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VSG/VSSG • Installation, Operation and Maintenance Manual •Vilter/Emerson • 35391SSG
Purging with Dry Nitrogen
Purging is recommended if the compressor will be
inactive for 12 hours or more. For additional long
term storage information, refer to Long Term Storage
Recommendations in Section 3.
PREPARATION
WARNING
When working with LFG, NG or other dangerous
or fl ammable gases, ensure there are adequate
ventilation and vapor detectors. Refer to national fi re
and building codes. Failure to comply may result in
serious injury or death.
WARNING
When working pressured systems, always wear
safety glasses and/or face shield. Failure to comply
may result in serious injury.
1. Press “Stop” button to stop compressor unit, see
Figure 4-7.
2. If equipped with equalizing solenoid, allow pres-
sure in compressor unit to equalize to suction pres-
sure, see Figure 4-8.
3. If equipped with manual suction bypass valve and
it is not open, open suction bypass valve. Allow
pressure in compressor unit to equalize to suction
pressure.
Figure 4-7. PLC Main Screen
Stop Button
Discharge
Status
4. Close suction and discharge shut-off valves to
isolate the compressor unit from house system.
Lockout/tagout valves.
5. Slowly open suction oil charging valve to depres-
surize compressor unit to atmosphere, see Figure
4-8. Keep valve in open position.
NOTE
Plugs are installed on bleed valves. Remove and install
plugs prior to and after bleeding. Ensure to keep valves
closed when removing and installing plugs.
6. Open discharge bleed valve to allow nitrogen to
purge through compressor unit, see Figure 4-8.
7. Refer to PLC main screen for discharge pressure
when purging.
PURGE
CAUTION
Do not purge compressor unit with oxygen. Failure to
comply may result in damage to equipment.
CAUTION
Do not allow compressor to spin while purging.
Regulate purging pressure as needed. Failure to
comply may result in damage to equipment.
8. Connect purging hose from nitrogen cylinder to
suction oil charging valve.
Section 4 • Operation