Which type of penetrant is a fluorescent penetrant?
Fluorescent penetrant inspection (FPI) is a type of dye penetrant inspection in which a fluorescent dye is applied to the surface of a non-porous material in order to detect defects that may compromise the integrity or quality of the part in question.
What is fluorescent dye penetrant?
Fluorescent Penetrant Inspection (FPI) is a Non Destructive Testing (NDT) technique where a fluorescent dye is applied to the surface of an impermeable material to clearly identify surface defects.
What is a disadvantage of using the fluorescent penetrant process?
Disadvantages of LPI Extensive, time-taking pre-cleaning critical—surface contaminants can mask defects. Sensitive to surface-breaking defects only. Direct connection to the surface under test necessary.
How do you do a fluorescent penetrant inspection?
The process involves applying a penetrant chemical, visible or fluorescent, directly to the part that’s to be inspected. The excess penetrant is removed and a developer is applied to draw the penetrant deep from the cracks to the surface of the part.
How do you make fluorescent dye?
Combine 166 mg of phthalic anhydride, 220mg of resorcinol and 3 drops of concentrated sulfuric acid. Heat to 200 degrees celsius for 5 minutes. The crude fluorescein produced is dissolved in dilute sodium hydroxide solution (300mg in 10mL of water).
Which type of penetrant process is least susceptible to over washing?
Fluorescent penetrant is inherently more sensitive than colour contrast. Post-emulsifiable is more sensitive than water washable since there is less danger of over-washing of the penetrant. Non-aqueous developer is the most sensitive.
What are fluorescent dyes used for?
Fluorescent dyes, or fluorophores, enable researchers to visualize specific biological molecules by fluorescence microscopy. Typically they are conjugated to target molecules, such as antibodies, for use in techniques such as immunohistochemistry and flow cytometry.
Which of the following is not an advantage of a water washable fluorescent penetrant process?
| Q. | Which of the following is not (!) an advantage of a water washable fluorescentpenetrant process? |
|---|---|
| C. | It is readily removed from shallow discontinuities |
| D. | It has low cost, low processing time compared to the post emulsified penetrant process |
| Answer» c. It is readily removed from shallow discontinuities |