pipeline
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What is a pipeline in technology?
A pipeline in technology refers to a line of pipe equipped with pumps, valves, and controls for moving liquids, gases, and slurries. Pipelines vary in size from 2-inch lines used in oil-well systems to 30-foot lines in water and sewage networks.
More generally, a pipeline is a direct channel for information or a process or channel of supply. Capsule pipelines transport freight in capsules propelled by a fluid. For thousands of years, pipelines have been constructed to convey water for drinking and irrigation.
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How is a pipeline used to transport materials?
Pipelines transport various materials, including liquids, gases, and solids, across short or long distances. They use pumps, valves, and control devices to move these materials. For liquids and gases, the material flows through the pipeline itself. For solids, two main methods exist:
- Slurry pipelines suspend fine particles in a liquid.
- Pneumatic pipelines use air to transport solid particles, employing suction or pressure lines.
Pipelines are a safe, economical, and reliable mode of transportation.
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What materials are commonly moved through pipelines?
Pipelines are versatile and essential for transporting various materials. They efficiently move liquids like water, liquid fertilizers, and crude oil, as well as gases like natural gas and carbon dioxide. Pipelines also transport slurries, which are mixtures of solids and liquids, such as coal or minerals mixed with water. Additionally, pneumatic pipelines use air to transport solids like grain, refuse, cement, and coal. These systems are favored for their safety, economy, and reliability.
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How does a pipeline keep materials flowing over long distances?
Pipelines maintain the flow of materials over long distances using a system of pipes, pumps, and control devices. The design includes determining the route, throughput, operational velocity, and pressure gradient.
Pumps (or compressors/blowers for gases) and booster stations placed along the pipeline help to overcome friction and maintain pressure, ensuring constant movement. Computer systems monitor pressure, flow rates, and other parameters, automatically controlling valves and pumps. These systems require occasional manual intervention.
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What are some challenges or dangers of using pipelines?
Pipeline technology, while generally safe, faces challenges. Potential dangers include explosions, environmental pollution from spills, and accidents, particularly with pipelines transporting natural gas, gasoline, and crude oil.
About half of all pipeline accidents in the U.S. are caused by third parties, such as construction workers damaging pipes. Corrosion, caused by contact with wet soil or corrosive fluids, is another leading cause of pipeline failure.
To mitigate these risks, pipeline companies implement measures such as educating the public, monitoring flow rates and pressure, performing visual inspections, and using "smart pigs" to detect flaws and corrosion. They also apply protective coatings and chemicals to prevent corrosion. Despite these efforts, pipeline safety remains a major concern, requiring continuous vigilance and improvement. Transferring oil by pipeline is less likely to result in spills or accidents.
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How do engineers monitor and maintain the safety of pipelines?
Engineers ensure pipeline safety through comprehensive monitoring and maintenance. Measures include educating the public and construction groups about pipeline locations to prevent third-party damage, which accounts for approximately half of all pipeline accidents in the US.
To combat corrosion, pipelines are covered with tape and use cathodic protection, along with chemical inhibitors to reduce internal corrosion.
Leak detection is achieved through computer monitoring of flow rates and pressure, aerial visual inspections, and the use of "smart pigs" to detect flaws and corrosion within the pipeline walls. These "pigs" carry instruments that detect cracks and corrosion of pipeline interiors. Highly corroded pipes are replaced before leaks occur. Additionally, sensors allow for remote monitoring and control of pipeline integrity and flow, with shutdown valves to divert flow upon leak detection.
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pipeline, line of pipe equipped with pumps and valves and other control devices for moving liquids, gases, and slurries (fine particles suspended in liquid). Pipeline sizes vary from the 2-inch- (5-centimetre-) diameter lines used in oil-well gathering systems to lines 30 feet (9 metres) across in high-volume water and sewage networks. Pipelines usually consist of sections of pipe made of metal (e.g., steel, cast iron, and aluminum), though some are constructed of concrete, clay products, and occasionally plastics. The sections are welded together and, in most cases, laid underground.
