San Clemente-class oil tanker

USNS Mercy leaving San Diego Bay in May 2008
Class overview
BuildersNational Steel & Shipbuilding Company
SubclassesT-AH-19
Built1974-1978
Completed13
Active6, 2 as Mercy-class hospital ship
Lost1
General characteristics
TypeOil tanker - two Hospital ships
Tonnage89,700 dwt
Length894 ft (272 m)
Beam105 ft (32 m)
Draft64 ft 6 in (19.66 m)
PropulsionSteam, 24,500 bhp (18,300 kW)
Speed16.5 knots (30.6 km/h; 19.0 mph) at 90% MCR, Full Load
Capacity32,5000 Cu feet
Crew21 (Hospital ship 1,000)

The San Clemente-class oil tanker is a class of oil tankers built by National Steel & Shipbuilding Company (NASSCO), San Diego. The size places them in the category of super tankers. They were built to serve the Trans-Alaska Pipeline System. At the time of completion NASSCO was equally owned by Kaiser Industries Corporation and Morrison Knudsen.

NASSCO also built the San Diego-class tankers at 180,000-dwt, Catalina-class tankers at 150,000- dwt and the Coronado-class tankers at 38,300-dwt. NASSCO also built for the US Navy Yellowstone-class destroyer tender (AD-41 class) at 19,800-ton each.

Two ships were converted by NASSCO to T-AH-19 hospital ships. The two hospital ships were delivered to the US Navy in 1986 and 1987 as Naval Auxiliary Fleet ships. The two provided for the Navy deployable acute medical care facility. Each has 1,000-bed medical care unit. They are used for armed forces and mercy missions to damaged locations, like after a typhoon.