Quantitative electromagnetic measurements of in-service systems
G Finch, R Guilizzoni and S Harmon
National Physical Laboratory
The National Physical Laboratory (NPL) is the UK’s National Measurement Institute, applying traceable measurements to real-world situations. By comparing results with reference and measurement standards created and calibrated at NPL, these measurements can be taken from qualitative monitoring methods to quantitative measurements, ensuring accuracy and consistency.
A low-frequency eddy current inspection method has been developed to measure wall thickness changes in a storage vessel comprising two stainless steel walls with an insulation layer. Thickness measurements are demonstrated in the mm range. This technique could be applied for other situations, including corrosion under insulation inspection.
Magnetometry technologies that are being used for assessment of oil and gas pipelines have been tested in closely controlled conditions. This has enabled a greater understanding of the effect of pipeline flaws on material properties and the resultant magnetic field. Outcomes from this work will help reduce false call rates and support decision making on pipeline integrity.
Magnetometry technologies that are being used for assessment of oil and gas pipelines have been tested in closely controlled conditions. This has enabled a greater understanding of the effect of pipeline flaws on material properties and the resultant magnetic field. Outcomes from this work will help reduce false call rates and support decision making on pipeline integrity.
