Non-Destructive Testing (NDT) refers to methods used to assess the properties of materials, components, or systems without causing damage. These techniques are crucial in the energy sector, particularly in nuclear power, because they enable the identification of flaws and defects that could lead to failure or accidents. Our team of certified technicians performs NDT testing of equipment and welded joints using modern equipment to ensure reliable results and consistent weld quality assurance.
Ultrasonic Testing (UT) – Volumetric Inspection
Ultrasonic testing uses high-frequency sound waves generated by an ultrasonic device and probe to penetrate the material of a welded joint. These waves travel through the material and reflect off internal features and discontinuities. By measuring the time it takes for the waves to pass through the material and return, the exact location and size of internal defects such as cracks, lack of fusion, or porosity can be determined with high precision.
Radiographic Testing (RT) – Volumetric Inspection
Radiographic testing employs ionizing radiation, such as X-rays or gamma rays, to penetrate welded joints and create an image of the material’s internal structure. The resulting radiograph reveals internal flaws like cracks, pores, or inclusions that could compromise the integrity and safety of components. RT produces a permanent record that can be analyzed, archived, and re-evaluated over time.
Radiograph Analysis
Ultrasonic Thickness Testing (UTT)
Material thickness is measured using an ultrasonic thickness gauge from one side of the component. The device sends ultrasonic pulses into the material and calculates the time it takes for the waves to reflect from the opposite surface. This time interval is converted into wall thickness. We use UTT to evaluate the initial or remaining wall thickness of tanks, pipelines, and process equipment, where monitoring corrosion and wear is essential.
Penetrant Testing (PT) – Dye Penetrant Inspection
Penetrant testing detects surface-breaking defects in welded joints by applying a dye penetrant to the material’s surface. The penetrant seeps into surface cracks or discontinuities. After a set dwell time, excess penetrant is removed, and a developer is applied. The developer draws the penetrant back to the surface, making flaws visible. This method effectively reveals cracks, porosity, and cold laps on the surface of materials.
Visual Testing (VT)
Visual testing is the most common and fundamental surface inspection method. It identifies visible flaws, corrosion, deformations, or irregularities in welds, as well as evaluates weld geometry. We use various optical aids and measuring tools, including endoscopes and cameras. Due to its cost-efficiency and simplicity, VT is ideal for regular inspections and serves as a preliminary step before applying more advanced NDT techniques.
Leak Testing (LT) – Weld Leak Testing
Leak testing detects and locates leaks in welds and systems that could lead to pressure or fluid loss. Pressure is applied to the system or component, and the pressure drop is monitored. If a pressure drop is detected, a foaming agent is used. Escaping gas or liquid through leaks causes the agent to form bubbles (bubble test), which are visible to the naked eye, enabling fast and accurate leak localization.
Non-destructive weld testing is also integral to our turnkey EPC contracts. We provide comprehensive quality coordination and supervision, including preparing quality documentation, inspection and test plans (ITPs), WPS/WPQR documentation, and classified equipment quality plans and accompanying technical documentation according to your needs. NDT testing of welded joints directly follows our welding services as part of technical quality control. You can find more information about the welding methods we use and the materials we work with in the section Welding.
We offer these services individually or as part of a comprehensive turnkey EPC contract. An EPC project covers a wide range of services, from engineering and procurement, through technical preparation and equipment manufacturing, to installation and commissioning, including complete documentation. We tailor the project to your specific requirements. Read more in the EPC Projects section.
