Visual inspection is a method of examining assets using the naked eye to identify non-conformities, often supporting other non-destructive testing (NDT) methods. It can include both unaided and aided visual techniques and is applied in various applications, notably in weld and hydraulic system inspections. While advantageous for its simplicity and speed, visual inspection has limitations such as being restricted to surface flaws and dependent on the inspector's skill.

1. VISUAL
INSPECTION
PRESENTED BY:
MANOJ PATIL M- 20MCD0038
SURAJ J R – 20MCD0050

2. INTRODUCTION:
 A visual inspection is an inspection of an asset made using only the naked eye.
This kind of inspection does not necessarily require any special equipment,
but it does require special training so that the inspector knows what to look
for as they visually review the asset.
 DEFINITION: Visual inspection is commonly defined as the examination of a
examination of a material, component or product for conditions of non-
conformance using light and the eyes, alone or in conjunction with various
aids.

3. VISUAL INSPECTION IN OTHER NDT
METHODS
 Visual inspection or visual testing is inherently part of all other NDT testing
methods.
 Visual inspection is commonly employed to compliment/ support other NDT
methods.
 Liquid penetrant testing uses dyes that rely on the inspector’s ability to
visually identify surface indications.
 Radiography technique require that the technician use a visual judgement to
determine the soundness of the object being tested.

4.  Visual testing includes all non-
destructive testing techniques that use
electromagnetic radiation in the field of
visible light, i.e., in the band of
wavelengths between 400 and 700 nm
approximately the geometry and power
of which can highlight the defects
sought.
 The basic requirements for correct
application of visual inspection are:
1. Good eyesight / vision of visual
inspector.
2. Good lighting conditions
3. Experienced and judgment of inspector

5. TYPES OF VISUAL INSPECTION:
Unaided or
direct visual
testing
Aided visual
testing

6. Unaided or direct visual testing:

7. Aided visual testing:

11. ILLUSTRATION OF SOME APPLICATIONS :
(CASE STUDIES)
VISUAL TESTING OF
WELDS:
Testing done in
accordance with relevant
codes and standards at all
stages that is
1. Before welding
2. During welding
3. After welding

12.  VISUAL TESTING OF
HYDRAULIC SYSTEMS:
1. Check the oil is clean
and clear.
2. Check the system is
clean and dry.
3. Listen for unusual
noises from the motor
pump and piping
system.

13. Other applications of visual testing:
1. Inspection of cleaning in
machines
2. Checking for corrosion
3. Checking for erosion and
deformities of machine
components
4. Check for ruptures
5. Check for cracks and wear in
machines and its parts
6. Monitoring of manometers
7. Monitoring operating
conditions of machines

14. Advantages:
1. Simple and easy to use
2. Relatively inexpensive
3. Testing speed is high
4. Almost all materials can be inspected
5. Permanent records are available when latest
equipments are used.
6. Testing can be performed on components which
are in-service
7. Training period to acquire skill is less
8. Good for obvious manufacturing flaws

15. Limitations :
1. Limited to detection of surface flaws
2. Eye fatigue
3. The results depends upon skill and
knowledge
4. Eye resolution is weak
5. Skilled inspector required
6. Sometimes requires line of sight
7. Reliability is limited