Pipeline cleaning pigs

There are also fully molded urethane pigs used for liquid removal or batching several different products in one line. There is no requirement for extensive line flushing. A greater sealing length is achieved with an articulated pig and as the front module loses drive when entering the wye piece, the rear module will then pick up the drive to enable the pig to complete its negotiation of the wye piece.

The principle of valve interlocking is the transfer of keys. Mechanical interlocks[ edit ] There are many reports of incidents in which operators have been injured or even killed while performing a pigging operation.

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Power for the electronics is typically provided by onboard batteries which are also sealed. This may be done by odometersgyroscope-assisted tilt sensors and other technologies. Other types are fully or criss-cross coated in urethane, or there are bare polyurethane foam pigs with a urethane coating just on the rear to seal and assist in driving the pig.

Pipeline pig washer

The external sensors may have Global Positioning System capability [17] to assist in their location. Power for the electronics is typically provided by onboard batteries which are also sealed. Capacitive sensor probes are used to detect defects in polyethylene pipe gas pipeline. But a lack of launchers and receivers - the equipment that allow pigs, spheres, and ILI tools often referred to as smart pigs to enter and exit the pipeline while product flow continues - makes pigging impossible. During an operating procedure, only one key at a time is free. Traditionally, the only way that an operator of a batch process could ensure a product was completely cleared from a line was to flush the line with a cleaning agent such as water or a solvent, or even with the next product. In , the first intelligent pig was run by Shell Development. A "pig" in the pipeline industry is a tool that is sent down a pipeline and propelled by the pressure of the product flow in the pipeline itself. Environmental benefits[ edit ] Pigging has a significant role to play in reducing the environmental impact of batch operations. Customization and configuration options ensure tailored solutions for even the most complex pipeline conditions. Pigs are used in lube oil or paint blending to clean the pipes to avoid cross-contamination, and to empty the pipes into the product tanks or sometimes to send a component back to its tank. By using a ball or universal joint assembly, two pigs can be connected together to form a Dual Module Pig or Articulated Pig. Some smart pigs use a combination of technologies, such as providing MFL and caliper functions in a single tool.

In addition, articulated pigs can be used for pigging pipelines with tight radius bends. Inline inspection pigs use various methods for inspecting a pipeline. The electronics are sealed to prevent leakage of the pipeline product into the electronics since products can range from being highly basic to highly acidic and can be of extremely high pressure and temperature.

Pipeline cleaning pigs

Inline inspection pigs use various methods for inspecting a pipeline. A pig launcher was featured in the season 2 episode "Pipeline Fever" of the animated show Archer TV series , wherein Sterling Archer and Lana Kane are tasked with going into a swamp and defending a pig launcher from radical environmentalist Joshua Gray. Data recording may be by various means ranging from analog tape, digital tape, or solid-state memory in more modern units. If the barrel is not completely depressurized, the pig can be ejected from the barrel and operators have been severely injured when standing in front of an open pig door. Etymology[ edit ] Some early cleaning "pigs" were made from straw bales wrapped in barbed wire [1] while others used leather. They vary in technology and complexity depending on the intended use and the manufacturer. Capacitive sensor probes are used to detect defects in polyethylene pipe gas pipeline. By using a ball or universal joint assembly, two pigs can be connected together to form a Dual Module Pig or Articulated Pig. Location verification[ edit ] Location verification is often accomplished by surface instruments that record the pig's passage by either audible, magnetic, radio-transmission or other means.
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