03-reciprocating gas compressors 1.0
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Reciprocating GasCompressors
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100psi
10psi
Gas well Gas pipeline
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10psi
105psi
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Applications
for
Gas compressors
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Gas Injection
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Gas Lift
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Gas Gathering
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Coal Seam Gas Evacuation
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Gas Storage
open
open
closed
closed
Summer
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Gas Storage
closed
closed
open
open
Winter
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Gas Transmission
Station 1 Station 2
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WATER STEAM
Gas Turbine
Fuel Booster Co-generation (Co-gen)
application
GENERATOR TURBINE ENGINE
BOILER
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Larger diameter cylinders are for lower
pressures. Gas, at a lower pressure,
occupies more space.
The size of the cylinder is determined by the
pressure and quantity of the gas to be
compressed.
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Smaller diameter cylinders are for
higher pressures. Gas, at a higher
pressure, occupies less space.
The size of the cylinder is determined by the
pressure and quantity of the gas to be
compressed.
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CYLINDER BORE
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INLET VALVES
DISCHARGE VALVES
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Differential pressure opens
the inlet valves.
50 psi
45 psi
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Springs inside the valve
close the valve.
50 psi
50 psi
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Differential pressure holds
the inlet valve closed.
50 psi
105 psi
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100 psi
100 psi
Springs inside the valve
close the valve.
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45 psi
100 psi
Differential pressure holds
the discharge valves closed.
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Valve internals
SEAT PLATE
DAMPING PLATE
DAMPING SPRINGS
CLOSING SPRINGS
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What causes the pressure
changes in the cylinder bore?
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~ r (length of bore)2
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PISTON ROD PISTON
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PISTON ROD
OIL IN
VENT
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114.7 psiA
458.8 psiA
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80 F
320 F
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100
psig
2000
psig
Ex: Overall ratio, when considering absolute, is 17.56 : 1
1st stg= 100-283, 2nd stg= 283-760, 3rd stg= 760-2000(2.6 : 1) (2.6 : 1) (2.6 : 1)
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100 psi
444 psi
“?”
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vent and drain
connections
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C o m p r e s s o r
1 0 1
1 .
C o m p r e s s o r s a l
w a y s h a v e t h e s a m e s i z e c y l i n d e r s n o m a t t e r t h e a p p l i c a t i o n .
2 .
D i f f e r e n t i a l p r e s
s u r e o p e r a t e s t h e v a l v e s .
3 .
A s l o n g a s t h e r e
i s e n o u g h h o r s e p o w e r , a s
i n g l e s t a g e c o m p r e s s o r c a n b e u s e d f o r
a n y r a t i o .
4 .
E x c e s s i v e r a t i o a c r o s s a c y l i n d e r c a n r e s u l t i n e x c e s s i v e p i s t o n r o d l o
a d a n d
t e m p e r a t u r e i n c r e a s e .
5 .
T h e p u r p o s e o f a p i s t o n i s t o c h a n g e v o l u m
e w i t h i n t h e c y l i n d e r .
6 .
A c y l i n d e r c a n o
n l y b e o p e r a t e d a s d o u b l e
a c t i n g .
7 .
T h e p r i m a r y p u r p o s e o f t h e c o m p r e s s o r f r a
m e i s t o c o n v e r t r o t a t i n g m
o t i o n t o
r e c i p r o c a t i n g m o t i o
n .
8 .
A c y l i n d e r c a n b
e m a d e s i n g l e a c t i n g b y r e
m o v i n g a d i s c h a r g e v a l v e
o n o n e
c y l i n d e r e n d .
9 .
L a r g e c y l i n d e r s
a r e n o r m a l l y u s e d f o r h i g h
p r e s s u r e s
1 0 .
P i s t o n r i n g s a r e
a d d e d t o s e a l t h e c l e a r a n c
e b e t w e e n t h e p i s t o n a n d t
h e b o r e .
N a m e :
D a t e :
P e r c e n t a g e :
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C o m p r e s s o r
1 0 1
1 .
C o m p r e s s o r s a l w
a y s h a v e t h e s a m e s i z e c y
l i n d e r s n o m a t t e r t h e a p p l i c a t i o n .
F
2 .
D i f f e r e n t i a l p r e s s
u r e o p e r a t e s t h e v a l v e s .
T
3 .
A s l o n g a s t h e r e i s e n o u g h h o r s e p o w e r , a s i n g l e s t a g e c o m p r e s s o r c a n
b e u s e d f o r
a n y r a t i o .
F
4 .
E x c e s s i v e r a t i o a
c r o s s a c y l i n d e r c a n r e s u l t
i n e x c e s s i v e p i s t o n r o d l o a
d a n d
t e m p e r a t u r e i n c r e a s e .
T
5 .
T h e p u r p o s e o f a
p i s t o n i s t o c h a n g e v o l u m e w i t h i n t h e c y l i n d e r .
T
6 .
A c y l i n d e r c a n o n
l y b e o p e r a t e d a s d o u b l e a
c t i n g .
F
7 .
T h e p r i m a r y p u r p
o s e o f t h e c o m p r e s s o r f r a m e i s t o c o n v e r t r o t a t i n g m
o t i o n t o
r e c i p r o c a t i n g m o t i o n .
T
8 .
A c y l i n d e r c a n b e
m a d e s i n g l e a c t i n g b y r e m
o v i n g a d i s c h a r g e v a l v e o
n o n e
c y l i n d e r e n d .
F
9 .
L a r g e c y l i n d e r s a
r e n o r m a l l y u s e d f o r h i g h
p r e s s u r e s
F
1 0 .
P i s t o n r i n g s a r e a d d e d t o s e a l t h e c l e a r a n c e
b e t w e e n t h e p i s t o n a n d t h
e b o r e .
T