Corrosion Mapping
Automated ultrasonic scanning to evaluate wall thickness loss and monitor asset degradation over time.
Overview
Corrosion Mapping uses automated ultrasonic scanners to capture dense wall-thickness data across large surface areas. The result is a detailed colour C-scan map of remaining wall thickness — enabling precise tracking of corrosion patterns, confident asset life-cycle planning, and early warning of integrity threats long before they become failures.
How the method works
An encoded ultrasonic scanner — typically a magnetic-wheel crawler or raster-scanned probe — captures thousands of thickness readings per square metre across the inspection surface. Software then renders the data as a high-resolution colour map of remaining wall thickness.
Repeat surveys at scheduled intervals provide direct corrosion-rate trending. This data feeds risk-based inspection (RBI) programmes and supports remaining-life calculations under API 510, 570, and 653 — turning inspection from a reactive cost into a strategic asset.
Modern corrosion mapping detects general thinning, pitting, MIC (microbiologically influenced corrosion), CUI (corrosion under insulation), and erosion-corrosion patterns — all without removing the component from service.
Why AUTRESONUS for CM
- Certified Level II/III corrosion mapping technicians with marine and petrochemical pedigree.
- Latest automated scanners — magnetic crawlers, raster systems, and PAUT-based mapping.
- Direct integration of survey data into client RBI and integrity management systems.
- Repeat-survey methodology designed for long-term corrosion-rate trending.
- 29+ years detecting corrosion threats before they become failures.
Key Benefits
- Quantitative wall-thickness data across entire surfaces
- Supports asset life-cycle and integrity planning under API codes
- Detects internal corrosion, pitting, and erosion patterns
- Repeat inspections enable accurate corrosion-rate trending
- High-resolution colour C-scan reporting for engineering review
- Performed in-service — no shutdown or vessel entry required
Our Inspection Process
- 1
Survey planning
Identify priority areas using historical data, RBI inputs, and operational risk.
- 2
Surface prep & calibration
Light surface cleaning and probe calibration on stepped reference blocks.
- 3
Automated scanning
Crawler or raster scan captures dense thickness grid across the inspection area.
- 4
Data processing
Generate colour C-scan, identify minimum thicknesses, and flag corrosion patterns.
- 5
Engineering report
Remaining wall, corrosion rate, and remaining-life estimate per code criteria.
Applications
- Storage tank floors, shells, and roofs
- Pressure vessels, separators, and reactors
- Pipeline corrosion under support and CUI
- Marine hull and structural plating
- Refinery process equipment and heat exchangers
- Subsea and topside risers
Codes & Standards
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