INSPECTION MODELLING

Ultrasonic inspection is widely used in the oil and gas, nuclear and energy sectors to determine the condition of equipment. In general, the objective is to identify and, if possible, quantify any degradation or defects that have the potential to threaten the integrity of the equipment. There is also an increasing emphasis on determining the performance of an inspection campaign. In the past, this has typically been addressed by validation trials on test pieces with built-in defects. However, the costs of such an approach are normally high and lengthy timescales can be involved. Ultrasonic modelling is an attractive alternative to validation trails that allows rapid and accurate assessment of the performance of an inspection. It also facilitates optimization of the approach to inspection through the evaluation of different parameters.

CIVA NDE Software

Sonomatic use CIVA NDE ultrasonic modelling software, originally developed in the French nuclear industry and is now used extensively in a range of major industries including power generation, aerospace, and oil and gas. CIVA is widely viewed as setting the standard for ultrasonic modelling and has been extensively validated. The software allows the evaluation of ultrasonic beam properties and interactions with a range of defect. Inspection situations can be simulated by:

  • Specification of the Component’s Geometry and Material Properties
  • Probe Characteristics

The output from CIVA is available in a variety of forms including the typical a, b, c and d scans that would be obtained from an ultrasonic inspection.

Application

Sonomatic's application of the CIVA NDE software covers the following areas:

  • Development and evaluation of inspection approaches for specific applications.
  • Demonstration of the capability of an inspection with respect to detection of specified defect sizes and locations.
  • Assessment of the sensitivity of inspection performance to system variables.
  • Assessment of areas covered by the inspection.
  • Development of delay laws for phased array inspection.
  • Analysis can be carried out on a wide range of geometries, from simple parametrically defined plate and pipe models, through to complex nozzles and 3D CAD defined components.
  • The software caters for a range of defect types.
  • A range of inspection approaches can be modelled.

PROJECT EXAMPLES

CIVA MODELLING OF TURBINE INSPECTION.

Steam turbine equipment requires periodic inspection. This requires removal of the blades which can be costly and time-consuming. Sonomatic were approached to determine whether inspection could be completed without removing the blades using advanced ultrasonic techniques...

CIVA MODELLING OF THE INSPECTION OF A NOZZLE TO DOMED END WELD ON A PRODUCTION SEPARATOR.

An inspection was required on a production separator to give confidence that no flaws were present within a nozzle weld following a dynamic loading event...