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XII.
MAINTENANCE PROGRAM
Daily –
Weekly -
Weekly -
Monthly -
Monthly -
Six Months -
Six Months -
1 yr/250 hrs - Check oil level using blower maintenance procedure shown below.
2 years -
5 yr/1000 hrs - Change oil in blower.
Blower Maintenance Procedure
1. Remove power from unit; Isolate regeneration loop from process and
depressurize.
2. Remove studs and nuts from flange assembly on blower housing
3. Remove blower housing hold-down bolt and pull housing until blower is
accessible.
4. Oil level in the oil sumps at each end of the blower should be at the middle
of the sight gauges. Initial factory fill of oil is with Roots synthetic lubricating
oil ISO-VG-220. Ambient temperature 32° to 90°F.
5. Reinstall blower assembly in reverse order. Use new spiral wound type
gasket when bolting flange up to housing to prevent leaks.
6. Perform leak check and purge procedures before placing into service.
Filter Element Replacement Procedure
1. Isolate the filter by closing block valves on either side of filter.
2. Depressurize the filter housing slowly using drain valve at filter bottom.
3. Unscrew housing or unbolt top access closure and replace filter element.
4. Reinstall housing and purge the housing of air by opening one block valve
and drain valve at filter bottom.
DDP Monthly Maintenance Procedure
1. Isolate sensor sample cell by closing valves on either side.
2. Disconnect electrical connector and remove from sample cell.
3. Reconnect electrical connector and monitor moisture reading. Reading
should rise to near ambient dewpoint within 10 minutes.
4. Reinstall sensor into sample cell and attach electrical connector to sensor.
5. Open sample cell valves. It will take time for moisture level to return to
previous reading.
NG-SR IOM
Check outlet dewpoint when gas is flowing for reading below
-40°F. Make sure that V6 has been closed slightly to ensure
proper gas flow over sensor.
Drain pre-filter, blower housing and sump.
Check differential pressure across pre-filter and after-filter
elements. Replace if required when gauge is approaching RED
zone or 3-5 PSID.
Check and maintain operating conditions; pressure, flow,
temperature within the design parameters of the dryer.
Verify dew point (if instrument available). Remove sensor from
sample cell and verify instrument responds to ambient moisture
condition.
Recalibrate/check span of moisture analyzer. Refer to Xentaur
manual for details.
Replace pre-filter, after filter and separator elements.
Replace or regenerate desiccant if exit moisture exceeds
requirement.
33
PSB INDUSTRIES
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