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In-line Inspection (ILI)

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In-line Inspection (ILI) involves the evaluation of pipes and pipelines using “smart pigs” (both tethered and non-tethered) that utilize non-destructive examination techniques to detect and size internal damage. ILI measures and records irregularities in pipelines including corrosion, cracks, deformations, or other defects.

ILI is a common practice throughout the oil and gas industry and has proven invaluable for examining extensive pipelines. It makes inspecting the condition of long stretches of pipelines, a task that used to be incredibly expensive and time consuming, far more easy and economical.

There are several different types of smart pigs utilized in ILI activities, each with its own set of advantages and disadvantages. Some are more effective at detecting certain types of corrosion or damage in different types of pipes, depending on their NDE capabilities. More recently though, some manufacturers are combining the various functions of these separate tools into one. This way a single tool can now be used to detect several different types of damage, making it more efficient and effective.

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Articles about In-line Inspection (ILI)
July/August 2021 Inspectioneering Journal

The scope of the subject case study reviews an inspection and corrosion control assessment conducted on subsea flowlines and includes evaluating the flowlines’ associated inspection programs and identifying all available NDT technology solutions.

Blog

The 2019 API Inspection and Mechanical Integrity Summit will be kicking off later this month in Galveston, TX. This four-day event will begin with 14 high level training courses offered Monday, January 28th, and then a top notch conference and...

Authors: John Reynolds
November/December 2017 Inspectioneering Journal

This article explains the Statistically Active Corrosion Assessment, which is a tool for determining appropriate and realistic corrosion growth rates which can assist pipeline operators in optimizing the value of in-line inspection data.

March/April 2017 Inspectioneering Journal

The purpose of this article is to describe the various in-line inspection (ILI) technologies that are currently available to the market. The pros, cons, and applicability of each type of tool will be discussed in greater detail.

Authors: Matt Ellinger
May/June 2015 Inspectioneering Journal

For traditional in-line inspection (ILI) vendors, considering 21.4 miles of a piggable 4” diesel pipeline is typically not a big deal. However, significant threats like 3rd party damage and external corrosion seem to come with the territory in...

Partner Content

How long does it take for you to receive reports after an inspection has been completed? A week? A month? Does the data come from multiple sources with no way of knowing if it has been manipulated? Traditional inspection contractors do not have...

May/June 2015 Inspectioneering Journal

Historically, regulations regarding dent severity have been governed by one of two metrics: dent depth or strain. In the case of the former, plain dents with a depth up to 6% of the nominal diameter are permitted in both gas and liquid pipelines....

May/June 2015 Inspectioneering Journal

Verifying pipeline integrity is particularly challenging due to the difficulty of pipeline access, as well as the limitations in available technology to perform subsea wall thickness inspections. These challenges require action rather than reaction.

November/December 2011 Inspectioneering Journal

EPRI is investigating improved inspection technologies as part of a multi-faceted effort to enhance the understanding and management of underground piping and tanks at nuclear power plants. An ultrasonic immersion technique tested on an...

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