The two ships seen here seem almost to be touching the walls of the Miraflores Locks. Miraflores is the name of one of the three locks that form part of the Panama Canal and the name of the small lake that separates these locks from the Pedro Miguel

Ships classified as "Panamax" are of the maximum dimensions that will fit through the locks of the Panama Canal. A lock is a device for raising and lowering boats between stretches of water of different levels on river and canal Waterways. The Panama Canal is a man-made Canal in Panama which joins the This size is determined by the dimensions of the lock chambers, and the depth of the water in the canal. Panamax is a significant factor in the design of cargo ships, with many ships being built to exactly the maximum allowable size.

Dimensions

Panamax is determined principally by the dimensions of the canal's lock chambers, each of which is 33. The Panama Canal Locks, which lift ships up 259 m (85 ft to the main elevation of the Panama Canal 53 metres (110 ft) wide by 320. The metre or meter is a unit of Length. It is the basic unit of Length in the Metric system and in the International A foot (plural feet or foot; symbol or abbreviation ft or sometimes &prime – the prime symbol) is a non-SI unit 0 metres (1050 ft) long, and 25. 9 metres (85 ft) deep. The usable length of each lock chamber is 304. 8 metres (1000 ft). The available water depth in the lock chambers varies, but the shallowest depth is at the south sill of the Pedro Miguel Locks and is 12. 55 metres (41. 2 ft) at a Miraflores Lake level of 16. 61 metres (54 feet 6 in). The height of the Bridge of the Americas at Balboa is the limiting factor on a vessel's overall height. The Bridge of the Americas ( Spanish: Puente de las Américas; originally known as the Thatcher Ferry Bridge) is a road bridge in Panama, Balboa is a district of Panama City, located at the Pacific entrance to the Panama Canal.

USS Missouri (BB-63), one of the Iowa class battleships, makes a very tight fit as she passes through the Miraflores Locks of the Panama Canal in October 1945. Construction See also Iowa class battleship, Armament of the Iowa class battleship Missouri was one of the ''Iowa''-class " History The Iowa -class battleships were shaped by the Battle of Jutland, by naval treaties signed by various countries during the 1920s and 1930s and by the The Panama Canal is a man-made Canal in Panama which joins the Year 1945 ( MCMXLV) was a Common year starting on Monday (link will display the full calendar

The maximum dimensions allowed for a ship transiting the canal are:^[1]

• Length: 294. 1 metres (965 ft)

• Beam (width): 32. The beam of a ship is its width at the widest point or at the mid-point of its length 3 metres (106 ft)

• Draft: 12. The draft (or draught) of a ship's hull is the vertical distance between the Waterline and the bottom of the hull ( Keel) with the thickness 0 metres (39. 5 ft) in tropical fresh water (the salinity and temperature of water affect its density, and hence how deeply a ship will sit in the water)

• Air draft: 57. 91 metres (190 ft) measured from the waterline to the vessel's highest point

A Panamax cargo ship would typically have a displacement of around 65,000 tons. Tonnage is a measure of the size or Cargo capacity of a Ship. ^[2]

Exceptions

Vessels up to 62. 5 metres (205 ft) in height may pass by prior approval, co-ordinated with low tide at the Bridge of the Americas. The Bridge of the Americas ( Spanish: Puente de las Américas; originally known as the Thatcher Ferry Bridge) is a road bridge in Panama,

On an exceptional basis, vessels up to 32. 61 metres (107 ft) in beam may be permitted to transit, subject to additional draft constraints.

Vessels with structures extending beyond the maximum length and/or beam above the level of the lock walls may be permitted transit subject to inspection and approval.

During an exceptionally dry season, when the water level in Lake Gatún is low, the maximum permitted draft may be reduced. Gatun Lake (Sp Lago Gatún) is a large Artificial lake situated in the Republic of Panama; it forms a major part of the Panama Canal, carrying

The longest ship ever to transit was the San Juan Prospector, now Marcona Prospector, an ore-bulk-oil carrier that is 296. An Ore-bulk-oil carrier, also known as combination carrier or OBO, is a Ship designed to be capable of carrying wet or dry Cargoes The idea is 57 metres (973 ft) long, with a beam of 32. 3 metres (106 ft). ^[3] The widest ships to transit are the two North Carolina class battleships, USS North Carolina (BB-55) and USS Washington (BB-56), which have beams of 33. Design Before this class the United States Navy favored staying power and fire power over speed Construction and shakedown She was laid down 27 October 1937 at the New York Naval Shipyard and launched on 13 June 1940 sponsored by Isabel Hoey (daughter Service in the Atlantic March – July 1942 Her shakedown and underway training ranged along the eastern seaboard and into the Gulf of Mexico and lasted through American 025 metres (108 ft 3. 875 inches). ^[4]

Impact on shipping

An officer monitors the clearance of the cruise ship Ryndam as she traverses the lock.

Panamax continues to be a noteworthy factor in ship design, with an increasing number of ships being built precisely to the Panamax limit, in order to transport the maximum amount of cargo in a single vessel.

Much bulk merchandise, such as grain products, is moved primarily on Panamax (or sub-Panamax) ships.

