Installation and connection
5.3.4
Determine the pipe lengths and installation
parameters
A
D
Fig. 4
Pipe lengths and installation parameters
A DNs
B
≥
0.5 m
C
≥
1.5 x DNs
D DNd
E > 5 x DNd
Observe recommended minimum values when installing
the pump.
Pressure side: Shorter lengths are possible, but may result
in increased noise development.
5.3.5
Optimizing changes of cross section and
direction
1. Avoid radii of curvature of less than 1.5 times the nominal
pipe diameter.
2. Avoid abrupt changes of cross-section along the piping.
5.3.6
Providing safety and control devices
(recommended)
Avoid contamination
Install a dirt strainer with mesh size <3 mm at the inlet of
the suction pipe.
Avoid reverse running
1. Install a foot valve or check valve between the pressure-
side flange and shut-off valve to ensure that the medium
does not flow back after the pump is switched off.
2. In order to enable venting, include vent connection
between the pressure-side flange and foot valve or check
valve.
Make provisions for isolating and shutting off the pipes
For maintenance and repair work.
Provide shut-off valves in the suction pipe and pressure
line.
Dry run protection by measuring the operating conditions
Provide monitoring sensors for both pressure and flow rate,
to protect the pump against dry running and
consequential damage.
5.4
Connecting the pipes
NOTE
Material damage due to excessive forces and torques on
the pump!
Ensure pipe connection without stress.
5.4.1
Keeping the piping clean
NOTE
Material damage due to impurities in the pump!
Make sure no impurities can enter the pump.
Clean all piping parts and fittings prior to assembly.
5.4.2
Installing suction pipe
1. Remove the transport and sealing covers from the pump.
2. Fit suction pipe stress-free and sealed.
3. Avoid gas cavities:
–
Always lay the suction pipe rising.
–
Do not install bends with an angle
≤
90°.
–
Do not install the suction pipe near whirlpools or supply
lines.
5.4.3
Installing the pressure pipe
1. Remove the transport and sealing covers from the pump.
2. Position the pressure-side flange facing upwards, so as to
allow the pump head to be vented.
3. Fit the pressure line stress-free and sealed.
4. Install the foot valve under the following operating condi-
tions:
–
The outlet of the suction pipe is at least 10 m above the
tank fill level height
–
Differential head > 15 m
5.4.4
Inspection for stress-free pipe connections
Piping installed and cooled down
1. Disconnect the pipe connections from the pump.
2. Check whether the pipes can be moved freely in all direc-
tions within the expected range of expansion.
3. Make sure that the connections are parallel.
4. Reconnect the pipe connections to the pump.
12
SMP
11335/0320
