Emerson VSG & VSSG Spezifikationen PDF herunterladen (Seite 15)

100

Description

DESCRIPTION OF GAS SYSTEM FOR A STANDARD

COMPRESSOR SET

The gas passes through a stop valve and a check

valve and then through a mesh strainer mounted

directly to the inlet flange. The check valve is nec-

essary to prevent reverse rotation and potential

damage or oil loss at shut down. The suction gas

enters the compressor housing through the top inlet

flange, at the driven end of the unit.

After compression the gas is discharged from the

discharge manifold directly into a oil separator tank.

On the discharge of the oil separator tank another

check valve is positioned to prevent the entry of

gas or liquid refrigerant in to the separator when

the compressor is shut down. The separator should

be allowed to equalize slowly to suction pressure

through a small bypass line around the suction check

or combination stop/check valve. This will allow the

compressor to start without a pressure differential

across it, reducing the starting power requirements.

From the discharge manifold, the gas/oil exits the

compressor housing and passes into the oil sepa-

rator through a pipe elbow. The separator vessel

serves to separate the oil from the gas as the gas

stream moves from one end of the separator to

the other. The majority of the oil is separated from

the gas in the primary chamber of the vessel due to

changes in direction and velocity reduction. Any re-

maining oil mist is separated from the gas stream as

the stream passes through the coalescing elements

and into the secondary chamber of the vessel. The

gas at discharge pressure then exits at the far end

of the separator.

Oil collected in the bottom of the separator is

drained off to be recirculated in the oil injection

system. The injection oil temperature is controlled

by several means the first of which is a three-way

mixing valve, which mixes hot oil directly from the

separator with oil which has passed through the

oil cooler to obtain oil at the desired temperature.

This oil then passes through a filter to remove any

contaminants, which may have been picked up

from the process gas, and is injected back into the

compressor.

DESCRIPTION OF OIL SYSTEM FOR A STANDARD

COMPRESSOR SET

At start oil at is drawn from the oil separator tank by the

oil pump, and passes through a oil cooler and micronic

filters to the oil supply inlet on the compressor frame.

From there it internally lubricates all points internal to

the compressor. After start-up when the compressor

develops sufficient differential pressure the oil pump

can be shut down and the oiling can take place without

the use of the oil pump. On units with low pressure dif-

ferentials such as booster and low pressure differential

high stage compressors, the oil pump must remain on

whenever the unit is running to maintain sufficient oil

flow.

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