When the trench is completed, pre-coated segments of pipe, usually 40 ft in length, are transported from stockpiles in the staging area to the right-of-way. Gas pipeline operators monitor for any problems and handle the flow of gas through the pipeline us- ing a Supervisory Control and Data Acquisition system (SCADA). If a regulator senses that the pressure has dropped below a set point it will open accordingly to allow more gas to flow. Typically, for high-pressure pipelines, higher-grade pipe (such as. ) After this, the surface of the ROW is seeded and fertilized, and above-ground markers are placed along the pipeline path. While transmission pipelines may operate at pressures over 1000 psi, distribution systems operate at much lower pressures. Air compressors pump up the air, and the air is run thru a drier. Hoover over or click on the images below to explore each stage in Step 1: After the equipment is accessible in the staging area, work will begin to clear cut the pipeline right-of-way. When the pigs eventually exit the far end of the pipe clean, then the line will be filled with dry air. Natural gas is moved through pipelines as a result of a series of compressors creating pressure differen- tials – the gas flows from an area of high pressure to an area of relatively lower pressure. This water is sent through the pipeline and the pressure is increased to above the maximum operational level. This process involves pumping in clean water, pressured above the expected MAOP — maximum average operating pressure.
Looping provides increased storage of gas in the system to meet demands during peak use periods.
Staging areas are cleared and covered in rough stone gravel, often reinforced with large wood timber matting.
Conversely, when pressure rises above a set point, the regulator will close to adjust. Seamless pipe is seldom used in pipeline applications because of the higher unit cost and limited availability. PVC, fiberglass, polypropylene, and other materials may be used in low-pressure and utility applications. ANSE/ASME A53 and A106 and API 5L seamless, ERW, and submerged arc-welded (SAW) steel pipe are commercially available and most commonly used in pipeline systems.
They provide parking for construction equipment, employee trucks, and locations for office trailers. The flags mark the extent of the temporary construction zone surrounding the pipeline right-of-way (ROW), as well as the staging and storage areas. When those parameters get low enough, the complete pipeline is filled with nitrogen to absorb more of the remaining moisture. Compressor stations on transmission pipelines are generally built every 50 to 100 miles along the length of a transmission pipeline, allowing pressure to be increased as needed to keep the gas moving.
The operators must ensure that the gas reaches each customer with sufficient flow rate and pressure to fuel equipment and appliances. is selected because much-thinner-wall pipe can be used, which significantly reduces pipe costs. Seamless pipe is seldom used in pipeline applications because of the higher unit cost and limited availability. Typically, for high-pressure pipelines, higher-grade pipe (such as API 5L, Grades X42, X52, X60, and X65) is selected because much-thinner-wall pipe can be used, which significantly reduces pipe costs. If rocks ledges are encountered, track hoes with jack hammers are brought in to create the trench. Some gas transmission pipelines are bi-directional meaning gas can be coming from both ends of the pipeline, and depending on where gas is removed and where the compressors create the pressure differential, gas may flow either direction. The difference is, in deregulated states, you can choose to have the actual natural gas itself be supplied to the utility by another company, known as a supplier. Crews flag the boundaries of all locations where construction activities will take place.
As seen in several of the photos below, the hillsides are so steep that trench diggers are lowered and secured to larger bulldozers with a tether line. The current natural gas pipeline boom gives many homeowners a first row seat to the process of pipeline construction.
Before completing the project, the pipeline integrity must be verified using hydrostatic testing. These bi-directional pipelines boast of greater flex- ibility in both supply and price to customers. Note: this is not true for piping systems designed in accordance with the ANSI/ASME Standard B31.3. ANSI/ASME B31.4, B31.8, and the DOT regulations allow the use of alternative materials in very restricted applications. These areas can be located in fields, pasture, or forested land and can impact streams and wetlands. These areas are used to stockpile pipe and to store fuel tanks, sand bags, silt fencing, stakes, and equipment parts. The U.S. natural gas pipeline network is a highly integrated network that moves natural gas throughout the continental United States. This information allows pipeline operators to know what is happening along the pipeline, and allows quicker reactions for normal operations and to equipment malfunctions and releases. Additionally, valve stations are built above the right-of-way along the pipeline, allowing operators to shut off sections of the line for maintenance or in an emergency. A stump grinder then removes the remaining tree stumps in the ROW. The rush to move natural gas to markets places pipelines too close to homes, with construction taking place in backyards, farms, pastures, and right at the mailboxes of residents throughout the country. As one would expect compressor stations for large transmission lines are much bigger than the compressors used to move the gas through the small distribution lines to our homes. Metering stations are built along the length of pipelines, providing a measure of the flow of gas throughout the line.
Compressors are powered by electric or natural gas fired engines that compress or squeeze incoming gas and push it out at a higher pressure.
Construction plans for current proposed pipelines can be found on the FERC docket for that specific project.
Pipeline companies receive permits to withdraw millions of gallons of water from streams and rivers along the pipeline path.
Only then is the pipeline ready to transport natural gas.
If the pipeline remains intact during this test, it is deemed operational. After the pipe is inspected, the trench is filled in.
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