger, more expensive systems. If you want to test the limits of a multi-million-pound jet engine, destroying it is a pretty drastic way to advance your knowledge.   NDT is an essential tool in the aerospace industry  Fortunately, there is an alternative. And a range of so-called non-destructive testing (NDT) techniques - which can be used to probe structures and materials either before they enter use or as part of a maintenance programme - are now widely used across a range of engineering sectors.

Eddy current theory is based on electromagnetic induction. That means, a variable magnetic field can induce an electric current on a conductor which is separate to the source of the magnetic field, and also vice versa, which is an electric current generates a magnetic field. Similar theory is used for the magnetic particles inspection as well. Electromagnetic induction is used in many applications such as, Transformers, Electric motors, Generators, etc...   In the field of Non destructive testing (NDT), we manipulate with this theory which I mentioned above, and try to find surface defects or/and shallow internal defects of ferromagnetic materials.

Olympus, a world leader in nondestructive testing technologies and pioneer in industrial phased array ultrasound, is pleased to introduce a comprehensive inspection solution for circumferential welds in pipes with a diameter as small as 21.3 mm OD. A key component of the solution is the COBRA, a new manual scanner specifically designed to

WHEN they were built, no one thought they would fly for so long. But fitted with new engines and avionics, aircraft can be kept going for a very long time. The average age of the world’s airliners is more than ten years, with some passenger jets 25 years old or more. Military planes are more geriatric: the Sikorsky Black Hawk helicopter entered service 31 years ago and the Lockheed C-5 Galaxy 40 years back. Both are still going strong. Some Boeing KC-135 aerial-refuelling planes, which are based on the venerable 707, have been flying for over 50 years. Engineers reckon they could still be in the air when they are 80.  Figure 1: C-5 Galexy One thing that does ground old aircraft is the impending failure of their aluminium structure from metal fatigue. This begins in parts that are subjected to repeated strains, such as where the wings join the fuselage. Constant flexing of the structure concentrates stress, which leads to microscopic cracks. These cracks become more numerous and eve...

First of all let's have a brief look at some of the most common NDT/NDE methods, •Visual inspection: Visual examiners follow procedures that range from simply looking at a part to see if surface imperfections are visible. He can use the help of a magnifying glass or computer controlled camera. It is the most basic method of all. •Liquid penetrant Testing: Engineer evaluates defects on the material surface with help of liquids or sprays. •Eddy Current Testing: Engineer uses equipment with electromagnetic induction to detect flaws in or on conductive materials. •Acoustics methods (mainly ultrasonic, Acoustic emission, Impedance etc…): Engineer uses different forms of acoustic waves (such as sound, ultrasound and infrasound) in order to evaluate defects. You probably have heard of the Ultrasonic sonogram they use in medicine to see the gender of a baby before birth. It certainly is another use of NDT. Figure: Ultrasonic Scanning of a T beam •Magnetic particle crack detection: ...

Diagnostics! Well, yes, we all heard this word very many times in the medicine. There, diagnostics means, identification of the nature of an illness or other problem by examination of the symptoms. As same as Buddha tried to find reason for sadness before cure, doctors try to find reason for illness before cure, Engineers do test and evaluate before thinking a cure for those mechanical objects. It is one of the most important parts of engineering which is closely linked to aerospace engineering, civil engineering, electrical engineering, material science and engineering, mechanical engineering, nuclear engineering, petroleum engineering, physics etc… It’s often used in both constructional and service sides.