Emerson VSG & VSSG Specifications download pdf (Page 12)

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VSG Package Requirements

Process Gas Circuit

1. Suction Gas Stop/Check Valve - The VSG com-

pressor requires a manually operated stop valve on the

suction line to the compressor to allow for isolating the

compressor package from process gas. Also, a check valve

is required in the suction line to limit reverse rotation of

the compressor on shutdown.

2. Suction Line Strainer - Vilter strongly recom-

mends the use of an inline suction gas strainer to protect

the VSG compressor from foreign material which may

enter the compressor with the suction gas. This strainer

is generally of stainless steel mesh construction. Vilter can

provide assistance in designing a strainer housing specifi-

cally suited to VSG applications.

3. Process Gas/Oil Separator - A separator vessel

capable of removing the oil from the discharge gas stream

with an efficiency down to at least 5 PPM oil carryover is

required. Vilter’s own available horizontal separator is an

ASME-coded vessel which uses five stages of separation to

achieve an oil loss of as little as 3 to 4 PPM.

4. Discharge Gas Relief Valve - To protect the com-

pressor package from damage due to over pressurization,

a relief valve must be installed inside of any discharge line

hand block valves. The relief valve must be set to open at

a pressure lower than the Maximum Allowable Working

Pressure (MAWP) of the separator.

5. Oil Prelube Pump - Usually a direct driven gear

type pump, the oil pump is required to prelube the compres-

sor prior to starting and to maintain oil pressure during any

periods of low compression ratio operation.

6. Oil Cooler/ Temperature Control Valve - An oil

cooler, either air or water cooled, must be used to remove

the heat of compression from the oil stream. A tempera-

ture control valve is used to maintain constant oil injection

temperature to the compressor.

7. Oil Filtration - Large capacity micronic oil filters

are required to filter the oil before injection into the VSG

compressor. Filtration down to 25 microns nominal or less

is generally acceptable. Dual filters are recommended to

allow replacement of one cartridge while the compressor

continues running with the other cartridge in service.

8. Oil Heater - An oil heater is generally required

and must be sized to maintain oil temperature of at least

90°F when the compressor is not running. For outdoor in-

stallations, low ambient temperatures and winds must be

considered when sizing the oil heater. Also, insulating the

separator and oil piping may be required in low temperature

ambient conditions.

Note - Because the oil system on the VSG compressor utilizes discharge gas pressure as the means to move the

injection oil through the system, it must be remembered that all components of the oil system are exposed to full discharge

pressure and must be pressure rated accordingly.

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Emerson VSG & VSSG Specifications Page 12

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