SIEMENS
FLENDER Standard Couplings
Torsionally rigid all-steel couplings — N-ARPEX ARN-6 series
General
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Siemens MD 10.1 N · 04/2017
6
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Overview
Couplings suitable for use in potentially explosive
atmospheres.
Compliant with the current ATEX directive for:
II 2G c IIC TX
-50 °C
T
a
+260 °C X
II 2D c TX
-50 °C
T
a
+260 °C X
I M2 c TX
-50 °C
T
a
+150 °C X
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Benefits
N-ARPEX ARN-6 series couplings are outstanding for their appli-
cation-optimized construction. Types NEN, BEB, and MCECM
meet the requirements of
API 610
. Couplings designed accord-
ing to API 671 are also possible.
At speeds above 1800 rpm, the 5-part design with preassem-
bled intermediate unit is used.
A special fly-away prevention secures the intermediate spacer if
a plate breaks. The use of the N-ARPEX coupling is permitted in
potentially explosive atmospheres according to the current
ATEX directive
.
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Application
The N-ARPEX couplings of the ARN-6 series are used wherever
reliable torque transmission is required despite unavoidable dis-
placements of the shafts. They can be used universally in a tem-
perature range of -50 °C (use down to -60 °C on request) up to
+280 °C, are torsionally rigid, free of torsional backlash, and per-
mit smooth running at a constant angular velocity. They are not
subject to wear, are maintenance-free, and an unlimited service
life can be expected if they are properly mounted.
They are particularly suitable for use in pump and compressor
drives. Couplings with standardized intermediate spacer
lengths are available for this that can be supplied from stock
(see tables below).
Main applications of the ARN-6 series:
• Pumps
• Fans
• Compressors
•
Generator and turbine drives
•
Axial and radial blowers
•
Paper making and printing machines
•
Mixers, agitators
• Extruders
•
Hoisting gear and running gear
•
Marine drives
•
Water screw drives
With the introduction of the new FLENDER N-ARPEX all-steel
disk coupling, Siemens is writing a further chapter in the ongoing
success story of the proven ARPEX coupling series.
An optimized plate pack and a revised component design
enable transmission of even greater torques and speeds.
All in all, the new design of the plate packs, the enclosed flange
geometry, the standard fly-away prevention of the intermediate
spacer, and the FEM-optimized power distribution within the all-
steel disk coupling clearly show that the development has been
worthwhile.
© Siemens AG 2017