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Challenge

The leading cause of failure in storage assets is corrosion. Even the smallest reduction in wall thickness can severely harm their integrity. Yet, isolated corrosion on large surfaces like tank shells can be very hard to identify. Currently, inspections of large areas are commonly carried out using only isolated point grids or line-scans. Not only is this method very time-consuming, it is also very unreliable when it comes to detecting small but potentially critical defects.

Key advantages

  • Fast in-service inspection concept
  • Full inspection coverage at excellent repeatability
  • High sensitivity to small defects, both internal and external
  • Operators get more than systematic samples of their asset’s condition. Instead, they can rely on accurate and detailed information on the status of its entire surface.
  • Real-time confirmation allows for a quick reaction to any report of critical defects, while a more detailed follow-up will provide an individual basis for an appropriate selection of further services, and ultimately for an effective integrity management strategy

The Solution

ROSEN’s Shell and Vessel Scanning service features an automated system that provides a comprehensive inspection of large areas. The extremely dependable EMAT technology delivers high-resolution scans of the entire wall area of large storage assets.

Without the need for scaffolding or external power supply, the free-climbing, battery-powered ROSEN crawler accesses and inspects the surfaces of objects such as:

  • Tank shells
  • Pressure vessels
  • Spheres
  • Bullets
  • Storage laterals

The ROSEN Shell and Vessel Scanning service can be performed externally as well as internally. On the one hand, this avoids that assets must be taken out of service for an inspection. On the other hand, it permits the inspection of insulated or underground assets.

Online data analysis and feature identification allow for a real-time confirmation of detected wall loss indications. After the inspection, large amounts of raw EMAT data are stored and processed, and the results are summarized in a clear and informative report. Data visualization provides an overview of defect positions and severity.

The ROSEN Shell and Vessel Scanning service is available as a stand-alone service or in combination with API 510 & 653 inspections.