Series MNK-B,
size 25-25-100
Page 10
9230-056-en
Revision 14
TM 9542
Edition 06/2016
5
Installation
5.1 Safety regulations
Equipment which is operated in potentially
explosive areas must satisfy the explosion
protection regulations.
People with a pacemaker are at risk from the
strong magnetic field of the magnetic drive. It
may be life-threatening for them to stay at a
distance of less than 500 mm to the pump.
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
firmly until the mortar has set.
Other possibilities of alignment are:
4-point-alignment
4-point-alignment 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 - motor
The following information is of a general
nature. If necessary, special notes of the
motor manufacturer are to be observed.
Prior to alignment work, loosen the screwing
901/6,
920/2
in the lantern. Align the unit with the housing
so that there is no tension and retighten the
screwing.
Use supports in the direct vicinity of the bolts
foundation/base plate.
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. 2
. The pump curve is provided by the
pump manufacturer. The pipe curve is determined
using diagrams or PC programs.
Fig. 1
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.
5.4.2 Nozzle loads
The pump can be subjected to nozzle loads in
accordance with ISO 5199.
Changes in the length of the piping caused by
temperature are to be allowed for by appropriate
measures, e.g. the installation of expansion joints.
v m s
Q m s
A m
3
2
( / ) =
(
/ )
(
)
