Dye Penetrant (PT) Procedure • By: Associate Professor Stephen Collins • Last revised: March 13, 2005 • For informational PT only. • This is not an authorized procedure for inspection to any code or specification.
Safety • You must have documented MSDS training on PT materials before using them. • Wear safety glasses and gloves (illustrations here do not show gloves, but you must wear them when handling PT materials)
1. Degrease the surface to be inspected. • Skip this step if no grease or oil is present. • Coat the area to be inspected with Cleaner • Let grease dissolve, wipe dry with clean cloth • Allow Cleaner to evaporate 2 1
2. Clean the surface by sanding or wire brushing. • Skip this step if surface is clean and smooth. • Grinding leaves deep scratches, making it difficult to clean. Follow up with sanding.
3. Apply the penetrant • holding the spray can back about 12” from the surface using a sweeping motion. • Use only enough penetrant to cover the inspection area.
4. Let stand for 10 minutes • to allow penetrant to enter flaws open to the surface.
5.Wipe the surface • with a clean dry rag to remove penetrant
6. Clean the surface • using a rag premoistened with cleaner/solvent. • Do not flush the surface with cleaner/solvent • Repeat until all traces of penetrant are removed, rag comes up clean.
7. Let stand for 10 minutes • to allow cleaner to evaporate
8. Apply the developer • Shake the can vigorously, make it rattle • holding can back about 12” from surface, using a sweeping motion. • Several light coats will dry more quickly. Do not allow to sag or puddle.
9. Let stand for 10 minutes • observing indications as they develop to aid in identification. • Interpret and evaluate any flaws by comparison to a suitable standard.
Examples of PT • Excavations of defects in castings
References • Magnaflux Corporation (2005) Spotcheck Dye Penetrant Operating Instructions. Retrieved March 13, 2005 from http://www.magnaflux.com/files/library/operating/Spotcheck~reg_Kit_Operating_Instructions.pdf • NDT Resource Center (n.a.) Introduction to Dye Penetrant Testing. Retrieved March 13, 2005 from http://www.ndt-ed.org/EducationResources/CommunityCollege/PenetrantTest/Introduction/history.htm
Links • http://technology.open.ac.uk/materials/mem/mem-dye.html The Open University, Faculty of Technology Dye Penetrant Testing. • http://www.nde.lanl.gov/default.htm Los Alamos National Laboratory, Engineering Sciences & Applications (ESA) Division • http://www.ndt.net/index.html NDT Net, the e-Journal of Nondestructive testing