When performing code compliant scans, B-Scan and Corrosion Mapping scanners serve different but essential roles in Ultrasonic Testing (UT). Understanding the distinction between these two methods is critical for ensuring compliance, assessing corrosion, and improving inspection efficiency.
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B-Scan: Essential for API 653 Compliance
For API 653 inspections on Aboveground Storage Tanks (AST), B-Scanning is the primary method used to assess tank wall thickness and detect material loss, corrosion, and safe liquid levels. Unlike corrosion mapping, which creates a full-surface visual scan, B-Scanning provides linear cross-sectional thickness readings (or drops) to ensure tanks meet industry regulations.
ScanTech’s X3 Spider is the premiere scanner for performing semi-automated B-Scan drops, while the APEX scanner offers both B-Scan and C-Scan capabilities, making it a versatile solution for any requirement. The Analyst X software is specifically designed for B-Scan data, providing accurate thickness measurements with automated tools to generate API 653 reports in less than a minute. As detailed in our blog, Why API 653 Reporting Matters for Asset Integrity – Our Advanced Software Solution, automated reporting significantly improves efficiency, reduces human error, and ensures compliance with industry regulations.
Key Advantages of B-Scanning for Tank Inspections
- ✔ Provides precise thickness measurements along a linear path (“drop”)
- ✔ Ensures API 653 compliance with built-in reporting tools
- ✔ Reduces manual data processing and increases accuracy
- ✔ Works effectively for localized corrosion detection
Corrosion Mapping Robotic Systems for Full-Surface C-Scan Imaging
While B-Scanning is essential for tank wall thickness evaluations, corrosion mapping (C-scanning) provides detailed, full-area assessments using raster scanning technology. This method is ideal for identifying widespread material loss across tank floors, ship hulls, pipelines, and large structures.
ScanTech’s C-Scan Solutions:
APEX Scanner
Capable of both B-Scanning and C-Scanning, using Analyst XR for corrosion mapping and Analyst X for B-scan reporting.
XR & Vertex Scanners
Optimized for pipe inspections, featuring Analyst XR software with a built-in ASME B31G algorithm for pipeline integrity assessments. These systems are not generally used for tanks but could be applied to large tanks and ship hulls in certain situations.
NDX System
A specialized C-scan unit used for mud drum and steam drum inspections, powered by Analyst NDX software.
Key Advantages of Corrosion Mapping with Robotic Scanners
- Provides full-surface imaging to identify widespread corrosion
- Uses raster scanning for high-resolution C-scan data
- Ideal for pipes, ship hulls, and large tank floor evaluations
- Enables detailed reporting with Analyst XR software and ASME B31G calculator
Choosing the Right Inspection System
For API 653 compliance, B-scanning remains the industry standard for tank wall thickness evaluations, while corrosion mapping robotic systems provide a comprehensive view of surface degradation across larger areas.
For regulatory compliance and thickness readings
B-Scanning with Analyst X Software
For full-surface corrosion assessment
C-Scanning with Analyst XR Software
For Pipe Inspections
XR or Apex with B31G Algorithm
For boiler tube inspections
NDX System with Analyst NDX Software
By selecting the right tool for the job, inspectors can optimize efficiency, accuracy, and compliance in every ultrasonic testing application.
Take the Next Step in Optimized Tank Inspections
Choosing the right ultrasonic inspection system is critical for ensuring API 653 compliance, accurate corrosion assessments, and efficient reporting. Whether you need B-Scanning for tank wall thickness evaluations or C-Scanning for full-surface corrosion mapping, ScanTech’s advanced NDT systems and industry-leading software provide the precision and reliability you need.
Ready to see our solutions in action? Book a demo today or schedule a meeting with our customer support team to learn how ScanTech can help you optimize your inspection process.
