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Precis File
SHIP NAME: Sinoda KEY: NUM. ENTRIES: 4
source LMIU
type C
volume
material
dead 1
link

Explosion, broke in two, sank Sep 14 1985 in approx 33 30 N 139 30 E, while undergoing gas-freeing operations. One dead


source Fairplay 19860213 page 40
type D
volume
material
dead
link

Has Associated Press picture which shows the ship failed in sag, just about midships. Caption says The 16,423 grt tanker Sinoda broke in two and sank after an explosion during gas-freeing last year.


source FSI 3/5
type A
volume
material
dead 1
link

Broke in two and sank after explosion off Hachijoshima which occurred during gas-freeing operation after off loading cargo of naptha,

Ballasting to press up the cargo tanks to gas free and clean tanks is not a recommended procedure; but it was employed in this case due to inoperative butterworth system. An explosive atmosphere was generated by this system, which could have been ignited by steel against steel movement.


source CTX
type C
volume
material
dead 1
link

The FSI 3/5 entry is extracted from the flag state (Liberian) investigation report, which we are not allowed to see. It is not very clear; but 15 years after the Mactra et al, the ship was almost certainly not inerted. Charterers felt that IG might contaminate clean products, so IMO did not require IGS on products tankers below 40,000 dwt. and few products tanker owners installed it. if you need to enter the tank, gas freeing by ballasting is safer than simply venting the tanks, But the problem is you are pushing a flammable vapor out on deck, The real fault here is a regulatory system that took close to 20 years to impose inerting on (almost) all tankers.