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Prakash Monu

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Welcome to our NDT training Institute
"Metal Testing Lab" is committed to provide most effective training with the expertise gained over the past two decades in the inspection of power stations, pressure vessels, structures, engineering components, pipe systems, storage tanks and aerospace components. Our curriculum is formalized to provide custom training programs, best practices leading to gain thorough knowledge in practical Non-destructive testing.

We are providing Level I, II Training and Certification as per Recommended Practice SNT - TC-1A -2006 in the following NDT Methods.

NDT - Central Govt.Approved NABL LAB FOR NDT - The NDT Approach

The NDT INSTITUTE & INSPECTION TECHNOLOGY LTD., (NIITL) is a NDT Course Training specialises in programmed NDT courses at level I and II encompassing both practical and theoretical techniques in the NDT disciplines as listed under the NDT Course METHODS tab on this site.

Non-destructive testing, commonly abbreviated NDT course is simply defined as the testing of materials for surface or internal flaws without causing any destruction or harm to the material under test.

Non-destructive testing is a career field that is relatively obscure in the minds of the general public.


The name seems totally self-explanatory, but most NDT professionals can definitely relate to the experience of trying to explain what non-destructive testing means to family members, friends and acquaintances.

Most students when considering career options are completely unaware that NDT is a very exciting and rewarding career field. `Career’ being the important word.

Every bit of knowledge acquired during training, experience and certification has to be productively put to use and most importantly the learning process never ends.

The NDT Course process relies on the careful approach of the technician, his dedication, thoroughness, perseverance and the usage of sound work procedures referencing codes and specifications.

As a fundamental part of the engineering, manufacturing and in-service process, NDT Course in chennai utilises the human senses of sight, touch and hearing, amplified by a broad selection of equipment and apparatus to interpret and evaluate materials. NDT course is the most widely used chemical and physical inspection method to investigate the composition of materials by means of sound waves, electrical currents, X- and Gamma rays, magnetic fields, thermal waves and tracer liquids directed into and in most cases , penetrating the materials under test.

NDT course is particularly effective at locating performance degrading conditions such as cracking, voids, inclusions, unbonded surfaces, incorrect assembly, incorrect dimension, wall thinning, porosity, incorrect coating thickness, poorly welded fabrications, defects in castings, forgings, rolled products and defects in a host of unlimited manufacturing processes.

Essentially, Non-destructive testing assists in the detection and characterisation of material deficiencies without inhibiting the parts usefulness in any way.


‘NIITL a company with a strong NDT present and a strong NDT future.

The NDT INSTITUTE was founded in January of 2004. As we at NIITL proceed in all our efforts, with unequivocal excellence, I aim to change that opening statement, in time to include, ‘A strong NDT Past’.

Our philosophy is to continually provide thorough and attentive service to our clients bringing the utmost level of integrity to our training efforts and to strive to maintain our knowledgeable position in the ever-changing NDT world. NIITL shall remain productive and always be a contender, employing good work ethics as a foundation for success.

As the founder of the Academy I shall endeavour to instill the highest quality in all aspects of the company. As an independent NDT training facility NIITL possess the flexibility to tailor programs to meet the client’s needs. We shall be of assistance to you, and shall be continually asking ourselves, how can we advantageously improve?

Supporting the NIITL NDT Course training facility, a NDT Certification Committee has been established employing the experience, skills and knowledge of NDT Level III’s and appropriately experienced members of the NDT community in Chennai, India . NIITL - exists as an independent body and has no involvement in the training of students.

With the establishment of the NIITL in compliance with SNT-TC-1A the prime objective in the very near future is to invite and incorporate all other NDT course training facilities and Qualifying bodies in India - NABL . to work together to establish technical harmonisation of NDT course certification. This would inspire greater confidence in the resulting certification which will facilitate mutual recognition and worldwide acceptance of the national NDT Course certificates issued in India.

