General Scope

R Series
R4-11
Point of Manufacture Campbellsville, Curitiba, Unicov
Detailed Scope
CCN: 47526638001
Sheet: 1 of 14
ECN: 967069
Revision: C
INGERSOLL RAND single stage (R4-11), contact cooled, rotary screw packaged air
compressor.
GENERAL PACKAGE DESCRIPTION:
The fully packaged contact cooled, rotary screw air compressor is designed for total
convenience, it is easy to install, simple to operate and will deliver rated compressed
air with reliable efficiency. The enclosure is designed to manage the environment of
the internal components and the cooling ventilation system, at the same time as
significantly reducing the sound level emitted from the machine into the installation
environment. The complete package is designed to be located on an adequate flat
floor without any special foundations and will operate without imparting significant
vibrations to the installation.
INLET AIR FILTER:
Inlet air filtration is accomplished by a large 99.9% efficient at 3 micron and above, dry
type air cleaner. This is more than suitable for the vast majority of applications:
however, where high dust and dirt contamination is present, optional enhanced
filtration systems are available.
COMPRESSION MODULE / AIR END:
Since the airend is the fundamental component in any rotary screw compressor
package, reliability, performance and efficiency are determined for the most part by
the design, manufacturing tolerances and assembly of the airend itself. All other
elements in the compressor system are essentially support and monitoring devices
included to ensure dependable service and performance.
The rotors are manufactured from AISI-1045 steel or EN 10083-2 C45+N steel. The
asymmetrical helical profile is developed through a unique two step machining
process. The first step in the machining process develops the basic wrap angle profile
and is a rough cut. The second and final step is a finish grinding process which
ensures a hard, true rotor surface. Rotor shafts are precision ground to tolerances
within 0.5mil or 0.0005 of an inch. The rotors are paired prior to assembly into the
rotor housing. The rotor housings are made of close grain high quality cast iron. After
machining the housing is dimensionally checked to ensure accuracy.
The bearing configuration used is back to back tapered roller bearing. The tapered
roller bearing essentially consists of constructing the roller elements, as well as the

Summary of content (14 pages)