Rapallo was consulted to inspect, examine, and assist with recommissioning an existing cyanide reagent tank. The cyanide tank was initially empty and had been removed from service. Rapallo was tasked to interrogate select deficiencies identified within the tank internals; and investigate further to then define remedial actions and finally implement the actions to enable timely tank recommissioning.
The client discussed that an initial independent inspection reported that the internal welds likely displayed preliminary onset of stress corrosion cracking at the weld heat affected zone. The uncoated steel tank had an unidentified duration of service, and limited original manufacturing information available.
Rapallo and the client identified and pursued a logical sequence of investigation. A variety of techniques were used as part of the investigation including:
- Magnetic particle inspection ( MPI )
- Phased Array ( PA )
- Time of flight diffraction ultrasonics ( TOFD )
- Positive material identification ( PMI )
This allowed our engineers to create areport with recommended actions that categorised and prioritised repairs. This enabled the tank to be recommissioned whist ongoing repairs are planned and executed.
