- Maintenance
and wear and tear : In
piston compressors, the wear and tear is greater due to a large number of
moving parts. This results in more maintenance compared to a rotary screw
processor. However, because of the simple mechanical setup of a piston
compressor, it is easier to maintain and fix, despite the greater
frequency of maintenance required.
- Operating temperature, noise and vibration
: Typically,
a rotary compressor has lower operating temperatures than piston compressors. Friction is the lead cause for this, because the rotors in
the screw compressor don’t come in contact, whereas piston rings are in
constant contact with the cylinder walls, creating greater friction and
raising temperatures. The former also generates less noise and vibrates
lesser than the latter due to the same reason.
- Air flow and operation time : Because
of the high temperatures in a piston type compressor, it cannot be run
non-stop due to the risk of overheating. Furthermore it is also typically
run at only 50% of its total CFM or air flow capacity. The rotary screw
compressor, however, is capable of being run continuously. You can also
purchase a rotary screw compressor that is rated as close as possible to
your required air flow capacity rather than one rated at double the
capacity.
- Space required and energy efficiency : Since
rotary screws are encased next to one another in one chamber, the whole
setup usually takes up less space than a piston compressor which requires
cylinder heads for the vertical movement of the pistons. The former are
also more energy efficient than the latter with fewer transmission losses
as well. However, the effects are only discernable in compressors of 20 HP
or more horsepower.
- Pressure ratio and volume : The
compression range is much greater on a piston configuration when compared
to a rotary screw type. There is also more flexibility in terms of
pressure ratio and capacity. However, in rotary compressors, while the
flexibility is limited, the comparative volume capacity is much greater
than that of reciprocating air compressors.
- Oil carry-over : Piston compressors typically discharge more oil into the stream of compressed air
than rotary screw compressors do. Due to the high-friction moving parts,
wear-and-tear leads to more oil carry-over than in rotary screw compressors.
- Price : Due
to the above mentioned factors, the cost of a piston compressor is a lot
lesser than that of a rotary screw compressor.
Now that you know the major differences between the
two type of compressors – piston and rotary, and what advantages and
disadvantages either brings to the table, you can make an informed investment.
Before you decide either way, make sure to check out some great deals and one
of the widest ranges of compressors available at our online store. If you have
more questions, our air
compressor experts at Compressor
World will be more than happy to help you out.
More details visit us our website :
www.aircompressorindia.com
No comments:
Post a Comment