Weldcheck Technologies Sdn Bhd
Services
ADVANCED NDT SERVICES
Digital Radiographic Testing
The method is similar to conventional radiography, but images are not captured on film. Instead, images are captured using either flat panel detectors or phosphor-coated imaging plates. Digital radiography has several important benefits as images can be enhanced and magnified for viewing and interpretation of findings.
Inspectors can provide you with instant reporting and digital images allowing for easy data sharing. Images can be emailed so that work can continue across times zones or sent to off-site experts for simultaneous evaluation. In addition, digital images can be archived electronically so they are easier to store, trace and view. Because there are no radiographic films to store, digital radiography can also save on the physical storage space that would normally be required for conventional film.
Applications
- Profile Radiographic for corrosion monitoring inspection
- Process Pipelines Corrosion Findings
- No need to remove insulations
- Weld Inspection for Quick Review
- Corrosion, Pitting in insulated piping
Personnel Qualification
- PCN Level II
- JPK Level I or JPK Level II
- ASNT Level II or ASNT Level III
Computed Radiographic Testing
Computed radiography Testing (CRT) is used to assess internal or external corrosion/erosion losses in process piping, pressure vessels and valves. Based on it, one can estimate remaining thickness and wall losses. The computerized images allow easy data sharing and result in significant improvements in radiographic inspection productivity as well as faster identification of defects.
Applications
- Profile Radiographic for corrosion monitoring inspection
- Process Pipelines Corrosion Findings
- Weld Inspection for Quick Review
- Corrosion, Pitting in insulated piping
Personnel Qualification
- PCN Level II
- JPK Level I or JPK Level II
- ASNT Level II or ASNT Level III
Phased Array Ultrasonic Testing (PAUT)
Phased Array Ultrasonic Testing (PAUT) is an advanced NDT method that is used to detect discontinuities i.e. cracks or flaws and thereby determines component quality. Due to the possibility to control parameters such as beam angle and focal distance, this method is very efficient regarding the defect detection and speed of testing. Apart from detecting flaws in components, phased array can also be used for wall thickness measurements in conjunction with corrosion testing.
Applications
- Inspection of welds (Structural/Piping)
- Thickness measurements
- Corrosion inspection
- PAUT in lieu of Radiography Testing (ASME Sec VIII, ASME B31.3, B31.1)
Personnel Qualification
- PCN Level II or PCN Level III
- CSWIP Level II or CSWIP Level III
- ASNT Level II or ASNT Level III
Time of Flight Diffraction (ToFD)
Time of Flight Diffraction (ToFD) systems, a pair of ultrasonic probes are used, sitting on opposite sides of a weld-joint or area of interest. A transmitter probe emits an ultrasonic pulse which is picked up by the receiver probe on the opposite side. In an undamaged part, the signals picked up by the receiver probe are from two waves: one that travels along the surface (lateral wave) and one that reflects off the
far wall (back-wall reflection). When a discontinuity such as a crack is present, there is a diffraction of the ultrasonic sound wave from the top and bottom tips of the crack. Using the measured time of flight of the pulse, the depth of the crack tips can be calculated automatically by trigonometry application. This method is even more reliable than traditional radiographic, pulse echo manual UT and automated UT weld testing methods.
Applications
- Inspection of welds (Structural/Piping)
- PAUT in lieu of Radiography Testing (ASME Sec VIII, ASME B31.3, B31.1)
Personnel Qualification
- PCN Level II or PCN Level III
- CSWIP Level II or CSWIP Level III
- ASNT Level II or ASNT Level III
C – SCAN (Corrosion Mapping)
C-Scan refers to the image produced when the data collected from an ultrasonic inspection is plotted on a plan view of the component. The image of the results of an ultrasonic examination showing a crosssection of the test object parallel to the scanning surface. However, the C-scan does not have to be a single cross-section but often shows a combination of measurements obtained through the whole
thickness.
The C-scan is used in corrosion mapping and by techniques other than just ultrasonics. It is not limited to showing amplitude but is also used to display changes in measured wall thickness or qualitative measurements in the extent of corrosion.
