Presentation on Dye Penetrant Testing

This presentation Based on Non Destructive Testing.the Abbreviation is NDT.Dye penetrant Testing (DPT) is the part of NDT .I think my presentation will be helpful for NDT Related person

1. Presentation of Dye Penetrant Testing(DPT) Presented by Md. Arman Hossain SAJ Industrial & Inspection Company

2. Introduction of DPT Dye penetrant inspection ( DPI ), also called liquid penetrate inspection ( LPI ) or penetrant testing ( PT ), is a widely applied and low-cost inspection method for all non-porous materials (metals, plastics, or ceramics )

3. What is DPT Liquid penetrant testing is a method that is used to reveal surface breaking flaws by bleed-out of a colored or fluorescent dye from the flaw.

4. History of DPT The oil and whiting method used in the railroad industry in the early 1900s was the first recognized use of the principles of penetrants to detect cracks. The oil and whiting method used an oil solvent for cleaning followed by the application of a whiting or chalk coating, which absorbed oil from the cracks revealing their locations. Soon a dye was added to the liquid. By the 1940s, fluorescent or visible dye was added to the oil used to penetrate test objects

5. Advantage of DPT Sensitive to small surface discontinuities Can inspect metal and non-metal Works on complex geometric shapes Visual, real-world results portable Liquid penetrant testing materials are individually very affordable Its relatively easy to use

6. Disadvantage or Lamination of DPT Only sensitive to surface-breaking defects Surface must be clean properly Can not inspect porous meter metal generally No depth sizing User dependent Some rubber and plastics may be affected by penetrant material

7. Porous metal Porous metal is a metal which has large volume of pore or voids.

8. Application metal of DPT

9. Usage material in DPT Cleaner Penetrant Developer Black light for fluorescent method Cleaner : is a remover .it is use to clean the test surface or remove the surface from oil,dust,rust and other contaminant.

10. Penetrant penetrant means which have penetrate ability .dye penetrant penetrate into discontinuity of specimen by capillary action . which produces contrasting indications against the white developer background Capillary action   is the ability of a liquid to flow in narrow spaces without the assistance.it occur cause of adhesion and cohesion.

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12. Classification of penetrant Penetrant are three types – 1.Visible dye penetrant 2.Fluorescent dye penetrant 3.Duel sensitivity penetrant Each types of penetrant is again classified into tree groups according to their removal process. 1.Sovlent removal penetrant 2.Water washable penetrant 3.Post emulsifiable penetrant

13. Visible penetrant This types of penetrant visible in normal light and containing visible colour . normally red colour .

14. Fluorescent penetrant Fluorescent penetrant : this types of penetrant is colourless and not visible in normal light. require ultraviolet or black light to visible the penetrant.

15. Duel sensitivity penetrant: this types of penetrant combines of visible penetrant and fluorescent penetrant . indication can be visible under normal light also black light.

16. Water washable penetrant Water washable penetrant is Remove by water . It is in-built in emulsifier and easily washable in water. Suitable for rough surface or thread .Poor reliability for wide and shallow d iscontinuity

17. Solvent removable penetrant This type of penetrant is remove by solvent. Main advantage of this type of penetrant is portability and excellent for checking a large part remote area

18. Post Emulsifiable penetrant Emulsifier apply on this type of penetrant .emulsifier react with penetrant and make it water washable . then apply water to remove penetrant.

19. Emulsifier Emulsifier is a one type of detergent agent . which react with penetrant and make penetrant water washable. There are two types of emulsifier , that are- 1.lipophilic-oil based detergent 2.hydrophilic-water based detergent

20. Developer Developer is highly absorbent, the penetrant is drawn out from the discontinuity by it blotting action . The developer are basically are two types Dry developer Wet developer-wet developer are two types aqueous developer- Water suspension type Water soluble type Non-aqueous developer

21. Dry developer Dry developers are white, fluffy high absorbent powders that can be applied to a thoroughly dry surface. It’s usually used on fluorescent penetrant.

22. Aqueous wet developer this types of developer is water based developer . Water suspension :a suspension of absorptive white powder suspend in water , water soluble : a water –soluble absorptive white powder in water . the water suspension type developer requires agitation during use . the water soluble developer need not require agitation . Water soluble type water suspension type

23. Non-aqueous developer Non-aqueous developer is a suspension of absorptive white powder in solvent . prior to application requires agitation.

24. black light black light is the ultraviolet light . which supply the light of wavelength 365 nm . the ultraviolet light wavelength is below the visible light wavelength. The intensity of black light should be minimum 1000mw/cm2

25. Classification of DPT Depend on portability Portable dye penetrant testing Stationary dye penetrant testing Portable DPT Stationary DPT

26. Dye penetrant testing naturally are classified according to the penetrant medium . Depend on the penetrant medium dye penetrant testing are Visible dye penetrant testing Fluorescent dye penetrant testing Dual sensitivity dye penetrant testing Each system classified into 3 method according to remove process- Water washable dye penetrant testing Solvent removable dye penetrant testing Post emulsifiable dye penetrant testing

27. Principle of DPT penetrant to be drawn into a "clean" surface breaking flaw by capillary action . After dwell time excess surface penetrant is removed and developer applied. It draw out the penetrant from the flaw by blotter action.

28. During DPT inspection ,we have to follow some step .this step are- Pre –cleaning of the test part Application of penetrant and wait for dwell time Removal of excess penetrant from test surface Apply developer Inspection and evaluation of indication Post clean

29. Pre-clean Apply penetrant remove Apply developer Post clean Fig : Flow chart for Visible and Fluorescent Dye Penetrant Testing alkaline steam Apply water washable penetrant Solvent wash Vapor degrease Paint stripper Mechanical wash detergent Ultrasonic wash Water wash Water wash Solvent wipe-off dry Apply remover Apply emulsifier Dry Apply solvent removable penetrant Apply post emulsifiable penetrant Aqueous developer Developer(dry or non-aqueous Dry Developer(dry or non-aqueous) inspect Detergent Water rinse Dry Mechanical wash Dry Vapour degrease Solvent soak Ultrasonic clean Dry

30. step water washable dye solvent removable dye post emulsifiable dye penetrant system penetrant system penetrant system pre clean apply solvent or others apply solvent or others apply solvent or others Apply penetrant and apply water washable dye apply solvent removable dye apply post emulsifiable dye wait for dwell time. Penetrant P enetrant Penetrant apply emulsifier or remover Remove excess apply water apply solvent remover apply water Penetrant Dry aqueous Dry aqueous Developer Developer Apply Developer Dry or non- Dry apply dry or non-aqueous developer Dry or non- Dry aqueous dev. aqueous dev. Inspection inspection Inspection inspection Post cleaning apply solvent remover or other Apply solvent remover or other apply solvent remover or other

31. Indication in DPT Penetrant indication are classified into three group 1.True indication- true indication presence cause of true discontinuity of the part. 2.Irrelevant indication- this type of indication is not form due to true discontinuity of the part 3.False indication- it also not form due to true discontinuity.

32. True indication Linear indication Round indication

33. Irrelevant indication cv Arc strike Mechanical damage spatter

34. Sometimes it is necessary to record the indication for use in the report and inspection record for future reference, this recording can be accomplished by any other following - Photography - Recording or indication

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36. Thanks to everybody