A client operated a number of subsea pipelines in dry gas service. These lines were not designed for in-line inspection but had been in service for some time and a validation of their condition was necessary. The inspection to validate condition was, therefore, to be performed using externally applied tools.
INSPECTION AND INTEGRITY ASSESSMENT ON UNPIGGABLE DRY GAS PIPELINE SUBSEA
The inspection and analysis performed by Sonomatic provided validation of the condition of the lines without the need for expensive modifications to facilitate in-line inspection. The inspection performance (accuracy and POD) delivered were critical in allowing validation based on a low coverage inspection. This, together with the use of ROV rather than diver deployed inspection, reduced the time and cost of the validation exercise.