The increasing prevalence of vessels of the maximum size is a problem for the canal. A Panamax ship is a tight fit that requires precise control of the vessel in the locks, possibly resulting in longer lock time, and requiring that these ships be transited in daylight. Because the largest ships cannot pass safely within the Gaillard Cut, the canal effectively operates an alternating one-way system for these ships. The Gaillard Cut, or Culebra Cut, is a man-made valley cutting through the Continental divide in Panama.

Post-Panamax Ships

Panamax container ship transiting the Panama Canal. Container ships are Cargo ships that carry all of their load in truck-size containers in a technique called Containerization. Some containers have been offloaded and are transported by the Panama Railway over the isthmus to allow acceptable draft. The Panama Railway or Panama Rail Road is a Railway line that links the Atlantic Ocean to the Pacific Ocean across Panama in

Post-Panamax or over-Panamax are the terms used to describe ships larger than Panamax that do not fit in the current canal.

Many modern ships are far larger than canal limits and cannot use the canal. This is the case for supertankers and the largest modern container ships. History The technology of oil transportation has evolved alongside the oil industry Containerization (or containerisation) is a system of Intermodal freight transport Cargo Transport using standard ISO containers U.S. Navy supercarriers are also in the post-Panamax class; the Nimitz class aircraft carriers are 333 metres (1092 ft) long overall with a beam of 41 metres (134 ft), while the flight deck is 76. This is about the warships For the television program see Supercarrier (TV series. General characteristics Builder Newport News Shipbuilding Company Newport News Virginia Power Plant Two A4W reactors 8 metres (252 ft) wide.

Expansion

As early as the 1930s, new locks were proposed for the Panama Canal to ease congestion and to allow larger ships to pass. The 1930s were described as an abrupt shift to more radical and conservative lifestyles as countries were struggling to find a solution to the Great Depression. The history of the Panama Canal goes back almost to the earliest explorers of the Americas.

On October 22, 2006, the Panama Canal Authority (with the support of the Electoral Tribunal) held a referendum for Panamanian citizens to vote on the Panama Canal expansion project. Events 202 BC - Hannibal Barca, leader of the Carthaginians, is defeated by the Roman legions under Scipio Africanus Year 2006 ( MMVI) was a Common year starting on Sunday of the Gregorian calendar. The Panama Canal Authority ( Spanish: Autoridad del Canal de Panamá, or ACP) is the agency of the government of Panama responsible for the operation A referendum (plural referendums or referenda) ballot question, or plebiscite (from Latin plebiscita The Panama Canal Expansion, or--> Third Set of Locks Project is a Megaproject that will expand the Panama Canal. The expansion was approved by a wide margin, with support from about 78% of the electorate. The Panama Canal expansion referendum was held on October 22, 2006, when the citizens of Panama approved the Panama Canal expansion It is estimated that this expansion will be completed by 2014. The projected cost is $5. 3 billion; this sum is expected to be recovered within 11 years.

After expansion, the Panama Canal is expected to be able to handle vessels up to 12000 twenty-foot equivalent units (TEU) in size; currently, it can only handle vessels up to about 5000 TEU. Twenty-foot Equivalent Unit (often TEU or teu) is an inexact unit of cargo capacity often used to describe the capacity of Container ships and Container A third set of locks - 427 meters (1,400 feet) long, 55 meters (180 feet) wide, with a draft of 18. 3 meters (60 feet) - will supplement the two existing sets of locks.

Comparison of sizes

See also

Panamax ship transiting the Panama canal. Note how the hull construction, meant to maximize cargo capacity, also allows the ship to narrowly pass through the canal.

• Capesize
• Seawaymax
• Handymax
• Handysize
• Aframax
• Suezmax
• Malaccamax
• VLCC
• ULCC
• Liberty ship - 10,000 tons
• Panama Canal expansion project
• List of deep water ports

References

1. ^ Vessel Requirements, from the Panama Canal Authority
2. ^ Modern ship size definitions, from Lloyd's register
3. ^ Background of the Panama Canal, Montclair State University
4. ^ Battleships, United States Battleships in World War II, by Robert O. Capesize ships are Cargo ships originally too large to transit the Suez Canal (i term Seawaymax refers to vessels which are the maximum size that can fit through the Canal locks of the St Handymax or Supramax is a Naval architecture term for a Bulk carrier, typically between 35000 and. Although there is no official definition in terms of exact tonnages Handysize most usually refers to a dry bulk vessel (or less commonly to a product tanker An Aframax ship is an oil tanker with capacity between and. Aframax class tankers are largely used in the basins of the Black Sea, the North Sea, the Suezmax is a Naval architecture term for the largest ships capable of transiting the Suez Canal fully loaded and is almost exclusively used in reference to Malaccamax is a Naval architecture term for the largest size of ship capable of fitting through the -deep Strait of Malacca. History The technology of oil transportation has evolved alongside the oil industry History The technology of oil transportation has evolved alongside the oil industry History and service In 1936 the American Merchant Marine Act was passed to subsidize the annual construction of 50 commercial merchant vessels to be used in wartime by The Panama Canal Expansion, or--> Third Set of Locks Project is a Megaproject that will expand the Panama Canal. A deep water port is any port that can accommodate a fully laden Panamax ship The Panama Canal Authority ( Spanish: Autoridad del Canal de Panamá, or ACP) is the agency of the government of Panama responsible for the operation Dulin, Jr. and William H. Garzke, Jr. ; pages 62 and 145. Naval Institute Press, 1976. ISBN 0-87021-099-8

External links

• Vessel size groups