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A reefer ship is a refrigerated cargo ship, typically used to transport perishable commodities which require temperature-controlled transportation, such as fruit, meat, fish, vegetables, dairy products and other foods.
Types of reefers: Reefer ships may be categorised into three types:
- Side-door vessels have water-tight ports on the ship's hull, which open into a cargo hold. Elevators or ramps leading from the quay serve as loading and discharging access for the forklifts or conveyors. Inside these access ports or side doors, pallet lifts or another series of conveyors bring the cargo to the respective decks. This special design makes the vessels particularly well suited for inclement weather operations as the tops of the cargo holds are always closed against rain and sun.
- Conventional vessels have a traditional cargo operation with top opening hatches and cranes/derricks. On such ships, when facing wet weather, the hatches need to be closed to prevent heavy rain from flooding the holds. Both above ship types are well suited for the handling of palletized and loose cargo.
- Refrigerated container ships are specifically designed to carry containerised unit loads where each container has its individual refrigerated unit. These containers are nearly always twenty-foot equivalent units (often called TEU) that are the size of "standard" cargo containers that are loaded and unloaded at container terminals and aboard container ships. These ships differ from conventional container ships in their design, power generation, and electrical distribution equipment. They need provisions made for powering each container's cooling system. Because of their ease of loading and unloading cargo many container ships are now being built or redesigned to carry refrigerated containers.
A major use of refrigerated cargo hold type ships was for the transportation of bananas and frozen meat, but most of these ships have been partly replaced by refrigerated containers that have a refrigeration system attached to the rear end of the container. While on a ship these containers are plugged into an electrical outlet (typically 440 VAC) that ties into the ship's power generation. Refrigerated container ships are not limited by the number of refrigeration containers they can carry, unlike other container ships which may be limited in their number of refrigeration outlets or have insufficient generator capacity. Each reefer container unit is typically designed with a stand-alone electrical circuit and has its own breaker switch that allows it to be connected and disconnected as required. In principle each individual unit could be repaired while the ship was still underway.
Refrigerated cargo is a key part of the income for some shipping companies. On multi-purpose ships, refrigerated containers are mostly carried above deck, as they have to be checked for proper operation. Also, a major part of the refrigeration system (such as a compressor) may fail, which would have to be replaced or unplugged quickly in the event of a fire. Modern container vessels stow the reefer containers in cellguides with adjacent inspection walkways that enable reefer containers to be carried in the holds as well as on the deck. Modern refrigerated container vessels are designed to incorporate a water-cooling system for containers stowed under deck. This does not replace the refrigeration system but facilitates cooling down of the external machinery. Containers stowed on the exposed upper deck are air-cooled, while those under deck are water-cooled. The water cooling design allows capacity loads of refrigerated containers under deck as it enables the dissipation of the high amount of heat they generate. This system draws fresh water from the ship's water supply, which in turn transfers the heat through heat exchangers to the abundantly available sea water.
There are also refrigeration systems that have two compressors for very precise and low-temperature operations, such as transporting a container of blood to a war zone. Cargoes of shrimp, asparagus, caviar and blood are considered among the most expensive refrigerated items. Bananas, fruit and meat have historically been the main cargo of refrigerated ships.
