GE Roots Centrifugal Compressors Brochure
GE Energy
Roots* Centrifugal Compressors
GE continues a history of innovation
and technical leadership
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GE Energy is a global leader in the design and
manufacture of air and gas handling solutions.
GE leverages its history of technical innovation to
address key environmental issues and to provide
current best practices in manufacturing to delivery
of its products to customers around the globe.
Here you will fi nd an overview of the engineering
quality and manufacturing expertise that comprises
Roots centrifugal compressors. This is followed by
a look at the three primary compressor models
we produce along with some characteristic
performance data and dimension information.
Then we close with a few words about control
systems, testing, repair services and global
aftermarket coverage.
Reliability
Finite Element Analysis
(FEA) and an extensive
history in compressor
design will help ensure
that we provide our
customers with a reliable
solution that will last well
into the future.
Performance
Computational Fluid
Dynamics (CFD) helps
ensure each compressor
is optimized for performance and effi ciency,
helping to reduce your
power requirements and
the cost over the operating
life of the compressor.
Function
Working hand-in-hand
with your engineers, we
can establish a design that
can be adopted into your
process. Solid (3D)
Modeling aids in visualizing
the compressor’s layout
and optimizing the
footprint while proving
fi t and function.
You
Our Design and
Application Engineers
will evaluate your
given conditions and
specifi cations to
determine a solution
that will perform and
comply to your specifi c
needs.
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Roots centrifugal compressors deliver high
IMPELLERS: Offered in many different designs and
constructions of several different materials, depending upon
the operating conditions and gas being handled. The impeller
is statically and dynamically balanced and then oversped to
15% above maximum operating speed. The impeller is then
Multi-Stage Rotor Assembly
Open Wheeled Rotor Assembly
mounted on the shaft with a suitable locking device and the
rotor assembly is dynamically balanced.
Closed Wheeled Rotor Assembly
Radial - Tilt Pad Bearing
Axial - Multi-Shoe Equalizing
Bearing
BEARINGS: Tilt Pad, Sleeve and Integral Squeeze Film Damper (ISFD)
type bearings are used in the radial (journal) orientation, while
Tapered Land and Multi-Shoe Equalizing are used in the axial
thrust) orientation. Bearing type is selected dependent upon
the compressor type.
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performance and low maintenance.
Standard Labyrinth
SEALS: Air applications use the Standard Labyrinth Seal, while Double
Labyrinth, Carbon Ring and Dry Mechanical Seals are used for gas
applications. Buffer and suction ports can be provided for additional
retention of the process gas. Gas-tight shutoff sealing is also available
to ensure gas retention when the compressor is not operating.
Buffered Labyrinth
LUBE OIL SYSTEM: Lube system can be provided in three different
confi gurations: integral, console mounted to the baseplate, and
console mounted off the baseplate. Each system will consist of a
main and auxiliary oil pump, oil cooler, oil fi lter, bypass valve for
temperature control, oil reservoir (minimum 3 minute retention),
and necessary safety switches and gauges.
Buffered Carbon Ring
Double Opposed Dry Gas
Seal w/ Buffer
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Roots IGCH Compressor
Integrally Geared Dual Vane
Characteristic Value
Flow, SCFM (Nm3/hr)
Polytrophic Head, ft*lbf/lbm (kJ/kg)
Casing Materials
Impeller Materials
Impeller Construction
Discharge Position
Spec. Compliance
Seal Arrangement
Vanes
Bearing Type
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4,000 to 42,000 (6,280 to 65,980)
10,000 to 40,000 (29.9 to 119.5)
Cast iron, ductile iron (special materials available upon request)
Carbon steel, stainless steel, titanium
Radial, semi-backward leaning and backward leaning blades
(open or closed);
Cast, welded, milled
45° increments, starting at 0° (UP) position
API 617, API 672
Labyrinth, carbon ring, mechanical
Variable or fi xed diffusers with variable axial inlet guide or variable
peripheral inlet guide
Journals: tilt pad & sleeve; thrust: tapered land
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