Application guidelines
To ensure the successful operation of the VSSG/VSG com-
pressor, the guidelines described below should be followed.
Proper lubrication is critical to the operation of the VSSG/
VSG compressor. The compressor relies on the injected oil
to absorb and remove the heat of compression, to seal the
compression chambers formed in the flutes of the screw,
and to lubricate all moving parts. For this reason, it is
imperative that the oil chosen be of correct viscosity, and
that sufficient oil flow be provided at all times, using an
auxiliary oil pump when necessary. The oil chosen must be
compatible with the process gas, to prevent absorption of
the gas into the oil, which would dilute the oil and reduce
the viscosity. Also oil filtration to 25 micron nominal
particle size is required to ensure that only clean oil is
injected into the compressor. For assistance in choosing
the correct oil for the application and in sizing an auxiliary
oil pump, consult a Vilter representative.
Injection oil temperature must be closely controlled for
optimum performance. Oil temperature must be maintained
a minimum of 15 - 20°F above the gas mixture dewpoint at
anytime to prevent condensation or liquid knockout from
occurring within the compressor.
Gas composition plays a role in the performance of the
VSSG/VSG compressor as well. While the VSSG/VSG is
capable of handling a wide variety of gases, if H
2
S is present
in the process gas in any concentration, special oil additives
are required to protect the compressor from corrosion.
Levels below 100 PPM of H
2
S allow the standard warranty
to apply.
Typical gases handled: Natural gas, landfill gas, carbon
dioxide, propane, helium, propylene and ammonia.
Other gases will need to be reviewed for compatibility
and operational performance by Vilter.
VSG compressor capacity and design limitations - standard models
Description
VSG
301
VSG
361
VSG
401
VSG
501
VSG
601
VSG
701
VSG
751
VSG
901
VSG
791
VSG
891
VSG
1051
VSG
1201
VSG
1301
VSG
1551
VSG
1851
VSG
2101
VSG
2401
VSG
2601
VSG
2801
VSG
3001
Rotor diameter (mm) 205 240 280 310 312 350 401 401
Gaterotor diameter (mm) 195 205 216 225 240 252 268 280 289 300 298 310 312 331 350 368 388 400 411 416
Max. HP 3600 RPM* 300 HP 500 HP 675 HP 2000 HP 675 HP 1000 HP 2000 HP
Max. allowable torque (ft. lbs.) 444 739 998 2958 998 1479 2958
Rotor speed (RPM) 1200-4200 1200-4000 1200-3800
Direction of rotation
CCW facing
drive end
CW facing
drive end
CCW facing drive end
Drive type Direct drive, electric motor, gas engine
Built-in volume ratio 1.2 to 7.0 (Continuously variable automatic, or manual control)
Capacity range 10% to 100% (Continuously variable automatic, or manual control)
Bare comp. MAWP (psig)** 515 485 1100 485 535
Max. pressure differential
(psig)***
325
Min. inlet temp. (°F) -50°F
Max. inlet temp. (°F) 180°F
Max. disch. temp. (°F) 225° (Contact Vilter for increased temperature limits)
Max. oil temp. (°F) 190° (Contact Vilter for increased temperature limits)
*Higher limits are available. Consult Vilter Manuafacturing LLC.
**Higher discharge pressures are achievable. Consult Vilter Manuafacturing LLC. for approval.
***Higher differential pressures can be achieved. Consult Vilter Manuafacturing LLC. for approval.
Note: MAWP (Maximum Allowable Working Pressure). The relief valve setting must be below the MAWP. The relief valve is usually set 10% lower than the MAWP.
(44 pages)
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