Requirements For Operation - Andritz SM Serie Instructions De Service

Series SM
As a general rule, the suitability and materials selection for the
motors should be checked by the purchaser based on water
analyses or chemical analyses. If desired, this can also be done
in cooperation with the motor manufacturer. The purchaser
bears responsibility for selecting the correct materials.
The motors may only be used in media explicitly approved
in the contract documentation!
2.1.3 Impermissible media
Under no circumstances may the submersible motors be used
in other media,
• and especially not to pump air, explosive media or waste-
water.
• Motors made of corrosion-resistant materials are available for
use in aggressive media.
The purchaser bears responsibility for selecting the correct
materials.
2.1.4 Coolant temperature and velocity
The heat generated during operation is transmitted through the
motor shroud and any installed heat exchangers and into the
surrounding media flow.
Depending on the flow velocity and the expected sediments
on the motor shroud, the maximum coolant temperature
defined for that operating condition may not be exceeded. Oth-
erwise optimal cooling cannot be ensured.
Information on these values are generally provided in the sup-
plied contract documentation.
For standard motors, please see the appendix to these instruc-
tions for guide value tables with the maximum permissible
coolant temperatures depending on various operating condi-
tions.
The recommended coolant velocity is at least > 0.5 m/s along
the motor.
If you do not find the information you need, or if something is
unclear, please consult the motor manufacturer.
Operation with higher media temperatures or lower flow
velocities is only permitted after consultation with the
manufacturer, or if it is explicitly noted in the contract doc-
umentation. Otherwise this may lead to overheating and
damage to the motor.
2.1.5 Cooling shroud
If it is not possible to achieve the required minimum velocity of
the coolant, e.g. if the inlet of the well is above the motor, or if
the well has a very large diameter, then a cooling shroud is nec-
essary. This should encase the entire motor and the water inlet
of the pump in such a way that that forced cooling of the motor
is ensured (see Figure 1).
The coolant velocity can be calculated based on the well diam-
eter and the delivery rate of the pump.
Calculating the flow velocity:
Q x 353 68
V =
2
D
V = flow velocity
Q = delivery rate [m³/h]
D = well diameter [mm]
d = motor diameter [mm]
2.2

Requirements for operation

• The maximum submersion depth under the surface of the
water must not exceed 350 m.
• Greater submersion depths on request.
• The maximum permissible frequency of operations of the
motor may not be exceeded. A defined pause must be ob-
served before switching on again. Otherwise overheating
and damage to the winding will occur!
The following table shows the applicable values for frequen-
cy of operations and pauses:
Frequency of
Type operations
[Operations per h]
SM8
SM8T, SM8F,
SM8FT
SM9, SM9T,
SM9F, SM9FT
SM10, SM10T,
SM10F, SM10FT
SM12, SM12T,
SM12F, SM12FT
SM14, SM14T,
SM14F, SM14FT
Table 1: Frequency of operations and pauses
• The heat generated by the motor during operation is
transmitted to the medium being pumped via the surface of
the motor. Operation in media where there is a danger of sed-
iments is only permissible if this has been allowed for in the
contract documentation.
Figure 1: Cooling shroud
,
[ ]
m s /
2
- d
Pause
[min]
15 2
10 2
8 3
8 3
8 3
4 5
15