Non Destructive tests widely used in detection of corrosion, rust in Rcc structures and in Metallic Materials.

1. CORROSION MAPPING
REMEDIAL ENGINEERING
ABHISHEK.G.H
M-TECH(CONSTRUCTION TECHNOLOGY)

2. INTRODUCTION:-
 Corrosion mapping is a non intrusive
technique which maps materials thickness
using ultrasonic technology.
 Variation in material thickness due to
corrosion can be identified and graphically
portrayed as an image format

3. Continue,,,,,,,,,,,,,,,,,
 Conventional manual ultrasonic inspection
is the most reliable technique for measuring
wall thickness.
 The measured wall thickness is read from
the ultrasonic device and reported.

4. -:SCHEMATIC DIAGRAM:-

5. -:GRAPHICAL REPRESENTATION:-

6. -:COMPARISION:-

8. -:ROBOTIC INSTRUMENTS:-

9. HUGE STRUCTURES CAN BE ANALYSED

10. -:INSTRUMENTS:-

11. -:M.C.MILLER TEST FOR CONCRETE
MAPPING:-
-:Preparation of test surface :-
 A. Use a measuring tape to lay out a grid of the
test location (typically) on four foot centers
covering the entire area which is to be tested.
 B. Mark each test location with the spray
paint.
 C. Remove all asphalt, waterproofed surface or
insulating films from each test location. This
requires only a spot about two inches square.

12.  D. All test points should be wetted with
electrical contact solution prior to testing,
and the location must still be damp at the
time of actual testing.

13. -:PROCEDURE:-
 1. Using the M.C. Miller concrete reference
electrode assembly, place the CuCuSO4
apparatus onto the concrete surface in an
area protected from foot and road traffic.
 2. Connect the reference cell to the reel of
test wire.

14.  3. Connected a test wire onto reinforced steel
site or metal component.
 4. Using the voltmeter, measure and record
the potential difference between the
reference cell and the reinforced steel or
metal component.
 5. With the reference cell assembly location
unchanged, repeat the procedure.
 6. Repeat as necessary to obtain sufficient
data.

15. -:TYPICAL CONCRETE SLAB WITH
REINFORCEMENT (REBAR):-

16. -:BENEFITS:-
 Thin locations are reproduced directly in
color, on-the-spot results.
 Indications can easily be measured, both in
surface and in form.
 High degree of reproducibility.

17.  No ionizing radiation with regard to the
taking of on-stream pictures.
 No disruption of other activities.
 Data, a constant C-scan, are digitally stored
and saved.

18. -: APPLICATIONS :-
 Pressure Vessels and Systems.
 Pipework (T-joints , elbow joints)
 Reactors.
 Storage Tanks.

19. -:LIMITATIONS:-
 110V - 240V Power Required.
 Material to be Inspected must be Penetrable
by Ultrasonic Sound Waves.
 Surface must be Clean & Free from Loose
Material, Rust etc.

20. -:CONCLUSION:-
 The techniques is widely used in oil and gas
industries for inservice detection and
characteristics of corrosion in pipes and
vessels.
 The data is stored on a computer and may be
color coded to show difference in thickness
readings.
 Corrosion may be mapped using zero degree
ultrasonic probes,an eddy current array and
or tiome of flight detection methods.

21. -: THANK YOU :-