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

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.

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

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.

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

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

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

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

Wood covering for decks, etc.

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.

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.

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.

The minimum power source continually supplied on a daily basis.

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

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

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

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

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