Liquid Penetrant Testing (LPT) Test 11 Quiz
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Question.
Why is it possible to flush a surface with a coarse water spray to which a water washable penetrant was applied, remove the excessive penetrant, and not remove the penetrant that is in the defects?
The liquid will not wash the penetrant form the defects because the penetrant has to be drawn out by the developer.
The nature of a water washable penetrant is such that water will not dissolve the penetrant , it has to push the penetrant off the surface, which is why a spray is used.
The water droplets are relatively large and will not enter droplets are defect openings.
A water spray should not be used, the penetrant should be removed by a cloth dampened with water.
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