2009年2月7日星期六

Transportation in New York City



Background

An 1807 version of grid plan for Manhattan.

History
Main article: History of New York City transportation
The history of New York City's transportation system began with the Dutch port of Nieuw Amsterdam. The port had maintained several roads; some were built atop former Lenape trails, others as "commuter" links to surrounding cities, and one was even paved by 1658 from orders of Petrus Stuyvesant, according to Burrow, et al.The 19th century brought changes to the format of the system's transport- a street grid by 1811 (see the Commissioners' Plan of 1811), as well as an unprecedented link between New York and Brooklyn, then separate cities, via the Brooklyn Bridge, in 1883.
The Second Industrial Revolution fundamentally changed the city – the port infrastructure grew at such a rapid pace after the 1825 completion of the Erie Canal that New York became the most important connection between all of Europe and the interior of the United States. Elevated trains and subterranean transportation ('El trains' and 'subways') were introduced between 1867 and 1904. In 1904, the first subway line became operational.Practical private automobiles brought an additional change for the city by around 1930, notably the 1927 Holland Tunnel. With automobiles gaining importance, the later rise of Robert Moses was essential to creating New York's modern road infrastructure. Moses was the architect of all 416 miles of parkway, many other important roads, and seven great bridges.

Mass transit use and car ownership
New York City is distinguished from other cities in the United States by its significant use of public transportation. New York City has, by far, the highest rate of public transportation use of any American city, with 54.2% of workers commuting to work by this means in 2006.About one in every three users of mass transit in the United States and two-thirds of the nation's rail riders live in New York City or its suburbs. New York is the only city in the United States where over half of all households do not own a car (Manhattan's non-ownership is even higher - around 75%; nationally, the rate is 8%).

Percentage of workers using public transportation for their commute and the mean travel time for major cities in the United States in 2006
New York City also has the longest mean travel time for commuters (39 minutes) among major U.S. cities.

Environmental and social issues
New York City's uniquely high rate of public transit use makes it one of the most energy-efficient cities in the United States. Gasoline consumption in the city today is at the rate of the national average in the 1920s.New York City's high rate of transit use saved 1.8 billion gallons of oil in 2006 and $4.6 billion in gasoline costs. New York saves half of all the oil saved by transit nationwide.
The reduction in oil consumption meant 11.8 million metric tons of carbon dioxide pollution was kept out of the air.The New York City metro area was ranked by the Brookings Institution as the U.S. metro area with the lowest per-capita transportation-related carbon footprint and as the fourth lowest overall per-capita carbon footprint in 2005 among the 100 largest metro areas of the United States, outranked only by Honolulu and Los Angeles and Portland.
The city's transportation system, and the population density it makes possible, also have other effects. Scientists at Columbia University examined data from 13,102 adults in the city's five boroughs and identified correlations between New York's built environment and public health. New Yorkers residing in densely populated, pedestrian-friendly areas have significantly lower body mass index (BMI) levels compared to other New Yorkers. Three characteristics of the city environment -- living in areas with mixed residential and commercial uses, living near bus and subway stops and living in population-dense areas -- were found to be inversely associated with BMI levels.
See also: Environmental issues in New York City