At NIITL and the MTL we believe in having total transparency in our NDT training Course and certification program, and openly welcome any form of official Audit by any, and all interested parties of the NDT Institute related community at any time. With pride and dynamism we aspire to become the pre-eminent NDT training facility in Chennai. When we become aware of what is possible we begin to realise that success can be achieved, that challenges can be conquered and that problems can be solved. In doing so we open up a completely new set of avenues and possibilities, for ourselves and you.

Albert Einstein said, ‘Imagination is more powerful than knowledge.’ I believe that this is true in many respects because while knowledge allows you to see things as they are, imagination allows you to see things as they could be.

Having said that I shall leave you with the official motto of our country… India, alive with possibility.

One of the most common ways to enhance NDT COURSE visual testing (VT) is through the introduction of highly visible penetrating liquids. These specially prepared liquids, characterized by low a viscosity, easily enter voids open to the surface when the part is dipped into or sprayed by the penetrant.

Relatively simple, inexpensive and reliable, NDT Course liquid penetrant testing (PT) is only used for detecting discontinuities open to the surface. With the correct application, it will detect discontinuities ranging in size from the large to the microscopic.

Liquid penetrant testing:
• NDT Course in chennai is one of the more sensitive nondestructive testing methods for detecting very small surface discontinuities.

• NDT Course in chennai can be used on a wide variety of materials, including ferrous and nonferrous metals, alloys, powdered metal products, glass and some types of organic materials.

• NDT Course in chennai can be performed with relatively inexpensive, unsophisticated equipment. If the area to be tested is small, the test can be conducted with portable equipment.

• NDT Course in chennai is capable of examining all of the exterior surfaces of objects, even of complex shapes, in one operation. Other NDT - nondestructive testing methods require the probing media to be directed to a specific surface or area, whereas liquid penetrant Testing can coat the entire part. Parts that are too large for immersion can be processed by spraying the liquid penetrant materials to provide complete surface coverage.

• NDT Course in chennai is readily adapted to volume processing, permitting 100% testing. Small parts may be placed in baskets for batch processing. Specialized systems may be automated to process as many parts per hour as required.

• NDt Course in chennai magnifies the apparent size of discontinuities, making the indications more visible. In addition, the discontinuity location, orientation and approximate length are indicated on the part, making interpretation and evaluation possible.

• NDT Course in Chennai may be adjusted to provide various sensitivity levels through the proper choice of materials and processing procedures or techniques.

The PT method has several disadvantages and limitations. Inspectors using PT should note that:
• NDT Training Institute in chennai - discontinuities must be open to the surface, as well as free of foreign material that could restrict the entry of the penetrant into the discontinuity.

• NDT Training Institute in chennai - liquid penetrants, emulsifiers (liquids that combine with oil-based penetrants to make them water-washable) and some types of developers may cause skin irritation.

• NDT Training Institute in chennai - liquid penetrants may harm some nonmetallic materials, such as rubber and plastic. There is also the possibility of permanent staining of porous or coated materials.

• NDT Training Institute in chennai - some liquid penetrant materials contain volatile solvents that can produce nausea; thus, adequate ventilation is necessary to remove noticeable vapors, especially in confined areas.

• NDt Training Institute in chennai - liquid penetrants, especially in aerosol form, are flammable. Inspectors must follow manufacture’s recommendations regarding necessary personnel protective equipment when using such equipment.

NDT Training Center in chennai - Magnetic particle testing (MT) is used to detect discontinuities in ferromagnetic parts – namely parts made of iron, steel, nickel, cobalt and the alloys of these materials. Ferromagnetic materials develop strong internal magnetic fields when an electric current is passed through the part. Magnetic particles are applied to the part and a discontinuity that causes a disruption in the induced magnetic field attracts the applied particles, producing an indication.

