In-situ metallography is performed as NDT on actual site with a team comprising of expert metallographers and metallurgists. It is used to find out in-service degradation of critical components of process plants operating under high temperature/ high pressure/ corrosive atmosphere. It provide damage assessments of fire affected equipment of plants. Microstructure survey for critical components viz., Boilers, Pipelines, Reactors and Vessels for condition monitoring and health assessments. TCR can also develop a data bank of critical components of equipment of process plant by periodical monitoring for preventive maintenance and planning for inventory control. TCR can provide suggestions on repair welding of used components of process plants. In-situ metallography checks the microstructure of component for intended service prior to being put in use. In-situ metallography is used for remaining life assessment studies.
Ultrasonic methods of NDT use beams of sound waves (vibrations) of short wavelength and high frequency, transmitted from a probe and detected by the same or other probes. Usually, pulsed beams of ultrasound are used and in the simplest instruments a single probe, hand held, is placed on the specimen surface. An oscilloscope display with a time base shows the time it takes for an ultrasonic pulse to travel to a reflector (a flaw, the back surface or other free surface) in terms of distance traveled across the oscilloscope screen. The height of the reflected pulse is related to the flaw size as seen from the transmitter probe. The relationship of flaw size, distance and reflectivity are complex, and a considerable skill is required to interpret the display. Complex mutiprobe systems are also used with mechanical probe movement and digitization of signals, followed by computer interpretation are developing rapidly.
Ultrasonic examinations are performed for the detection and sizing of internal defects, flaws or discontinuities in piping, castings, forgings, weldments or other components. Exact sizing techniques have been developed to detect and monitor progressive cracking in a variety of equipment.
TCR can also undertake Automated UT using Time of Flight Diffraction
technique (ToFD) in India as per code case 181 for piping, code case 2235 for pressure vessels and API 650 appendix U for storage tanks.
This method employs a penetrating liquid, which is applied over the surface of the component and enters the discontinuity or crack. Subsequently, after the excess penetrant has been cleared from the surface, the penetrant exudes or is drawn back out of the crack is observed. Liquid penetrant testing can be applied to any non-porous clean material, metallic or non-metallic, but is unsuitable for dirty or very rough surfaces. Penetrants can contain a dye to make the indication visible under white light, or a fluorescent material that fluoresces under suitable ultra-violet light. Fluorescent penetrants are usually used when the maximum flaw sensitivity is required. Cracks as narrow as 150 nanometers can be detected.
Magnetic Particle Testing
The Magnetic Particle Inspection method of Non-Destructive testing is a method for locating surface and sub-surface discontinuities in ferromagnetic material. It depends for its operation on the face that when the material or part under test is magnetized, discontinuities that lie in a direction generally transverse to the direction of the magnetic field, will cause a leakage field, and therefore, the presence of the discontinuity, is detected by use of finely divided ferromagnetic particles applied over the surface, some of these particles being gathered and held by the leakage field, this magnetically held collection of particles forms an outline of the discontinuity and indicates its location, size, shape and extent.
Dry magnetic particle examinations and wet fluorescent magnetic particle examinations are performed on ferromagnetic materials to detect surface and slight subsurface discontinuities. Specialized wet fluorescent magnetic particle techniques are available for black light internal examinations of equipment through borescopes.
Liquid Penetrant Examination (PT)
Various types of liquid penetrant examination methods are utilized to detect open or surface cracks or defects in materials. Red dye or fluorescent penetrants are utilized as well as various types of wet and dry developers.
Eddy Current Testing (ET)
Eddy current testing is a rapid and accurate technique used to detect discontinuities in tubing, heat exchangers, condensers, wires, plates, etc. Eddy current testing is also performed for alloy separation and for the determination of treatment conditions. The location of repair welds, girth welds and seam welds may also be detected on ground machined surfaces.
Helium Leak testing in India
is performed to detect and locate leaks in pressure containment parts and structures. This includes welded, brazed, adhesion bonded and other assemblies.
Certified Weld Inspectors (CWI)
TCR's team of Certified Welding Inspectors in India
(CWI) can pinpoint exactly what testing is necessary to qualify a weld, weld procedure, or individual welders. Each welding code follows three main categories of Welding Qualification; Welding Procedure Specification (WPS), Welding Procedure Qualification Record (WPQR), and Welder Performance Qualification (WPQ).
Visual Inspection Services
Non-Destructive visual inspections can be preformed on-site or at the laboratory facility, and are based upon the requirements of the client or specification. Industries utilizing this service include Fabrication, Construction, Automotive, Power Generation and Transportation. Inspections can be performed at the laboratory facility or onsite. These inspections are performed to IS, BS, ASTM, AWS, ASME (American Society for Mechanical Engineers) and many others.
With TCR's state-of-the-art equipment such as laser alignment devices, microprocessor controlled x-ray machines and automatic film processors, we are able to increase the speed, quality and efficiency of our radiographic services.
Per ASTM E110, this testing is normally used for on-site applications or on very large samples. The TCR portable hardness unit performs the hardness testing by applying a 5 kg. Vickers load indenter and electronically converts the values in the preferred scale.