Commuting/modal split

The Verrazano-Narrows Bridge links the boroughs of Brooklyn and Staten Island
Of all people who commute to work in New York City, 32% use the subway, 25% drive alone, 14% take the bus, 8% travel by commuter rail, 8% walk to work, 6% carpool, 1% use a taxi, 0.4% ride their bicycle to work, and 0.4% travel by ferry. 54% of households in New York City do not own a car, and rely on public transportation. While the so-called car culture dominates in most American cities, mass transit has a defining influence on New York life. The subway is a popular location for politicians to meet voters during elections and is also a major venue for musicians. Each week, more than 100 musicians and ensembles -- ranging in genre from classical to Cajun, bluegrass, African, South American and jazz -- give over 150 performances sanctioned by New York City Transit at 25 locations throughout the subway system.
New York City compared
Texas Transportation Institute Data
New York
Los Angeles
Chicago
Surveyed metro population
17.7 million
12.5 million
9.8 million
Annual congestion delay per person
23 hrs
50 hrs
37 hrs
Annual congestion cost per person
$383
$855
$631
Rush hours per day
6 hrs
8 hrs
8 hrs
Annual passenger miles of travel on public transit
18.5 billion
2.8 billion
2.2 billion
Annual congestion cost saved by public transit
$4.9 billion
$2.2 billion
$1.3 billion
Excess fuel consumed per person due to congestion
11 gal(42 L)
33 gal(125 L)
23 gal(87 L)
Data from 2003 TTI Urban Mobility Report
3.7 million people were employed in New York City; Manhattan is the main employment center with 56% of all jobs. Of those working in Manhattan, 30% commute from within Manhattan, while 17% come from Queens, 16% from Brooklyn, 8% from the Bronx, and 2.5% from Staten Island. Another 4.5% commute to Manhattan from Nassau County and 2% from Suffolk County on Long Island, while 4% commute from Westchester County. 5% commute from Bergen and Hudson counties in New Jersey. Some commuters come from Fairfield County in Connecticut. Some New Yorkers reverse commute to the suburbs: 3% travel to Nassau County, 1.5% to Westchester County, 0.7% to Hudson County, 0.6% to Bergen County, 0.5% to Suffolk County, and smaller percentages to other places in the metropolitan area.[15]

Intracity transportation

Railroads

The New York City Subway is the lifeblood of the city.
By far the dominant mode of transportation in New York City is rail. Only 6% of shopping trips in Manhattan's Central Business District involve the use of a car. The city's public transportation network is the most extensive and among the oldest in North America. Responsibility for managing the various components of the system falls to several government agencies. The largest and most important is the Metropolitan Transportation Authority (MTA), a public benefit corporation in the state of New York, which runs all of the city's subways and buses and two of its three commuter rail networks. Ridership in the city increased 36% to 2.2 billion annual riders from 1995 to 2005, far outpacing population growth. Average weekday subway ridership was 5.076 million in September 2006, while combined subway and bus ridership on an average weekday that month was 7.61 million.

Station entrance to the 59th Street-Columbus Circle station.
New York City Subway
Main article: New York City Subway
The New York City Subway is the largest rapid transit system in the world when measured by track mileage (656 miles, or 1,056 km of mainline track), and the fourth-largest when measured by annual ridership (1.4 billion passenger trips in 2005).[5] It is the second-oldest subway system in the United States after the rapid transit system in Boston. In 2002, an average 4.8 million passengers used the subway each weekday. During one day in September 2005, 7.5 million daily riders set a record for ridership. Life in New York City is so dependent on the subway that the city is home to two of only three 24-hour subway systems in the world.The city's 26 subway lines run through all boroughs except Staten Island, which is served by the Staten Island Railway.
Subway riders pay with the MetroCard, which is also valid on all other rapid transit systems and buses in the city, as well as the Roosevelt Island tramway. The MetroCard has completely replaced tokens, which were used in the past, to pay fares. Fares are loaded electronically on the card.

A PATH train at the World Trade Center station.
PATH
Main article: Port Authority Trans-Hudson
The Port Authority Trans-Hudson (PATH) is a subway system that links Manhattan, in New York State, to Jersey City, Hoboken, Harrison, and Newark, in New Jersey. The primary transit link between Manhattan and New Jersey, PATH carries 240,000 passengers each weekday on four lines.While some PATH stations are adjacent to subway stations in New York City and Newark as well as Hudson-Bergen Light Rail stations in New Jersey, there are no free transfers. The PATH system spans 13.8 miles (22.2 km) of route mileage, not including track overlap. Like the New York City Subway, PATH operates 24 hours a day. Opened in 1908 as the Hudson and Manhattan Railroad, a privately owned corporation, PATH since 1962 has been operated by the Port Authority of New York and New Jersey.

AirTrain at John F. Kennedy International Airport.
Airport services
Main articles: AirTrain JFK and AirTrain Newark
Kennedy and Newark airports are served by intermodal rail systems. AirTrain JFK is an 8.1 mile (13 km) rapid transit system that connects Kennedy to New York's subway and commuter rail network in Queens. It also provides free transit between airport terminals. For trips beyond the airport the train costs $5. Roughly 4 million people rode the AirTrain to and from Kennedy in 2006, an increase of about 15% over 2005.[22] AirTrain Newark is a 1.9 mile (3 km) monorail system connecting Newark's three terminals to commuter and intercity trains running on the Northeast Corridor rail line.
Commuter rail

