Unpiggable Pipelines & ILI Alternatives
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.
High Accuracy Verification Tools
Ultrasonic Corrosion Mapping
Ultrasonic corrosion mapping involves scanning the pipeline to determine the minimum remaining thickness for each position and can be achieved using conventional UT probe or a PAUT probe. The systems deployed produce comprehensive, high-quality data that can be displayed in different views to easily identify and/or verify any areas of concern. Sonomatic Inspection Management Software (SIMS) is used to generate 2D and 3D thickness map composites to improve efficiency in data management during the collection phase, and assists in semi-autonomous data analysis and reporting.
Time of Flight Diffraction (TOFD)
TOFD is an industry norm for pipeline weld inspection. This ultrasonic technique is the best method for defect detection and accurately sizing & monitoring the through-wall height of weld defects.
Phased Array inclusive of Full Matrix Capture (FMC/TFM)
Full matrix capture (FMC) is a data acquisition strategy that allows for the capture of every possible transmit-receive combination for a given ultrasonic phased array transducer.
Dynamic Response Spectroscopy (DRS)
DRS is a proprietary technology developed by Sonomatic using frequency-based ultrasonic wall thickness measurements. It is a corrosion mapping technique that applies a broad range of low ultrasonic frequencies (<1 MHz) to penetrate challenging coatings such as composite repairs, PE and Neoprene, and excites the natural frequencies of vibration of the underlying steel. The DRS probe raster scans over an area of interest and collects response signals. Advanced signal processing algorithms have been developed to extract the vibration frequencies and map the wall thickness profile.
InspeCT (Computerized Tomography)
InspeCT™ is Sonomatic’s proprietary subsea computed tomography system designed to eliminate the requirement to remove protective pipeline coatings, specifically concrete weight coating, to evaluate common pipeline integrity challenges including corrosion under insulation/coating, internal pitting & corrosion, degradation of internal linings & corrosion-resistant alloys, and detection & sizing of an internal build-up of deposits and scale.