What is pig launcher and pig receiver?

In the oil and gas industry, pipeline maintenance and integrity are of utmost importance to ensure the flow of hydrocarbons efficiently and safely. One essential aspect of pipeline maintenance involves the use of pigging technology. Pigging refers to the practice of inserting devices known as "pigs" into pipelines to clean, inspect, or maintain their integrity. To facilitate the launching and receiving of these pigs, pig launchers and pig receivers are crucial components. In this article, we will explore what pig launchers and pig receivers are and their significance in pipeline operations.

Understanding Pig Launchers:

Pig launchers, also known as launchers or launching stations, are specifically designed containers used to inject or "launch" pigs into pipelines. These devices are located at the upstream end of a pipeline section and provide a means of introducing the pig into the pipeline while maintaining pipeline pressure and flow. Pig launchers are typically equipped with various valves, fittings, and closures that allow for the safe and controlled launching of pigs.

The primary function of a pig launcher is to ensure that the pig is propelled into the pipeline under pressure. To achieve this, pig launchers typically consist of three main sections:

i. Vessel Section: This section houses the pig until it is ready to be launched. It is designed to withstand high pressure and is equipped with a closure door or quick-opening closure that allows the pig to be launched safely into the pipeline.

ii. Launching Mechanism: The launching mechanism assists in propelling the pig into the pipeline. It includes devices such as pig traps, pushers, or pistons that create the necessary force to push the pig forward upon opening the closure door.

iii. Piping System: The piping system connects the vessel section to the pipeline, ensuring a smooth flow of the pig into the pipeline during launching. It is equipped with various valves and fittings that control the flow and pressure throughout the launching process.

Understanding Pig Receivers:

Pig receivers, also referred to as receivers or receiving stations, are the complementary components to pig launchers. Located at the downstream end of a pipeline section, pig receivers provide an interface to collect and recover the pig after it completes its journey through the pipeline.

Similar to pig launchers, pig receivers consist of three main sections:

i. Vessel Section: This section serves as a designated space for capturing the pig as it exits the pipeline. Like the pig launcher, it utilizes a closure door or quick-opening closure to create a sealed environment for pig recovery.

ii. Receiving Mechanism: The receiving mechanism helps in safely dampening the momentum of the pig and guiding it into the vessel section. It may include deflector plates or cushions to absorb the pig's impact and direct its path.

iii. Piping System: The piping system connects the vessel section to downstream equipment or storage facilities. It ensures that the pig can be safely removed from the vessel section and allows for further inspection or maintenance if required.

Conclusion:

Pig launchers and pig receivers are integral components of the pigging process, facilitating the safe and efficient maintenance of pipelines. While pig launchers inject pigs into the pipeline to perform various functions such as cleaning or inspecting, pig receivers collect these pigs post-pigging for inspection or disposal. Together, they enable the industry to maintain the integrity, efficiency, and longevity of pipelines.

If you have any further questions or require assistance with pigging technologies, do not hesitate to contact us.

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