Niihama Maru

At 190 gross tons, Niihama Maru is the 81,257th largest of the 84,014 vessels in this registry that report a tonnage. The median across that set is 5,994 GT, so this hull is about 32 times smaller than the typical vessel on record here. The largest measures 499,167 GT.

Among the 1,471 tugs held here, it ranks 1,049th by tonnage — larger than 17% of that group. Their median tonnage is 393 GT, and the largest tenth begin at 1,733 GT. The flag most often flown by this group is United States (239 ships). The yard that appears most often against it is Damen Shipyards Gorinchem, with 62 hulls on record.

Japan is the country of registry for 2,663 vessels in this directory, of which Niihama Maru is the 2,317th largest by tonnage. The most common class under that flag is vessels this registry holds no type classification for (1,534 ships), and the median vessel measures 764 GT. Browse every ship flagged Japan.

Narrowing to both dimensions at once, this registry holds 19 tugs flying the Japan flag, of which 9 are larger by tonnage.

Niihama Maru was built in 1990, making it 36 years old. It is one of 1,306 hulls in this registry delivered that year, a cohort whose median tonnage is 2,025 GT; within it this ship is the 1,203rd largest. Across the whole of the 1990s the registry holds 12,006 vessels, median 4,956 GT. The median build year across the entire registry is 1995.

At 33.0 m overall, Niihama Maru is within a metre of the 32.3 m median length for tugs on record.

IMO numbers are issued in broadly chronological blocks. Within 500 either side of 9004956 this registry holds 86 other vessels, whose median build year is 1991 and which range from 1990 to 1994. That places this hull’s registration in the same part of the series, consistent with its recorded build year of 1990.

Its IMO number, 9004956, carries its own check digit. The first six digits are weighted seven down to two and summed — = 116 — and the last digit of that total, 6, must equal the seventh digit, 6. It does, so this number is well formed.