NDE Boiler Inspection
Ultrasonic Thickness Testing
Testing is used to determine remaining wall thickness of piping, tubing, steam drum, mud drum, and any area where wall thinning could be prevalent. Ultrasonic testing may also used to inspect areas that may suffer damage due to a failure in that vicinity.
Ultrasonic Shear Wave Testing
Test utilizes angle beam technology comparing welds and parent material to find indications in the weld material such as cracks, incomplete fusion, and incomplete penetration. This type of evaluation uncovers the extent of indications (length, height, width) in a parent material to avoid forced outages. Another advantage of ultrasonic shear wave testing is that unlike radiographic testing, the area doesn’t need to be restricted due to use of radioactive material.
Ultrasonic Linear Phased Array Testing
Phased Array Inspection offers advanced angle beam testing inspection having all the advantages listed above for shear wave testing plus the increase of the speed of inspection along with supplying a visual record of scans and defects comparable to radiographic film. It has the ability in an one line scan to receive data on all angles from 45 deg through 70 deg. The amount of useful data collected using Phased Array Inspection when compared to standard shear wave is as little as 10x and up to 64x more depending on the transducer used. Conventional shear wave provides an inspector an A-scan screen to interpret data from but with phased array inspection, the inspector has A-scan, B-scan, C-scan, and S-scan screens to interpret data. Also with the additional screens the sizing or depth from surface, length, height of defect/indication is within +/- 1.5mm.
Inspection techniques used to produce plastic replica tape after mechanical and chemical surface preparations are performed. The replica tape is reviewed on the jobsite by a qualified replication specialist for acceptance and microscopic field review. The replica is sent to our metallurgical lab for final review, analysis and documentation.
Magnetic Particle Testing
Inspection technique that is used on ferrous material to find any indications open to the surface or within 1/32” of the surface. AC wet fluorescent magnetic particle testing is mainly used due the sensitivity of the method.
|Dye Penetrant Testing
Inspection techniques that may be used on any non-porous material to find indications open to the surface. Penetrant is applicapable to all non-ferrous materials and ferrous materials. The testing may be performed in color contrast or fluorescent. Casting, forging, hairline cracks in the weld surface, leaks, surface porisity, as well as fatigue cracks on in-service components may be detected utilizing this testing.
Ultrasonic Oxide Thickness Testing
Ultra oxide thickness testing is performed to assess the thickness of oxide buildup on the ID of tubes and piping that will result in a reduced heating transfer to the fluid inside the tubes.
Figure 1 - Tube with 0.099"RWT and no oxide thickness
Figure 2 - Tube with 0.110" RWT and 0.042" oxide.
NDE Methods Applicable for Various Components of Fossil Fuel Power Stations
|Deaerator & Storage Tank||X||X||X||X||X||X||X||X||X|
|Piping (High Energy)||X||X||X||X||X||X||X||X||X|