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 Dresser-Rand
Company stands for compressor leadership. Every type, for every
industry, on every continent-that's the Dresser-Rand heritage.
Axi compressors boldly continue that tradition, proving
themselves day in and day out by handling the really difficult
uses in the chemical, petrochemical, oil and gas production,
refining, and heavy industry markets.
The Best Compressors for
Difficult Applications
Applications
- Dirty gases
- Oil-free compression
- Corrosive gases
- Gases with entrained liquids
- Low molecular weight gases
- Widely-varying operating conditions
Broad Product Ranges
- Capacities to 35,000 inlet cfm
- Single- and multi-stage
- Vacuum or pressure (dry or wet)
Variety of Materials of
Construction for Corrosive and Erosive Applications
- Cast iron
- Nodular iron
- Ni-resist
- Carbon steel
- Stainless steels
- Coatings
Axi Compressor Operation
Unlike straight-lobe blower compressors, Axi compressors
provide internal compression, as described below, achieving
significantly higher efficiency while requiring less power to
operate.
- Gas enters the intake ports and is drawn into a pocket
created between the rotors and the
casing wall.
The pocket-now full of gas-rotates away from the intake
and is ready to join its mating helical pocket.
Then, as the lobes and grooves
roll into each other, the mating
pockets merge and begin to shorten. Thus, the gas
trapped inside is compressed as it is forced axially-towards
the discharge end.
As it continues its journey, the gas is further compressed
until it is pushed through the
discharge ports.
Inside the Axi Compressor: A
Cross-section of Reliability
Filtered oil is force-fed (on most Type L Axi sizes) to all
gears and bearings by a shaft-driven gear pump. When required,
an oil cooler is supplied. (Size 450L and 762L Axi compressors
lave splash lubrication.)
 A
variety of seal configurations are available to keep oil out of
the compression chamber.
On the Type "L" Axi units, heavy-duty anti-friction
bearings are carried in individual precision-made cartridges for
easy removal. Perfect rotor alignment is restored when the
cartridges are replaced.
Helical rotors are precision-machined and fitted in
perfectly-mating pairs. The rotors are short and rigid,
permitting the Axi to handle higher pressure differentials and
employ higher-speed, lower-cost drivers.
Quiet helical timing gears synchronize the rotor and maintain
close clearances. They transmit only 10 percent of input torque,
so wear is negligible.
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