ASNT NDT Level III PT flashcards
ASNT NDT Level III PT · Build recall with a focused review session.
32 cards. Read the term and the definition here. The deck at the top of this page is optional.
- Capillary action
- The tendency of a liquid to be drawn into narrow spaces by surface tension and adhesive forces, which is the physical mechanism by which penetrant enters surface-breaking discontinuities.
- Bleedout
- The reverse capillary flow by which entrapped penetrant exits a discontinuity and appears at the surface, forming the indication that is interpreted during inspection.
- Fluorescent penetrant
- A Type I penetrant containing a fluorescent dye that fluoresces under ultraviolet-A light, providing high contrast for detecting small discontinuities in a darkened area.
- Visible penetrant
- A Type II color-contrast penetrant, typically red, that produces indications evaluated under white light of at least 100 foot-candles at the inspection surface.
- Sensitivity level
- A classification of penetrant systems from low to ultrahigh (levels 1/2 through 4) assigned per AMS 2644, indicating the ability to detect small discontinuities.
- Post-emulsification method
- A penetrant removal method in which an emulsifier is applied after penetrant dwell to make the excess penetrant water-removable, requiring tightly controlled emulsifier contact time.
- Hydrophilic emulsifier
- A water-based emulsifier concentrate applied by immersion or spray, typically maintained at 5 to 20 percent concentration and monitored with a refractometer.
- Lipophilic emulsifier
- An oil-based emulsifier used with post-emulsifiable penetrants, applied after penetrant dwell and controlled by contact time to avoid over-removal of penetrant.
- Dry powder developer
- A nonaqueous developer applied after the part is dried, providing a blotting action that draws penetrant from discontinuities to form visible indications.
- UV-A intensity requirement
- Fluorescent penetrant inspection requires ultraviolet-A illumination of at least 1000 microwatts per square centimeter at the inspection surface in a darkened area.
- White light requirement
- Visible penetrant inspection requires white light of at least 100 foot-candles (about 1000 lux) at the inspection surface for adequate indication contrast.
- Penetrant dwell time
- The period the penetrant remains on the part, commonly 5 to 30 minutes, counted from completion of application and specified by the procedure or specification.
- Development time
- The period allowed after developer application for penetrant to bleed out and form indications, typically 10 to 30 minutes before interpretation.
- AMS 2644
- The specification governing qualification of penetrant materials, establishing families, types, methods, and sensitivity levels for penetrant systems.
- ASTM E1417
- The standard practice for liquid penetrant testing that describes procedures, materials, and techniques for conducting penetrant examinations.
- Surface temperature limit
- Penetrant testing generally requires surface temperatures within about 10 to 52 degrees Celsius (50 to 125 degrees Fahrenheit) unless the procedure is qualified otherwise.
- Rinse water temperature
- Water used to rinse penetrant should be maintained within a specified range, commonly 10 to 38 degrees Celsius, to avoid over-removal or chilling of the part.
- Relevant indication
- An indication that results from a discontinuity and must be evaluated against the acceptance criteria of the applicable code or specification.
- Nonrelevant indication
- An indication arising from part geometry, machining marks, or penetrant trapped in threads or keyways rather than from a true discontinuity.
- False indication
- An indication caused by improper technique, such as penetrant trapped under a lap or incomplete cleaning, rather than by a real discontinuity.
- Linear indication
- An indication whose length is greater than three times its width, typically evaluated against stricter acceptance criteria than rounded indications.
- Rounded indication
- An indication whose length is less than or equal to three times its width, evaluated according to the applicable code's rounded-indication criteria.
- Interpretation versus evaluation
- Interpretation distinguishes relevant from nonrelevant indications, while evaluation compares relevant indications against the acceptance criteria to determine disposition.
- SNT-TC-1A
- A recommended practice published by ASNT that provides guidelines for qualifying and certifying NDT personnel, implemented through the employer's written practice.
- CP-189
- An ANSI/ASNT standard that mandates minimum training, experience, and examination requirements for NDT personnel certification.
- Written practice
- The employer's controlling document that defines certification requirements, training hours, experience, and examination methods for NDT personnel.
- Level III responsibilities
- Duties include procedure development and approval, technique qualification, personnel training and examination, and auditing of the NDT program.
- Near-vision requirement
- Certified NDT personnel must demonstrate near-vision acuity of Jaeger 1 at 12 inches (30 cm) and color perception sufficient for the method used.
- Magnetic particle testing
- An NDT method that detects surface and near-surface discontinuities in ferromagnetic materials by magnetic flux leakage, complementing penetrant testing.
- Ultrasonic testing
- An NDT method using high-frequency sound waves to detect internal discontinuities and measure material thickness, unlike surface-only penetrant testing.
- Radiographic testing
- An NDT method that reveals internal density differences using penetrating radiation, capable of detecting internal flaws that penetrant testing cannot find.
- ASME Section V
- The section of the ASME Boiler and Pressure Vessel Code that defines examination methods, while Section VIII defines acceptance criteria for pressure vessels.