NDT Training Center in chennai - MT is a highly effective inspection tool that is sensitive to the presence of cracks, laps, seams and similar types of surface and near-surface discontinuities.
NDT Training Center in chennai - Non-relevant indications can sometimes be found near sharp transitions in test part geometry and at metallurgical anomalies introduced during welding due to localized thermal shock, usually associated with the heat-affected zone near welds. Depending on the type of discontinuity and the direction expected, test parts should be examined in two orthogonal (perpendicular) directions because discontinuities must have a major dimension perpendicular to the magnetic field lines of force in order to be detected.

Magnetic particle testing offers the following advantages:
• NDT - low-cost, reliable method for locating surface cracks in ferromagnetic materials.

• NDT - few limitations on size and shape of part.

• NDT - particle size and sensitivity can be adjusted.

• NDT - particles may be in colour or made to fluoresce under ultraviolet radiation.

• NDT - portable if required for field use.

• NDT - can use permanent magnets if no electrical power is available.

• NDT - can use 12 V power sources (car batteries).

• NDT - fairly fast and simple application process.

• NDT - visual interpretation of indications.

• NDT - can detect subsurface discontinuities in some conditions.

Disadvantages of magnetic particle testing include the following:
• NDT - can be used only on ferromagnetic materials.

• NDT - large electrical currents are required for certain test applications.

• NDT - magnetic field must be properly orientated.

• NDT - correct selection and process of application of particles can severely limit sensitivity.

• NDT - too much current is often used, masking discontinuities with spurious indications.

• NDT - false indications often occur in transition areas.

• NDT - burning of parts can occur at contact points, damaging heat treatment and, in severe cases, destroying the part.

• NDT - skin burn may occur from suspension oils.

• NDT - some fire risks occur when using open tanks and oil-suspended particles.

Ultrasonic testing (UT) is used in the testing of nearly all solid materials, such as fine-grained aluminum, steels and alloys, composites and plastics – practically any solid material where detection of internal discontinuities or thickness measurements are of most common concern.

It is also used in the detection of inter laminar separations and regions that have been improperly processed or damaged in layered composite structures.

This technique is less effective with highly in homogeneous and coarse- grained materials (such as concrete and stainless steel castings) and non-elastic materials (such as rubber and soft plastics) that tend to absorb or scatter ultrasonic energy at relatively short distances.

This form of testing has become a commonly accepted approach to wall thickness measurement when access is limited to one side of the material. It is used in the detection and sizing of internal reflectors of ultrasonic pulses and thus is found in the testing of welds, forgings and raw materials in the form of plate, rod, pipe and similar simple geometrical shapes.

Advantages of ultrasonic testing include:
• NDT - high sensitivity to the discontinuities that are most critical to structural integrity. For example, lack of fusion and incomplete penetration in welds are commonly detected. Also, cracks in both welds and bulk material are often very easy to detect.

• NDT - highly portable equipment, which is well suited to field inspection and inspection of in-service structures.

• NDT -application to a broad range of materials.

• NDT -in many cases, the ability to inspect very thick material, as well as the ability to detect discontinuities as small as 0.4 mm (0.016 in.) in diameter.

• NDT -in general access to only one surface is required.

• NDT -results are generated instantly with little or no processing time.

• Ultrasonic testing has several disadvantages and limitations. It should be noted that:

• inspection of complex shapes is very difficult.

• interpretations of UT indications require a high degree of operator training, experience and skill.

• there is a lack of definitive sizing capability, especially for diffuse discontinuities such as porosity or stress-corrosion cracking.

• discontinuities must be favorably orientated with respect to an accessible scan surface.

• a couplant, typically a liquid, must be placed on the scan surface in order for the sound to enter the part.

• typically no permanent record, comparable to a radiograph, is produced.

Inspection techniques using radiographic testing (RT) are some of the most common approaches to visualizing the internal structures of components, materials and assemblies. The approach requires a source of electromagnetic radiation that can penetrate the item being examined during exposure (the time the item is illuminated by the radiation).

