by GuestfromEU » August 6, 2019, 8:10 am
There are some recently constructed ocean trading ships with accommodations forward, though it is not common. Heavy-lift project cargo ships commonly use this design (see the common Lakes visitors in the fleet of BigLift Shipping).
Semi-submersible, heavy transport ships also commonly have accommodations (and machinery spaces) at the bow. These are the ships which "sink" down into the water, a load (another ship, project cargo, etc) is floated over the sunken part of the heavy-lift ship, and ballast pumped out to raise the ship out of the water. The Boskalis/Dockwise fleet is a primary example. Again, the large, uninterrupted deck space (with potential for cargo to overhang the rear) proves the accommodation forward design is beneficial.
Offshore oil exploration drillships also have accommodations forward, machinery spaces aft. This is so the ship's deck space can be used for the drilling and production machinery, with the forward accommodations designed for visibility of the navigation crew.
Offshore supply vessels use accommodation forward designs for more open deck space. Some "new" designs using an accommodation aft with traditional forecastle bow have been tried, but they are not catching on.
What all of those above generally have in common is diesel-electric propulsion. In this manner, the engine room can be placed anywhere, or at least with more freedom in design. The electric motors which drive the propellers, azimuth thrusters, or power the azipod propulsion units, are installed local to the unit (e.g. diesel engine generator up forward, electric drive motor aft in front of the propellor). In other cases, such as the BigLift ships, the engine rooms are located aft, so variations do exist.
The idea of extra cabling and machinery being a deciding factor is not always so clear. If the ship's designed trade proves a forward-located accommodation and bridge will be better, then the shipowner will specify it. The cost of extra machinery and steel is an additional cost, but not a dealbreaker and ongoing maintenance for the ship's life cycle is relatively minor. That said, the ultimate goal of shipbuilding is to do it as low cost as possible.
The above-noted ships are some examples of most ships with this design. That they are all specialized ships, engaging in niche trades. There is no justifiable reason to build a simple bulk carrier with forward accommodations as was done in the past, the same as oil tankers are no longer designed with an amidship accommodation/bridge. In this case, the cost/benefit does not offer any advantage to building a two-house, fore and aft ship.
There are some recently constructed ocean trading ships with accommodations forward, though it is not common. Heavy-lift project cargo ships commonly use this design (see the common Lakes visitors in the fleet of BigLift Shipping).
Semi-submersible, heavy transport ships also commonly have accommodations (and machinery spaces) at the bow. These are the ships which "sink" down into the water, a load (another ship, project cargo, etc) is floated over the sunken part of the heavy-lift ship, and ballast pumped out to raise the ship out of the water. The Boskalis/Dockwise fleet is a primary example. Again, the large, uninterrupted deck space (with potential for cargo to overhang the rear) proves the accommodation forward design is beneficial.
Offshore oil exploration drillships also have accommodations forward, machinery spaces aft. This is so the ship's deck space can be used for the drilling and production machinery, with the forward accommodations designed for visibility of the navigation crew.
Offshore supply vessels use accommodation forward designs for more open deck space. Some "new" designs using an accommodation aft with traditional forecastle bow have been tried, but they are not catching on.
What all of those above generally have in common is diesel-electric propulsion. In this manner, the engine room can be placed anywhere, or at least with more freedom in design. The electric motors which drive the propellers, azimuth thrusters, or power the azipod propulsion units, are installed local to the unit (e.g. diesel engine generator up forward, electric drive motor aft in front of the propellor). In other cases, such as the BigLift ships, the engine rooms are located aft, so variations do exist.
The idea of extra cabling and machinery being a deciding factor is not always so clear. If the ship's designed trade proves a forward-located accommodation and bridge will be better, then the shipowner will specify it. The cost of extra machinery and steel is an additional cost, but not a dealbreaker and ongoing maintenance for the ship's life cycle is relatively minor. That said, the ultimate goal of shipbuilding is to do it as low cost as possible.
The above-noted ships are some examples of most ships with this design. That they are all specialized ships, engaging in niche trades. There is no justifiable reason to build a simple bulk carrier with forward accommodations as was done in the past, the same as oil tankers are no longer designed with an amidship accommodation/bridge. In this case, the cost/benefit does not offer any advantage to building a two-house, fore and aft ship.