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Ultrasonic Inspection: Compressors

Types of Compressors

• Reciprocating - Uses a reciprocating piston to draw air in through a valve and force the drawn air into a storage tank or through a smaller orifice. They are available with single or multiple cylinders, depending upon the pressure and volume required. Reciprocating compressors are referred to as positive displacement compressors.
• Rotary Screw - Two intermeshing helical rotars in a twin bore case are used to compress between one convex and one concave rotor. The trapped volume of air is decreased while the pressure is increased. Rotary screw compressors are referred to as positive displacement compressors.
• Centrifugal Compressor - Unlike the reciprocating and rotary screw compressors, centrifugal compressors do not make use of positive displacement. Air or gas enters the center of rotation of an element and is forced outward. The element can use curved blades, radial blades, or backward blades. The acceleration of the air causes the pressure to rise.

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