Lightering

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Lightering (also called lighterage) is the process of transferring cargo between vessels of different sizes, usually between a barge (lighter) and a bulker or oil tanker. Lightering is undertaken to reduce a vessel's draft so it can enter port facilities that cannot accept large fully-loaded ocean-going vessels. Lightering can also refer to the use of a lighter barge for any form of short-distance transport, such as to bring railroad cars across a river. [1] [2] In addition, lightering can refer to the process of removing oil or other hazardous chemicals from a compromised vessel to another vessel to prevent an oil spill. [3]

Contents

History

In May 1935, Pan American Airways (PAA) construction workers use a barge to lighter building materials from the SS North Haven to the dock at Wilkes Island, Wake Atoll. SS North Haven unloading at Wilkes Island, Wake Atoll.jpg
In May 1935, Pan American Airways (PAA) construction workers use a barge to lighter building materials from the SS North Haven to the dock at Wilkes Island, Wake Atoll.

Lightering was practiced for all types of cargo for centuries. Prior to the 19th century introduction of steamships too large to enter some of the ports they intended to serve, in which case lightering became necessary to reduce the vessels' draft sufficiently to enter the port, cargoes ranging from water to ships' stores (food, livestock, misc. supplies), to gunpowder and shot, were carried from dockside to sailing ships moored in harbors and roadways. Dredging, advances in dock construction, and containerization have reduced the frequency of the practice in dry bulk shipping since the middle of the 20th century. However, the practice remains in common usage in the oil tanking industry ("wet" cargo trade).

Modern process

Wet bulk

Lightering for tankers typically occurs in the EEZ, generally between 20 nautical miles (40 km) and 60 nautical miles (110 km) from the shore, and can be performed while the ships are at anchor, drifting, or underway. The product is typically transferred using specialized hoses which offload cargo from the larger vessel to the smaller. Fenders are used to separate the two ships moored to each other and prevent damage while the cargo is being transferred.

Dry bulk

In many developing nations, such as China and especially India, dry bulk vessels still often lighter so they can meet draft restrictions at ports with no natural deep water access or without channels dredged to sufficient depth to allow safe transit.

In dry bulk, lightering can be undertaken one of two ways. If the vessel to be lightered is geared, then it can discharge cargo to smaller, ungeared vessels (typically barges). If the vessel to be lightered is gearless, then floating cranes are often used to transfer cargo to another vessel or barge. A roll-on/roll-off discharge facility, a floating platform, can also be used to connect the vessels.

Also, though not very common, vessels will sometimes lighter before (or even between) berthings, shifting to shallower berths to discharge more quickly and free up space for larger vessels.

See also

Related Research Articles

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Ship Large watercraft

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<span class="mw-page-title-main">Maritime transport</span> Transport of people or goods via waterways

Maritime transport or more generally waterborne transport, is the transport of people (passengers) or goods (cargo) via waterways. Freight transport by sea has been widely used throughout recorded history. The advent of aviation has diminished the importance of sea travel for passengers, though it is still popular for short trips and pleasure cruises. Transport by water is cheaper than transport by air or ground, but significantly slower for longer distances. Maritime transport accounts for roughly 80% of international trade, according to UNCTAD in 2020.

<span class="mw-page-title-main">Port</span> Maritime facility where ships may dock to load and discharge passengers and cargo

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<span class="mw-page-title-main">Cargo ship</span> Ship or vessel that carries goods and materials

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<span class="mw-page-title-main">Merchant ship</span> Civilian boat or ship that transports cargo or carries passengers for hire

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<span class="mw-page-title-main">Lighter aboard ship</span>

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<span class="mw-page-title-main">Oil terminal</span> Industrial facility for the storage of oil, petroleum and petrochemical products

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Oil tanker Ship that carries oil

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<span class="mw-page-title-main">Breakbulk cargo</span> Shipping goods that are loaded individually

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<span class="mw-page-title-main">Ship-to-ship cargo transfer</span>

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<span class="mw-page-title-main">Type B ship</span>

The Type B ship is a United States Maritime Administration (MARAD) designation for World War II barges. Barges are very low cost to build, operate and move. Barges were needed to move large bulky cargo. A tug boat, some classed as Type V ships, could move a barge, then depart and move on to the next task. That meant the barge did not have to be rushed to be unloaded or loaded. Toward the end of World War 2, some ships that had not been completed in time for the war were converted to barges. US Navy barges are given the prefix: YWN or YW. Due to shortage of steel during World War II, concrete ship constructors were given contracts to build concrete barges, with ferrocement and given the prefix YO, YOG, YOGN. Built in 1944 and 1945, some were named after elements.

India Arrow was a steam tanker built in 1921 by Bethlehem Shipbuilding Corporation of Quincy for Standard Oil Co., with intention of transporting oil and petroleum products between the United States and the Far East. During the first eight years the tanker was chiefly employed in the Pacific trade, carrying cargo between Gulf ports and a variety of destinations in East Asia. In late 1920s the tanker was moved to serve intercoastal trade routes while still making occasional trips to Asia. In early 1930s she was permanently assigned to trade routes between the Gulf and the ports on the United States East Coast, where she remained for the rest of her career.

References

  1. "lighterage". Dictionary.com.
  2. Glanz, James; Lipton, Eric (2003). City in the Sky: The Rise and Fall of the World Trade Center. Henry Holt and Company. ISBN   0-8050-7428-7.
  3. "What is lightering?". U.S. National Oceanic and Atmospheric Administration (NOAA) National Ocean Service.