Rocks & mirror
WÄRTSILÄ
Encyclopedia of Marine and Energy Technology

P

423 results

Piston pump

energy

A piston pump is a type of positive displacement pump where the high-pressure seal reciprocates with the piston.

Piston ring

marine

A rectangular cross-section ring of cast iron which is cut to enable fitting over a piston. The ring fits into a groove and creates a gas tight fit of the piston when moving up and down in the cylinder.

Piston rod

energy

In a piston engine, a piston rod joins a piston to the crosshead and thus to the connecting rod that drives the crankshaft or (for steam locomotives) the driving wheels.

Piston skirt

marine

A thin cylinder of material fitted at the bottom end of a piston. It serves to close the ports in a two-stroke engine.

Pit Storage

energy

Lined shallow pits (heat source) filled with gravel and water that are then covered with a layer of insulation and then soil so the area can be used for agricultural purposes.

Pitch bearing

energy

A component of modern wind turbines which connect the rotor hub and the rotor blade.

Pitch control

energy

Part of a wind turbine that controls the angle of attack of the turbine blades to control the turbine speed to prevent overspeed in high wind situations.

Pitch regulated wind turbine

energy

Pitch regulation thus allows the wind turbine to actively change the angle of attack of the air on the blades.

Pitquard anode

marine

A sacrificial anode placed just above the tank bottom in order to mitigate the general and pitting corrosion process.

PlanetSolar

energy

The world's largest solar-powered boat and in 2012 the first ever solar electric vehicle to circumnavigate the globe.

Planking

marine

Wood covering for decks, etc.

Planned maintenance

energy

Planned maintenance is a scheduled service visit carried out by a competent and suitable person to ensure that an item of equipment is operating correctly and to therefore avoid any unscheduled breakdown and downtime.

Planning craft

marine

The vehicle with the hull suitably shaped to develop the hydrodynamic forces during forward motion, sufficient to support the craft with a substantial proportion of the hull out of the water.

Planning terminal

marine

The bridge workstation, remote from the operational area of the bridge, which allows for the planning of routes and preparation of user-defined charts and radar maps.

Plant baseload

energy

The minimum power source continually supplied on a daily basis.

Plant efficiency (%)

energy

Approximate efficiency at generator without pumps based on ISO 3046 conditions and 5% tolerances.

Plant fast start time(min)

energy

Start time based on hot standby (preheated to a higher temperature or operated in the last 6 hours).

Plant fast stop

energy

Time it takes to decrease output from 100% to 0%, disconnect from grid.

Plant load following

energy

The ability of a power plant to vary its output depending on the load required.

Plant low load operation

energy

Operation when load is too low or no revenue is being generated.

Download the Encyclopedia