Grand Central Terminal, second busiest rail station in the country.
Main articles: Long Island Rail Road, Metro-North Railroad, and New Jersey Transit
New York City's commuter rail system is the most extensive in the United States, with about 250 stations and 20 rail lines serving more than 150 million commuters annually in the tri-state region.Commuter rail service from the suburbs is operated by two agencies. The MTA operates the Long Island Rail Road on Long Island and the Metro-North Railroad in the Hudson Valley and Connecticut. New Jersey Transit operates the rail network on the New Jersey side of the Hudson River. These rail systems converge at the two busiest train stations in the United States, Penn Station and Grand Central Terminal, both in Manhattan.
Intercity Rail
Main article: Northeast Corridor
Intercity train service from New York City is provided by Amtrak. 54 trains run each day on the busiest route, New York to Philadelphia. For trips of less than 500 miles to other Northeastern cities Amtrak is often cheaper and faster than air travel. Amtrak accounts for 47% of all non-automobile intercity trips between New York and Washington, D.C. and about 14% of all intercity trips (including those by automobile) between those cities.Amtrak's high-speed Acela trains run from New York to Boston and Washington, D.C. using tilting technology and fast electric locomotives. New York City's Penn Station is the busiest Amtrak station in the United States by annual boardings. In 2004 it saw 4.4 million passenger boardings, more than double the next busiest station, Union Station in Washington, D.C.
Major destinations with frequent service include Albany, Baltimore, Boston, New Haven, Philadelphia and Washington, D.C., as well as the Canadian cities Toronto and Montreal. There are also trains to Upstate New York, New England and destinations in the South and Midwest.

An Orion VII hybrid bus on the Upper West Side of Manhattan.

Buses
Main article: MTA Regional Bus Operations
See also: New York City Transit buses, MTA Bus Company, Buses in New York City, and Select Bus Service
New York City's bus network is extensive, with approximately 5,800 buses carrying about 2.01 million passengers every day on more than 200 local routes and 30 express routes.[26] Buses owned by MTA account for 80% of the city's surface mass transit.[5] New York City has the largest clean air diesel-hybrid and compressed natural gas bus fleet in the United States.[26]
Buses are labeled with a number and a prefix identifying the primary borough (B for Brooklyn, Bx for the Bronx, M for Manhattan, Q for Queens, and S for Staten Island). Express buses operated under MTA New York City Bus use the letter "x" rather than a borough label. Express buses routes operated under MTA Bus formerly controlled by the NYC Department of Transportation use a two-borough system with M at the end (i.e., BxM, QM, or BM).
The Port Authority Bus Terminal, near Times Square, is the busiest bus station in the United States and the main gateway for interstate buses into New York City. The terminal serves both commuter routes, mainly operated by New Jersey Transit, and national routes operated by companies such as Greyhound and Peter Pan. Two discount services, Boltbus and Megabus announced discount intercity coach services to begin in late March 2008.

[edit] Intercity bus stations
Intercity bus operators use the following stations:
Borough
Major terminals
Manhattan:
Port Authority Bus Terminal (most intercity bus operators)
George Washington Bridge Bus Terminal (New Jersey Transit and Coach USA Rockland Coaches)
New York Penn Station (Megabus and BoltBus)
New Yorker Hotel (BoltBus and NeOn)
Brooklyn:
Brooklyn Station
Queens:
LaGuardia Airport
John F. Kennedy International Airport - Terminal 4
Queens Village: JD Foods LLC
Ferries

The Staten Island Ferry between Lower Manhattan and Staten Island.
The busiest ferry in the United States is the Staten Island Ferry, which annually carries over 19 million passengers on the 5.2 mile (8.4 km) run between Staten Island and Lower Manhattan. Service is provided 24 hours a day, 365 days a year, and takes approximately 25 minutes each way. Each day approximately five boats transport almost 65,000 passengers during 104 boat trips. Over 33,000 trips are made annually.[30] The Ferry has remained free of charge since 1997. The charge for vehicles is $3, however, vehicles have not been allowed on the Ferry since the September 11, 2001 terrorist attacks. Bicycles are allowed on the lower level for free, as well. The ferry ride is a favorite of tourists as it provides excellent views of the Lower Manhattan skyline and the Statue of Liberty.
Major privately run ferry companies include the BillyBey Ferry Company and NY Waterway who operate several routes from New Jersey to Manhattan; SeaStreak, which provides service from Monmouth County to Manhattan; New York Water Taxi, which provides service from Brooklyn and Queens to Manhattan; and Liberty Water Taxi which provides service from Liberty State Park and Jersey City to the World Financial Center.