Primary maritime cargo types
|Primary Maritime Cargo Types|
|Break bulk cargo or General cargo||Countable||Yes||No||In shipping, break bulk cargo or general cargo are goods that must be loaded individually, and not in intermodal containers nor in bulk as with oil or grain. Ships that carry this sort of cargo are called general cargo ships. The term break bulk derives from the phrase breaking bulk—the extraction of a portion of the cargo of a ship or the beginning of the unloading process from the ship's holds. These goods may not be in shipping containers. Break bulk cargo is transported in bags, boxes, crates, drums, or barrels. Unit loads of items secured to a pallet or skid are also used.|
|Bulk cargo (Bulk dry cargo)||Weighable||No||No||Bulk cargo is commodity cargo that is transported unpackaged in large quantities. It refers to material in either liquid or granular, particulate form, as a mass of relatively small solids, such as petroleum/crude oil, grain, coal, or gravel. This cargo is usually dropped or poured, with a spout or shovel bucket, into a bulk carrier ship's hold, railroad car/railway wagon, or tanker truck/trailer/semi-trailer body. Smaller quantities (still considered "bulk") can be boxed (or drummed) and palletised. Bulk cargo is classified as liquid or dry.|
|Bulk liquid cargo||Weighable||No||No||A tanker (or tank ship or tankship) is a ship designed to transport or store liquids or gases in bulk. Major types of tankship include the oil tanker, the chemical tanker, and gas carrier. Tankers also carry commodities such as vegetable oils, molasses and wine. In the United States Navy and Military Sealift Command, a tanker used to refuel other ships is called an oiler (or replenishment oiler if it can also supply dry stores) but many other navies use the terms tanker and replenishment tanker. A wide range of products are carried by tankers, including:|
|Container Cargo||Countable||Yes||Yes||Containerization is a system of intermodal freight transport using intermodal containers (also called shipping containers and ISO containers). The containers have standardized dimensions. They can be loaded and unloaded, stacked, transported efficiently over long distances, and transferred from one mode of transport to another—container ships, rail transport flatcars, and semi-trailer trucks—without being opened. The handling system is completely mechanized so that all handling is done with cranes  and special forklift trucks. All containers are numbered and tracked using computerized systems.|
|Neo-bulk cargo||Weighable||Yes||No||In the ocean shipping trade, neo-bulk cargo is a type of cargo that is a subcategory of general cargo, alongside the other subcategories of break-bulk cargo and containerized cargo. (Gerhardt Muller, erstwhile professor at the United States Merchant Marine Academy and Manager of Regional Intermodal Planning of the Port Authority of New York and New Jersey, promotes it from a subcategory to being a third major category of cargo in its own right, alongside general and bulk cargo.) It comprises goods that are prepackaged, counted as they are loaded and unloaded (as opposed to bulk cargo where individual items are not counted), not stored in containers, and transferred as units at port. Types of neo-bulk cargo goods include heavy machinery, lumber, bundled steel, scrap iron, bananas, waste paper, and cars. The category has only become recognized as a distinct cargo category in its own right in recent decades.|
|Passenger Cargo||Countable||No||No||A passenger ship is a merchant ship whose primary function is to carry passengers on the sea.|
|Project cargo||Weighable||Yes||No||Project cargo is a term used to broadly describe the national or international transportation of large, heavy, high value or a critical (to the project they are intended for) pieces of equipment. Also commonly referred to as Heavy lift, this includes shipments made of various components which need disassembly for shipment and reassembly after delivery.|
|Refrigerated Cargo||Weighable||Yes||Yes / no||A reefer ship is a refrigerated cargo ship, typically used to transport perishable commodities which require temperature-controlled transportation, such as fruit, meat, fish, vegetables, dairy products and other foods.|
|Roll-on/roll-off Cargo||Countable||No||No||Roll-on/roll-off (RORO or ro-ro) ships are vessels designed to carry wheeled cargo, such as cars, trucks, semi-trailer trucks, trailers, and railroad cars, that are driven on and off the ship on their own wheels or using a platform vehicle, such as a self-propelled modular transporter. This is in contrast to lift-on/lift-off (LoLo) vessels, which use a crane to load and unload cargo.|
History of ship refrigeration
By 1869, reefers were shipping beef carcasses frozen in a salt-ice mixture from Indianola, Texas, to New Orleans, Louisiana, to be served in hospitals, hotels and restaurants. By 1874 they were shipping frozen beef from America to London, which developed into an annual tonnage of around 10,000 short tons (8,900 long tons; 9,100 t). The insulated cargo space was cooled by ice, which was loaded on departure. The success of this method was limited by insulation, loading techniques, ice block size, distance and climate.
The first attempt to ship refrigerated meat was made when the Northam sailed from Australia to the UK in 1876. The refrigeration machinery broke down en route and the cargo was lost. In 1877, the steamers Frigorifique and Paraguay carried frozen mutton from Argentina to France, proving the concept of refrigerated ships, if not the economics. In 1879 Strathleven, equipped with compression refrigeration, sailed successfully from Sydney to the UK with 40 tons of frozen beef and mutton as a small part of her cargo.
The clipper sailing ship Dunedin, owned by the New Zealand and Australian Land Company (NZALC), was refitted in 1881 with a Bell-Coleman compression refrigeration machine. This steam-powered freezer unit worked by compressing air, then releasing it into the hold of the ship. The expanding air absorbed heat as it expanded, cooling the cargo in the hold. Using three tons of coal a day, this steam powered machine could chill the hold to 40 °F (22 °C) below the surrounding air temperature, freezing the cargo in the temperate climate of southern New Zealand, and then maintaining it below freezing (32 °F, 0 °C) through the tropics. Dunedin's most visible sign of being an unusual ship was the funnel for the refrigeration plant placed between her fore and main masts (sometimes leading her to be mistaken for a steamship which had been common since the 1840s). In February 1882, Dunedin sailed from Port Chalmers New Zealand with 4,331 mutton, 598 lamb and 22 pig carcasses, 246 kegs of butter, and hare, pheasant, turkey, chicken and 2,226 sheep tongues and arrived in London after sailing 98 days with its cargo still frozen. After meeting all costs, the NZALC company made a £4,700 profit from the voyage.
