ARAS Intelligent Pig Research Group

MFL:  

It is a tool to measure and identify the defections on the pipe (like corrosion, gouges and so on) through sensing a powerful axial magnetic filed which is generated to saturate the pipe wall. If there is any defection (thickness reduction) inner or outer of the pipe, the amount of saturated magnetic field will be reduced and it will be measured by Hall sensors mounted around the PIG’s body and then recorded in the memories of electronic boards for later analysis.

TFI:

To detect longitudinally oriented anomalies such as tunnel corrosion, longitudinal weld anomalies, it is utilized and induced a flux field in the circumferential direction. It also has a good performance in measuring some sort of crack-like anomalies. The usage of this tool is not used on its own and it usually pass through pipeline accompanying with MFL to achieve better accuracy in detecting anomalies in pipeline.

Calliper (EGP):

The Calliper employs to inspect all geometry deviations on a pipeline. It is very important to locate such deviation because:

1. Variation in pipeline circular shape has negative effect on passing the product and increase consumption of power require for product transportation.
2. Calliper can be considered as an survey of pipeline mapping and it will be used for future inspection data synchronization and fitness-for-purpose assessments.

UT:

The principle of ultrasound inspection is commonly known – using echo signals and registering reception time difference between them. In intelligent pigging application these high frequency radial signals are emitted by UT transducers perpendicularly to a pipe wall. These signals produce two major echoes – from inner surface and outer surface of a pipe wall. The anomalies are detected through the registered difference between time periods of receiving the echo signals from healthy pipe (calibration values) and pipe wall with metal loss or any in-homogeneity.