Siem Offshore Contractors
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ISV Siem Moxie

A unique Installation Support Vessel specially designed and equipped to allow quick and safe “walk to work” access to offshore installed assets. The vessel provides a reliable platform for offshore wind farm operations including: installation, repair and maintenance operations as well as technician accommodation and transport.

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Realtime vessel position (MarineTraffic)

Vessel details (MarineTraffic)

 

General

The vessel design is based on an SX 163 design to meet future demands of the offshore wind industry. The vessel is environmentally friendly with a focus on low fuel consumption and has been designed in line with DNV’s Clean Design guidelines. With its optimized hull form, including the X-bow shape, sophisticated propulsion system, 3D motion-compensated knuckle boom crane and active motion-compensated personnel transfer gangway, the vessel is optimized for working in demanding weather conditions. The vessel design is hereby focused on optimal safety, efficiency, capability and comfort. The propulsion system comprises speed controlled electric motors through two Voith Schneider Rudder ECS propeller units, one retractable thruster and two transverse tunnel thrusters. In addition to the exceptional active roll-stabilisation achieved by the Voith Schneider system, a passive roll reduction system is built in.

 

Description

High standard accommodation for 60 persons with low noise levels. With its optimized hull form, including the X-bow shape, sophisticated propulsion system, 3D motion-compensated knuckle boom crane and active motion-compensated personnel transfer gangway, the vessel is optimized for working in demanding weather conditions. The vessel design is focused on optimal safety, efficiency, capability and comfort. The propulsion system comprises speed controlled electric motors through two Voith Schneider Rudder ECS propeller units, one retractable thruster and two transverse tunnel thrusters. In addition to the exceptional active roll-stabilisation achieved by the Voith Schneider system, a passive roll reduction system is built in.

The vessel’s main services/duties are:
Support of installation, repair and maintenance services on fixed offshore structures and other offshore installed assets.
Safe transfer of personnel from a fixed structure to the vessel and vice versa.
Safe lifting operations of up to 5 tons to and from a fixed structure.
The vessel is fitted with:
Active motion-compensated personnel transfer gangway.
3D motion compensated knuckle boom crane.
Main Particulars
Length overall Approx. 74.0 m
Length between p.p. Approx. 70.7 m
Breadth moulded Approx. 17.0 m
Depth from main deck Approx. 8.0 m
Max. draught Approx. 6.4 m
Design draught Approx. 6.0 m
Freeboard at max. draught Approx. 1.6 m
Freeboard at design draught Approx. 2.0 m
Capacities (100%)
Fuel oil Approx. 955 m³
Fresh water Approx. 780 m³
Water ballast/TFW Approx. 1,877 m³
Lub. Oil & Hydr. Oil Approx. 55 m³
Sewage Approx. 160 m³
Deck load (VCG 1 m ab. main dk.) Approx. 500 t, 5 t/m²
Cargo deck area Approx. 190 m²
Deadweight at max. draught Approx. 2,798 t
Gross tonnage Approx. 4,349 t
Maximum deck cargo capacity is based on a draught less than vessel maximum draught.
Classification and Regulations
The vessel is built and accredited in accordance with NMA (Norwegian Maritime Authority). Main Class is DNV *1A1 with the following Class notations: Offshore Service Vessel, SF, E0, BIS, DYNPOS-AUTR, CLEAN DESIGN, COMF-V(3), NAUT-OSV (A), SPS. IMO MSC.266(84) - Code for Special Purpose Ships, 2008.
Nationality
Norwegian flag (NIS)
Thrusters
Two off Tunnel thrusters fwd., electrically drivenVariable speed, controllable pitch typePropeller diameter approx.: 2,250 mmMotor rating approx.: 1,200 kW at 900 rpmFresh water cooled electric motor
One off Retractable azimuth thruster fwd., electrically drivenVariable speed, controllable pitch typePropeller diameter approx.: 1,650 mmMotor rating approx.: 850 kW at 1,200 rpmFresh water cooled electric motor
Roll Reduction System
Two off Passive roll reduction tanks
Active roll stabilisation is achieved through the Voith Schneider pro-pulsion and control system.
Joystick
The vessel is equipped with a joystick system which integrates control of the main propulsion units rpm and two off side thrusters and one off retractable thruster simultaneously in one off single control lever.
DP System
The vessel is equipped with DP 2 (Dynpos AUTR) SYSTEM comprising the following reference system and sensors:
Two off Wind sensors with heating
Three off Motion Reference Units (3 off x-y direction)
Two off Differential GPS Systems
One off Cyscan Laser Reference System One offRadar Relative Position SensorMain
Anti Heel System
The vessel is equipped with DP 2 (Dynpos AUTR) SYSTEM comprising the following reference system and sensors:
Two off Wing tanks
One off Pump with el. motor, capacity approx. 400 m³/h
Electrical System
Alternating current system, 3 phase 60 Hz for the general el. system acc. to DIN and/or IEC norms. System voltages: 690VAC, 440VAC, 230VAC and 24V DC.
Machinery Systems
Two off F.O. day tanks
Two off F.O. settling tanks
Three off F.O. transfer pumps
Two off F.O. separators
Three of L.O. transfer pumps
Two off WB/TW pumps
Two off FW pumps
Two off Starting air compressors
Two off Starting air tanks of vessels
One off Working air compressor
Three off Bilge pumps
One off Bilge water separator
Two off Fire pumps
One off Emergency fire pump
One off Watermist fire protection system in engine room
Safety Equipment
The vessel has safety equipment according to SOLAS and flag state requirements.
Two off Fast Rescue Craft of approved type with aluminium hull, inboard diesel engine and water jet propulsion basin
Two off Single-point davit of approved type for Fast Rescue Craft
Six off Life rafts, 35 persons each, 3 on each side