Applications for RT are found throughout manufacturing and field-service environments. Raw materials are examined for the presence of internal discontinuities (castings, forgings); fabrications and assemblies are examined for induced discontinuities (welds) and misalignments or absence of internal parts; and inservice inspections use RT for detecting and assessing time-dependant degradation, such as corrosion, cracking and environmental damage.

Radiographic testing provides the following advantages:
• NDT - can easily locate internal structural discontinuities using visual comparison with known geometric features of the test object.

• NDT - is applicable to most classes of materials.

• NDT - is considered by many to be the most universal approach to volumetric examination.

• NDT - yields a visual rendition of internal voids and fabrication errors that is readily interpretable.

• NDT -provides a permanent record of the inspection, including evidence of the sensitivity of the test when the image quality indicators (IQIs) are used.

• NDT - is capable of detecting local changes in thickness and density on the order of 1%, as measured along the line of sight of the X-ray beam.

• NDT - can provide a digital record of the test object for subsequent display on a computer monitor. DISADVANTAGES

Some disadvantages and limitations of radiographic testing include the following:
• NDT - it is a relatively expensive method of nondestructive testing.

• NDT - it is impractical to use on specimens of complex geometry.

• NDT - isolated local discontinuities, with in-line dimensions much less than 2% of the total thickness, are usually not detected.

• NDT - the specimen must lend itself to two-sided accessibility.

• NDT - laminar type discontinuities are often undetected by radiography because they are aligned transverse to the path of radiation.

• NDT - it requires highly trained and skilled personnel.
• NDT - operating licenses issued by state and federal agencies are required.

NDT COURSE IN CHENNAI One of the more widely practiced ET techniques is eddy current testing. The flow of eddy currents is affected by fissures, constrictions or other discontinuities that cause distortions in the cross section through which the current is made to flow. Thus, the eddy current technique is useful for detecting the wall thickness of thin materials as well as measuring localized discontinuities. The thickness of the part must be within the depth of penetration (referred to as the skin depth) of the eddy currents and is dependent upon material properties and operating frequency. It is usually less than 0.635 cm (0.25 in.) and may be very much less, particularly for ferromagnetic materials.

• NDT - Advantages of eddy current testing include the following:

• NDT - provides instantaneous results.

• NDT - uses portable equipment that may be readily adapted to automation.

• NDT - causes no damage to the material.

• NDT - presents no health hazards to the technician.

• NDT - is intrinsically safe as a testing tool, requiring only the coupling of an alternating magnetic field with the component under test to provide the interrogatory medium.

• NDT - Eddy current testing is affected by the following limitations:

• NDT - testing is limited to those metals and carbon fiber composites that are conductors of electrical currents.

• NDT - when the test part is composed of a ferromagnetic material, the depth of penetration into the material is vastly reduced.

• NDT - although discontinuities perpendicular to the surface being scanned are readily detected, discontinuities parallel to the surface, such as laminations, are generally not detected.

• NDT - in ferromagnetic materials, conditions such as work hardening and heat treating tend to introduce large variations in detected signals and may obscure the responses of most interest.

• NDT - Through the use of magnetic saturation techniques, however, many of these kinds of limitations can be removed.

Throughout manufacturing and field inspection, visual testing (VT) is the most widely used NDT method.

The presence of a multitude of potential problem areas can be identified by knowledgeable observers, assisted by devices that magnify, qualify or quantify the conditions being evaluated.

Radiographic Testing (RT)
Ultrasonic Testing (UT)
Magnetic Particle Testing (MT)
Liquid Penetrant Testing (PT)
Visual Testing (VT)
UT of TKY Joints
Radiographic Film Interpretation (RTFI)
Ultrasonic Thickness Gauging (UTG)

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07667978887,044 – 42047244
No 5,Bhoopathy Street,
Chennai-600 092.

Landmark- Opp to Virugambakkam Bus Stop
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