Private cars

Rush hour in Manhattan
Main article: New York congestion pricing
Around 48% of New Yorkers own cars, yet fewer than 30% use them to commute to work, most finding public transportation cheaper and more convenient for that purpose, due in large part to traffic congestion which also slows buses. To ease traffic, the Mayor, Michael Bloomberg, in 2007 proposed congestion pricing for motor vehicles entering Manhattan's business district from 6:00 a.m. to 6:00 p.m. However, this proposal was defeated when Sheldon Silver Speaker of the New York State Assembly announced that the bill would not come up for a vote in his chamber.
Traffic on highways at the edge of the area would not be charged. Transit buses, emergency vehicles, taxis and for-hire vehicles, and vehicles with handicapped license plates, would also not be charged the fee. Vehicles would be charged only once per day.
An advanced convergence indexing road traffic monitoring system was installed in New York City for testing purposes in May 2008.

Roads
Despite New York's reliance on public transit, roads are a defining feature of the city. Manhattan's street grid plan greatly influenced the city's physical development. Several of the city's streets and avenues, like Broadway, Wall Street and Madison Avenue are also used as shorthand or metonym in American vernacular for national industries located there: theater, finance, and advertising, respectively.
There are twelve avenues that run parallel to the Hudson River, and 220 numbered streets that run perpendicular to the river.
See also: Geography and environment of New York City

The Brooklyn Bridge, one of New York's most recognizable structures.

Bridges and tunnels
Main article: Bridges and tunnels in New York City
With its Gothic-revival double-arched stone towers and diagonal suspension wires, the Brooklyn Bridge is one of the city's most recognized architectural structures, depicted by artists such as Hart Crane and Georgia O'Keeffe. The Brooklyn Bridge's main span is 1,596 feet and 6 inches, and was the longest in the world when it was completed. The Williamsburg Bridge and Manhattan Bridge are the two others in the trio of architecturally-notable East River crossings. The Queensboro Bridge, which links Manhattan and Queens, is an important piece of cantilever bridge design. The borough of Staten Island is connected to Brooklyn through the Verrazano-Narrows Bridge. The towers of the Verrazano, which rise 650 feet above the water, are 4,260 feet apart; these towers are so far away from each other, due to the length of the main span, that there is a 13⁄8 inches (34 mm) displacement between the theoretical position of the side at the top of the tower, and the actual position, due to the Earth's curvature.
New York has historically been a pioneer in tunnel construction. The Lincoln Tunnel, which carries 120,000 vehicles per day under the Hudson River between New Jersey and Manhattan, is the world's busiest vehicular tunnel. The Holland Tunnel, also under the Hudson River, was the first mechanically ventilated vehicular tunnel in the world and is considered a National Civil Engineering Landmark by the American Society of Civil Engineers. Two other notable tunnels connect Manhattan to other places; one is the Queens Midtown Tunnel, and the other the Brooklyn-Battery Tunnel. At 9,117 feet (2,779 m), the Brooklyn-Battery Tunnel is the longest underwater tunnel in North America.

The Queens Midtown Tunnel is the start of the Long Island Expressway.

Expressways
A less favored alternative to commuting by rail and boat is the New York region's outdated and congested expressway network, designed by Robert Moses. The city's extensive network of expressways includes four primary Interstate Highways: I-78, I-80, I-87 and I-95. I-278 serves as a partial beltway around the city. The Long Island Expressway begins at the Queens Midtown Tunnel and runs through the heart of Queens east into the Long Island suburbs.
Also designed by Moses are a series of limited-access parkways, which are frequently congested with traffic as well, despite the fact that they were designed from the outset to only carry cars, as opposed to commercial trucks or buses. The FDR Drive and Harlem River Drive are two such routes through Manhattan. The Henry Hudson Parkway, the Bronx River Parkway and the Hutchinson River Parkway link the Bronx to nearby Westchester County and its parkways, and the Grand Central Parkway and Belt Parkway provide similar functions for Long Island's parkway system.

