Lelystad

At 12,116 gross tons, Lelystad is the 33,283rd 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 2.0 times the typical vessel on record here. The largest measures 499,167 GT.

Among the 360 dredgers held here, it ranks 29th by tonnage — larger than 92% of that group. Their median tonnage is 2,086 GT, and the largest tenth begin at 11,701 GT. The flag most often flown by this group is People's Republic of China (43 ships). The yard that appears most often against it is Royal IHC, with 21 hulls on record.

Lelystad was built in 1986, making it 40 years old. It is one of 866 hulls in this registry delivered that year, a cohort whose median tonnage is 4,769 GT; within it this ship is the 309th 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.

The registry attributes 85 vessels to Royal IHC, with a median tonnage of 9,125 GT, delivered between 1947 and 2024. See the rest of that yard’s output.

At 137.0 m overall, Lelystad is 57.0 m longer than the 80.0 m median for dredgers on record and a draft of 8.2 m.

IMO numbers are issued in broadly chronological blocks. Within 500 either side of 8507391 this registry holds 42 other vessels, whose median build year is 1986 and which range from 1984 to 1992. That places this hull’s registration in the same part of the series, consistent with its recorded build year of 1986.

Its IMO number, 8507391, carries its own check digit. The first six digits are weighted seven down to two and summed — 8×7 + 5×6 + 0×5 + 7×4 + 3×3 + 9×2 = 141 — and the last digit of that total, 1, must equal the seventh digit, 1. It does, so this number is well formed.