Emerson VSG, VSSG manual Purging with Dry Gas, Operation, Pressure Indicator, Oil Separator

Section 4 • Operation

Purging with Dry Gas NOTICE

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 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.

WARNING

When working pressured systems, always wear safety glasses and/or face shield. Failure to comply may result in serious injury.

To purge the compressor unit using a dry gas (i.e. methane), a purge line must be installed. If there is not enough purge pressure, connect purge line to a lower pressure line or to atmosphere. The purge line, associated valves and gauges are not provided from the

factory and must be installed by the customer.

1.Refer to Figure 4-10 for recommended purge line design.

2.Press “Stop” button to stop compressor unit, see Figure 4-11.

3.If equipped with equalizing solenoid, allow pres- sure in compressor unit to equalize to suction pres- sure, see Figure 4-12.

4.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.

5.Close suction and discharge shut-off valves to isolate the compressor unit from house system. Lockout/tagout valves.

To Lower Pressure Line or		PI	Pressure Indicator
Atmosphere. See NOTICE.		002
			Shut-off Valve
	Check Valve
Shut-off Valve
	Drain Valve

		PI
		002
	PURGE LINE
SUCTION INLET		DRAIN
		PRESSURE EQUALIZING LINE
	OIL RETURN LINE
	COALESCING	FG
		001

						DISCHARGE OUTLET
					TE
					002
OIL CHARGE						REMOTE
PT	001	004
001	TE	TE
BLEED					OIL COOLER
MOTOR				COMPRESSOR	TE
					007	VENT
		PT
		002			QE
					007
		BLEED
		OIL SEPARATOR					TE
						DRAIN	003
	LG
	001
		LG
		002
TE	1000W	1000W	QE	1000W
	QE	QE
005	101	102	103	DRAIN

Figure 4-10. Customer Purge Line

VSG/VSSG • Installation, Operation and Maintenance Manual •Vilter/Emerson • 35391SSG 4 – 11