UNPIGGABLE PIPELINES & ILI ALTERNATIVES

For many pipelines the use of In-Line intelligent pigs is not possible, these are considered to be “unpiggable pipelines”. Furthermore, operators are increasingly looking for alternative strategies to ILI to allow increased production time and decrease the risks associated with ILI inspection. For these cases, alternative inspection strategies are required. Identifying suitable inspection techniques and strategies is becoming an increasing concern as pipelines age and in many cases, exceed their design life.

Techniques and Deployment Tools

In the case of unpiggable pipelines or alternative strategies to ILI, a variety of techniques and deployment tools are often required. Typically inspection strategies fall into two approaches, an external screening approach covering as high a percentage of the pipeline as possible, or a targeted inspection approach identifying areas most susceptible to defects and applying high-resolution techniques. Regardless of the approach taken or inspection requirement, Sonomatic can provide the correct tool and techniques to fit the requirement. Sonomatic pairs our subsea inspection capability with a depth of NDT knowledge and integrity capability, to assist clients with picking the best strategy and techniques for meeting the requirement on unpiggable pipelines.

PROJECT EXAMPLES

INSPECTION AND INTEGRITY ASSESSMENT ON UNPIGGABLE DRY GAS PIPELINE

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...

MAG-ST SCREENING INSPECTION OF DEEP WATER UNPIGGABLE GAS PIPELINES

A client operated numerous subsea pipelines in gas service. These lines were not designed for inline inspection and had been in service for many years therefore an assessment of their condition was necessary...