Setup and connection
5.4.2 Sp ecifying nominal diameters
Keep the flow resistance in the pipes as low as possible.
1. Make sure the nominal suction pipe diameter is ≥ as pos-
sible to the nominal suction branch diameter.
– Recommended flowratespeed<1m/s
2. Make sure the nominal pressure pipe diameter is ≥ as pos-
sible to the no minal outle t flange diameter.
– Recommended flowratespeed<3m/s
5.4.3 Specifying pipe lengths
A
C
Fig. 11 Straight pipe lengths upstream and downstream
of the pump (recommended)
A > 5 x nominal pressure pipe diameter
B Nominal pressure pipe diameter
C Nominal suction pipe diameter
D > 5 x nominal suction pip e diameter
Maintain the recommended minimum va lues when
installing the pump.
Suction side: shorter pipes are possible but may restrict
the hydraulic perfor mance.
Pressure side: shorter pipes are possible b ut can result in
increased operating noise.
5.4.4 Optimizing changes in cross-section and
direction
1. Avoid bending radii of less than 1.5 times the nominal pipe
diameter.
2. Avoid abrupt change s of cross-se ction along th e piping.
5.4.5 Discha rging leaks
WARNING
Risk of injury and poisoning due to hazardous pumped
liquids!
Safely collect any leaking pumped liquid, then discharge
and dispose of it in accordance with en vironmental regula-
tions.
1. Provide equipment for c ollecting and discharging leaking
liquids.
2. Ensure the free discharge of leaking l iquids.
5.4.6 Pro viding safety and c ontrol devices
(recommended)
Avoiding reverse running
Install a non-return valve between the outlet flange and the
stop valve to ensure the medium does not flow back when
thepumpisswitchedoff.
Making provisions for isolating and shutting off pipes
For maintenance and repair work.
Provide shut-off devices in the suction an d pressure lines.
Allowing measurement of the operating conditions
1. Provide pressure gauges for pressure measurements in
the suction and pressure lines.
2. Provide for pu mp-side temperature measurements.
Providing dry-running protection
Provide suitable dry protection to protect the pump against
dry r unning and resulting damage:
– Select dry protection according to the speci fic applica-
tion.
– Select dry protection in co nsultation with the manufac-
turer.
Avoiding high pressures
To switch off the pump at high pressures, provi de suitable
shutdown devices, f or example, a pressure switch.
18 AE BA-2020.05 en-US 260371 – 176-982/0
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