A passenger ship is a merchant ship whose primary function is to carry passengers on the sea. The category does not include cargo vessels which have accommodations for limited numbers of passengers, such as the ubiquitous twelve-passenger freighters once common on the seas in which the transport of passengers is secondary to the carriage of freight. The type does however include many classes of ships designed to transport substantial numbers of passengers as well as freight. Indeed, until recently virtually all ocean liners were able to transport mail, package freight and express, and other cargo in addition to passenger luggage, and were equipped with cargo holds and derricks, kingposts, or other cargo-handling gear for that purpose. Only in more recent ocean liners and in virtually all cruise ships has this cargo capacity been eliminated.
20-750: SS Canopic was a passenger liner of the White Star Line . The ship was built by Harland & Wolff in Belfast for the Dominion Line , and launched on 31 May 1900 as the Commonwealth . The 12,268 GRT ship was 578 feet (176 m) long, and powered by a 988 nhp 6-cylinder triple expansion steam engine which gave her a service speed of 16 knots (30 km/h; 18 mph). She could carry up to 1,300 passengers. The ship initially operated between Liverpool and Boston, but in 1903 she
40-487: A given hull size. Passenger ships are subject to two major International Maritime Organization requirements : to perform musters of the passengers (...) within 24 hours after their embarkation and to be able to perform full abandonment within a period of 30 minutes from the time the abandon-ship signal is given . Transportation Research Board research from 2019 reported passenger vessels, much more than freight vessels, are subject to degradations in stability as
60-408: A result of increases in lightship weight. Passenger vessels appear to be more pressing candidates for lightship weight-tracking programs than freight vessels. Passengers on ships without backup generators suffer substantial distress due to lack of water, refrigeration, and sewage systems in the event of loss of the main engines or generators due to fire or other emergency. Power is also unavailable to
80-806: A ship is its weight . As the term indicates, it is measured indirectly, using Archimedes' principle , by first calculating the volume of water displaced by the ship, then converting that value into weight. Traditionally, various measurement rules have been in use, giving various measures in long tons . Today, tonnes are more commonly used. Ship displacement varies by a vessel's degree of load, from its empty weight as designed (known as "lightweight tonnage" ) to its maximum load. Numerous specific terms are used to describe varying levels of load and trim, detailed below. Ship displacement should not be confused with measurements of volume or capacity typically used for commercial vessels and measured by tonnage : net tonnage and gross tonnage . The process of determining
100-502: A ship's GRT and displacement were somewhat similar in number. For example, Titanic , put in service in 1912, had a GRT of 46,328 and a displacement reported at over 52,000 tons. Similarly, Cunard Line's mid-1930s RMS Queen Mary and RMS Queen Elizabeth were of approximately 81,000 – 83,000 GRT and had displacements of over 80,000 tons. Today, due to changes in construction, engineering, function, architecture, and, crucially, measurement system – which measures functionally all of
120-526: A ship's internal volume, not just part of it – modern passenger ships' GT values are much higher than their displacements. The Cunard Queens' current successor, the 148,528 GT Queen Mary 2 , has been estimated to only displace approximately 76,000 tons. With the completion in 2009 of the first of the over 225,000 GT Oasis -class cruise ships, Oasis of the Seas , passenger ships' displacements rose to 100,000 tons, well less than half their GT. This new class
140-427: A vessel's displacement begins with measuring its draft . This is accomplished by means of its "draft marks". A merchant vessel has three matching sets: one mark each on the port and starboard sides forward, midships, and astern. These marks allow a ship's displacement to be determined to an accuracy of 0.5%. The draft observed at each set of marks is averaged to find a mean draft. The ship's hydrostatic tables show
160-408: Is calculated based on "the moulded volume of all enclosed spaces of the ship", and is used to determine things such as a ship's manning regulations, safety rules, registration fees, and port dues. It is produced by a mathematical formula, and does not distinguish between mechanical and passenger spaces, and thus is not directly comparable to historic GRT measurements. Displacement , a measure of mass,
180-425: Is characteristic of an explosive growth in gross tonnage, which has more than doubled from the largest cruise ships of the late 1990s. This reflects the much lower relative weight of enclosed space in the comparatively light superstructure of a ship versus its heavily reinforced and machinery-laden hull space, as cruise ships have grown slab-sided vertically from their maximum beam to accommodate more passengers within
