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Procedure -
1. Close dryer inlet & outlet isolation valves, valve nos. V1 and V6.
Note: Bypass valve V7 may be opened if the process flow is required during
regeneration. Moisture will not be removed while bypass valve is open.
2. Close filter isolation valves, valve nos. V2 and V5.
3. Open regeneration loop isolation valves V3 & V4. Verify valve V11 is closed.
4. Reduce pressure to 10 PSIG by slowly opening valve V12 (located on the
separator sump tank). Shut valve V12 when it reaches 10 PSIG. If operating
pressure is lower than required regeneration pressure, open valve (supplied by
others) from high pressure source to regeneration loop.
CAUTION: make sure the drain is vented to a safe location.
5. Turn "DRYER POWER" switch ON.
6. To start regeneration, press F3 key to clear alarms. Press F1 key and enter 4 digit
regen code. Then press and hold F1 key on the operator display terminal. When
dryer starts, verify that the blower is operating; cooler fan motor is in operation, i.e.
drawing air across the cooling fins; and regeneration heater is energized by
observing a gradual temperature rise on thermometer TI-4.
7. The approximate regeneration heating time is 6 hours. The correct regeneration
inlet temperature to the desiccant chamber is between 375°F to 425°F. The
desired regeneration outlet temperature is approx. 200°F to 300°F. The heating
time may require extension based on water load and ambient conditions to
achieve these desired temperatures. To minimize energy usage and thermal
aging of desiccant, a thermocouple (TE-2) located on vessel outlet is used to
sense when desiccant moisture adsorption is below design. Setpoint can be
optimized based on actual operating conditions but is recommended @ 250°F.
8. The approximate cooling time is 4 hours. At the end of cooling, TI-2 temperatures
in the range of 100°F to 120°F are acceptable.
9. When regeneration is complete close valves V3 and V4.
sump tank by opening valve V12. Close valve V12 when all liquid has been
drained. Verify bypass valve V7 is closed.
waiting until the line reaches operating pressure before opening the next valve in
the sequence. To return the dryer into service slowly open valve V6.
IMPORTANT:
cooling cycle liquid condensate will form in the separator and be stored in
the separator sump tank. Be sure that flexible drain hose "free drains" (no
traps) to sump tank from separator.
10. Turn "DRYER POWER" switch OFF.
NG-SR IOM
Refer to Flow Diagram in section VII.
During the heating cycle and approximately one-hour into the
Open valves V1, V2 and V5 slowly
30
Drain liquid from the
PSB INDUSTRIES
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