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A public reference property of Baalvion
Open data · every figure carries its source
Largest in this registry
#37,168
of 84,014 with a recorded tonnage
Largest unclassified
#21,175
of 49,696 of this type with a recorded tonnage
Largest in its fleet
#2
of 3 in this fleet with a recorded tonnage
In brief
Seawell ,the worlds most successful diving vessel , entered service in 1987 as a diving support vessel but it is widely credited with pioneering subsea light well intervention in the North Sea after completing its first well intervention project in 1988. In 1996 the Seawell performed what is thought to be the first ever installation of a replacement subsea tree from a Dynamically Positioned mono-hull vessel anywhere in the world. In 1998 the Seawell completed the world's first ever wireline intervention on a horizontal subsea tree on Amoco Exploration's Arkwright Field in the North Sea. Currently owned by Helix Energy Solutions Group and operated by the company’s well intervention business unit, Helix Well Ops, the Seawell has entered more than 650 wells, decommissioned more than 150 live and suspended wells and 15 subsea fields. The vessel is Dynamically Positioned and features a purpose-built derrick over a 7 m x 5 m moonpool and a traveling block rated to 150 Te capacity in AHC & PHC modes.
The Seawell is also equipped with an 18 man saturation diving system and 2 ROVs, an observation vehicle & a work class vehicle.
Vessel particulars
Every value is as recorded in the source. Blanks are values the source does not hold — none is estimated from a sister ship or a class average.
Identification
Construction
Measurements
In context
Every figure in this section is a count, a rank or a percentile over vessels actually held in this registry — not over the world fleet, which is larger. Nothing here is estimated.
At 9,158 gross tons, MSV Seawell is the 37,168th 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 1.5 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 21,175th by tonnage — larger than 57% 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.
United Kingdom is the country of registry for 2,394 vessels in this directory, of which MSV Seawell is the 393rd largest by tonnage. The most common class under that flag is vessels this registry holds no type classification for (1,835 ships), and the median vessel measures 2,515 GT. Browse every ship flagged United Kingdom.
Narrowing to both dimensions at once, this registry holds 1,835 vessels this registry holds no type classification for flying the United Kingdom flag, of which 200 are larger by tonnage.
MSV Seawell was built in 1987, making it 39 years old. It is one of 819 hulls in this registry delivered that year, a cohort whose median tonnage is 1,937 GT; within it this ship is the 224th 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 111.0 m overall, MSV Seawell is 4.0 m shorter than the 115.0 m median for vessels this registry holds no type classification for on record, with a beam of 22.0 m and a draft of 6.8 m.
IMO numbers are issued in broadly chronological blocks. Within 500 either side of 8324567 this registry holds 56 other vessels, whose median build year is 1984 and which range from 1983 to 1989. That places this hull’s registration in the same part of the series, consistent with its recorded build year of 1987.
Its IMO number, 8324567, carries its own check digit. The first six digits are weighted seven down to two and summed — 8×7 + 3×6 + 2×5 + 4×4 + 5×3 + 6×2 = 127 — and the last digit of that total, 7, must equal the seventh digit, 7. It does, so this number is well formed.
Nearest by tonnage among vessels this registry holds no type classification for
| Ship | Built | Gross tonnage |
|---|---|---|
| Straat Banka | 1952 | 9,161 |
| Gramosti | 1984 | 9,160 |
| Sammarina M | 1982 | 9,160 |
| MSV Seawell (this ship) | 1987 | 9,158 |
| Trust 38 | 1974 | 9,157 |
| Jing Yin 01 | 2017 | 9,157 |
| Budi Setia |
Same fleet
Provenance
Vessel recordWikidata, released under CC0, keyed on this ship’s IMO number.
Written summaryQuoted from MSV Seawell on English Wikipedia, reused under CC BY-SA 4.0.
PhotographBy Helix ESG, reused under CC BY 2.0.
| 1974 |
| 9,156 |