At 189 gross tons, C-Tractor 4 is the 81,282nd 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 1,051st by tonnage — larger than 16% 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.
United States is the country of registry for 2,278 vessels in this directory, of which C-Tractor 4 is the 1,425th largest by tonnage. The most common class under that flag is vessels this registry holds no type classification for (977 ships), and the median vessel measures 1,706 GT. Browse every ship flagged United States.
Narrowing to both dimensions at once, this registry holds 239 tugs flying the United States flag, of which 151 are larger by tonnage.
C-Tractor 4 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 1,205th 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.
The registry attributes 95 vessels to North American Shipbuilding, with a median tonnage of 2,912 GT, delivered between 1978 and 2018. See the rest of that yard’s output.
At 29.3 m overall, C-Tractor 4 is 3.0 m shorter than the 32.3 m median for tugs on record, with a beam of 11.3 m and a draft of 3.3 m.
IMO numbers are issued in broadly chronological blocks. Within 500 either side of 8835176 this registry holds 52 other vessels, whose median build year is 1984 and which range from 1944 to 1990. That places this hull’s registration in the same part of the series, consistent with its recorded build year of 1990.
Its IMO number, 8835176, carries its own check digit. The first six digits are weighted seven down to two and summed — 8×7 + 8×6 + 3×5 + 5×4 + 1×3 + 7×2 = 156 — and the last digit of that total, 6, must equal the seventh digit, 6. It does, so this number is well formed.
