Stress Corrosion Cracking Direct Assessment (SCCDA)

Stress Corrosion Cracking Direct Assessment (SCCDA) program is similar to the other direct assessment programs encompassing the same similar four phases.

Pre-Assessment – In the Pre-Assessment phase, as-built design, construction, operations and maintenance records are collated and analysed including historic and current data to determine possible SCC susceptible regions.

Indirect Inspection – This will be the second phase where pre-inspection planning is carried out followed by indirect inspections.  Where necessary, additional data are also collated.  The common data required in this phase include Close Interval Survey (CIS), Direct Current Voltage Gradient Surveys (DCVG), Soil type and Terrain Topography including Drainage survey data.

Direct Examination – During this phase, inspections are carried out at selected excavation sites for direct measurements using various types of Magnetic Particle Inspection techniques and others to determine if SCC exist.  If cracking is found, the data collated is used to carry out remaining strength analysis, root cause analysis and formulate and implement probable mitigation and monitoring measures.

Post-Assessment – This is the last phase where the remaining flaw sizes and corrosion growth rates are estimated for determining the next re-assessment interval.  Lastly, the data collated from the last three phases are also analysed to determine the effectiveness of the entire direct assessment process and updated for the next assessment cycle.

Expertise – GreenScience Technologies provides the complete range of SCCDA inspection programs and analysis including data integration and program development.