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Compressed air is air kept under a pressure that is greater than atmospheric pressure. It serves many domestic and industrial purposes.

In Europe, 10 percent of all industrial electricity consumption is to produce compressed air-amounting to 80 terawatt hours consumption per year

In industry, compressed air is so widely used that it is often regarded as the fourth utility, after electricity, natural gas and water. However, compressed air is more expensive than the other three utilities when evaluated on a per unit energy delivered basis.[3]

Compressed air is used for many purposes, including:

Pneumatics, the use of pressurized gases to do work
Pneumatic post, using capsules to move paper and small goods through tubes.
Air tools
HVAC control systems
Vehicle propulsion (see compressed air vehicle)
Energy storage (see compressed air energy storage)
Air brakes, including:
railway braking systems
road vehicle braking systems
Scuba diving, for breathing and to inflate buoyancy devices
Refrigeration using a vortex tube
Air-start systems in engines
Ammunition propulsion in:
Air guns
Airsoft equipment
Paintball equipment

The header piping up to the air dryers is exposed to moist, hot air (temperatures can reach well over 150 degrees F). Copper, stainless steel and other piping materials that are less corrosive are recommended. If plain carbon steel piping is installed, then rust particles can pass downstream and interfere with the operation of condensate valves and wye strainers. The riser piping should connect to the top of the header piping and be one pipe size larger than the compressor discharge piping and/or overhead header piping. A drip leg with a drain is needed to prevent water from flowing back to the compressor. Mount valves in the highest horizontal piping (this avoids the hazard of opening a closed valve in vertical piping, and releasing trapped condensate to flow back into air compressors). All of the header main compressed air piping should slope 1/8" to 1/4" per foot down and away from the point of origin. Gravity and airflow will then carry condensate to the low points where a drop leg should be installed to allow for removal at accessible drop legs and drain points. These drops should be installed every 50 to 70 feet in the system and be taken from the bottom of the main line to insure as much removal as possible.

The inlet piping for air dryer(s) should connect to the bottom of the piping headers.