Rocks & mirror

WÄRTSILÄ
Encyclopedia of Marine and Energy Technology

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Parallel mid-body

marine

The ship length for which the midship section is constant in area and shape.

Parallel Side Loader

marine

An innovative gantry-type shipboard crane developed by Wijnne & Barends for the handling of forest products and containers.

Parametric roll prevention system (IPRP)

marine

The anti-heeling system developed by the German company Intering™ to prevent the build-up of parametric rolling in head or following seas.

Parametric roll resonance

marine

A ship in longitudinal seas experiences a completely different shape of the underwater volume as compared with the ship in calm water and in beam seas.

Parametric rolling

marine

The stability moment of a ship is the product of the righting lever and the total weight. In head or following seas, the righting lever varies periodically due to the changing wave elevation around the ship and her pitch motion.

Parasitic element (electrical networks)

energy

In electrical networks, a parasitic element is a circuit element (resistance, inductance or capacitance) that is possessed by an electrical component but which it is not desirable for it to have for its intended purpose.

Parasitic load

energy

With regard to electricity production, parasitic loss it is any of the loads or devices powered by the generator, not contributing to net electric yield found by subtracting productive yield from gross yield.

Paravane

marine

Device used to achieve lateral separation for In-Sea Equipment towed from a seismic vessel.

Paris Agreement

energy

The Paris Agreement is an agreement within the United Nations Framework Convention on Climate Change (UNFCCC), on climate change mitigation, adaptation, and finance, signed in 2016.

Partial pressure

energy

In a mixture of gases, each constituent gas has a partial pressure which is the notional pressure of that constituent gas if it alone occupied the entire volume of the original mixture at the same temperature.

Partially weatertight hatch covers

marine

Hatch covers without sealing between comings and panels and with non-weatertight gaps between panels.

Particle accelerator

energy

A particle accelerator is a machine that uses electromagnetic fields to propel charged particles to very high speeds and energies, and to contain them in well-defined beams.

Particle physics

energy

Particle physics is a branch of physics that studies the nature of the particles that constitute matter and radiation.

Particulate matter

energy

Waste products from the combustion process that is emitted with flue gases, water and solids.

Particulates

energy

Particulates are microscopic particles of solid or liquid matter suspended in the air.

Particulates, particle matter (PM) emissions

marine

A complex mixture of inorganic and organic substances comprising mainly soot (elemental carbon), nitrates, carbonates and a variety of non, or partially, combusted hydrocarbon components of the fuel and lubricating oil.

Parts-per notation

energy

In science and engineering, the parts-per notation is a set of pseudo-units to describe small values of miscellaneous dimensionless quantities, e.g. mole fraction or mass fraction.

Pascal (unit)

energy

The pascal is the SI derived unit of pressure used to quantify internal pressure, stress, Young's modulus, and ultimate tensile strength.

Pascal's law

energy

Pascal's law or the principle of transmission of fluid-pressure) is a principle in fluid mechanics given by Blaise Pascal that states that a pressure change at any point in a confined incompressible fluid is transmitted throughout the fluid such that the same change occurs everywhere.

Passenger

marine

A person on board a vessel at sea who is neither the master, a member of the crew nor engaged in any way in the business of the ship. A child under one year of age is not considered to be a passenger.

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