The testing methods detect cracks, fractures, laps, seams and other flaws that are open to the surface that may have been caused by fatigue, impact, quenching, machining, grinding, forging or overload. More options have developed in the way liquid a variety of penetrant materials are available and selection is often based on the required sensitivity penetrant. V22a, 6th main, 2nd stage, peenya industrial estate, bangalore560058, india. Liquid penetrant inspection lpi, also known as dye penetrant inspection dpi or penetrant testing pt, was first developed in the early 1940s to detect flaws on the surface of materials. Liquid dye penetrant test inspection free ndt sample. This method was used extensively in the railroad industry and was termed the oil and whiting test. Although there are more options in the way the test is performed, the basic principles have not changed over the years. The technique is based on the ability of a liquid to be drawn into a clean surface discontinuity by capillary action. The technique is based on the ability of a liquid to be. Liquid penetrant processes are nondestructive testing methods for detecting discontinuities that are open to surface. The liquid penetrant testing lpt technique is usually used for the. The test specimen shall then be wiped clean and excess penetrant removed. An ndt method that is used to reveal surface breaking flaws through bleed out of a colored or fluorescent dye from the flaw.
Materials not conforming to the requirements of ams 2644 may be used only when a waiver is obtained from the cognizant engineering organization. Note solvent shall not be sprayed onto the test specimen. Ndt is one of the finest and accurate quality tool used in reducing the costs of testing. This is a sample lpt procedure and may be required to be modified as per specific requirements. Liquid penetrant testing is one of the oldest and simplest ndt methods where its earliest versions using kerosene and oil mixture dates back to the 19 t h century.
They may be effectively used in the inspection of both ferrous and nonferrous metals and on nonporous, nonmetallic materials, such as ceramics, plastics and glass. Among the various methods of nondestructive testing, liquid penetrant is mainly applicable to metallic materials and detects discontinuities of size greater than. Objective liquid penetrant processes are nondestructive testing methods for detecting discontinuities that are open to surface. Ndt procedure for liquid penetrant inspection a nondestructive testing ndt procedure suitable for general liquid dye penetrant inspections. Pdf nondestructive testing by liquid penetrant testing and. Liquid penetrant and magnetic particle testing at level 2. Liquid penetrant inspection report an ndt inspection test report, useful for documenting observations of liquid dye penetrant examinations format no. Qmsp008 revision 0 august 08, 2016 page 7 9 cleanerremover and then applied to the test specimen.