NYC yellow taxi livery.

Taxis
Main article: New York City Taxi and Limousine Commission
There are 13,087 taxis operating in New York City, not including over 40,000 other for-hire vehicles.[32] Their distinctive yellow paint has made them New York icons.
Taxicabs are operated by private companies and licensed by the New York City Taxi and Limousine Commission. "Medallion taxis", the familiar yellow cabs, are the only vehicles in the city permitted to pick up passengers in response to a street hail. A cab’s availability is indicated by the lights on the top of the car. When just the center light showing the medallion number is lit, the cab is empty and available. When no lights are lit, the cab is occupied by passengers.
Fares begin at US$2.50 (US$3.00 after 8:00pm, and US$3.50 during the peak weekday hours of 4:00pm to 8:00pm) and increase based on the distance traveled and time spent in slow traffic. The passenger also must pay the fare whenever a cab is driven through a toll. The average cab fare in 2000 was US$6.00; over US$1 billion in fares were paid that year in total241 million passengers rode in New York taxis in 1999. According to the 2000 U.S. Census, of the 42,000 cabbies in New York, 82% are foreign born: 23% from the Caribbean (the Dominican Republic and Haiti), and 20% from South Asia (India, Pakistan, and Bangladesh).[citation needed]
In 2005, New York introduced incentives to replace its current yellow cabs with electric hybrid vehicles then in May 2007, New York City Mayor, Michael Bloomberg, proposed a five-year plan to switch New York City's taxicabs to more fuel-efficient hybrid vehicles as part of an agenda for New York City to reduce greenhouse gas emissions as well as surging fuel costs.

A cycle rickshaw at rest in Manhattan.

Pedestrians and bicycles
Cycling in New York City is a growing mode of transport. An estimated 120,000 city residents bicycle on a typical day, and make 400,000 trips each day, equivalent to the number of the ten most popular bus routes in the city.[36] The City Department of Transportation estimates there are an additional two in-line skaters for every cyclist in New York. The city has 420 miles of bike lanes (as of 2005) including the Manhattan Waterfront Greenway and has in recent years expanded separated bike lanes on major thoroughfares and on bridges across the East River. As part of PlaNYC 2030, bike lanes will be added at a rate of about 100 miles per year until 2010, and 1,800 miles should be completed by 2030. More than 500 people annually work as bicycle rickshaw drivers, who in 2005 handled one million passengers.[37] However, the City Council recently voted to curtail and license pedicab drivers, and will only allow 325 pedicab licenses. The city also annually presents the largest recreational cycling event in the United States, the Five Boro Bike Tour, in which 30,000 cyclists ride 42 miles (65 km) through the city's boroughs.
Walk and bicycle modes of travel account for 21% of all modes for trips in the city; nationally the rate for metro regions is about 8%. In 2000 New York had the largest number of walking commuters among large American cities in both total number and as a proportion of all commuters: 517,290, or 5.6%. By way of comparison, the next city with the largest proportion of walking commuters, Boston, had 119,294 commuter pedestrians, amounting to 4.1% of that city's commuters.

Semi-formal

Passengers at the ticket window of a Chinatown bus company.
New York has many forms of semi-formal public transportation, including "dollar vans" and "Chinese vans." Dollar vans serve major corridors in Brooklyn, Queens and the Bronx that lack adequate subway service. In 2006, the New York City Council began debate on greater industry regulation, including requiring all dollar vans to be painted in a specific color to make them easier to recognize, similar to the public light buses in Hong Kong. The vans pick up and drop off anywhere along a route, and payment is made at the end of a trip.
Similar to dollar vans, Chinese vans serve predominantly Chinese and other East Asian communities in Brooklyn's Chinatown, Manhattan's Chinatown, Elmhurst and Flushing.
There are also highly competitive Chinatown bus lines operating routes from New York City's Chinatowns to other Chinatowns in the Northeast, with frequent service to major cities like Boston and Philadelphia. These bus companies use full-size coaches and offer fares much lower than traditional carriers like Greyhound. However, traditional carriers Greyhound and Coach USA have gone after these carriers by offering online fares as low as $1 on BoltBus, NeOn, and Megabus services.
There are numerous other transportation services in the city, including RightRides.org, a free car service operated by a grassroots nonprofit that shuttles women and transgender individuals home on Saturday nights from midnight to 3 a.m. in Manhattan, Queens, the Bronx and Brooklyn. RightRides is made possible by volunteer teams driving vehicles donated by Zipcar, a membership-based carsharing company providing hourly or daily car rentals in New York City to its members, who often do not own cars.

