Rocks & mirror

WÄRTSILÄ
Encyclopedia of Marine and Energy Technology

D

348 results

Daily load fluctuations

energy

Changes in electricity demand through a normal day.

Dalton's law

energy

Dalton's law (also called Dalton's law of partial pressures) states that in a mixture of non-reacting gases, the total pressure exerted is equal to the sum of the partial pressures of the individual gases.

Dam

energy

A dam is a barrier that stops or restricts the flow of water or underground streams. Hydropower is often used in conjunction with dams to generate electricity.

Dam failure

energy

A dam failure or dam burst is a catastrophic type of failure characterized by the sudden, rapid, and uncontrolled release of impounded water or the likelihood of such an uncontrolled release.

Dam removal

energy

Dam removal is the process of demolishing a dam, returning water flow to the river.

Damage Consequence Diagram (DCD)

marine

A practical method of presenting the impact of damage on the ship’s stability developed for passenger vessels by Three Quays Marine Service.

Damage Control Information (DCI)

marine

The Damage Control Information is a part of onboard documentation. The documentation should be clear and easy to understand.

Damage Control Manual

marine

The main purpose of this document is to stipulate appropriate action in the case of the hull damage. It should contain the following parts:

Damage control team

marine

A group of crewmembers trained for fighting flooding in the vessel.

Damage penetration zone, damage zone

marine

The zone of the ship where the stipulated damage can be assumed. The stipulated damage is defined in the applicable damage stability requirements.

Damage stability

marine

Stability of a flooded ship. When water runs into a ship following an accident, different scenarios can take place.

Damage stability calculations

marine

Calculations of stability of damaged ship are complicated and tedious. At present, two different analysis concepts are applied: the deterministic concept and the probabilistic concept.

Damage survey

marine

Occasional surveys which are requested as a result of hull damage or other defects. The damages may result from grounding, collision, heavy weather, contact damage, etc.

Damage Survivability Information (DSI)

marine

An analysis of different damage scenarios for standard loading conditions. In the event of damage to a ship, an assessment of the exact impact of the damage on the vessel’s stability is quite difficult.

Damage to the environment

marine

Substantial physical damage to human health or to marine life or resources in coastal or inland waters, or areas adjacent thereto, caused by pollution, contamination, fire, explosion or similar disasters.

Dammed valleys

energy

A dam constructed in a valley relies on the natural topography to provide most of the basin of the reservoir.

Damper

marine

1. A hinged flap used to control gas flow, e.g. fire damper in an air trunk. 2. An energy-dissipating device which reduces the amplitude of certain vibration, e.g. axial vibration damper or torsional vibration damper.

Damping

marine

The process, which dissipates the energy of a vibrating system in order to reduce the amplitude of the vibration or oscillation.

Dangerous area

marine

An area on a tanker, which, for the purpose of installation and use of electrical equipment, is regarded as dangerous.

Dangerous good manifest

marine

A special list of dangerous goods on board and their location.

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