Spring Bob

At 12,111 gross tons, Spring Bob is the 33,285th 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 494 reefers held here, it ranks 48th by tonnage — larger than 89% 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.

Spring Bob was built in 1984, making it 42 years old. It is one of 1,492 hulls in this registry delivered that year, a cohort whose median tonnage is 4,366 GT; within it this ship is the 509th 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 265 vessels to Imabari Shipbuilding Hiroshima Shipyard, with a median tonnage of 66,332 GT, delivered between 1969 and 2025. See the rest of that yard’s output.

At 150.7 m overall, Spring Bob is 22.3 m longer than the 128.4 m median for reefers on record, with a beam of 24.1 m and a draft of 8.6 m.

IMO numbers are issued in broadly chronological blocks. Within 500 either side of 8213665 this registry holds 51 other vessels, whose median build year is 1983 and which range from 1982 to 1986. That places this hull’s registration in the same part of the series, consistent with its recorded build year of 1984.

Its IMO number, 8213665, carries its own check digit. The first six digits are weighted seven down to two and summed — 8×7 + 2×6 + 1×5 + 3×4 + 6×3 + 6×2 = 115 — and the last digit of that total, 5, must equal the seventh digit, 5. It does, so this number is well formed.