Roosevelt Island Tramway over the East River.

Aerial tramway
Main article: Roosevelt Island Tramway
Built in 1976 to shuttle island residents to Midtown, the Roosevelt Island Tramway was originally intended to be a temporary commuter link for use until a subway station was established for the island. However, when the subway finally connected to Roosevelt Island in 1989, the tram was too popular to discontinue use.
The Tramway is operated by the Roosevelt Island Operating Corp (RIOC). Each cable car has a capacity of 125 passengers. Travel time from Roosevelt Island to Manhattan is just under five minutes and the fare is the same as a subway ride.
In 2006, service was suspended on the tramway for six months after a service malfunction that required all passengers to be evacuated.

Port Infrastructure

Airports
Main article: Aviation in New York City

An Air India 747 arrives at JFK, with El Al Israel and Swiss International jets at Terminal 4. JFK is the largest entry point for international arrivals to the United States.
New York City is the top international air passenger gateway to the United States. 100 million travelers used the city's airports in 2005; New York is the busiest air gateway in the nation.
The city is served by three major airports: John F. Kennedy International (also known as JFK), Newark Liberty International, and LaGuardia. Teterboro serves as a primary general aviation airport. JFK and Newark both connect to regional rail systems by a light rail service.
JFK and Newark serve long-haul domestic and international flights. The two airports' outbound international travel accounted for about a quarter of all U.S. travelers who went overseas in 2004. LaGuardia caters to short-haul and domestic destinations.
JFK is the major entry point for international arrivals in the United States and is the largest international air freight gateway in the nation by value of shipments.About 100 airlines from more than 50 countries operate direct flights to JFK. The JFK-London Heathrow route is the leading U.S. international airport pair. The airport is located along Jamaica Bay near Howard Beach, Queens, about 12 miles east of downtown Manhattan.
Newark was the first major airport serving New York City and is the fifth busiest international air gateway to the United States.[41] Amelia Earhart dedicated the Newark Airport Administration Building in 1935, which was North America's first commercial airline terminal. In 2003, Newark became the terminus of the world's longest non-stop scheduled airline route, Continental's service to Hong Kong. In 2004, Singapore Airlines broke Continental's record by starting direct 18-hour flights to Singapore. The airport is located in Newark, New Jersey, about 12 miles west of downtown Manhattan.
LaGuardia, the smallest of New York's primary airports, handles domestic flights. It is named for Fiorello H. LaGuardia, the city's great Depression-era mayor known as a reformist and strong supporter of the New Deal. A perimeter rule prohibits incoming and outgoing flights that exceed 1,500 miles (2,400 km) except on Saturdays, when the ban is lifted, and to Denver, which has a grandfathered exemption. As a result, most transcontinental and international flights use JFK and Newark. The airport is located in northern Queens about 6 miles from downtown Manhattan.
Manhattan has three public heliports, used mostly by business travelers. A regularly-scheduled helicopter service operates flights to JFK Airport from the Downtown Manhattan Heliport, located at the eastern end of Wall Street.
See also: Transportation to New York City area airports

Pipeline transport



Types by transport function
In general, pipelines can be classified in three categories depending on purpose:
1. Gathering Pipelines - Group of smaller interconnected pipelines forming complex networks with the purpose of bringing crude oil or natural gas from several nearby wells to a treatment plant or processing facility. In this group, pipelines are usually short- a couple of hundred meters- and with small diameters. Also sub-sea pipelines for collecting product from deep water production platforms are considered gathering systems.2. Transportation Pipelines - Mainly long pipes with large diameters, moving products (oil, gas, refined products) between cities, countries and even continents. These transportation networks include several compressor stations in gas lines or pump stations for crude and multiproducts pipelines.3. Distribution Pipelines - Composed of several interconnected pipelines with small diameters, used to take the products to the final consumer. Feeder lines to distribute gas to homes and businesses downstream. Pipelines at terminals for distributing products to tanks and storage facilities are included in this group.

