Sakhalin 4

At 9,305 gross tons, Sakhalin 4 is the 37,013th 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 the typical vessel on record here. The largest measures 499,167 GT.

Among the 58,086 vessels this registry holds no type classification for held here, it ranks 21,072nd by tonnage — larger than 58% of that group. Their median tonnage is 5,358 GT, and the largest tenth begin at 54,309 GT. The flag most often flown by this group is Panama (5,698 ships). The yard that appears most often against it is HD Hyundai Mipo, with 615 hulls on record.

Sakhalin 4 was built in 1975, making it 51 years old. It is one of 1,913 hulls in this registry delivered that year, a cohort whose median tonnage is 2,929 GT; within it this ship is the 559th largest. Across the whole of the 1970s the registry holds 17,331 vessels, median 2,774 GT. The median build year across the entire registry is 1995.

At 127.0 m overall, Sakhalin 4 is 12.0 m longer than the 115.0 m median for vessels this registry holds no type classification for on record.

IMO numbers are issued in broadly chronological blocks. Within 500 either side of 7529706 this registry holds 43 other vessels, whose median build year is 1976 and which range from 1975 to 1985. That places this hull’s registration in the same part of the series, consistent with its recorded build year of 1975.

Its IMO number, 7529706, carries its own check digit. The first six digits are weighted seven down to two and summed — 7×7 + 5×6 + 2×5 + 9×4 + 7×3 + 0×2 = 146 — and the last digit of that total, 6, must equal the seventh digit, 6. It does, so this number is well formed.