 Dresser-Rand
1101 Cavalier Blvd
Chesapeake, VA 23323
TEL: 757-494-3800
FAX: 757-487-9450
Proven OEM Design Upgraded To Current Efficiencies ISOPAC centrifugal compressors are field-proven
machines. featuring an OEM design, heavy-duty materials and a long history of reliability.
Now, Dresser-Rand offers high-efficiency, low maintenance remanufactured ISOPAC
centrifugal compressors that represent the most reliable and efficient equipment on the
market.
Competitively priced and delivered in a fraction of the standard turnaround time for new
units, these compressors are backed by a full new-unit warranty.
Existing ISOPAC units are easy to replace with remanufactured units since the footprint,
foundation and piping do not need to change. Also, in comparison to new units, the
remanufactured compressors are easily maintained due to the horizontally split case
design.
 1. IMPELLERS High-head, open-bladed impellers are cast from 17-4PH
stainless steel by the investment casting method. High efficiency impellers manufactured
by five axis milling from 17-4PH stainless steel blanks are available.
2. BEARINGS Precision thin-wall, steel-backed
babbitt-lined
bearings supported in a horizontally split bearing housing are used for the bull gear
shaft. Each bull gear bearing contains a Michell two-direction thrust bearing system. The
high-speed pinion shafts are supported in the original Clark design tilting pad bearings
which are carried in a horizontally split bearing housing. KMC Flexure Pivot™ tilt
pad bearings are also available. All bearing oil seals are of the labyrinth type.
3. GEAR CASE All gear cases are horizontally split at the
bull gear and pinion centerline for ease of maintenance. Ports provide easy visual
inspection of gearing above each pinion/bull gear mesh area. A. PINION SHAFT AND GEARS The
pinion shafts, including the gear, two-direction thrust collars, and impeller mounting
flanges, are machined from solid forgings. The shafts are dynamically balanced before
mounting the impellers and again after the impellers are in place. B. LABYRINTH SEALS Horizontally split
aluminum labyrinth shaft air seals are installed behind the impellers to provide a seal
between the compressor stage and the atmospheric port. The atmospheric port isolates the
pinion bearings from the compressor stage. A polymer seal is also available from
Dresser-Rand.
4. INTER-COOLER AND MOISTURE
SEPARATORS Inter-coolers and
moisture separators are provided between each stage of compression. Coolers are
shell-and-tube and constructed of copper or Admiralty tubes with aluminum fins. Stainless
steel moisture separator pads are located downstream of the inter-coolers to limit
moisture carry-over.
5. LUBE SYSTEM The lube system is completely piped and mounted on
the base to supply pressurized lube oil to the compressor bearings and gears and in some
cases, also the drive motor.
6. BASE The fabricated steel base on all sizes provides
support for the gear case and compressor assembly, main driver and lubricating system
components. The inter-coolers, moisture separators and lube oil reservoir are in the base.
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