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

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.

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

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.

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.

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

A piston is a component of reciprocating engines, reciprocating pumps, gas compressors, hydraulic cylinders and pneumatic cylinders, among other similar mechanisms.

A piping and instrumentation diagram (P&ID) is a detailed diagram in the process industry which shows the piping and process equipment together with the instrumentation and control devices.

Piping is a system of pipes used to convey fluids (liquids and gases) from one location to another.

Pipeline transport is the long-distance transportation of a liquid or gas through a system of pipes—a pipeline—typically to a market area for consumption.

A pilot valve is a small valve that controls a limited-flow control feed to a separate piloted valve.

Pilot operated relief valves (PORV) are used for emergency relief during overpressure events

Typical construction process for a wind turbine sub-sea monopile foundation in sand.

In pipeline transportation, pigging is the practice of using pipeline inspection gauges, devices generally referred to as pigs or scrapers, to perform various maintenance operations.

Uses the piezoresistive effect of bonded or formed strain gauges to detect strain due to applied pressure.

The Sensor is generally a temperature compensated, piezoresistive silicon pressure sensor chosen for its excellent performance and long-term stability.

A piezometer is either a device used to measure liquid pressure in a system by measuring the height to which a column of the liquid rises against gravity, or a device which measures the pressure (more precisely, the piezometric head) of groundwater at a specific point.

A proportional–integral–derivative controller (PID controller or three-term controller) is a control loop mechanism employing feedback that is widely used in industrial control systems and a variety of other applications requiring continuously modulated control.

Vapor-dominated sites offer temperatures from 240 to 300 °C that produce superheated steam.

In vapor-absorption chillers technology, thermal energy is used to produce cooling instead of mechanical energy.