Uptime Active Motion-Compensated Personnel Transfer Gangway

An offshore access gangway (transfer system) is installed on the C-deck mid-ship. The transfer system is based on an active motion-compensated gangway system and can work in various modes. Access to the transfer system is arranged directly from the C-Deck on a permanent basis thus allowing for easy and safe access of personnel. Siem Moxie has been designed to operate in 3.5m significant wave height for transfer of personnel to and from foundations as well as the transfer of goods from the vessel to foundations using the 3D compensated crane based on Class requirements for the area of operation.

 

MacGregor Three Axis Compensated crane

The vessel is fitted with a 3 dimensional motion-compensated knuckle boom crane on a newly designed pedestal base, situated on the aft B-deck in vessel centreline. The compensating base can be locked allowing the crane to be used as a conventional offshore heave compensated pedestal crane.

The crane capacity is SWL 5 t at 25 m outreach, at a height of 30 m above sea level. The crane can typically be used to place 10’ container or suitable pallet and box loads on offshore wind turbine generator transition pieces or on unmanned offshore installations.

The crane, which has a hydraulically-tilting foundation, is mounted at the centre point of the vessel. Although all areas of the vessel experience the same angular movements in a seaway, positioning the crane at the centre of the vessel minimises the actual physical displacement of the crane and its load. The crane’s tilting foundation compensates for pitch and roll, maintaining the crane pedestal vertical with respect to the sea bed; active heave compensation provides the third degree of stabilisation.

The crane complies with DNV lifting regulations. A motion reference unit (MRU) is the primary sensor for calculating heave motion. In addition, a secondary sensor placed at the crane boom tip is used to verify the MRU’s accuracy and provide overall redundancy, adding to the system’s safety.

 

Workability

The vessel is designed to operate in 3.5 m significant wave height for the cable handling as well as the work-class and trenching ROV launch and recovery systems based on Class requirements for the area of operation.

Main Propellers
Two off Voith Schneider ECS Propellers and Cycloidal Rudders and associated transmission
Power is approx. 1,850 kW
Motor speed 0 – 1,200 rpm
Blade orbit diam. 2,800 mm
Blade length of 2,340 mm
No. of blades: 5
Generators
Two off Main engine generator sets, capacity approx. 1,840 ekW at 1,800 rpm
Two off Main engine generator sets, capacity approx. 1,380 ekW at 1,800 rpm Total output approx. 6,440 ekW
One off Emergency generator set with air radiator-cooled engine Emergency generator output approx. 285 ekW at 1,800 rpm
Deck Machinery
One off Double electric windlass/mooring winch with cable lifters, drums and warping heads
Two off Electric mooring winches aft, 10 t each

Particulars are believed to be correct, without guarantee.

jill-falenschek
Want to know more?
Lets have a chat!
Jill Falenschek
Sales & Marketing Assistant
+49(0)491-91243-0
jill.falenschek@siemoffshore.com