Applications
- Thickness measurements
- Corrosion inspection
Personnel Qualification
- PCN Level II or PCN Level III
- CSWIP Level II or CSWIP Level III
- ASNT Level II or ASNT Level III
Magnetic Flux Leakage (MFL)
Tank Floor Scanning
Magnetic Flux Leakage (MFL) is a method of non-destructive testing that is used to detect corrosion and pitting in steel structures, most commonly pipelines and storage tanks, using powerful magnets to magnetize the steel. Recent developments in the methods available to inspect tank floors make remaining life predictions easier. The Floormap3Di is the most advanced MFL floor scanner on the
market today.
The degree of inspection and repair that it is economically sensible to perform before the whole floor is replaced will be influenced by many factors. These obviously include material and contracting costs, but a major factor will be the time and cost of cleaning the tank and preparing it for work. This latter cost will vary greatly depending on whether the tank is holding clean, light product or is handling crude or
heavy oil or a dirty liquid.
Long Range Ultrasonic Testing (LRUT)
The Guided Wave technology uses a low frequency guided ultrasound waves traveling along the pipe, providing 100% coverage of the pipe length. In normal application, tens of meters of piping may be inspected from a single location. Affected areas are precisely located in terms of distance from the transducer ring and highlighted for further local examination by visual or other conventional NDT methods. This non-destructive screening technique can be used without extensive scaffolding and minimizes the requirement of removing insulation along the piping.
Applications
- No need to remove insulations
- No need to excavate full length of pipes
- Corrosion, Pitting in Insulated Pipelines
- Corrosion, Pitting Buried Underground Pipeline
- Process Pipelines Corrosion Findings
Personnel Qualification
- PCN Level II or PCN Level III
- CSWIP Level II or CSWIP Level III
- ASNT Level II or ASNT Level III
Tube Inspection
Eddy Current Testing (ECT)
Eddy Current Testing is the notably the fastest and most preferred tube inspection technique available. Eddy Current however can only be used on non-ferrous materials like Brass, Copper, Copper-Nickel and Austenitic Stainless steel.
Local defects as well as overall wall-loss can be detected and quantified. ECT can detect both internal and external defects and can distinguish between them. Cracks can be detected depending on their size and orientation. By applying Multi frequencies, defects under support plates can be detected and to some extent quantified.
Internal Rotary Inspection System (IRIS)
Internal Rotary Inspection System is a technique that can be applied on both ferrous and non-ferrous materials and even on non-conductive materials like plastics.
With IRIS the remaining wall thickness of tubes can be accurately measured. IRIS is more accurate than other tube inspection techniques and has the advantage of presenting information about the geometry of defects. Local defects and wall-loss on both sides of the tube can be accurately measured. Defects under support plates can be measured without any limitations.
Remote Field Eddy Current Testing (RFET)
Remote Field Eddy Current Testing is a technique used for the inspection of tubes made of ferritic materials, like Carbon steel and Chrome-Molybdenum. RFT is only one of the techniques available for inspection of carbon steel tubes. Since al inspection techniques that are available for carbon steel have limitations compared to conventional eddy current, it is even more important to select the most suitable technique for each different situation. For the inspection of carbon steel tubes it is often recommended to use a combination of one or more techniques.
Local defects can be detected and quantified provided that they have some volume (diameter pit >5mm). RFT can detect both in- and external defects and can distinguish between them.
Magnetic Flux Leaking (MFL)
Magnetic Flux Leakage is a technique used for the inspection of tubes made of ferritic materials. This technique will normally be applied as a fast screening technique if small diameter pitting is expected. Because of limitations to its sizing abilities the technique is not often used as a stand-alone technique. Verification by other techniques is recommended. MFL can also be used on airfin cooler tubes.
MFL is sensitive to sharp type defects like pits and grooving. In- and external pits can be detected. Depending on probe configuration MFL can distinguish between in- and external defects and can detect gradual wall-loss. For ID/OD discrimination the probe needs to be equipped with a second coil and to detect gradual defects a Hall-effect sensor in the probe is needed.
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