Operation
When a pipeline is built, the construction project not only covers the civil work to lay the pipeline and build the pump/compressor stations, it also has to cover all the work related to the installation of the field devices that will support remote operation.
Field devices are instrumentation, data gathering units and communication systems. The field Instrumentation includes flow, pressure and temperature gauges/transmitters, and other devices to measure the relevant data required. These instruments are installed along the pipeline on some specific locations, such as injection or delivery stations, pump stations (liquid pipelines) or compressor stations (gas pipelines), and block valve stations.
The information measured by these field instruments is then gathered in local Remote Terminal Units (RTU) that transfer the field data to a central location in real time using communication systems, such as satellite channels, microwave links, or cellular phone connections.
Pipelines are controlled and operated remotely, from what is usually known as The Main Control Room. In this center, all the data related to field measurement is consolidated in one central database. The data is received from multiple RTUs along the pipeline. It is common to find RTUs installed at every station along the pipeline.

The SCADA System for pipelines.
The SCADA system at the Main Control Room receives all the field data and presents it to the pipeline operator through a set of screens or SCADA#Human Machine Interface, showing the operational conditions of the pipeline. The operator can monitor the hydraulic conditions of the line, as well as send operational commands (open/close valves, turn on/off compressors or pumps, change setpoints, etc.) through the SCADA system to the field.
To optimize and secure the operation of these assets, some pipeline companies are using what is called Advanced Pipeline Applications, which are software tools installed on top of the SCADA system, that provide extended functionality to perform leak detection, leak location, batch tracking (liquid lines), pig tracking, composition tracking, predictive modeling, look ahead modeling, operator training and more.

Technology

Components
Pipeline networks are composed of several pieces of equipment that operate together to move products from location to location. The main elements of a pipeline system are:

A pipeline schematic.
- Initial Injection Station - Known also as Supply or Inlet station, is the beginning of the system, where the product is injected into the line. Storage facilities, pumps or compressors are usually located at these locations.
- Compressor/Pump Stations - Pumps for liquid pipelines and Compressors for gas pipelines, are located along the line to move the product through the pipeline. The location of these stations is defined by the topography of the terrain, the type of product being transported, or operational conditions of the network.
- Partial Delivery Station - Known also as Intermediate Stations, these facilities allow the pipeline operator to deliver part of the product being transported.
- Block Valve Station - These are the first line of protection for pipelines. With these valves the operator can isolate any segment of the line for maintenance work or isolate a rupture or leak. Block valve stations are usually located every 20 to 30 miles (48 km), depending on the type of pipeline. Even though it is not a design rule, it is a very usual practice in liquid pipelines. The location of these stations depends exclusively on the nature of the product being transported, the trajectory of the pipeline and/or the operational conditions of the line.
- Regulator Station - This is a special type of valve station, where the operator can release some of the pressure from the line. Regulators are usually located at the downhill side of a peak.
- Final Delivery Station - Known also as Outlet stations or Terminals, this is where the product will be distributed to the consumer. It could be a tank terminal for liquid pipelines or a connection to a distribution network for gas pipelines.

Leak detection systems
Since oil and gas pipelines are an important asset of the economic development of almost any country, it has been required either by government regulations or internal policies to ensure the safety of the assets, and the population and environment where these pipelines run.
Pipeline companies face government regulation, environmental constraints and social situations. Pipeline companies should comply with government regulations which may define minimum staff to run the operation, operator training requirements, up to specifics including pipeline facilities, technology and applications required to ensure operational safety. As an example, in the State of Washington, it is mandatory for pipeline operators to be able to detect and locate leaks of 8 percent of maximum flow within 15 minutes or less.
The social situation also affects the operation of pipelines. In third world countries, product theft is a problem for pipeline companies. It is common to find unauthorized extractions in the middle of the pipeline. In this case, the detection levels should be under 2 percent of maximum flow, with a high expectation for location accuracy.
Different types of technologies and strategies have been implemented, from physically walking the lines to satellite surveillance. The most common technology to protect these lines from occasional leaks is known as Computational Pipeline Monitoring Systems or CPM. CPM takes information from the field related to pressures, flows, and temperatures to estimate the hydraulic behavior of the product being transported. Once the estimation is done, the results are compared to other field references to detect the presence of an anomaly or unexpected situation, which may be related to a leak.
The American Petroleum Institute has published several articles related to the performance of CPM in liquids pipelines, the API Publications are:
- API 1130 – Computational pipeline monitoring for liquids pipelines
- API 1155 – Evaluation methodology for software based leak detection systems
- API 1149 – Pipeline variable uncertainties & their effects on leak detectability

