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EagleBurgmann Magnetic Couplings
Seal New Zero-leakage KSB
Refinery Pump
Jan 15, 2014 + + + KSB South Africa in cooperation with
EagleBurgmann specified high-efficiency magnetic couplings to seal the
shaft for the newly designed API 685 process pump. It was also decided to
use the couplings from the proven MAK685 series because they reliably
cover a broad application field in the higher pressure and performance
range.
The requirements for pumping hydrocarbons in petrochemical
plants and refineries are very high in terms of performance, efficiency,
and emission limits. An increasing number of process pumps with magnetic
couplings as per API685 are being used here. For several years
EagleBurgmann and KSB have been cooperating to design a magnetic coupling
pump. The new zero-leakage RPHmdp refinery pump stands for the experiences
of the KSB design engineers, EagleBurgmann's coordinated magnetic coupling
program, and the combination of an existing pump hydraulic with the
matching magnetic couplings.
The universal MAK modular concept for
pumps - for initial installation or retrofitting - is based on two proven
magnet variants, depending on the requirement: samarium-cobalt for
operating temperatures up to 300°C, and neodymium ferrum boron up to max.
120°C. As a result, the coupling size can be optimally adapted to the
required operating conditions and capacities.
Different
containment shell materials with the least electrical conductivity for
minimum eddy current losses are offered as well. A carbon fiber reinforced
PEEK containment shell is used for applications up to 120°C which
eliminates completely eddy currents and seals with a maximum degree of
efficiency. Due to the occurring loads, a metallic high-performance
containment shell with a laminated structure, which reduces eddy current
losses to a minimum, is used for more demanding applications up to 300°C
with higher speeds and pressures.
The magnetic couplings are
supplied with high-precision sliding bearings to securely bear the pump
shaft. The bearing absorbs the axial and radial forces of the impeller; an
effective product circulation in the interior of the magnetic coupling
ensures lubrication and heat dissipation and guarantees high operational
safety - even for low-viscosity media.
Bearings that can be cooled or
heated are also optionally available. The gas from problematic
gas-containing media is removed from the containment shell chamber by a
hollow shaft which consequently prevents the risk of the sliding bearings
from running dry.
An overview of the advantages
· Optimized
circulation guidance to improve the bearing load capacity and cooling of
the containment shell
· High-grade sliding bearing and magnetic
materials enable a wide range of use.
· No eddy current losses due to
carbon fiber reinforced PEEK containment shell and therefore no heating –
increased safety, especially for high speeds.
· Resistance to a great
number of aggressive media.
· Resistant to jolts caused by ductile
material properties.
· High pressure limit with 42 bar, in conformance
with the API 685 standard
Operating range
Torque: ... 1.879 Nm
(magnet material: NdFeB)
... 1.348 Nm (magnet material: SmCo)
Pressure: ... 45 bar
Temperature: -40°C ... +300°C
Rotational
speed: 3.600 rpm
Source: Ellen Klier - Eagle Burgmann -
www.eagleburgmann.com
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+49 (0)2903-338570
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www.sicking.de
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