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Advanced Non Destructive Testing

INTRODUCTION…

In the yer 2001 the compny explored the present and future requirements of the industry, in the area of condition monitoring of plnts and equipments and identified a number of advnced technologies from indigenous and foreign sources.

We have a team of energetic and well-qualified Engineers ith extensive field experience. Each of our Engineer is qulified to a minimum of ASNT level II in NDT Techniques. we have among our panel of advisors,highly qualified and experienced ASNT-Level III personnel to study the testing requirements, develop the appropriate procedures and to train our technicians in implementing the procedures competently.

SERVICE RANGE…

We are pioneers in NDT Service offering advanced Non-Destructive Testing such as:

Computerizes Ultrasonic Corrosion Mapping C-Scan & B-Scan.

The data acquired for scanning is processed in real time and C-Scan view of the material (plate or pipe) being inspected develops on the computer screen as the scanning proceeds. C-Scan gives the image of the flaws in the material on the Plan View, i.e. as seen from the direction of scanning. The view gives changes in thickness of material due to far side corrosion, and also planar defects parallel to the entry surface. The discontinuities detected are :- Laminations, Lamellar Tears and hydrogen induced cracking.

TOFD Technique for Flaw Detection and Evaluation.

The TOFD technique is a fully computerised system able to scan, store and evaluate indications in terms of height, length and position with a grade of accuracy never achieved by other ultrasonic techniques.

The technique is based on diffraction of ultrasonic waves on tips of discontinuities, instead of geometrical reflection on the intraface of the discontinuities.

This phenomena makes TOFD idle for identifying cracks, lack of fusion located along the vertical access of the weld (in particular for narrow gap preperation) or with any other orientations, because detection is not affected by the negative consequences of ultrasonic beam deviation from the reciever due to unfavourable orientation of the discontinuity. These features have extended the use of TOFD to replace radiography and complex ultrasonic inspections by tandem technique wherever planar defects (cracks, lack of fusion) are the main object of examination TOFD overcomes both techniques in terms of speed of examintion and higher accuracy.

Phased Array Ultrasonic Inspection

A method for inspecting a component includes existing a number of transducersforming an array to produce an ultrasonic transmission being focused into the component. The array and the component are seperated by a standoff. A number of echo signals are generated using the transducers, and the echo signals are processed in a number of channels. The processing includes both dynamical focus and providing a dynamic aperture on receive, both of which compensate for refraction of the beam at the component/standoff interface. A single-turn inspection method includes:(a)positioning the arry facing the component, (b)exciting the transducers, (c) generating a number of echo signals, (d) chnging the relative angular orientation of the array and the componentaround an axis and repeating steps (b) and (c), and (e) processing the echo signals to form at least one processed echo signal.

Magnetic Flux Leakage Testing of steel Wire Ropes

Magnetic flux leakage (MFL) is a magnetic method of nondestructive testing that is used to detect corrosion and pittting in steel structures, most commonly pipelines an storage tanks. The basic principle is tht a powerful magnet is used to mgnetize the steel at areas where there is corrsion or missing metal, the magnetic field “leaks” from the steel. In MFL tool magnetic detector is placed between the poles of the magnet to detect the leakage field.

Magnetic NDT of wire ropes has been in regular use in a number of countries for inspection of hoisting ropes in deep mines and inspection of ropeways. recently used method is based on magnetization of the rope with permanent magnets and detection of the changes of magnetic field around the rope and total magnetic flux. Discontinuity in the rope, such as broken wire or corrosion pit creates radial magnetic flux leakage and the sensor detects it as the rope passes through the sensing head. Other sensor measures total axial mgnetic flux in the rope. It provieds information about loss of steel due to missing wire, continuous corrosion or abrasion.

Eddy Current Remote Field Testing of Installed or loose Het Exchanger Tubes

Eddy current inspection is one of several NDT methods that use the principal of “electrmagnetism” as the basis for conducting examinations.Eddy currents are created through process called electromgnetic induction.When alternating current is appiled to the conductor, such as copper wire, a magnetic field develops in and around the conductor. This magnetic field expands as the alternating current rises to mximum and collapses as the current is reduced to zero. If another electrical conductor is brought into the close proximity to this changing magnetic field, currentwill be induced in this second conductor. Eddy currents are induced electrical current that flow in a circular path. they get their name from “eddies” that are formed when a liquid or gs flows in a circular path around obstacles when conditions are right.

Long Range Guide Wave Ultrasonic Inspection System

Corrosion and other defects that reduce the cross-sectional area of pipes cause major problems in the oil, chemical and the other industries. Most standard NDT methods measure the remaining pipe wall accurately, but over a small area so it is almost always uneconomic to inspect 100% of the pipe. In practice a pragmatic approach is usuall adopted where the wall thickness at a number of points is measured and this information is used to determine the fitness for purpose of the pipe. however, this approach generally requires unrestricted access to the outer surface of the pipe and this is not possible, if the pipe is insulated, has protective coatings or is buried.

This mens that even external corrosion cannot be seen so that accurate measurements of the remaining wall can be made at the correct loction on the pipe. Ultrasonic guided Wave inspection offers a novel solution to many such inspection problems. Guided Waves can be excited from easy to access locations on the pipe and will propagate many meters along the pipe, the returning echooes indicating the presence of corrosion or other pipe features.

Automated Ultrasonic Testing(AUT)

Ultrasonic testing is a technology that has rapidly acquired industry acceptance as a valid method of NDT weld testing and inspection. This technology has resulted in Automted ultrasonic Testing taking over the traditional inspection methods in the onshore and offshore pipeline inspection markets. The detection of cracks, flaws,leaks, corrosion and pitting in pipeline welds can be completed more quickly,more accurately, and more affordable than ever before.AUT is the most advanced multi-probe technology in order to provide our customers with the highest quality AUT data using software that is fully integrated with high-end IT platforms accessible anywhere in the world.AUT is a multi-probe system incorporating the TOFD function. Once your pipeline welds are automatically tested, the data is transmitted to an operator to be audited, verified and approved.Mainlines, repairs or tie-ins can be tested in a continuous cycle with no costly delays to you. Pipeline integrity is ensured with enhanced testing processes.ss