Abu Dhabi based National Petroleum Construction Company (NPCC) has contracted Chinese shipyard Zhenhua Heavy Industries for the construction of a DLS 4200. The derrick lay vessel developed by Dutch design office Ulstein Sea of Solutions combines double joint S-lay capabilities with a 4200 sT lifting capacitiy.
DLS 4200 is designed to operate worldwide and is equipped with a 10-point mooring system to operate in the Arabian Gulf and India. To meet future market requirements, the design has already been prepared for DP2 upgrade to minimize the technical impact and shorten the upgrade process.
Maximum Efficiency and Cost Effectiveness
The DLS 4200 is designed aiming for maximum efficiency and cost effectiveness and features a center double joint firing line to optimize pipelaying operations that are not hampered by vertical motions due to roll. Ulstein Sea of Solutions’ distinctive feature of separating the pipelay functionality from lifting operations is incorporated in the DLS 4200. The firing line and the double joint fabrication areas are located on the freeboard deck, which is completely covered by the main deck. This provides a clean and dry environment for the pipelay equipment and an unobstructed main deck for lifting operations.
Lifting 4200 sT
The Amclyde Model 80 main crane is capable of lifting 4200 sT (3800 mT) at a 125 ft radius over the stern in tie-back mode and 4200 sT at 95 ft without tie-back. In full revolving mode the crane is able to lift 3635 sT (3300 mT) with an outreach of 130 ft.
13 Knots Cruising Speed
The vessel features two fixed pitch shaft driven main propellers of 5500 kW each which will allow for a cruising speed of 13 knots. To upgrade the vessel to DP2 five (5) retractable azimuth thrusters of 3500 kW each are required.
Particulars
Main dimensions of the vessel are:
– L o.a. 196.9 m
– L p.p. 191.7 m
– Beam (moulded) 43.4 m
– Depth (moulded) 19.6 m
– Draught (design) 7.5 m
– Service speed 13 kn
– Installed power (moored) 4 x 5530 kW
– Installed power (future DP) 6 x 5530 kW
