The T2 tanker, or T2, was a class of oil tanker constructed and produced in large quantities in the United States during World War II. Only the T3 tankers were larger "navy oilers" of the period. Some 533 T2s were built between 1940 and the end of 1945. They were used to transport fuel oil, diesel fuel, gasoline and sometimes black oil-crude oil. Post war many T2s remained in use; like other hastily built World War II ships pressed into peacetime service, there were safety concerns. As was found during the war, the United States Coast Guard Marine Board of Investigation in 1952 stated that in cold weather the ships were prone to metal fatigue cracking, so were "belted" with steel straps. This occurred after two T2s, Pendleton and Fort Mercer, split in two off Cape Cod within hours of each other. Pendleton's sinking is memorialized in The Finest Hours. Engineering inquiries into the problem suggested the cause was poor welding techniques. It was found the steel was not well suited for the new wartime welding construction. The high sulfur content made the steel brittle and prone to metal fatigue at lower temperatures.
The third USS Merrimack (AO-37) (ex-Caddo) was one of five Kennebec-class fleet oilers built during World War II for service in the United States Navy. She also service in the Cold War. She was named after the Merrimack River in Massachusetts and New Hampshire.
The Cimarron-class oilers were an underway replenishment class of oil tankers which were first built in 1939 as "National Defense Tankers," United States Maritime Commission Type T3-S2-A1, designed "to conform to the approved characteristics for naval auxiliaries in speed, radius and structural strength", anticipating their militarization in the event of war. "Tentative plans had been reached with the Standard Oil Company of New Jersey to build ten high-speed tankers with the government paying the cost of the larger engines needed for increased speed. By the first week in December [1937], Standard Oil had solicited and received bids from a number of yards providing for the construction of a number of 16,300-ton (deadweight) capacity tankers. Bids were requested for two versions: a single-screw design of 13 knots and a twin-screw design of 18 knots. The price difference between the two would be used to establish the government's cost subsidy for greater speed. Plans and specifications for both designs were prepared for Standard Oil by naval architect E. L. Stewart. It seems certain that the design for the 18-knot tanker evolved out of the bureau's (C&R) design for a fleet oiler."
USS Kennebec (AO-36) was originally the SS Corsicana, a Kennebec class T2 tanker that was built by Bethlehem Sparrows Point Shipyard in Sparrows Point, Maryland. It was delivered to Socony-Vacuum Oil Company on 8 August 1941. It was purchased by the United States Navy on 13 January 1942 and renamed Kennebec.
USS Neosho (AO–48) was a Kennebec-class type T2 fleet oiler of the United States Navy. The ship was laid down on 8 July 1941, as SS Catawba, by the Bethlehem-Sparrows Point Shipyard Inc., Sparrows Point, Maryland. The purchase came under Maritime Commission contract number 145 for the Socony-Vacuum Oil Company, later renamed Mobil Oil.
USS Lackawanna (AO-40) was a Kennebec-class type T2 fleet oiler of the United States Navy. The ship was laid down 27 December 1941, as SS Conastoga, by the Bethlehem-Sparrows Point Shipyard Inc., Sparrows Point, Maryland, under Maritime Commission contract number 147. Launched on 16 May 1942, sponsored by Mrs. S. J. Dickey, acquired by the Navy on 20 June 1942, and commissioned on 10 July 1942 at Baltimore, Lt. Comdr. S. R. Sands, Jr., USCG, in command.
USS Mattaponi (AO-41) was a Kennebec-class oiler which served in the United States Navy during World War II, periodically during the 1950s, and in the Vietnam War. She was the only U.S. Navy ship named for the Mattaponi River in eastern Virginia.
The second USS Monongahela (AO-42) was a Kennebec-class oiler in the United States Navy which saw service during World War II and the Korean War. She was the second U.S. Navy ship named for the Monongahela River in West Virginia and Pennsylvania.
The Chiwawa-class oilers were United States Navy T3 Tanker oilers of the T3-S-A1 design built during World War II at Bethlehem Sparrows Point Shipyard of Sparrows Point, Maryland. The class consisted of five ships, all of which survived the war.
USS Mizar (AF-12) was the United Fruit Company fruit, mail and passenger liner Quirigua that served as a United States Navy Mizar-class stores ship in World War II.
USS Chiwawa (AO-68) is a former T3-S-A1 Kennebec-class oiler constructed for the United States Navy during World War II. She was the only U.S. Navy ship named for the Chiwawa River in Washington.
USS Escalante (AO-70) was a T3 Kennebec-class oiler built for the United States Navy during World War II. She was the only U.S. Navy ship named for the Escalante River in Utah.
The Type C4-class ship were the largest cargo ships built by the United States Maritime Commission (MARCOM) during World War II. The design was originally developed for the American-Hawaiian Lines in 1941, but in late 1941 the plans were taken over by the MARCOM.
SS Corsicana may refer to one of two Type T2 tankers built for the United States Maritime Commission:
SS Conastoga may refer to one of three Type T2 tankers built for the United States Maritime Commission during World War II:
SS Caddo may refer to one of two Type T2 tankers built for the United States Maritime Commission for the Socony-Vacuum Oil Company:
The Suamico class were a class of 25 United States Navy oilers during World War II. Built to the Maritime Commission T2-SE-A1, -A2 and -A3 (Cohocton) designs, they used turbo-electric transmission, obviating the need for reduction gearing which was a major issue in US mass-production shipbuilding.
The T3 tanker, or T3, are a class of seaworthy large tanker ships produced in the United States and used to transport fuel oil, gasoline or diesel before and during World War II, the Korean War and the Vietnam War. The T3 tanker classification is still used today. The T3 tanker has a full load displacement of about 24,830 tons.
The T1 tanker or T1 are a class of sea worthy small tanker ships used to transport fuel oil before and during World War II, Korean War and Vietnam War. The T1 tanker classification is still in use today. T1 tankers are about 200 to 250 feet in length and are able to sustain a top speed of about 12 knots. The hull designation AO is used by the US Navy to denote the ship is a T1 oil tanker and AOG that the T1 is a gasoline tanker. The small size allows the T1 to enter just about any sea port or to anchor around a small island, this was very useful during the Pacific War. The T1 tanker can carry about 48,000 to 280,000 bbls. Some T1 tankers were used to transport goods other than oil, a few were used for black oil-crude oil, diesel, chemicals and rarely bulk cargo like grain. T1 tankers are also called liquid cargo carriers. The T1 tanker has about a 6,000 to 35,000 deadweight tonnage (DWT) of cargo. The small size also gives the ships short turn around time for repair, cleaning, loading and unloading. A T1 tanker carrying dirty cargo, like crude oil needs a few weeks of labor to clean before carrying clean cargo. Most T1 ships during World War II were named after major oil fields. T1 tankers are operated by the US Navy, War Shipping Administration and United States Maritime Commission. Some T1s were loaned to England in the Lend-Lease program for World War II, after the war most were returned to the US. After World War II many of the T1 ships were sold to for civilian use. Each T1 had emergency life rafts on the boat deck. The ships had cargo booms and piping to load and unload fuel. During war time the T1 are armed for protection with deck guns. A typical ship may have one single 3"/50 dual purpose gun, two 40 mm guns and three single Oerlikon 20 mm cannon. A T1 at war time normally had a crew of 38 and up to 130. If operating as a United States Merchant Marine ship, the crew would be a mix of civilian Merchant Marines and United States Navy Armed Guards to man the guns.
