At 497 gross tons, Tansei Maru is the 73,781st 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 12 times smaller than the typical vessel on record here. The largest measures 499,167 GT.
Among the 612 research / surveys held here, it ranks 414th by tonnage — larger than 14% of that group. Their median tonnage is 2,180 GT, and the largest tenth begin at 9,452 GT. The flag most often flown by this group is United States (90 ships). The yard that appears most often against it is Wärtsilä, with 36 hulls on record.
Japan is the country of registry for 2,663 vessels in this directory, of which Tansei Maru is the 1,750th 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 14 research / surveys flying the Japan flag, of which 10 are larger by tonnage.
Tansei Maru was built in 1982, making it 44 years old. It is one of 1,706 hulls in this registry delivered that year, a cohort whose median tonnage is 3,592 GT; within it this ship is the 1,422nd largest. Across the whole of the 1980s the registry holds 13,213 vessels, median 3,004 GT. The median build year across the entire registry is 1995.
At 51.0 m overall, Tansei Maru is 20.0 m shorter than the 71.0 m median for research / surveys on record.
IMO numbers are issued in broadly chronological blocks. Within 500 either side of 8130265 this registry holds 39 other vessels, whose median build year is 1982 and which range from 1981 to 1999. That places this hull’s registration in the same part of the series, consistent with its recorded build year of 1982.
Its IMO number, 8130265, carries its own check digit. The first six digits are weighted seven down to two and summed — 8×7 + 1×6 + 3×5 + 0×4 + 2×3 + 6×2 = 95 — and the last digit of that total, 5, must equal the seventh digit, 5. It does, so this number is well formed.
