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What is a Dual Diameter Pig, and What Are They Useful For?

A dual diameter pig, also known as a bidirectional pig or a two-size pig, is a device used in pipeline maintenance and cleaning operations. It is designed with two different diameters along its length, allowing it to traverse through pipelines with varying internal diameters.

The primary purpose of a dual diameter pig is to clean, inspect, and maintain pipelines that have sections with different diameters.

Dual diameter pigs are useful tools in pipeline maintenance and cleaning operations, especially in pipelines with varying internal diameters. They facilitate efficient cleaning, inspection, and maintenance processes while allowing for the smooth transition between pipe sections of different sizes, maximizing pipeline integrity and functionality.

Pipeline inspection gauges (PIG)

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