Marathon Pipe Line LLC (MPL) has a comprehensive program for monitoring the safety of its pipelines. Multiple types of inspections are used to assess pipeline integrity, including running in-line inspection tools. These tools check pipelines from the inside for metal loss, cracking and third-party damage, depending on the unique needs of each segment. Every mile of regulated pipeline is inspected at least every five years.
In-line inspections enable MPL to prioritize maintenance, and can prevent problems from occurring. Two of the most common in-line inspection tools are caliper/bend and metal-loss tools. These tools are loaded into the pipeline and carried through the line by the flow of product. The purpose of running a caliper/bend tool is to measure restrictions and deformations in the pipeline. The metal-loss tool is used to detect metal loss such as corrosion along the length of the pipeline. Both tools have on-board odometers to pinpoint where there may be a problem with the pipeline.
There are many benefits to performing in-line inspections. For MPL, it provides a way to identify and prioritize any required maintenance on the pipeline. The primary goal of running in-line inspection tools is to enhance safety. These inspections identify conditions that may not be a problem, but if left undetected, could pose a problem in the future.
MFL and GEO Combo Tool - Improved dent with metal loss detection
Magnetic Flux Leakage (MFL) Tool - Detects metal loss such as corrosion, gouges, mill anomalies, etc.
Ultrasonic Wall Measurement (UTWM) Tool - Detects metal loss and takes a direct measurement of wall thickness
Geometry (GEO) Tool - Detects geometric anomalies like dents, buckles, ripples, etc.
Electro Magnetic Acoustic Transducer (EMAT) Tool - Detects crack-like features in the seam and body as well as coating disbondment