Inspections – NDT / Coatings
/ Flange / Blade
NDT Inspection
Non-Destructive Testing is quite simply a means of assessing the structural integrity or properties of structures or materials without damaging them, although some techniques do require surface coatings to be removed.
The term applies to a range of methods from a straightforward visual inspection, Magnetic Particle inspection, Liquid Penetrant inspection, to more complicated disciplines such as Eddy Current or Ultrasonic Testing.
The various techniques are designed to complement each other to provide the client with complete reassurance of product inspection coverage.
The critical importance to all NDT techniques is the ability (of the technician) to interpret the results generated and to understand where they fit into an assessment of the integrity of the structure as a whole.
This only comes with experience and is an area in which our track record speaks for itself.
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Phased Array – PAUT
Phased Array Ultrasonic Testing (PAUT) is an advanced nondestructive examination technique that uses a set of ultrasonic probes made up of numerous small elements. These elements are pulsed individually with computer-calculated timing, which allows wave steering, focusing, and scanning electronically. PAUT provides a fast and reliable UT inspection solution for flaw detection and characterization.
Time of Flight Diffraction – TOFD
The Time-of-flight diffraction (TOFD) method of ultrasonic testing is a sensitive and accurate technique used for the nondestructive testing of welds for defects. It originated from tip diffraction techniques, which were first published by Silk and Liddington in 1975, TOFD is widely used in the inspection of welds due to its accurate sizing ability. The method utilizes the time of flight of an ultrasonic pulse to determine the position and size of a reflector. By measuring the amplitude of the reflected signal, TOFD can calculate the depth of crack tips using simple trigonometry. During typical TOFD inspections, A-scans are collected and used to create B-scan (side view) images of the weld. TOFD offers rapid weld inspection with excellent flaw detection and sizing capacities.
Welding inspection is a quality control check carried out by welding inspectors. The purpose of welding inspection is to determine if a weldment meets the acceptance criteria of a specific code, standard, or other document. Weld inspection is conducted to ensure that the weld is of the highest quality and meets all required specifications. There are different types of welding inspection and testing.
Radiographic Interpretation (RI)
Radiographic interpretation is the process of analyzing radiographs, which are images produced by radiography testing. It involves three basic steps: detection, interpretation, and evaluation. Visual acuity, which refers to the ability to resolve a spatial pattern in an image, plays a crucial role in all these steps.
Magnetic Particle Inspection (MPI) is an NDT method that is used to detect surface breaking or near surface flaws in ferromagnetic materials or components. This technique involves inducing a magnetic field into a specimen and applying a detection media. The flux leakage is then detectable by the experienced inspector and is evaluated against relevant specifications.
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The Finer Details
Dye (liquid) Penetrant Inspection (DPI)
Similar to MPI, Dye Penetrant Inspection is used to find surface breaking defects but it is predominantly used in non-ferromagnetic materials. Dye is applied to a part for an extended period of time then wiped clean. A developing agent is then applied and inspection is carried out on the “bleed” areas where the dye indicates a surface breaking discontinuity. Dye Penetrant Inspection is a common technique used across multiple sectors.
Ultrasonic Testing (UT)
Eddy Current Inspection (ECI)
Positive Material Identification (PMI)
Positive Material Identification (PMI) is a non-destructive testing (NDT) method that analyzes and identifies the composition and percentage of constituent elements of a metallic alloy. It is used for quality control and safety compliance across various industries. PMI can be performed on-site or on production and in-service components and assets
Coating Inspection (CI)
Coating inspection is the assessment of protective coatings on metal structures to determine the likelihood or severity of corrosion. It is a vital process for all external metal assets to prevent deterioration and uphold safety standards. A coating inspector is someone who evaluates the quality of coatings on various surfaces, including paint, metal plating, and other types of finishes. The inspector must have a keen eye for detail in order to identify any defects in the coating. The primary role of a coating inspector is to judge the conditions where a coating, paint or spray is to be applied and suggest the types of coatings that will protect materials from harsh corrosive environment
Welding Inspection
Welding inspection is a quality control check carried out by welding inspectors. The purpose of welding inspection is to determine if a weldment meets the acceptance criteria of a specific code, standard, or other document. Weld inspection is conducted to ensure that the weld is of the highest quality and meets all required specifications. There are different types of welding inspection and testing.
Case Studies
1SW / NORDEX
Visual and MT Cross Checking of Existing structural Support plates, followed by Cut Out and Full Repair of Retrofit support plates....
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1 Stop Wind
Visual and MT Cross Checking of Existing structural Support plates, followed by Cut Out and Full Repair of Retrofit support plates....
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GE Renewable
Visual and MT Cross Checking of Existing structural Support plates, followed by Cut Out and Full Repair of Retrofit support plates....
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Scottish Power Renewables
Inservice - Bolt Inspection, Circumferential Welds, Flange and Dimensional Survey, Bedframe Structural Inspection. Performing Rope Access UT/PAUT/ET/V...
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