Great Lakes Air Products GPS-500 Gebruiksaanwijzing - Pagina 11

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Ambient & Air Inlet
The capacity of a compressed air dryer is a combination of four operating conditions, flow, pressure,
temperature, and saturation. These parameters are commonly specified as SCFM at 100 PSIG,
100°F, and 100% saturated. When a system deviates from these standard parameters, the load on
the compressed air dryer changes. Elevated inlet temperature increases the moisture holding capacity
of each cubic foot of air entering the dryer. Reduced inlet pressures increases actual volume and
reduces the effectiveness of desiccant adsorption system. Changes in either of these conditions from
the standard design results in changes to efficiency and capacity of the compressed air dryer.
Flow Correction: The following chart offers multipliers that can be applied to your system flow rate to
calculate required dryer capacity at actual field conditions.
80
70
0.75
80
0.67
90
0.60
95
0.58
100
0.55
110
0.51
115
0.49
120
0.47
125
0.45
150
0.38
Identify the compressed air inlet temperature to the dryer; if it is above 100°F and the system was not
designed for high inlet temperatures, it is most likely overloaded. Be sure to carefully identify the air
temperature, as 110°F can feel just warm through a steel pipe.
Identify the ambient operating conditions. If the unit is in ambient conditions above, 110°F Dewpoint
then operational efficiencies will suffer. Ambient temperatures at 120°F and higher will seriously
impair the dryer's adsorption capacity.
Valve Integrity
Most of the valves on a regenerative dryer act to separate the high-pressure process-drying stream
from the low/atmospheric pressure regeneration system. By performing the following diagnosis, it is
possible to identify valve bypass and the severity of that bypass without even taking the unit out of
service.
Identify which tower/muffler is purging. Turn the purge control valve (Located between the tanks in
the purge piping) off completely. Check the muffler to see if the purge flow has stopped. If it has
stopped, half of the valves on the dryer are in good shape. If a small amount of air can be felt, then a
valve seat is leaking and needs to be repaired as soon as possible. If large amounts of air are
present, a valve has failed and immediate attention is required. Return the purge valve to the original
operating set points.
At this point, you have checked out half of the valves on the machine. In order to check the other half,
you will need to wait for the unit to switch towers so the process can be repeated on the other side of
the dryer. If you have a leak, it will be one of three points. They are listed in order of failure
probability. The only way to specifically identify which valve is failing requires depressurizing the unit;
removing the valves and inspecting them.
1.
The front purge check valve above the opposite tank that is purging.
2.
The back outlet check valve above the regeneration tank.
3.
The inlet valve on the side of the tower that is regenerating. This valve is rarely the culprit. If
it is, you will most likely find air leaking out of the valve casting at a vent point indicating the
diaphragm has ruptured. The less likely option of a complete valve seizure is possible.
Dryer Inlet Temperature in °F
90
100
1.01
1.35
0.90
1.21
0.82
1.09
0.79
1.05
0.75
1
0.69
0.92
0.66
0.88
0.64
0.85
0.61
0.82
0.52
0.69
GPS Heatless Regenerative
Page 11 of 14
105
110
1.54
1.78
1.38
1.60
1.24
1.44
1.20
1.39
1.14
1.32
1.05
1.21
1.00
1.16
0.97
1.12
0.93
1.08
0.79
0.91
115
120
2.04
2.36
1.83
2.12
1.65
1.91
1.59
1.84
1.51
1.75
1.39
1.61
1.33
1.54
1.28
1.49
1.24
1.43
1.04
1.21