Conventional ndt services

Conventional NDT Services

Ultrasonic Thickness Gauging (Ambient Temperature)

Ultrasonic thickness gauging (UTG) is a method of performing non-destructive gauging (measurement) of the local thickness of a solid element (typically made of metal) based on the time taken by the ultrasound wave to return to the surface. This type of measurement is typically performed with an ultrasonic thickness gauges. We offer on-site thickness gauging services for assessing corrosion in process plant, piping & equipment. We are equipped with state of art ultrasonic thickness gauges having the latest through coat technology where removal of paint from the surface is not required. These gauges have in-built data logger for storing thickness readings, A-Scans, B-Scans which can be later transferred to computer for generating reports.

Applications

Tank inspections
Pipeline inspections
Vessel inspections
Plate inspections

Advantages

Evaluating component wall loss in refineries & chemical Industries.
Quality control of incoming material.
Corrosion mapping of Inservice equipment .
Corrosion monitoring in refinery & gas plant.
Thickness survey in pipeline.

High Temperature Thickness Gauging (Up to 350°C)

Ultrasonic thickness gauging (UTG) at elevated/ high temperature is a special category. Standard transducers are not designed to withstand elevated/ high temperatures and will get damaged / destroyed due to varying thermal expansion coefficients of the materials used to construct them. Variation in material temperature affects sound velocity and accuracy of thickness measurements. We use special transducers & couplant with A-Scan gauges to perform this task.

Applications

High temperature tank inspections
High temperature Pipeline inspections
High temperature Vessel inspections

Advantages

Evaluating component wall loss in refineries & chemical Industries at high temperature.
Corrosion mapping of Inservice equipment at high temperature.
Corrosion monitoring in refinery & gas plant at high temperature.
Thickness survey in pipeline at high temperature.

Ultrasonic Flaw Detection

In ultrasonic testing (UT), very short ultrasonic pulse –waves with center frequencies ranging from 0.1 to 15 MHz are transmitted into materials to detect internal flaws or to characterize materials. Ultrasonic flaw detection (UFD) is often performed on steel and other metals and alloys, though it can also be used on concrete, wood and composites. We offer onsite flaw detection services for inspection of structures, components, welds etc. We are equipped with state of art digital flaw detectors and our technicians are well qualified, certified for reliable & faster inspection.

Applications

Most weld discontinuities including cracks, slag, lack of fusion, lack of bond etc in pipelines, tanks, vessels etc.
To measure intergranular corrosion quantitatively

Advantages

Most sensitive to planar type defects
Test results are known immediately
High penetration capability
Requires access from only one surface

Magnetic Particle Inspection

Magnetic particle inspection (MPI) is a NDT technique for detecting surface and subsurface discontinuity in ferromagnetic materials such as iron, nickel, cobalt and some of their alloys. We offer on-site magnetic particle inspection services using yoke type magnetizing equipment. As per sensitivity required dry visible magnetic particle, wet visible magnetic particle and wet fluorescent magnetic particles are employed during testing.

Applications

Most weld discontinuities open to or near the surface
Most suitable for cracks, laps, seams and other surface or slightly subsurface, discontinuities in ferromagnetic materials

Advantages

Relatively economical and expedient
Test equipment is considered portable
Unlike liquid penetrant, magnetic particle can detect some near surface discontinuities
Can inspect through thin coatings

Liquid Penetrant Testing

Liquid penetrant testing (LPT) is widely applied as low cost inspection method used to locate surface breaking defects in all non-ferrous materials and ferrous materials although for ferrous components magnetic particle inspection is often used. LPT is used to detect casting, forging & welding surface defects such as hairline cracks, surface porosity, leaks in new products and fatigue cracks on in-service components. We offer on-site liquid penetrant testing services using contrast or fluorescent penetrant for highly sensitive inspection.
We offer on-site liquid penetrant inspection services. For detecting of surface breaking cracks, we use both color contrast and fluorescent penetrant for highly sensitive inspection.

