10.6 DP SYSTEMS (IF APPLICABLE) 10.6.1
A vessel with a minimum DP Class 2 will be required. However DP Class 3 vessels should be used in
operations where the consequences of a loss of position are considered to have a reasonable potential
to result in death, substantial structural damage or significant environmental pollution. See Section
13.2 of 0001/ND, Ref. [1] for more details
10.6.2
DP operating and positioning procedures (as applicable) should be documented and include station
keeping analyses/rosettes, Vessel DP system FMEA & Annual Trials Reports etc. as required in
Section 13.8 of 0001/ND, Ref. [1].
10.6.3
For all lifts a minimum of 3 independent reference systems shall be provided.
10.7 MOORING SYSTEMS (IF APPLICABLE) 10.7.1
The mooring arrangement for the operation and stand-off position shall be documented. This should
include the lengths and specifications of all mooring wires and anchors, and a mooring plan showing
adequate horizontal clearances on all platforms, pipelines and any other seabed obstructions. An
elevation of the catenary for each mooring line, for upper and lower tension limits, shall demonstrate
adequate vertical clearance over pipelines and horizontal clearance to fixed installations and the
structure being lifted.
10.7.2
Anchor plans shall indicate the anchor position and the anchor line touch down point at the most likely
working tensions. All subsea infrastructures and pipelines shall be shown together with exclusion
zones. Anchor clearances to subsea assets shall be in accordance with see 0032/ND, Ref. [6].
10.7.3
Mooring analyses shall be submitted based on 0032/ND, Ref. [6], with calculations showing the anchor
holding capacities for the soils expected, based on the site geotechnical data.
10.7.4
The mooring analysis shall also provide the limiting seastate for the installation vessel in the working
position, including the transient motion due to a failed mooring line scenario.