Soon after Dunedin's successful voyage, an extensive frozen meat trade from New Zealand and Australia to the UK was developed with over 16 different refrigerated and passenger refrigerated ships built or refitted by 1900 in Scotland and Northern England shipyards for this trade. Within 5 years, 172 shipments of frozen meat were sent from New Zealand to the United Kingdom. Refrigerated shipping also led to a broader meat and dairy boom in Australia, New Zealand and Argentina. Frozen meat and dairy exports continued to form the backbone of New Zealand's. As of 2012, New Zealand has no refrigerated cargo ships.
The Nelson brothers, butchers in County Meath, Ireland, started shipping extensive live beef shipments to Liverpool, England. They successfully expanded their beef business until their imports from Ireland were insufficient to supply their rapidly growing business and Nelson decided to investigate the possibility of importing meat from Argentina. The first refrigerated ship they bought was Spindrift which they renamed in 1890 SS Highland Scot. A vessel of 3,060 gross tons bought by James Nelson and Sons in 1889 and fitted with a somewhat primitive refrigerating plant operating on the cold air system became one of the pioneer vessels in the trade of refrigerated meat and other perishable commodities. They hauled beef carcasses from Argentina to Britain. Their regularly scheduled shipments and ships developed into the Nelson Line that was formed in 1880 for the meat trade from Argentina to UK. Refrigeration made it possible to import meat from the United States, New Zealand, Argentina and Australia.
All of their ships had a "Highland" first name. The Nelson Line began passenger service in 1910 between London, England and Buenos Aires and in 1913 came under control of the Royal Mail Steam Packet Company. In 1932 Royal Mail Group collapsed, Royal Mail Lines Ltd was founded, and Nelson Line merged into the new company.
- In 1876, French engineer Charles Tellier bought the ex-Elder-Dempster 690 tons cargo ship Eboe and fitted a Methyl-ether refrigerating plant of his design. The ship was renamed Le Frigorifique and successfully imported a cargo of refrigerated meat from Argentina. However the machinery could be improved and in 1877 another refrigerated ship called Paraguay with a refrigerating plant improved by Ferdinand Carré was put into service on the South American run.
- In 1879, Henry Bell (1848–1931) and John Bell (1850–1929) of Scotland and Joseph James Coleman FRSE (1838–1888) of Scotland completed the Bell–Coleman dense-air machine on the Anchor liner Circassia, which successfully brought a cargo of chilled beef from the US to London.
- In 1880, Strathleven, equipped with a Bell–Coleman air machine and loaded with successfully shipped beef, mutton, butter and kegs, sailed from Melbourne, Australia to London—a nine-week voyage of about 15,000 miles (24,000 km).
- In 1881, Alfred Seale Haslam (1844–1927) of England equipped the liner Orient with Haslam refrigeration compressors. He bought the Bell–Coleman dense-air patents in 1878 and eventually equipped four hundred plants and ships with Bell-Coleman machines.
- By 1899, refrigerated fruit ship traffic to the US reached 90,000 tons per year.
- By 1890, after acquiring the patent rights of Franz Windhausen's CO2-compression refrigeration system, the J & E Hall company installed the first marine CO2 refrigerator system on the Nelson Line ship Highland Chief.
- In 1900, a worldwide survey found 356 refrigerated ships, 37% of which had air machines, 37% ammonia compressors and 25% CO2 compressors.
- In 1900, Great Britain[verification needed] imported over 360,000 metric tons of refrigerated meat: 220,000 tons from Argentina, 95,000 tons from New Zealand and 45,000 tons from Australia. There were weekly sailings on refrigerated "banana boats" from the UK to Central America by Elders and Fyffes Ltd, which had been importing bananas since 1888 to the UK in their own ships. Round trips took 28 days.
- In 1901, the first refrigerated banana ship, Port Morant, was equipped with a CO2 machine and carried 23,000 stems of bananas at a controlled temperature from Jamaica to the UK.
- In 1902, Lloyd's Register recorded 460 ships with refrigerating plants.