Applications:

It is used to inspect metals for surface defects
Weld discontinuities open to surface i.e. cracks, porosity and seams

Advantages

It can be used on a wide variety of materials: ferrous and nonferrous metals and alloys, fired ceramics, powdered-metal products, glass, and some types of organic materials
Portable, relatively inexpensive setup
Expedient inspection results
Results are easily interpreted
Requires no electrical energy except for light source
Indications may be further examined visually

Positive Material Identification (PMI)

Positive Material Identification (PMI) is used to identify the material properties. As a result of a series of accidents resulting from material mix-ups, many companies have instituted stringent Positive Material Identification programs. We offer comprehensive PMI services using latest X-Ray Fluorescence (XRF) analyzers, which are one of the quickest and most comprehensive methods for Positive Material Identification, where low-level radiation is fired at the material and the energy levels, reflected back from each element is measured.

All results are instant and computerized reports are produced at the time of testing.

Applications:

Nuclear and conventional power plants
Refineries or chemical plants.
Metal fabricators that produce pressure vessels, valves and other components.
Manufactures of aerospace components.
Inspection companies performing PMI testing for their customers.
Manufacturers of medical equipment.

Advantages

Material sorting.
Raw material grade identifications.
Changes in the material properties after long operation.
On spot result representation

On-site Hardness Testing

Conventional hardness testers, like Rockwell, Brinell or Vickers machines, require the test piece be brought to the testing device, but this is not always possible. Portable testing devices have been developed that permit in-situ hardness measurements thus offering quick and economical supplements to conventional, stationary testing machines. We offer on-site hardness testing services with portable hardness testers.

Applications

Coatings
Hardened Surfaces
Heat Affected Zones
Castings
Forgings
Sheet metal
Coils

Advantages

On site measurement for quick result.
Visualization of data in multiple unit of measurement.

Ferrite Measurement

Ferrite content measurement, also popularly known as a ferrite scope test it works on the principle of magnetic induction. Feritscope will generate magnetic field which interacts with magnetic component of the specimen inducing voltage proportional to ferrite content.

The measurement of ferrite content provides critical data to prevent any future failure or damage of the steel. Mechanical properties and corrosion resistance depend on the ferrite content in the steel especially at high temperatures. This ferritescope test is useful for industries such as oil and gas, power and process engineering plants that are exposed to high temperature, aggressive media and high pressure.

Applications

Chemical & Petro chemical industry
SS & DSS casting

Advantages

On site measurement for quick result.
Visualization of data in multiple units between WRC-FN, Fe % and α-martensite %

Visual Inspection

Visual Inspection, also known as Visual Testing (VT), is the oldest, most versatile, and most commonly used non-destructive test (NDT) method. Used alone or in conjunction with other test methods, qualified visual inspection is a reliable and highly cost-effective tool for quality control. It is simple, easy to apply, quickly carried out and usually low in cost. The basic principle used in visual inspection is to illuminate the test specimen with light and examine the specimen with the eye. In many instances aids are used to assist in the examination. Visual inspection can be used for internal and external surface inspection of a variety of equipment types, including storage tanks, pressure vessels, piping, and other equipment.

Applications

External visual inspection of pipeline surface, tank surface, vessel surface and structures.
Understanding insulation condition on pipeline, tank, vessel etc.
Understanding external corrosion condition of pipeline, tanks and structures.

Advantages

Quick survey with visual records.
Quick survey with measurable record.

On-site In situ Metallography

In-situ Metallography is used for microstructural analysis while examining large components. The testing allows quick on-site evaluation of a component’s metallurgical and heat treatment condition and assists investigators in carrying out a remaining life assessment study or a failure analysis project.

Applications

Assessing creep damage in elevated temperature components (turbine rotor /discs, steam piping, heat exchanger, chemical reactor, pressure vessels, etc.)

Advantages

The thermal history of the part.
Approximate high temperature range and cooling rates.
Possible mechanical properties.
Crack morphology.
Material, shape, and size of object are not limiting factors for the inspection.
Prolonged heat exposure.
Technique is portable and can be used on-site.