Rocks & mirror
WÄRTSILÄ
Encyclopedia of Marine and Energy Technology

P

423 results

POWER-SAVING DEVICES

marine

Schneekluth wake equalizing duct - The propulsion improving device, especially for full block ships, developed by Professor Schneekluth.

Power-system automation

energy

Power-system automation is the act of automatically controlling the power system via instrumentation and control devices.

Power-to-gas

energy

A technology that uses electrical power to produce a gaseous fuel.

Power-to-weight ratio

energy

Power-to-weight ratio is a calculation commonly applied to engines and mobile power sources to enable the comparison of one unit or design to another. Power-to-weight ratio is a measurement of actual performance of any engine or power source.

PPE

energy

The purpose of personal protective equipment is to reduce employee exposure to hazards when engineering controls and administrative controls are not feasible or effective to reduce these risks to acceptable levels.

Precipitation

energy

In meteorology, precipitation is any product of the condensation of atmospheric water vapor that falls under gravitational pull from clouds.

Precipitation fouling

energy

Scaling or precipitation fouling involves crystallization of solid salts, oxides, and hydroxides from solutions. Precipitation fouling is a very common problem in boilers and heat exchangers operating with hard water and often results in limescale.

Predictive maintenance

energy

Predictive maintenance techniques are designed to help determine the condition of in-service equipment in order to estimate when maintenance should be performed.

Prefabrication

energy

A method used to fabricate modules in a facility prior to being transported to the construction site.

Preferential tripping

marine

The use of automatic switches to trip or disconnect non-essential loads from the switchboard in the event of overload.

Preheat

marine

Preheat is used primarily to slow the cooling rate of a welded component in order to reduce the shrinkage stresses, prevent hardening and loss in ductility. It may be applied by propane gas torch.

Pre-ignition

energy

Pre-ignition (or preignition) in a spark-ignition engine is a technically different phenomenon from engine knocking, and describes the event wherein the air/fuel mixture in the cylinder ignites before the spark plug fires.

Preoutfitting

marine

The installation of both outfit and machinery items in large structural assembly units prior to these units being erected in the ship.

Pre-preg

energy

Pre-preg is a composite material made from "pre-impregnated" fibers and a partially cured polymer matrix, such as epoxy or phenolic resin, or even thermoplastic mixed with liquid rubbers or resins.

Pressure

energy

Pressure is the force applied perpendicular to the surface of an object per unit area over which that force is distributed.

Pressure chambers

marine

Pressure chambers are installed on board diving support vessels. Divers are accommodated inside, observed, medically checked and supplied.

Pressure charging

marine

Increasing the density of the air charge usually accomplished on diesel engines by the use of exhaust gas turborcharging.

Pressure drop

energy

Pressure drop is defined as the difference in total pressure between two points of a fluid carrying network.

Pressure head

energy

In fluid mechanics, pressure head is the height of a liquid column that corresponds to a particular pressure exerted by the liquid column on the base of its container.

Pressure sensor

energy

A pressure sensor is a device for pressure measurement of gases or liquids.

Download the Encyclopedia