Visible (Type II)

Guide to choosing a Visible penetrant

Trikon offers a complete line of visible (Type II) dye penetrant inspection materials. Materials have been qualified to AMS-2644D. They meet the requirements of ASME Boiler and Pressure Vessel Code, ASTM E-165, and ASTM E-1417 for penetrant inspection. They are certified to NAVSEA 250-1500-1. Visible inspection penetrants are used primarily for field applications where darkening the inspection area and the use of a black light (UVA) is impractical, such as maintenance weld repair and safety checks.

They are used to locate repair work areas on large rough castings and for through leak testing of heat exchangers and tanks where penetrant is applied to one side and developer to the other. Discontinuities in the range of 50µ are routinely detectable and under the right conditions and processing 30µ discontinuities can be highlighted. Special high temperature visible penetrant materials are available which permit inspection of surfaces at temperatures up to 177°C (350°F).

Water Washable Visible (Type II)

Visible inspection penetrants are used primarily for field applications where darkening the inspection area and the use of a black light (UV-A) is impractical, such as maintenance weld repair and safety checks. They are used to locate repair work areas on large rough castings and for through leak testing of heat exchangers and tanks where penetrant is applied to one side and developer to the other. Discontinuities in the range of 50μ are routinely detectable and under the right conditions even smaller discontinuities may be highlighted. Special high temperature visible penetrant materials are available which permit inspection of surfaces at temperatures up to 177deg. C (350deg. F). The majority of the applications use the solvent wipe off (Method C) technique of processing because most applications are spot or localized inspections. Production or full part inspection may be performed with visible penetrants using Methods A, B or D.

Cleaners & Removers

Evaporation rate should be considered when choosing a cleaner/remover. When wiping the penetrant residue from a rough surface the slower evaporating remover will keep the wiping media moist and more effective at helping the removal of the penetrant. In the case of verifying a fluorescent indication by wiping

the indication with a cotton swab or brush moistened with the remover, the slow evaporating material

will make the indications blurry and bleed excessively. In this case a very fast drying cleaner is the right

choice. When used as cleaners for pre-cleaning the inspection surface, the slow material will not evaporate

readily from the part and could interfere with penetration of the discontinuity by the penetrant.

The faster drying cleaners are also better solvents for oils and greases improving their removal from the part.

Tam Panel or star burst indication cleaning is best achieved with the directional spray tube applicators used on R-503 and R-504. Both are approved by Pratt & Whitney.

The first step is to determine the proper approach to the penetrant inspection task. Each application will depend on the kind of part to be tested, together with its characteristic defects. The types and quantities of stations can then be selected.

Station size is determined by piece part, size, weight, shape, and other characteristics. Arrangement of the stations will depend on the space availability and configuration of the production line. For some applications, optional features or customized construction may be required.

If you are considering a liquid penetrant inspection system, Trikon will work with you to determine the proper system to meet your requirements. With your design approval, we can fabricate the system, prove it out, and instruct your personnel in its proper use. Call Today to see how Trikon can help you design a system that’s right for your application as well as your budget.

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