Regulation

An underground petroleum pipeline running through a park
In the US, pipelines are regulated by the Pipeline and Hazardous Materials Safety Administration (PHMSA). Offshore pipelines are regulated by the Minerals Management Service (MMS). In Canada, pipelines are regulated by either the provincial regulators or, if they cross provincial boundaries or the Canada/US border, by the National Energy Board (NEB). Government regulations in Canada and the United States require that buried fuel pipelines must be protected from corrosion. Often, the most economical method of corrosion control is by use of pipeline coating in conjunction with cathodic protection and technology to monitor the pipeline. Above ground, cathodic protection is not an option. The coating is the only external protection.

Pipelines and geopolitics

Natural gas pipelines from Russia to the European Union, 2006
Pipelines for major energy resources (petroleum and natural gas) are not merely an element of trade. They connect to issues of geopolitics and international security as well, and the construction, placement, and control of oil and gas pipelines often figure prominently in state interests and actions. The most striking example of pipeline politics occurred at the beginning of the year 2009, wherein a dispute between Russia and Ukraine ostensibly over pricing led to a major political crisis. Russian state-owned gas company Gazprom cut off natural gas supplies to Ukraine after talks between it and the Ukrainian government fell through, but it was evident to observers that the real dispute lay in Ukraine's bid to join NATO, to the displeasure of Russian Prime Minister Vladimir Putin.
Oil and gas pipelines also figure prominently in the politics of Central Asia and the Caucasus.

Dangers

Accidents
Pipelines conveying flammable or explosive material, such as natural gas or oil, pose special safety concerns.
For a more complete list see Pipeline accidents
1982 - One of the largest non-nuclear explosions in history occurred along the Trans-Siberian Pipeline in the former Soviet Union. It has been alleged that the explosion was the result of CIA sabotage of the Trans-Siberian Pipeline.
June 4, 1989 - sparks from two passing trains detonated gas leaking from an LPG pipeline near Ufa, Russia. Up to 645 people were reported killed.
October 17, 1998 - at Jesse in the Niger Delta in Nigeria, a petroleum pipeline exploded killing about 1,200 villagers, some of whom were scavenging gasoline - the worst of several similar incidents in this country.
June 10, 1999 - a pipeline rupture in a Bellingham, Washington park led to the release of 277,200 gallons of gasoline. The gasoline was ignited, causing an explosion that killed two children and one adult.
August 19, 2000 - natural gas pipeline rupture and fire near Carlsbad, New Mexico this explosion and fire killed 12 members of the same family. The cause was due to severe internal corrosion of the pipeline.
July 30, 2004 - a major natural gas pipeline exploded in Ghislenghien, Belgium near Ath (thirty kilometres southwest of Brussels), killing at least 23 people and leaving 122 wounded, some critically. (CNN) (Expatica)
May 12, 2006 - an oil pipeline ruptured outside Lagos, Nigeria. Up to 200 people may have been killed. See Nigeria oil blast.
November 1, 2007 - a propane pipeline exploded near Carmichael, Mississippi, about 30 miles (48 km) south of Meridian, Mississippi. Two people were killed instantly and an additional four were injured. Several homes were destroyed and sixty families were displaced. The pipeline is owned by Enterprise Products Partners LP, and runs from Mont Belvieu, Texas, to Apex, North Carolina, according to an Enterprise spokesman.

As targets
Pipelines can be the target of vandalism, sabotage, or even terrorist attacks. In war, pipelines are often the target of military attacks, as destruction of pipelines can seriously disrupt enemy logistics

epoxy glass fabric


ice-flower upholstery fabric


dacron filter cloth


wax printing fabric


embroidered silk cloth


dazzle polyester fabric


coated abrasive cloth


textured taffetta fabric


Heat Transfer Printed


knitted terry cloth


coating waterproof cloth


computer knitting fabric


dutch wire cloth


cotton tencel fabric


high density velour


chenille throw fabric


wool knitted fabric


battenberg lace fabric


600d coated fabric


nylon cotton printed


Wholesale Nomex Fabric