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Precis File
SHIP NAME: Yuyo Maru 10 KEY: NUM. ENTRIES: 7
source SIS83
type D
volume
material
dead
link

collision in tokyo bay


source CUTTER
type D
volume
material
dead
link

calls this ship Yuyo Maru 10, says the ship was scuttled


source ETC
type D
volume 366500B
material naptha
dead
link


source SIGGTO
type A
volume 79500KL
material naptha and lpg
dead 34
link http://www.sigtto.org/pub/ASP-Version/siggtoPUBS/43.pdf

Yuyo Maru 10 was a combination LPG/Oil Products carrier with four fully refrigerated LPG centre tanks of about 47,500 m3 total capacity. While loaded with a full cargo of butane and propane in the centre tanks and of naptha in the wing tanks, she was in collision with a bulk carrier, Pacific Ares in Tokyo Bay. Naptha spilled from an opening 24 meters in length and extending to below the waterline in No 1 starboard tank wing tank.

The naptha immediately caught fire and flames enveloped the whole of the Pacific Ares and the starboard side of the Yuyo Maru. Twenty-nine of the crew from the bulk carrier and five men on the gas carrier were killed, LPG vapour escaping from the safety valves and ullage fittings of Nos. 1, 2, and 3 LPG tanks ignited and burned continuously at the points of emission. The Yuyo Maru continued to burn and fire spread to No 2 and 3 starboard wing naptha tanks, with sporadic eruptions of flame. Despite major efforts by firefighting tugs, it was not possible to extinguish the fires. Finally after 19 days, the ship, still burning, and having been towed far out to sea, was sunk by torpedo and gunfire.


source IMO
type A
volume
material naptha and lpg
dead 33
link http://www.imo.org/includes/blastData/doc_id=426/IMDGdangerousgoodsfocus1997.pdf

On 9 November 1974, in Tokyo Bay, Japan, the Japanese LPG tanker Yuyo Maru 10 carrying refrigerated LPG in her cargo tanks and Naptha in her wing tanks and forward reserve cargo oil tank, was struck approximately at a right angle on her starboard bow by the bow of the Liberian cargo vessel Pacific Ares. As a result of the collision, the outer plating of the forward reserve cargo tank and the No 1 starboard wing tank (both containing naptha) was broken. This allowed a large amount of naptha to flow out onto the Pacific Ares and onto the water. The naptha caught fire, killing five of the Yuyo Maru crew members and 28 on the Pacific Ares.


source CH-IV International
type A
volume
material
dead
link

The following information pertains to a liquid petroleum gas tanker (LPG) which has a similar construction to an LNG tanker. The information was obtained from a Japanese marine registry record. The annotations [[text]] were added by the authors for clarity. The Motorship “Yuyo Maru No. 10” (gross tonnage of 43,723), laden with 20,831 MT of light naphtha, 20,202 MT of propane and 6,443 MT of butane, left Ras Tanura, in the Kingdom of Saudi Arabia, for Kawasaki, and the port of Keihin on October 22, 1974. While the vessel was sailing northward along the Naka-no Se Traffic Route in Tokyo Bay on November 9, she collided with the Motorship “Pacific Ares” (gross tonnage of 10,874), manned with a Taiwanese Master and 28 crew members, laden with 14,835 MT of steel products, en route from Kisarazu for Los Angeles, USA. The collision occurred about 13:37 hours on the same day slightly northward of the boundary line of the Naka-no Se Traffic Route.

As a result of the collision, the “Yuyo Maru No. 10” suffered a large hole at the point of collision, with her cargo naphtha [[CH-IV: The naphtha was carried in its outer ballast tank (between the insulated LPG tanks and the hull of the ship). The LPG cargo tank was not penetrated.]] instantly igniting into flames. As a result of the outflow of naphtha overboard, the sea surface on her starboard side literally turned into a sea of fire. The “Pacific Ares” showered with fire burst into flames in the forecastle and on the bridge. While explosions occurred one after another [[CH-IV: naphtha, not propane]] [CTX: believes LPG heated up, vented, and was involved in the fire], attempts were made to tow the “Yuyo Maru No 10”, outside the bay, but she ran aground in the vicinity of Daini Kaiho. She was successfully towed out of Tokyo Bay and sunk south of Nojima Saki on the afternoon of November 27 by cannon, air bomb and torpedo attacks staged by the Maritime Self-Defense Force. On board the “Yuyo Maru No. 10”, five crew members were killed and seven others injured by this accident. The “Pacific Ares”, whose forward section was completely crushed and superstructures burned down, was later repaired. Her crew members were all killed except one person, who was injured but rescued.


source CTX
type D
volume 79500KL
material
dead 34
link

Japanese source says collision was at north entrance of Senoguchi Route in the Uraga Channel. Says Yuyo was en route to Kawaski, collision with Pacific "Alice" and "was burnt down".

The double brackets in CH-IV entry are CH-IV comments, not CTX comments. CTX does not agree with CH-IV's claim that the LPG was not involved in the fire. CH-IV International is arguing that LNG tankers are safe. But admits that photos taken during the scuttling show "The ship's LPG vent stacks were melted down to just above the decks and on fire indicating that LPG remained within the storage tanks." This only shows that some LPG was still burning. With the vent stacks gone, there was nothing to keep the LPG in the tanks. CTX agrees with SIGGTO on this one.

Hooke account adds nothing to the above accounts.

We don't know what caused this killer casualty. This smells like a dance of death with Yuyo going port and Ares going starboard, but need confirmation.