IMO 5172523

At 3,642 gross tons, IMO 5172523 is the 49,234th 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 1.6 times smaller than the typical vessel on record here. The largest measures 499,167 GT.

Among the 494 reefers held here, it ranks 325th by tonnage — larger than 27% of that group. Their median tonnage is 5,893 GT, and the largest tenth begin at 12,345 GT. The flag most often flown by this group is Panama (80 ships). The yard that appears most often against it is Kitanihon Shipbuilding, with 24 hulls on record.

IMO 5172523 was built in 1947, making it 79 years old. It is one of 69 hulls in this registry delivered that year, a cohort whose median tonnage is 2,304 GT; within it this ship is the 6th largest. Across the whole of the 1940s the registry holds 1,039 vessels, median 4,053 GT. The median build year across the entire registry is 1995.

The registry attributes 87 vessels to Kockums, with a median tonnage of 33,652 GT, delivered between 1894 and 1987. See the rest of that yard’s output.

At 115.7 m overall, IMO 5172523 is 12.8 m shorter than the 128.4 m median for reefers on record.

IMO numbers are issued in broadly chronological blocks. Within 500 either side of 5172523 this registry holds 9 other vessels, whose median build year is 1953 and which range from 1907 to 1963. That places this hull’s registration in the same part of the series, consistent with its recorded build year of 1947.

Its IMO number, 5172523, carries its own check digit. The first six digits are weighted seven down to two and summed — 5×7 + 1×6 + 7×5 + 2×4 + 5×3 + 2×2 = 103 — and the last digit of that total, 3, must equal the seventh digit, 3. It does, so this number is well formed.