The trenching support vessel Calamity Jane supports Solitaire, Audacia and Lorelay with activities such as pre and post route survey, crossing preparation and mattress installation, and operates as an independent unit with the mechanical trencher Digging Donald.
So far, Digging Donald has trenched over 3200 km of pipeline worldwide, up to a diameter of 36 inches, in soil conditions ranging from loose sand to very hard clay.
Calamity Jane
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Length overall
141 m (463 ft) -
Transit speed
11 knots -
Accommodation
70 men -
Dynamic positioning system
LR DP (AA); 2 x Alstom DPS 902 -
Cranes
One integral mast crane of 30 t (66 kips) at 27.5 m (90 ft), 20 t (44 kips) at 34 m (112 ft);
One fixed lifting frame of 170 t (375 kips) up to 395 m (1296 ft) water depth, 200 t (441 kips) at 197 m (646 ft) water depth;
A-frame of 35 t (77 kips) up to 3000 m (9,843 ft) water depth
Digging Donald is a crawler of about 10 m (32 ft) wide and 17 m (57 ft) long, weighing about 145 t in air.
It receives its electrical power from Calamity Jane via an umbilical, and the same umbilical transmits observation signals to the vessel for processing.
Allseas’ Digging Donald is the only mechanical pipeline trencher, which never touches the pipeline. It is fully remote controlled from Calamity Jane.
Digging Donald
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Length
17.3 m (57 ft) -
Width
9.6 m (31 ft) -
Height
6.7 m (22 ft) -
Maximum water depth
350 m (1148 ft) -
Maximum speed
500 m / hour -
Installed power
1000 kW (1341 hp) -
Maximum pipeline diameter
48" O.D.
- fly-around Calamity Jane
- production process on board Calamity Jane
- Digging Donald trenching process
- mattress installation process