Emerson VSG Installation Manual download pdf (Page 23)

2 – 1

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

Section 2 • Theory of Operation

The gas and oil systems work in unison, but each one will

be explained separately. Reference Figure 2-1 for gas and

oil ﬂ ow descriptions.

Gas Flow

The gas compression process begins as processed gas

enters the suction inlet (1). The processed gas ﬂ ows

through a stop valve (2), check valve (3) then through

a suction line strainer (4) to the compressor (13). The

processed gas is then pressurized through the compres-

sor and discharged as high pressure gas vapor into the

oil separator (12). In the oil separator, the oil is then

separated from the discharged gas vapor by impinge-

ment separation. The high pressure gas ﬂ ows out to

the aftercooler and scrubber for cooling while the oil is

pumped or syphoned back to the compressor.

Check valves (3) and (6) are provided to stop the back

ﬂ ow of gas in the system when the compressor is shut

down.

An equalizing line is also installed between the high

pressure side (oil separator) and low pressure side (suc-

tion) to allow separator pressure to equalize to suction

pressure at shutdown. This is controlled by the equaliz-

ing solenoid (5).

Oil Life and Oil Flow

The life of the oil is directly affected by the quality of the

OIL SEPARATOR

OPTIONAL DUAL OIL FILTERS

STANDARD SINGLE

OIL FILTER

COMPRESSOR

FILTER

DRAIN

BLEED

FILTER

BLEED

DRAIN

BLEED

SUCTION GAS

1/4” OIL CHARGING

1/4”

100#

DISCHARGE

STOP VALVE

MOTOR

BLEED

MOTOR

PUMP

CHECK

VALVE

BLEED

OPTIONAL REMOTE AIR COOLED OIL COOLER

STANDARD WATER COOLED OIL COOLER

OIL COOLER

DRAIN

VENT

OIL

DRAIN

Figure 2-1. Gas Compressor Unit P&ID

1 2 3 4

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 111 112

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