Pig Launcher
Pipeline pig launcher, also called pig launcher or launching station, is a device positioned at the upstream end of a pipeline system. Its primary function is to safely and efficiently introduce pigs, cylindrical or bullet-shaped devices into the pipeline for various operational purposes. These pigs are vital for tasks like cleaning the pipeline of debris, inspecting its internal condition for corrosion or damage, separating different product batches, or dewatering/drying the line. The launcher typically consists of an oversized barrel section, larger in diameter than the main pipeline, equipped with a quick opening closure or door. This allows operators to load the pig into the barrel. Once the pig is loaded and the door is secured, a series of valves are manipulated to divert the flow of the pipeline's product (e.g., oil, gas, water, or air) behind the pig. The pressure from this flow then propels the pig into the main pipeline, initiating its journey. Safety interlocks and proper operational procedures are crucial to ensure the launcher is isolated and depressurized before opening, minimizing risks during pig insertion.
Pig Receiver
Pipeline pig receiver, also called pig catcher or receiving station, is a device installed at the downstream end of a pipeline system. Its primary purpose is to safely and efficiently capture and retrieve pigs, devices used for various operations within the pipeline. These pigs, which can be used for cleaning, inspecting, or separating different product batches, are propelled through the pipeline by the flow and pressure of the fluid. When a pig reaches the end of its journey, the receiver acts as a designated chamber to safely contain and remove it. The receiver typically has a larger diameter barrel than the main pipeline, equipped with an end closure or door that can be opened and closed to insert or extract the pig. It also features valves and bypass lines to control the flow, allowing for the safe isolation and depressurization of the receiver before the pig is removed, all without interrupting the main pipeline's operation.
