𝑪𝑶𝑹𝑹𝑶𝑺𝑰𝑶𝑵 𝑴𝑨𝑷𝑷𝑰𝑵𝑮 𝑼𝑺𝑰𝑵𝑮 𝑯𝒀𝑫𝑹𝑶𝑭𝑶𝑨𝑴

Corrosion Mapping Using Hydrofoam is an advanced non-destructive testing (NDT) method, primarily used to detect and map corrosion or wall thinning in metal structures such as pipelines, tanks, and vessels.

Here’s a clear breakdown for better understanding:

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🧪 What is Hydrofoam?

Hydrofoam is a special foam-based coupling medium that is used in ultrasonic testing (UT). It helps transmit ultrasonic waves efficiently between the transducer and the surface being tested — even on irregular or vertical surfaces, where liquid couplants may not work well.

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🔍 What is Corrosion Mapping?

Corrosion mapping is a technique used to scan large surfaces and detect:

Internal and external corrosion

Erosion

Wall thickness loss

Pitting

It helps in predictive maintenance by identifying areas needing repair or replacement before failure.

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⚙️ How Corrosion Mapping Using Hydrofoam Works:

1. Surface Preparation:

Clean the area of paint, dirt, or loose corrosion.

No need to polish, just ensure smooth contact.

2. Apply Hydrofoam:

The foam is sprayed or applied as a pad on the surface.

Acts as a stable, consistent couplant for UT.

3. Ultrasonic Scanning:

A phased array UT (PAUT) or conventional UT probe is passed over the surface.

Hydrofoam ensures consistent wave transmission.

4. Data Collection:

UT device collects thickness measurements point by point or continuously.

Creates a 2D or 3D map showing wall thickness.

5. Result Analysis:

Areas with reduced thickness indicate corrosion.

Color-coded maps make defects easy to spot.

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✅ Advantages of Using Hydrofoam for Corrosion Mapping:

Works on vertical and overhead surfaces

No messy gel or water

Safer for electronic equipment (no liquid spill)

Can cover large areas quickly

Excellent resolution and accuracy

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📊 Applications:

Oil & Gas pipelines

Pressure vessels

Storage tanks

Marine and offshore platforms

Power plants