SGS uses non-destructive testing method
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SGS SA - Industrial Services product story
Edited by the Engineeringtalk editorial team
Mar 17, 2009
SGS Industrial Services utilises dye penetrant examination (PT) to detect clad layers, welds and heat-affected zones.
PT, also known as liquefied penetrant examination, is a non-destructive testing method.
It involves applying a liquid to the surface of a material and leaving it to rest for a pre-determined period of time.
The liquid - the so-called penetrant - can be either a colour that is visible under normal lighting conditions or a yellow/green fluorescent colour that requires special lighting conditions to be effective.
The penetrant is applied to the material surface and it penetrates the defects.
After some time, the penetrant fluid is washed off the surface.
With a developer applied to the now-clean surface, the defects where the fluid has penetrated are made visible.
These spots are called indications.
Acceptance criteria defines whether or not the indication is a defect or not.
PT is intended to decrease the risk of leakage or other defects.
According to the company, when dealing with exploitation licences and preventive maintenance of technical installations, non-destructive testing and examination techniques are indispensable.
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