4 Description of the Pump (Set)
19 of 96
Magnochem-Bloc
but also dissipates heat losses caused by eddy currents in the metal containment
shroud wall. If a ceramic containment shroud is used, no eddy current losses will be
induced in the containment shroud wall. (
4.6 Operating modes
The operating mode defines the route the cooling and lubricating flow takes
through the magnetic coupling. Depending on the operating mode, the cooling and
lubricating flow is routed differently through the magnetic coupling. A distinction is
made between the following operating modes:
▪
Operating mode: internal circulation
In internal circulation operating mode, the fluid handled is used to lubricate the
plain bearings and to dissipate the heat generated by the magnetic coupling. The
difference in pressure results in a lubricating and cooling flow from the suction
to the pressure side. The fluid flows through bores provided in the casing cover
on the pressure side and returns to the suction side through an axial shaft bore.
▪
Operating mode: external circulation
In external circulation operating mode, the fluid used to lubricate the plain
bearings and to dissipate the heat generated by the magnetic coupling is fed
into the pump from outside (either from the discharge nozzle with or without a
main flow filter, or from an external fluid supply in the plant). Either the fluid
handled or another fluid can be used. With the external circulation variant, the
lubricating and cooling flow is fed into the pump via auxiliary connections at the
casing cover and flows back to the suction side via an axial shaft bore.
▪
Operating mode: low-boiling fluids
In low-boiling fluids operating mode, the fluid handled is used to lubricate the
plain bearings and to dissipate the heat generated by the magnetic coupling. The
lubricating and cooling flow is ensured by an integrated auxiliary impeller. The
fluid flows through bores provided in the casing cover on the pressure side and is
returned to the pressure side through bores in the casing cover. This operating
mode is particularly suitable for fluids which have a steep vapour pressure curve.
▪
Operating mode: dead end configuration
In dead-end configuration operating mode, either the fluid handled or an
external fluid is used to lubricate the plain bearings and to dissipate the heat
generated by the magnetic coupling. The lubricating and cooling flow is ensured
by an integrated auxiliary impeller in an almost closed circuit between the
magnetic coupling and a heat exchanger; the latter ensures that the heat
generated by the magnetic coupling is dissipated. The liquid flows into and out
of the pump via auxiliary connections at the casing cover. If pressurised barrier
fluid is used, a flow from the magnetic coupling to the main impeller is possible
but a return flow back to the magnetic coupling prevented.
4.7 Noise characteristics
Table 6:
Surface sound pressure level L
pA
2)3)
Rated power input P
N
[kW]
Pump
Pump set
960 rpm
760 rpm
[dB]
1450 rpm
[dB]
2900 rpm
[dB]
960 rpm
760 rpm
[dB]
1450 rpm
[dB]
2900 rpm
[dB]
1,5
52
53
54
56
58
63
2,2
53
55
56
58
60
66
3
55
56
57
60
62
68
4
56
58
59
61
63
69
5,5
58
59
61
62
65
71
7,5
59
61
62
64
66
72
2)
Spatial average; as per ISO 3744 and EN 12639; valid for pump operation in the Q/Qopt = 0.8 - 1.1 range and for non-
cavitating operation. If noise levels are to be guaranteed: Add +3 dB for measuring and constructional tolerance.
3)
Increase for 60 Hz operation: 3500 rpm +3 dB, 1750 rpm +1 dB, 1160 rpm ±0 dB
Summary of Contents for Magnochem-Bloc
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