Labsheet (Liquid Penetrant Test)

MECHANICAL ENGINEERING DEPARTMENT
DJJ30113 – MATERIAL SCIENCE & ENGINEERING

(LABORATORY)
SESSION 1 2021/2022
___________________________________________________________________________________________
Tittle: LIQUID PENETRANT TEST
Duration: 2 Hours
COURSE LEARNING OUTCOMES (CLO):
Upon completion of this course, students should be able to:
CLO1 : Apply the fundamental of material science to identify the materials properties, behaviour processes and
treatment. (C3,PLO1)
CLO2 : Performed appropriate material testing according to the Standard Operating Procedures. (P4 , PLO5)
CLO3 : Demonstrate the ability to work individually and in groups to complete assigned tasks during the practical
work session. (A3 ,PLO9)
1.0 Objectives
1.1 To perform liquid penetrant test on metal surface.

1.2 To evaluate flaws occurred on inspection surface.
2.0 Apparatus / Equipment / Specimen:
2.1 Dye penetrant kit consists of cleaner, penetrant and developer.
2.2 Inspected specimen/welding metal.
3.0 Theory
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 19th century. This method is used to reveal
surface discontinuities by bleed out of a colored or fluorescent dye from the flaw. The technique is
based on the ability of a liquid to be drawn into a "clean" surface discontinuity by capillary action.
After a period of time called the "dwell time", excess surface penetrant is removed and a
developer applied. This acts as a blotter that draws the penetrant from the discontinuity to reveal
its presence.
The advantage that a liquid penetrant inspection offers over an unaided visual inspection is that
it makes defects easier to see for the inspector. It improves the detectability of a flaw due to the
high level of contrast between the indication and the background which helps to make the
indication more easily seen (such as a red indication on a white background for visible penetrant
or a penetrant that glows under ultraviolet light for fluorescent penetrant).
Liquid penetrant testing is one of the most widely used NDT methods. Its popularity can be
attributed to two main factors: its relative ease of use and its flexibility. It can be used to inspect
almost any material provided that its surface is not extremely rough or porous. Materials that are
commonly inspected using this method include; metals, glass, many ceramic materials, rubber
and plastics. However, liquid penetrant testing can only be used to inspect for flaws that break
the surface of the sample (such as surface cracks, porosity, laps, seams, lack of fusion, etc.).
4.0 Procedures
The general steps can be summarized as follows:
1. Surface Preparation: Wipe the test surface clean from oil, grease, water, or other
contaminants that may prevent penetrant from entering flaws.
2. Penetrant Application: Once the surface has been thoroughly cleaned and dried, the
penetrant material is applied by spraying onto surface.
3. Penetrant Dwell: The penetrant is left on the surface for a sufficient time to allow as
much penetrant as possible to be drawn from or to seep into defect.
4. Excess Penetrant Removal: Remove excess penetrant from the surface of the sample
while removing as little penetrant as possible from defects.
5. Developer Application: Apply a thin layer of developer to draw penetrant trapped in flaws back
to the surface where it will be visible.
6. Indication Development: The developer is allowed to stand on the part surface for a period of
time sufficient to permit the extraction of the trapped penetrant out of any surface flaws. This
development time is usually a minimum of 10 minutes. Significantly longer times may be
necessary for tight cracks.
7. Inspection: Perform visual inspection under appropriate lighting to detect indications from
any flaws which may be present.
8. Clean Surface: The final step in the process is to thoroughly clean the part surface to remove
the developer from the parts that were found to be acceptable.
5.0 Results / Data
Attach a photo of your inspection metal.
6.0 Calculation/Analysis data and result
Doing observation and evaluate what type of flaws occurred on the inspection surface. Circle and
label the defects on the photo.
7.0 Discussion
Discuss the activity and observations being made.
8.0 Conclusion
Conclude your experiment based on objectives, results and discussion.
9.0 REFERENCE
Write the reference using APA format
Prepared by Checked and Verified by:

Item Assessment Checklist YES NO
Consistent with: √
 AST
 CIST √
 Bloom's Taxonomy Domain √
(_______________________)
(__________________________)
Lecturer/ Course Coordinator
Head of Programme

Labsheet (Liquid Penetrant Test)

Uploaded by

Copyright:

Available Formats

Labsheet (Liquid Penetrant Test)

Uploaded by

Document Information

Original Description:

Original Title

Copyright

Available Formats

Share this document

Share or Embed Document

Sharing Options

Did you find this document useful?

Is this content inappropriate?

Copyright:

Available Formats

Labsheet (Liquid Penetrant Test)

Uploaded by

Copyright:

Available Formats

MECHANICAL ENGINEERING DEPARTMENT

DJJ30113 – MATERIAL SCIENCE & ENGINEERING

COURSE LEARNING OUTCOMES (CLO):

Upon completion of this course, students should be able to:

1.1 To perform liquid penetrant test on metal surface.

2.0 Apparatus / Equipment / Specimen:

2.1 Dye penetrant kit consists of cleaner, penetrant and developer.

2.2 Inspected specimen/welding metal.

The general steps can be summarized as follows:

5.0 Results / Data

Attach a photo of your inspection metal.

6.0 Calculation/Analysis data and result

Discuss the activity and observations being made.

Conclude your experiment based on objectives, results and discussion.

Prepared by Checked and Verified by:

You might also like