- By 1902, the United Fruit Company started having refrigerated banana boats built in the UK to add to their fleet which hauled passengers and bananas between ports in the United States and Central America.
- By 1910, UK refrigerated meat imports rose to 760,000 tons per year.
- By 1910, the British company J & E Hall had installed 1800 CO2 refrigeration machines in ships.
- By 1913, the UK fleet included 230 refrigerated ships with a total cargo capacity of 440,000 tons.
- By 1935, refrigerated imports into Britain totaled 1,000,000 metric tons (980,000 long tons; 1,100,000 short tons) of meat, 500,000 tons of butter, 130,000 tons of cheese, 430,000 tons of apples and pears, and 20 million stems of bananas.
United Fruit Company reefer ships
The United Fruit Company has used some type of reefers, often combined with cruise ship passenger accommodations, since about 1889. Because of their cargo was mostly bananas, they were nicknamed the "Banana Fleet". Since bananas are relatively light and the normal shipping route was to Central America and then back to various U.S. ports, these ships were often built as combination cargo ships and what are now called cruise ships to pay for more of their operating expenses. After about 1910, they called these combination cruise and cargo ships the "Great White Fleet". To avoid US shipping regulations and taxes they are registered in about six other countries, with very few now maintaining US registry. European associates with their own ships were often employed to ship fruit to Europe. United Brands was taken over by Chiquita Brands International in the 1980s and owns the largest fleet of banana boats in the world, but none of them now sails under the US flag. SS Pastores and SS Calamares were built in Ireland in 1912 and 1913 for the United Fruit Company as a combination cruise ship and refrigerated cargo ship. The United Fruit Company's fleet of about 85 ships was one of the largest civilian fleets in the world. These ships normally carried up to 95 cruise ship passengers and a crew to ports in Central America and then would return to the United States with passengers and a cargo of refrigerated bananas and miscellaneous cargo. They were part of United Fruit's "Great White Fleet"—to minimize heat build-up the ships were all painted white.
The renamed USS Pastores and USS Calamares were taken over by the United States Navy in World War I and used to take troops and refrigerated supplies to and from Europe. After hostilities ceased they were returned to United Fruit Company in 1919. They were requisitioned again on 2 June 1941 from United Fruit for use in World War II. After hostilities ceased they were then returned again to United Fruit Company in 1946.
World War I
In World War I, the US Navy contracted for 18 refrigerated ships for hauling provisions to the troops in Europe. They were launched 1918 and 1919 as the war was ending and were nearly all scrapped by 1933 in the Great Depression as an economy move. Most were built in Baltimore Dry Dock in Baltimore, Maryland, Moore SB in Oakland, California and Standard SB Co. in Shooter's Island, New York.
World War II
The Mizar-class stores ships were six United Fruit passenger and refrigerated cargo liners built in 1931–1933 that the United States Maritime Commission requisitioned in 1941–1942. They were USS Antigua, USS Ariel, USS Merak, USS Mizar, USS Talamanca and USS Tarazed. Antigua, although requisitioned, was never commissioned into the Navy. United States Maritime Commission Type R ship were Reefer ships.
NOTE: also requisitioned from the United Fruit Co. was SS Ulua; which became USS Octans. It was the last of the UFC 'reefer' ships to be taken over; which happened near the end of April 1943 in San Francisco.
In addition, the US Maritime Commission ordered 41 new refrigerated ships for the Navy. Because of the difficulty of building refrigerated ships only two were delivered in 1944. 26 were delivered in 1945 and the remainder in 1946–1948.
According to the CIA's The World Factbook, there were about 38,000 registered merchant ships in the world in 2010, of which about 920 were designed as refrigerated cargo ships. Because of the proliferation of self-contained refrigerated container systems on container ships, there are many more ships than those designed for only refrigerated cargo that are also carrying some refrigerated cargo. As of 2010, the countries with the largest numbers of reefer ships in their registries are the world's two most prominent flags of convenience: Panama with 212 and Liberia with 109.
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- Tolerton, Nick (2008). Reefer Ships: The Ocean Princesses. Christchurch, NZ: Willsonscott Publishing. ISBN 9781877427251.
|Wikimedia Commons has media related to Reefer ships.|
- Kohli, Pawanexh (2007). "Reefers". Reefer Ships – Maritime Information. Reefership Marine Services.
- ReeferTrends – a news and information service for the global refrigerated shipping trade
- Winchester, Clarence, ed. (1937), "Refrigerated Ships", Shipping Wonders of the World, pp. 553–556 illustrated description and survey of refrigerated ships.