Non-destructive testing (NDT) is a range of testing and analysis techniques used to evaluate plant and machinery for potential defects, all without causing damage to the equipment in question. This can be as simple as a visual test by a certified NDT inspector, or a more complex type of remote inspection. 

NDT is also known as: 

• Non-destructive examinations (NDE) 
• Non-destructive inspections (NDI) 
• Non-destructive evaluations (NDE).

At Allianz Engineering Inspection Services, our audited, approved NDT inspectors are fully trained to perform a wide range of non-destructive testing methods for asset integrity assessments, including: 

• Visual inspections 
• Remote visual inspections 
• Ultrasonic testing (including Phased Array Ultrasonic Testing [PAUT]) 
• Magnetic particle testing 
• Dye/liquid penetrant testing 
• Eddy current testing 
• Thermal imaging/infrared thermal imaging.

We can carry out our non-destructive testing across practically all types of plant, machinery and work equipment, including: 

• Lifts and lifting equipment 
• Pressure systems 
• Electrical equipment 
• Power presses 
• LEV systems

The best NDT technique depends on several factors: 

• The materials being tested (material characterisation) 
• Surface condition or material finish 
• Accessibility of the plant, machinery or equipment 
• Type of defect (internal, external) 
• Operational conditions 
• Standards and regulations 
• Time considerations 

Our experienced, qualified NDT inspectors work closely with you to understand your equipment and requirements, helping you select the most effective NDT method in every situation.

NDT is essential in industries where component failures can cause substantial harm or significant financial loss. This form of mechanical integrity testing is cost-effective, safe, and supports the long-term performance of your equipment. NDT prevents catastrophic failures and breaches that jeopardise your workforce, damage your property, or cause breakdowns. 

Unlike destructive testing, NDT services ensure that the equipment being inspected is not damaged, so it can continue to operate once faults are resolved. This means you avoid the cost of replacing parts, and tests can be repeated multiple times for the most reliable results.

Situations where you should consider arranging non-destructive testing include: 

• Establishing a baseline for both material thickness and the quality of your manufactured items
• Monitoring the degradation of plant and equipment over time, ensuring that previous lifecycle calculations are valid and that fatigue or corrosion don’t exceed expected levels (e.g. multi-layer weld inspections find signs of erosion or cracking) 
• Ensuring defects are found and removed completely, and that repairs are carried out with the right quality and in line with agreed procedures
• Confirming the weld quality on plant modifications through vessel weld inspections

Furthermore, in some industries, such as aerospace, nuclear power and oil/gas refineries, regular non-destructive testing is mandatory as part of their quality management systems.

• Equipment is undamaged, meaning it can be repaired rather than replaced if faults are detected, or immediately returned to service if found to be working well 
• It identifies problems in your equipment not visible to the human eye, preventing failures that may injure employees, damage property or close production lines.
• It is a very reliable form of testing, and can be performed multiple times to verify results. 
• It helps keep you compliant with relevant industry regulations and standards. 
• It provides thorough documentation for your equipment, necessary for audits and legal investigations. 
• It helps you obtain and maintain certifications that display your commitment to quality and safety.

Non-destructive testing can be useful in practically any industry or working environment, but industries that require these services the most include: 

• Energy 
• Aerospace 
• Petrochemical 
• Manufacturing 
• Marine 
• Transport.

Any business that must ensure the continued safety, compliance and performance of their plant, machinery and equipment should make NDT inspections a priority.

In some instances, yes. Certain visual inspections and non-invasive NDT methods can be performed without shutting down operations, reducing downtime and cost. 

However, more in-depth NDT techniques, particularly internal inspections, may require your equipment to be temporarily shut down, cleaned, stripped and more to provide an accurate assessment. 

Before your test appointment, we will inform you whether this is an in-service inspection or if you need to take any steps prior to our arrival. 

Examples of materials that can be inspected through NDT techniques include: 

• Metals and alloys  
• Composites  
• Rubber   
• Glass and fiberglass  
• Electronic components  
• Welds  
• Castings and forgings. 

Understanding what the material is plays a key role in deciding which NDT method is most suitable for your needs.

NDT techniques can detect numerous types of flaws, weaknesses and problems in plant, machinery and equipment. 

However, some defects and flaws may require more advanced or precise methods to locate. We can work with you to determine a fitting solution if this is the case.

By detecting hidden defects before they can cause serious problems, NDT helps you plan maintenance and repairs to minimise operational downtime. This saves you time, money and prevents unexpected, costly failures.

Our NDT operators are chosen from audited, approved and accredited subcontractors. We ensure that all subcontracted NDT operators hold either a Level 2 or Level 3 NDT Certification, demonstrating their expertise and understanding across all testing methods.

Destructive testing causes permanent damage to the plant, machinery or equipment being inspected, meaning it will no longer be suitable for operation post-testing. 

Non-destructive testing does not cause any damage, meaning all materials and components remain usable once any repairs (if required) are conducted.

Our NDT inspection reports provide detailed information about your equipment and any defects discovered during our examinations, including the defect type, location, size and severity. 

We also include recommendations for corrective action, so you can make proactive repairs to your equipment where required.