Purging with Dry Nitrogen

Section 4 • Operation

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.

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

PREPARATION

WARNING

When working with LFG, NG or other dangerous or flammable gases, ensure there are adequate ventilation and vapor detectors. Refer to national fire and building codes. Failure to comply may result in serious injury or death.

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.

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.

Discharge

Status

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.

Stop Button

Figure 4-7. PLC Main Screen

VSG/VSSG • Installation, Operation and Maintenance Manual •Vilter/Emerson • 35391SSG

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Emerson VSG, VSSG manual Purging with Dry Nitrogen, Operation