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Precis File
SHIP NAME: Showa Maru KEY: NUM. ENTRIES: 5
source ETC
type D
volume 51310B
material crude
dead
link


source TEW
type D
volume
material crude
dead
link

Selco salved the fully laden Showa Maru, 238,000 deadweight tons, aground near Buffalo Rock in the Singapore Strait, at the time one of the largest ships in the world to be salved. I heard the distress and took the Salvaliant across the straits, and was first on board the casualty. Selco salvage master Captain Hancox made me his assistant for the 41 day operation.


source MIT79
type D
volume 3100LT
material
dead
link


source Wang, Ohtsubo, Liu, A Simple Method for Predicting the Grounding Strength of Ship, Journal of Ship Research, Vol 41 No 3 Sep 1997
type D
volume 1200m3
material
dead
link

Says one year old VLCC ran aground at speed of 11.5 knots, spill of 1200 m3. Ships dimensions were LBP=304, beam=52.4, draft=19.8, 237000 dwt. Has sketch of bottom damage. Shows FP, 1C, 2C, 3C, and possibly 4S breached as the ship apparently slewed a little just before stopping. The ship's bottom was torn, dented and scratched. A long rupture found in the bottom had a width of 2m to 5m, and extended approximately 180 m from the bow along the centerline. Bottom plating within this range was breached and pushed sideways. The structures on the outer sides of the rupture were heavily concave deformed toward the interior of the tanks. The width of the transverse frame deformation was approximately 7m to 8m. The depth of the indentation was about 2m to 3m. This paper uses this data to test their grounding model.


source CTX
type A
volume 4500T
material C
dead
link

The supertanker Showa Maru, carrying 237,000 tons of crude oil from the Arabian Gulf to Japan, went aground in Malacca Strait near Singapore in the early morning of January 6, 1975. About 4500 tons of oil cargo were spilled from the three tanks damaged during the accident. The Showa Maru was refloated on January 15 after offloading enough cargo to lighten the ship and without significant additional spillage.

Several local sources including the Sinagpore MPA put the spill between 3800 and 4000 tons. The grounding occoured south of Pulau Serabok, in almost the same place as the Evoikos/Orapin Global collision, the narrowest part of the passage for VLCC's.

At this point there are at least two possibilities:

  1. Poor navigation, got outside the channel.
  2. Poor charts. This is the period in which loaded VLCC's were just beginning to use the Straits regularly. One local source uses the words hit a rock.
For now tentatively going with poor navigation, but we need confirmation.

Earlier CTX database had the imo number for this spill at 5325986, which is another Showa Maru, a 43,000 tonner built in 1961.