Reciprocating and rotary screw are the two most common types of mobile air compressors used in Australian business. Both types appear to offer similar capabilities, however, the attributes of these compressors apply them to different applications. This article will compare reciprocating v rotary screw air compressors and hopefully help you when deciding between the two.

RECIPROCATING COMPRESSOR

Reciprocating compressors use a piston, which moves up and down inside the cylinder to compress the air. Air is sucked in when the piston moves down, and when the piston moves up, it increases pressure forcing the air out of the cylinder through a discharge chamber. Reciprocating compressors are ideal for short term or intermittent domestic industrial use and are used for a range of applications including:

• Sandblasting
• Air guns
• Automotive workshops
• Pneumatic tools

RECIPROCATING COMPRESSOR ADVANTAGES

• High power and pressure produced
• Lower initial capital investment
• Easier maintenance
• Convenient size and weight

RECIPROCATING COMPRESSOR DISADVANTAGES

• Higher ambient noise (dBA)
• High oil carryover
• Higher temperature

ROTARY SCREW COMPRESSOR

These compressors consist of two rotors within a casing where the rotors compress the air internally. There are no valves, and these units are oil cooled (with air-cooled or water-cooled oil coolers) where the oil seals the internal clearances. Since the cooling takes place right inside the compressor, the working parts never experience extreme operating temperatures. The rotary compressor, therefore, is a continuous duty, air cooled or water-cooled compressor package. These compressors are used in various industries which include:

• Food and beverage
• Oil and gas
• Mining
• Agriculture

ROTARY SCREW COMPRESSOR ADVANTAGES

• 100% Duty: Work longer creating constant high volumes of air pressure
• Higher overall efficiency due to lower energy consumption
• Lower ambient noise (dBA)
• Part load capacity control systems can match system demand

ROTARY SCREW COMPRESSOR DISADVANTAGES

• Highest cost upfront
• Requires medium to large usage rate
• Higher service cost

For more information or if you need help installing your air compressor, contact one of CAPS Australia’s experts on 1800 802 697 or send us an email at info@caps.com.au. CAPS 42 years of expertise in compressed air all around Australia guarantees a quality solution suited specifically for your business, which will perform for years to come.