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2 – 7
Section 2 • Theory of Operation
HPLD Single Screw Compressor • Installation, Operation and Service Manual • Emerson • 35391HP
In most cases, the safety setpoints described above will
have settings which are dictated by process requirements,
and not necessarily mechanical constraints of the
compressor. Process pressures and temperatures may
vary considerably depending on the application of the
compressor, and the HPLD compressor is designed to
work well in a broad range of applications. For this reason,
it is impractical to suggest “initial” setpoints to fit all
applications. Instead, minimum and maximum values for
each safety setpoint are provided, while precise settings
for the safety setpoints must be derived for each
installation.
HPLD Package Requirements
Process Gas Circuit
1. Suction Gas Stop/Check Valve
- The HPLD compressor
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
TM
strongly recommends
the use of an in-line suction gas strainer to protect the
HPLD compressor from foreign material which may enter
the compressor with the suction gas. This strainer is
generally of stainless steel mesh construction.
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 or vertical 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 compressor
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 compressor
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 temperature
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 HPLD
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. If
needed, separate oil filtration can be available for bearings
and shaft seal.
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 installations,
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.
Содержание Vilter VSG128
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