200-507: Is not commonly used for passenger vessels. While a high displacement can indicate better sea keeping abilities, gross tonnage is promoted as the most important measure of size for passenger vessels, as the ratio of gross tonnage per passenger – the Passenger/Space Ratio – gives a sense of the spaciousness of a ship, an important consideration in cruise liners where the onboard amenities are of high importance. Historically,
220-674: The Atlantic Ocean between Europe and the United States or travel even further to South America or Asia while cruise ships typically serve shorter routes with more stops along coastlines or among various islands. Both the Queen Elizabeth 2 ( QE2 ) (1969) and her successor as Cunard's flagship RMS Queen Mary 2 ( QM2 ), which entered service in 2004, are of hybrid construction. Like transatlantic ocean liners, they are fast ships and strongly built to withstand
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#1732772304014240-560: The International Convention for the Safety of Life at Sea (SOLAS) requires passenger ships operating in international waters must either be constructed or upgraded to exclude combustible materials. It is believed some owners and operators of ships built before 1980, which are required to upgrade or retire their vessels, will be unable to conform to the regulations. Fred. Olsen Cruise Line 's Black Prince , built in 1966
260-943: The Liverpool–Montreal route until 1925, when she was scrapped at Briton Ferry , Wales. Timber panelling from the dining hall was salvaged and installed in the former Canopic Restaurant at Mumbles from where it was later reinstalled in the town's White Rose hotel. Passenger liner While typically passenger ships are part of the merchant marine , passenger ships have also been used as troopships and often are commissioned as naval ships when used as for that purpose. Passenger Ship Types: Passenger ships include ferries , which are vessels for day to day or overnight short-sea trips moving passengers and vehicles (whether road or rail); ocean liners , which typically are passenger or passenger-cargo vessels transporting passengers and often cargo on longer line voyages; and cruise ships , which often transport passengers on round-trips, in which
280-493: The Seas in October 2009. Because of changes in historic measurement systems, it is difficult to make meaningful and accurate comparisons of ship sizes. Historically, gross register tonnage (GRT) was a measure of the internal volume of certain enclosed areas of a ship divided into "tons" equivalent to 100 cubic feet (2.8 m ) of space. Gross tonnage (GT) is a comparatively new measure, adopted in 1982 to replace GRT. It
300-420: The corresponding volume displaced. To calculate the weight of the displaced water, it is necessary to know its density. Seawater (1,025 kg/m ) is more dense than fresh water (1,000 kg/m ); so a ship will ride higher in salt water than in fresh. The density of water also varies with temperature. Devices akin to slide rules have been available since the 1950s to aid in these calculations. Presently, it
320-472: The crew of the ship to operate electrically powered mechanisms. Lack of an adequate backup system to propel the ship can, in rough seas, render it dead in the water and result in loss of the ship. The 2006 Revised Passenger Ship Safety Standards address these issues, and others, requiring that ships ordered after July, 2010 conform to safe return to port regulations; however, as of 2013 many ships remain in service which lack this capacity. After October 1, 2010,
340-641: The rigors of the North Atlantic in line voyage service, but both ships are also designed to operate as cruise ships, with the amenities expected in that trade. QM2 was superseded by the Freedom of the Seas of the Royal Caribbean line as the largest passenger ship ever built; however, QM2 still hold the record for the largest ocean liner. The Freedom of the Seas was superseded by the Oasis of
360-508: The trip itself and the attractions of the ship and ports visited are the principal draw. There are several main types: Although some ships have characteristics of both types, the design priorities of the two forms are different: ocean liners value speed and traditional luxury while cruise ships value amenities (swimming pools, theaters, ball rooms, casinos, sports facilities, etc.) rather than speed. These priorities produce different designs. In addition, ocean liners typically were built to cross
380-586: Was one such ship, but was reported to be headed for inter-island service in Venezuelan waters. The International Ice Patrol was formed in 1914 after the sinking of the Titanic to address the long-outstanding issue of iceberg collision. Passengers and their luggage at sea are covered by the Athens Convention . Displacement (ship) The displacement or displacement tonnage of
400-557: Was transferred to the White Star Line and renamed Canopic . Her first crossing for the White Star Line began on 14 January 1904, on which she sailed from Liverpool to Boston. Immediately after this first crossing, she joined the Romanic and Republic on the White Star Line's new Mediterranean service, on which she would remain for more than 13 years. She was requisitioned for war service between 1917 and 1919, then served on
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