Series SCK, Size 25-25-100
Page 11
9220-003-en
Revision 14
TM 10272
Edition 01/2021
5
Installation
5.1 Safety regulations
Equipment which is operated in potentially
explosive areas must satisfy the explosion
protection regulations.
5.2 Installation of pump/unit
The structural work must be prepared in accordance
with the dimensions in the installation drawing.
Method of installation: on a grouted base plate and
firm foundation
Align base plate on the ground foundation.
Insert foundation bolts and grout base plate.
Do not tighten the foundation bolts uniformly and firm-
ly until the mortar has set.
Other possibilities of installing the pump are:
4-point installation
4-point installation with base plate.
As soon as additional installations are
mounted, the stability of the entire unit
installed without a foundation must be
checked.
5.3 Alignment of pump-coupling-
motor
The following information is of a general
nature. If necessary, special notes of the
coupling and motor manufacturer are to be
observed.
After attachment of the base plate on the
foundation and connection of the pipes, the
alignment of the coupling must be carefully
checked and, if necessary, the unit re-
aligned with the motor.
A coupling check and possible re-alignment is also
necessary if the pump and motor are supplied on a
common base plate and aligned.
Prior to alignment undo the support bracket
183
and
then tighten it without stress.
The pump is to be aligned in all directions using a
spirit level (on shaft/discharge nozzle) (admissible
position deviation max. 0.08” in/ft (0,2
mm/m). See
installation drawing.
Use supports in the direct vicinity of the bolts founda-
tion/base plate.
Ensure that the unit cannot be started
during work without the coupling guard.
5.4 Piping
Before the pump is installed, both, the suction and
supply lines as well as the discharge line are to be
cleaned.
Dirt or damage to the sealing surfaces is best avoided
if the flange covers remain on the flanges until just
before installation.
Use flange gaskets suitable for the medium.
The screw tightening torques in
Section 1.1
are to be
observed for tightening the flange screws.
5.4.1 Nominal size
The operating design point of a centrifugal pump lies
at the intersection of the pump curve and the pipe
curve, see Fig. 6. The pump curve is provided by the
pump manufacturer. The pipe curve is determined
using diagrams or PC programs.
Fig. 2
Under no circumstances can the nominal size of the
piping be derived from the connected nominal size of
the pump.
The pipe nominal size can also be determined using
the flow rate as a rough guide.
The velocity in the suction line should not exceed 2.0
m/s and 5.0 m/s in the discharge line.
When determining the suction line nominal size, the
NPSH value (net positive suction head) must also be
observed. The NPSHR value required for the pump is
specified in the data sheet.
The NPSHR available in the plant
should be at least 0.5 m higher than
the NPSHR required for the pump.
Otherwise, this will lead to a drop in
the delivery head, cavitation or even
failure of the pump.
)
m
(
A
)
s
/
m
(
Q
)
s
/
m
(
v
2
3
=
