Inspectioneering

Liquid Penetrant Examination (LPE)

Liquid Penetrant Examination (LPE), also referred to as penetrant testing (PT), liquid penetrant testing (LP), and dye penetrant testing (DP), is a nondestructive examination (NDE) method that utilizes fluorescent dye to reveal surface flaws on parts and equipment which might not otherwise be visible. The technique works via the principle of “capillary action,” a process where a liquid flows into a narrow space without help from gravity. Because it is one of the easiest and least expensive NDE techniques to perform, LPE is one of the most commonly used inspection techniques in many industries, including oil and gas. 

While this method is effective due to its simplicity and accuracy, it does have its share of disadvantages as well. It can only detect flaws on the surface. So for subsurface flaws, a technique like magnetic particle testing (MPT) is more appropriate. It also only works on smooth surfaces, which can make it unsuitable for some parts.

 

Related Topics

Acoustic Emission Testing (AET) Advanced Ultrasonic Backscatter Technique (AUBT) Eddy Current Array (ECA) Electro Magnetic Acoustic Transducers (EMAT) Guided Wave Ultrasonics (GWUT) Infrared Thermography (IT) Infrared Thermometry Magnetic Flux Leakage (MFL) Magnetic Particle Testing (MPT) Meandering Winding Magnetometer Array (MWMA) Pulse Reflectometry Pulsed Eddy Current (PEC) Radiography Thermography Ultrasonic Testing (UT)

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    Detecting, quantifying, and sizing indications characterized as a “crack” in critical equipment have long been the global benchmark of asset integrity programs. Therefore, the increased precision that inspection programs obtain using advanced technologies can dynamically improve the overall assessment.

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    June 1, 2015 By Nick Schmoyer at Inspectioneering

    Nondestructive Testing (NDT) makes up the majority of testing performed in our industry. There many different types of nondestructive testing techniques. Each method has its own advantages and disadvantages; each can detect different types of flaws. Some are simple to perform, others are difficult. Some are used on several different types of equipment, others are more restricted.

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