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Air_Compressors_-_How_To_Choose_One

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					Title:
Air Compressors - How To Choose One

Word Count:
412

Summary:
There are three main types of air c
ompressors. Which you need will dep
end on the air pressure you need an
d how portable your compressor need
s to be.

Reciprocating compressors come in a
  range from 5 HP to 1000 HP. The sm
aller compressors are portable, som
etimes being mounted on wheels. The
se may be petrol driven or electric
ally powered. They compress air by
a series of pistons in cylinders. T
he pistons are driven by a camshaft
. Reciprocating compressors are oft
Keywords:Au...
en used in
compressor,compressors,air compresso
r,air compressors

 Article Body:
There are three main types of air c
ompressors. Which you need will dep
end on the air pressure you need an
d how portable your compressor need
s to be.

Reciprocating compressors come in a
  range from 5 HP to 1000 HP. The sm
aller compressors are portable, som
etimes being mounted on wheels. The
se may be petrol driven or electric
ally powered. They compress air by
a series of pistons in cylinders. T
he pistons are driven by a camshaft
. Reciprocating compressors are oft
en used in Auto Body Repair shops.

Larger reciprocating compressors ar
e gradually being replaced by simpl
er rotary screw compressors. A larg
e reciprocating compressor can disc
harge air at 35 Mpa, more than 5,00
0 psi.

If you are looking for a compressor
 for continuous use a rotary screw
compressor may be suitable. These c
ompressors use helical screws to co
mpress the gas into a smaller volum
e. Portable and fixed rotary screw
compressors are available. These co
mpressors vary in size from 5 HP to
 500 HP. You will find rotary screw
 compressors that give you a low pr
essure gas output, or a high pressu
re output, up to 8 Mpa. These compr
essors are used to power pneumatic
drills when workers are digging up
roads and pavements.

For continuous, heavy industrial us
es you need a centrifugal compresso
r. A centrifugal compressor uses a
rotating disk with vanes. Output fr
om centrifugal compressors can be a
s high as 70 Mpa, 10,000 psi. Snow
blowing machines use this type of c
ompressor. Superchargers and turboc
hargers in car engines are centrifu
gal compressors.

When you buy compressed air for div
ing the air has been compressed usi
ng a three stage, reciprocating com
pressor. The cylinders in the compr
essor are ceramic lined, so no lubr
ication is needed. This avoids the
air in the cylinders being contamin
ated with lubricating oil. If a non
-recommended lubricating oil is use
d it can undergo partial combustion
 and cause carbon monoxide to enter
the air cylinder.

The compressed air is filtered thro
ugh silica gel to remove water, the
n through activated charcoal to rem
ove any traces of oil.

Sometimes air from a cheap, low pow
ered compressor will be stored in a
 bank of large high pressure cylind
ers. Air from these cylinders is th
en used to quickly fill diving cyli
nders. The diving cylinders need to
 be filled slowly to prevent the co
mpressed air inside them from getti
ng hot. If the gas inside is hot, i
t will expand and the cylinder maxi
mum pressure will be reached with l
ess air inside. The gas cools and t
he cylinder may only be half full.

For valves check out http://www.valv
es-today.info.

				
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