Internal Inspections

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.

Smart Pig

Material provided courtesy of PII Pipeline Solutions, a GE and Al Shaheen joint venture

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.

Loading Smart Pig

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.


(Images supplied by Rosen USA)

 

 
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MFL and GEO Combo Tool - Improved dent with metal loss detection

MFL and GEO Combo Tool - Improved dent with metal loss detection

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Magnetic Flux Leakage (MFL) Tool - Detects metal loss such as corrosion, gouges, mill anomalies, etc.

Magnetic Flux Leakage (MFL) Tool - Detects metal loss such as corrosion, gouges, mill anomalies, etc.

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Ultrasonic Wall Measurement (UTWM) Tool - Detects metal loss and takes a direct measurement of wall thickness

Ultrasonic Wall Measurement (UTWM) Tool - Detects metal loss and takes a direct measurement of wall thickness

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Geometry (GEO) Tool - Detects geometric anomalies like dents, buckles, ripples, etc.

Geometry (GEO) Tool - Detects geometric anomalies like dents, buckles, ripples, etc.

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Electro Magnetic Acoustic Transducer (EMAT) Tool - Detects crack-like features in the seam and body as well as coating disbondment

Electro Magnetic Acoustic Transducer (EMAT) Tool - Detects crack-like features in the seam and body as well as coating disbondment

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Ultrasonic Crack Detection (UTCD) Tool - Detects crack-like items in the seam and pipe body

Ultrasonic Crack Detection (UTCD) Tool - Detects crack-like items in the seam and pipe body