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Conventional Versus Advanced Non Destructive Testing (NDT)

What is Non-Destructive Testing (NDT)?

Non-destructive testing is the process of examining, evaluating materials, and testing for discontinuities. It allows constant monitoring of variations in properties without compromising the part or systems’ serviceability. NDT is frequently used in the industry as a catch-all phrase for non-destructive inspection techniques, inspection equipment, and even the whole subject of non-destructive investigations. Modern nondestructive tests are being utilized in manufacturing, fabrication, and in-service inspections to verify product integrity and reliability, as well as to regulate manufacturing processes, reduce production costs, and maintain a consistent quality level. Now that we have a closer look at what NDT stands for. Let’s delve into some of the details regarding nondestructive testing methods for corrosion monitoring.

NDT Methods for Corrosion Monitoring

NDT involves various methods for gathering different kinds of data, each of which requires its own set of equipment, training, and preparation. Some procedures provide a complete volumetric examination of an item, while others allow just a surface inspection.
Non-destructive testing methods are classified into three categories, such as:

  • Conventional Non Destructive Testing
  • Advanced Non Destructive Testing
  • Remote Visual Inspection

1. Conventional Non Destructive Testing

Many industries, including oil and gas, renewables, rail, construction, fabrication, shipbuilding, steel manufacturing, pharmaceuticals utilize conventional non-destructive testing (CNDT) techniques. Because all of these techniques use materials that are not damaged, all techniques are categorized as conventional NDT. There are a significant number of proven techniques that are frequently practiced. Furthermore, different methods of conventional non-destructive testing are; ultrasonic Inspection, Magnetic Testing, Liquid Penetrant Testing, Eddy Current Testing, and Neutron Radiographic Testing, most of these techniques examine materials using sound or electromagnetic waves.

Advantages of Conventional NDT
  • Safety assurance
  • Accident prevention and reduce costs
  • Quality assurance and asset reliability

2. Advanced Non-Destructive Testing

When conventional non-destructive testing (NDT) techniques are unable to meet the growing demands for the performance, sustainability, and efficiency of facilities, oil and gas plants, pipelines, tanks, boilers, and steel structures, advanced NDT methods come in useful. ANDT inspection techniques make use of cutting-edge equipment and technology to deliver rapid, accurate, and comprehensive data on asset integrity. Advanced Non-Destructive Testing (ANDT) has a greater chance of detecting flaws than conventional inspection techniques. ANDT methods are often used for inspecting and detecting the following: Corrosion mapping, cladding inspection, weld Inspection, Corrosion Under Insulation (CUI) and Hydrogen Attack at High Temperatures (HTHA).

Advance Non Destructive Testing Methods (ANDT)
  • Automatic Ultrasonic Testing
  • Magnetic Flux Leakage
  • Alternative Current Field Measurement (ACFM)
  • Atomic force microscopy
  • Internal Rotational Inspection System Testing
  • Scanning Acoustic Pulse Reflectometry
Advantages of the Advanced Non-Destructive Testing
  • Data is recordable and repeatable
  • Provide intuitive displays
  • Offer better ways to present data and create inspection reports of higher value to clients
  • Increase the safety of facility workers and the general public
  • Can be used for effective risk-based inspection
  • Costs of operation and maintenance are reduced

3. Remote Visual Inspection

Remote Visual Inspection (RVI) – is a nondestructive testing technique utilises remotely controlled cameras and robotic crawlers to evaluate the integrity of components and infrastructure in locations that are either too hazardous or remote for direct human involvement. In RVI, a tiny and often flexible viewing instrument, colloquially referred to as a "scope," is introduced into the inspection region via a small aperture and provides an image for the operator to review. As with other NDE technologies, RVI enables an inspector to identify concealed flaws prior to them causing significant issues. It is primarily used for locating and identifying cracks, erosion, disposition, corrosion, hydrogen blistering, and bacterial contamination

Remote Visual Inspection Methods
  • Comparison Measurement
  • Stereo Measurement
  • Shadow Measurement
Advantages of Remote Visual Inspection
RVI allows examinations for key components, monitoring conditions, and detecting failures that might otherwise result in significant environmental damage and increased danger to human health and safety. Without disrupting service, remote visual inspection enables quick inspections and real-time evaluations.
  • Takes people out of potentially dangerous situations
  • Removes the need for entry into Confined Spaces (CSE)
  • There is no need for scaffolding or working at heights.
  • There is no disassembly or downtime for in-service inspection.
  • Objective data does not depend on the knowledge of the inspector.

Considering everything, detecting cracks, defective welds, tears and connections, tomography, the impacts of surface pollution, and inclusions are all detected with NDT. These methods are cost-effective and time-saving techniques for inspecting changes in material structure and different anomalies. Non-destructive testing (NDT) and corrosion monitoring services in addition to materials testing and welding are provided by Velosi, who has an extensive network of businesses throughout the globe that also includes conventional and advanced non-destructive testing, as well as remote visual inspection (RVI). Velosi has unmatched experience in visual inspection, enabling comprehensive thermal and visual examinations for asset integrity monitoring and quality assurance. Velosi one-of-a-kind RVI services combine the quickest, smartest, and safest techniques available.

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