Liquid penetrant inspection (LPI), or dye penetrant inspection, is a reliable, efficient, and cost-effective method for detecting surface flaws of welds, castings, and other components that cannot be destroyed. LPI is a portable surface inspection method, allowing our Engaged Experts to conduct comprehensive onsite penetrant inspection.
Liquid penetrant inspection is a valuable tool for evaluating non-ferromagnetic and non-metallic materials. In addition to checking for defects and cracks, it can also be used to determine other surface characteristics, such as porosity.
The penetrant inspection process
Parts must go through a pre-cleaning process (etch, alkaline or solvent-cleaning) before the liquid penetrant is applied. After allowing proper dwell time, excess penetrant is removed from the surface (but not from any possible defects), and the part is dried. Then a developing powder is applied; this developer pulls up the dye that has seeped into cracks or pores, resulting in visible marks or indications that identify surface flaws. Based on the results, an inspector then provides a report with the type, number and size of defects on a component.
Element’s LPI qualifications
Our non-destructive testing (NDT) experts are well-trained in liquid penetrant inspection and hold Level II and III certifications from ASNT, among other qualifications. Element provides Type II non-fluorescent NDT services to all of the various commercial and nuclear codes, as well as Type I fluorescent inspection to aerospace, government, nuclear, and after-market applications.
For more information about our liquid penetrant inspection services or to request a quote, contact us today.
Our LPI capabilities
- A 55’ x 15’ wet room equipped with a 2.5-ton hoist for processing large specimens
- All methods of dye penetrant inspection, including lipophilic and hydrophilic emulsified systems, as well as water washable and solvent removable to meet any sensitivity requirements
- Certification by major prime contractors for the inspection of fracture critical hardware
- In-house chemical etching services, which allows for "one-stop lab" processing
Standards we test to
American Metals SocietyAMS 2645, AMS 2646, AMS 2647
American National Standards InstituteANSI/ASME B31.1, ANSI/ASME B31.3
American Petroleum InstituteAPI 1104
American Society of Mechanical EngineersASME Section III, ASME Section V, ASME Section VIII
American Society for MetalsASM 2700
American Society of Non-Destructive TestingNDT 8
American Society for Testing and MaterialsASTM E165, ASTM E1417, ASTM E1418
American Welding SocietyAWS D1.1
Deutsches Institut Fur Normung E.V.DIN EN 571-1, DIN EN ISO 3452-5, DIN EN ISO 3452-6, DIN EN 10228-2, DIN EN ISO 3452-2, DIN EN 1371-1, DIN EN 1371-2
Military StandardMIL STD 271F, MIL STD 6866, NAVSEA T9074-AS-GIB-010/271, MIL-STD-2132, MIL-I-6866, MIL-STD-1907
National Aerospace StandardNAS410
Society of Automotive EngineersSAE J426
Various Customer SpecificationsIncluding Aerojet Rocketdyne, Boeing, Bombardier, Cessna, GE, Hamilton Sunstrand, Honeywell, Northrop Grumman, and Rolls Royce.
providing certainty for nearly 190 years
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