Tue. Apr 28th, 2026

Seawise Giant

The TT Seawise Giant is a well-known tanker that has been the longest self-propelled ship ever built for many years. The tanker maintained this primacy until 2013, when it was surpassed by about 30 meters by the Floating Liquified Natural Gas installation Shell Prelude (FLNG).

The ship was built between 1974 and 1979 by the Japanese company Sumitomo Heavy Industries and served at sea until 2009. Already in 1988 during the Iraq-Iran conflict, it was sunk, but was eventually rescued and rebuilt floating storage and offloading unit (FSO). Between 2004 and 2009, she served again.

technical parameters Seawise Giant

 

Name
  • Seawise Giant (1979–1991)
  • Happy Giant (1991)
  • Jahre Viking (1991–2004)
  • Knock Nevis (2004–2009)
  • Mont (2009–2010)
Port of registry Norway (1980–2010)
Owner
  • Amber Development (2009–2010)
  • First Olsen Tankers Pte. (2004–2009)
  • Loki Stream AS (1991–2004)
Identification
  • Call sign: S6AV7
  • DNV ID: 16864
  • IMO number: 7381154
  • MMSI no.: 564687016
Builder
  • Sumitomo Heavy Industries, Ltd. Yokosuka, Kanagawa, Japan
Completed 1979
Out of service 1988 and 2009
Tonnage
  • 260,941 GT
  • 214,793 NT
  • 564,763 DWT
Propulsion
  • 2 Mitsubishi V2M8 boilers (Designed by Combustion Engineering)
  • Sumitomo Stal-Laval AP steam turbine, 50,000 hp
Displacement
  • 81,879 long tons light load
  • 646,642 long tons full load
Type Crude oil tanker
Length 458.45 m (1,504.10 ft)
Beam 68.6 m (225.07 ft)
Draft 24.611 m (80.74 ft)
Depth 29.8 m (97.77 ft)
Speed 16.5 knots (30.6 km/h; 19.0 mph)
Capacity 4.1 million barrels

Seawise Giant

MT Jahre Viking