PT

LIQUID PENETRANT TESTING(LPT)

Dye penetrant inspection (DPI), also called liquid penetrant inspection (LPI) or penetrant testing (PT), is a widely applied and low-cost inspection method used to locate surface-breaking defects in all non-porous materials (metals, plastics, or ceramics). The penetrant may be applied to all non-ferrous materials and ferrous materials, although for ferrous components magnetic-particle inspection is often used instead for its subsurface detection capability. LPI is used to detect casting, forging and welding surface defects such as hairline cracks, surface porosity, leaks in new products, and fatigue cracks on in-service components.

In practice, the liquid penetrant inspection process is relatively simple. Equipment generally is simpler and less costly than that for most other NDT methods .When used on ferromagnetic steels, in some instances, the sensitivity of liquid penetrant test is better than that of magnetic particle testing.

Application

The method is used to inspect a variety of product forms including castings, forgings, and weldments. Many different industries use magnetic particle inspection for determining a component’s fitness-for-use.
Some examples of industries that use magnetic particle inspection are the structural steel, automotive, petrochemical, power generation, and aerospace industries. Underwater inspection is another area where magnetic particle inspection may be used to test items such as offshore structures and underwater pipelines.

Steps need to Liquid Pentrant Testing

1. Surface preparation.
2. Application of penetrant.
3. Removed of Excess penetrant.
4. Application of Developer.
5. Observation and Reporting.

Limitations

1. Porous materials, such as ceramics cannot be inspected.
2. Subsurface discontinuity detection is not possible.
3. Neeed proper surface cleaning to get accurate results.

Liquid penetrant inspection facilities at Asquare, Jubail, KSA.

1. Liquid penetrant inspection equipment like mentioned below:
   • Magnaflux chemicals
   • FLUROSCENT LPI facilities avaliable
2. Experienced PT inspector for carry out difficult configuration of welds.
3. Experienced in house ASNT NDT Level III and experts for providing techniques establishment, procedure preparation, approval and consultancy services.
4. ASNT NDT Level III trainers for conducting in house or external NDT Level 2 training and certification courses on Ultrasonic testing and other NDT inspection methods. Read more about Ultrasonic Testing Personnel Certifications.
5. PT inspectors qualified and certified to Level II as per ASNT recommended practice SNT-TC-1A is approved & also BINDT (British institute of nondestructive testing) approved Level-II according to ISO 9712:2012 for carry out inspection.