REMEDIAL ENGINEERING

CORROSION MAPPING

ABHISHEK.G.H M-TECH(CONSTRUCTION TECHNOLOGY)

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

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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.

-:SCHEMATIC DIAGRAM:-

-:GRAPHICAL REPRESENTATION:-

-:COMPARISION:-

-:ROBOTIC INSTRUMENTS:-

HUGE STRUCTURES CAN BE ANALYSED

-:INSTRUMENTS:-

-: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.

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.

-: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.

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.

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

-: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.

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.

-: APPLICATIONS :-

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

-: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.

-: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.

-: THANK YOU :-