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    Air Compressors in Construction: A Full Guide

    Air compressors are an essential aspect of the
    construction industry. You might be aware of them being used at construction
    sites for their high efficiency and output, but have you ever considered thinking about how air compressors actually
    work?

    Direct Air have developed an insightful
    infographic detailing how they operate and the different types of air compressors
    that are available to use. 

    Using Air Compressors in
    Construction

    Air compressors are integral to the
    construction industry as they power a vast amount of tools a worker needs. The
    great aspect about pneumatic drills is that they are relatively light and
    powerful to use, allowing great amounts of energy to be exerted.

    Compared to electric powered tools, pneumatic
    tools are safer to use and easier to maintain as there is not a risk of
    electrocution.

    Some of the most popular construction
    application use comes in the form of jackhammers, pneumatic picks, air guns and
    many more.

    It is important to emphasise the value of
    maintenance because failure to maintain tools regularly will lead to them
    deteriorating and not working properly.

    Low Noise Air Compressors

    Construction site managers need to think not
    only about the welfare of themselves but also of other fellow employees.

    Workers should wear ear protection to protect
    themselves from hearing damage. Anything above 85dB is considered to be harmful
    and likely to cause hearing issues.

    Air compressors can control and reduce noise
    levels, when generating power for equipment.

    While 60 dB is considered a safe level, there
    is no reason why you should not be able to reduce the noise levels even
    further.

    Low noise air compressors can decrease noise levels
    to around 40dB, of which this is accomplished through the addition of an
    acoustic chamber which function consists of containing the noise.

    An additional tip to help reduce noise levels
    would be to choose an electric-powered compressor, rather than a gas-powered
    machine.The electric compressor’s power source can make a machine generate less
    noise.

    Oil-free and Oil-based Air
    Compressors

    Lubrication is an aspect that should be
    reviewed when using an air compressor.

    Compressors that are oil-free already have a
    lubricated cylinder, mainly Teflon, thus ensuring no further maintenance is
    required.

    Oil-based compressors require manual work as
    oil needs to be added to the piston area frequently, and how much depends on
    the instructions provided in the manufacturer’s manual that came with the
    compressor.

    Oil-free compressors are lighter than
    oil-based compressors as the weight of the oil is not required and there are
    less parts to make them function.

    Furthermore, oil-free compressors tend to be
    more affordable than oil-based compressors and usually have a less complex
    design.

    Despite costing more, oil-based compressors
    are stronger and tend to have a longer lifespan than oil-free ones. Over time
    the material that is used for greasing, which is primarily Teflon, starts to
    wear out and endures a loss in its abilities of lubrication.

    In comparison to oil-based compressors,
    oil-free compressors heat up at a higher temperature and tend to make more
    noise.

    How do Single and Dual Phase
    Compressors Operate?

    For single phase compressors, compression
    occurs within a vacuum system by a single piston movement.

    The power is measured at a rate of PSI (pounds
    per square inch), of which the higher the PSI rate, the greater the power the
    compressor has.

    In a single phase compressor, the PSI rate is
    usually at 120. Once the air has been compressed, it then gets sent into a
    storage tank. 

    For Dual phase compressors, following the
    primary round of compression, air is dispelled into a second chamber at a rate
    of 175PSI, where the air gets compressed for a second time.

    The piston forces movement allowing
    compression to occur, as both types of compressors are usually powered by
    electric or power motors.

    Fixed and Variable Air
    Compressors

    Fixed speed air compressors send continuous
    streams of power into the motor.

    It’s great for certain industries where power
    demand is continuous. However, while being cost-effective, they are not energy
    efficient.

    Variable speed compressors automatically
    adjust the motor speed in conjunction with air demand.

    Power gets drawn into the convertor and
    converts AC power into DC power. A capacitor cleans the AC and converts it into
    DC using a transistor, acting as switches. This then ensures the power’s
    frequency is controlled that is distributed to the motor, thus also controlling
    the speed.

    Variable speed compressors are more power
    efficient as you can control the output of what you need, which means that if
    you were to use less power, money would be saved and it would be more
    beneficial for the environment.

    Unfortunately, maintenance repairs are
    frequent and there are higher capital costs. This compressor type is not
    recommended for machines that require streams of power that are continuous.

    Piston, Scroll and Rotary Screw
    Compressors

    Scroll compressors are a type of piston
    compressor, also known as reciprocating compressors.

    The piston travels downwards, following
    pressure in the cylinder being decreased which creates a vacuum. This pressure
    change causes the cylinder door to open and draw air in. The piston then
    travels back up forcing the air to be released from the cylinder at a higher
    pressure point.

    While they are able to cool down quickly and
    are energy efficient, they are harder to maintain and initial costs are high.

    Rotary screw compressors use rollers to
    compress air. These are positioned in the middle of the shaft and one side of
    the rollers are constantly in contact with the wall, and they rotate an extreme
    speed.

    Despite costing less, rotary screw compressors
    require frequent maintenance checks and cooling ability is quite limited.

    Overall Thoughts

    When choosing an air compressor that is needed
    for a particular job, there are vital aspects that need to be reviewed.

    Do you require air compressors for continuous
    use of industrial machinery or only occasional use?

    It is important to think about the budget
    because some compressors will be more cost-effective than others, and you need
    to consider how much maintenance work there will be in the future. Failure to
    maintain tools regularly will lead to them malfunctioning.

    With all of this taken into consideration, you
    should be able to make an informed decision on selecting the right air
    compressor for the required job, one of which is the most suitable for saving
    your company money and being energy efficient.