Most countries have an extensive network of pipelines. Because they are usually out of sight, their contribution to freight transport and their importance to the economy are often unrecognized by the general public. Yet, virtually all the water transported from treatment plants to individual households, all the natural gas from wellheads to individual users, and practically all the long-distance transportation of oil overland goes by pipeline.
Pipelines have been the preferred mode of transportation for liquid and gas over competing modes such as truck and rail for several reasons: they are less damaging to the environment, less susceptible to theft, and more economical, safe, convenient, and reliable than other modes. Although transporting solids by pipeline is more difficult and more costly than transporting liquid and gas by pipeline, in many situations pipelines have been chosen to transport solids ranging from coal and other minerals over long distances or to transport grain, rocks, cement, concrete, solid wastes, pulp, machine parts, books, and hundreds of other products over short distances. The list of solid cargoes transported by pipelines has been expanding steadily.
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History
For thousands of years, pipelines have been constructed in various parts of the world to convey water for drinking and irrigation. This includes ancient use in China of pipe made of hollow bamboo and the use of aqueducts by the Romans and Persians. The Chinese even used bamboo pipe to transmit natural gas to light their capital, Peking, as early as 400 bce.
A significant improvement of pipeline technology took place in the 18th century, when cast-iron pipes were used commercially. Another major milestone was the advent in the 19th century of steel pipe, which greatly increased the strength of pipes of all sizes. The development of high-strength steel pipes made it possible to transport natural gas and oil over long distances. Initially, all steel pipes had to be threaded together. This was difficult to do for large pipes, and they were apt to leak under high pressure. The application of welding to join pipes in the 1920s made it possible to construct leakproof, high-pressure, large-diameter pipelines. Today, most high-pressure piping consists of steel pipe with welded joints.
line of pipe equiMajor innovations since 1950 include introduction of ductile iron and large-diameter concrete pressure pipes for water; use of polyvinyl chloride (PVC) pipe for sewers; use of “pigs” to clean the interior of pipelines and to perform other duties; “batching” of different petroleum products in a common pipeline; application of cathodic protection to reduce corrosion and extend pipeline life; use of space-age technologies such as computers to control pipelines and microwave stations and satellites to communicate between headquarters and the field; and new technologies and extensive measures to prevent and detect pipeline leaks. Furthermore, many new devices have been invented or produced to facilitate pipeline construction. These include large side booms to lay pipes, machines to drill under rivers and roads for crossing, machines to bend large pipes in the field, and X rays to detect welding flaws.
Types
Pipelines can be categorized in different ways. In what follows, pipelines will be categorized according to the commodity transported and the type of fluid flow.
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Water and sewer lines
Pipelines are used universally to bring water from treatment plants to individual households or buildings. They form an underground network of pipe beneath cities and streets. Water pipelines are usually laid a few feet (one metre or more) underground, depending on the frost line of the location and the need for protection against accidental damage by digging or construction activities.
In modern water engineering, while copper tubing is commonly used for indoor plumbing, large-diameter outdoor high-pressure water mains (trunk lines) may use steel, ductile-iron, or concrete pressure pipes. Smaller-diameter lines (branch lines) may use steel, ductile-iron, or PVC pipes. When metal pipes are used to carry drinking water, the interior of the pipe often has a plastic or cement lining to prevent rusting, which may lead to a deterioration in water quality. The exteriors of metal pipes also are coated with an asphalt product and wrapped with special tape to reduce corrosion due to contact with certain soils. In addition, direct-current electrodes are often placed along steel pipelines in what is called cathodic protection.
Domestic sewage normally contains 98 percent water and 2 percent solids. The sewage transported by pipeline (sewers) is normally somewhat corrosive, but it is under low pressure. Depending on the pressure in the pipe and other conditions, sewer pipes are made of concrete, PVC, cast iron, or clay. PVC is especially popular for sizes less than 12 inches (30 centimetres) in diameter. Large-diameter storm sewers often use corrugated steel pipe.