Multipurpose Polar Icebreaking Subsea

Work VesselNiko Kantonen

Santeri Ihalainen

Resistance

• In conceptual design we have calculated clear water resistance with ITTC-57 and ice resistance with Lindqvist method

• Now we need to calculate the resistance with couple of other calculation methods (for example Holtrop, ITTC-74, Taylorgertler)

• We need to update the calculations with the specified dimensions of the ship and with the different vessel speed values + present the speed range

• We can identify more resistance components than in conceptual design

Resistance• Resistance calculated in conceptual design

Propulsion

• Propulsion solutions need to completely checked because we probably need to change the amount of pods from what was designed in conceptual design

• The general arrangement has changed while creating the NAPA model of ship

• Recalculation of propeller particulars and cavitation risks

• Checking will we need a different size of propellers than in the conceptual design

Machinery

• The selected genset solution in the earlier phase was the Wärtsila 38 series with 4 engines of two different size

Machinery

• One type of machinery selection made in conceptual design but no comparison with alternative options

• Need to compare different engine set solutions

• Many aspects need to be considered: number of engines, fuel type, energy efficiency, fuel consumption, space reservation

• Energy balance chart needs to be done

• Operational profile of the energy usage needs to be calculated

Schedule and work breakdown

• We will be working under these topics during the next two weeks

• Santeri will be concentrating more on the resistance part

• Propulsion decisions will be discussed and worked together

• Niko will be on machinery part