Wilo Norma V Serie Notice De Montage Et De Mise En Service page 45

Pump can occasionally handle solids in the liquid but it will drive to
a reduction of pump lifetime, increasing of equipment noise and
absorbed power.
HYDRAULICS WITH CLOSED IMPELLERS :
Maximum fluid viscosity is 300 cSt (mm²/s), or 40°E.
Free passage depends on pump size :
PUMP SIZE
40-315
32-125 32-160B 40-160 32-200A/B 40-200 32-250 40-
250
50-250 50-315
125-315
40-125 50-125 65-125 32-160A 50-160 65-160 100-
160 50-200
65-200 80-200 100-200 65-250 80-250 100-250 125-
250 65-315
80-315 100-315 150-315 100-400 125-400 150-400
80-400
150-500 300-500
80-160 125-200 150-200 150-250 200-400 200-500
200-250 250-300 200-315 250-315 250-400 250-500
300-400
HYDRAULICS WITH SEMI-OPEN IMPELLERS :
Maximum fluid viscosity is 500 cSt (mm² ).
It is possible to pump fluids containing particles when pump is run at
1450 RPM with the following restrictions :
- Solid size smaller than 1 mm : 10% maxi in volume
- Light particles with smaller size than 1 mm : 35% maxi of the
volume without any change in fluid specific gravity.
Free passage depends on the pump size :
PUMP SIZE
32-20-200
32-20-160 40-25-250
40-25-125 100-80-125 40-25-160
50-32-125 50-32-160 40-25-200
65-40-125 50-32-200 50-32-250
80-50-125 65-40-250 50-32-315
65-40-200
65-40-160 80-50-160 125-100-160
100-65-200 65-40-315
125-100-200 80-50-250 80-50-315
100-65-160 80-50-200 100-65-250
100-65-315 100-65-400
125-80-315
125-100-250 150-125-250 150-125-315
200-150-315
125-80-400
200-150-400
150-125-400 200-150-250
5.2.3
wrong direction of rotation.
Ensure that the direction of rotation is correct before first start-up or if
maintenance work has been carried out on the electric power supply.
Max size
engraved in the pump.
(mm)
Check direction of rotation when motor is apart (coupling spacer
Ø2
dismantled or motor not coupled to pump). If not feasible due to pump
design (pump fitted with rigid coupling) it is necessary to check that
Ø3
pump shaft turns freely after the test and before final pump start.
Ø5
To check direction of rotation start motor briefly and check direction of
rotation just before rotation stops. If direction of rotation must be
modified then reverse two phases in motor junction box.
Ø6
starter connections. If this solution is preferred then it will be necessary
Ø7
to modify the identification of the cables in the electrical drawings too.
Ø10
5.2.4
Ø12
Ø14
Noise level of a complete pump set depends on motor type and speed,
Ø16 on quality and wear of flexible coupling (if concerned), on fluid velocity,
piping design, ... Values given hereafter are only indicative and based on
fan cooled electric motors average noise levels.
must be certified.
should wear hearing protections.
Motor speed 
Elec
Max
power
size
[KW]
(mm)
< 0,55
Ø5
0,75
1,1
Ø6
1,5
Ø7
2,2
Ø8
3
4
Ø9
5,5
Ø10
7,5
Ø10.5
11
15
Ø11
18,5
Ø12
22
Ø13
30
37
Ø14
45
Ø16
55
Ø18
75
90
Ø19
110
Ø20
150
Ø21
Indicative noise level given in dBA (LpA at 1 m)
Ø24
Ø25
DIRECTION OF ROTATIO N
Serious damage can result if the pump is started or run in the
Direction of rotation must correspond to the arrow attached or
It is possible to change two phases in the control cabinet on motor
NOISE LEVEL
The test must be perfomed on the supplied pump if the noise level
If noise level is higher than 85dBA, personel working in pump area
2900 RPM
motor
Pump Bare
set shaft

65 60
65 60
65 60
70 65
75 70
75 70
85 80
85 80
85 80
85 80
85 80
85 80
85 80
85 80
90 80
90 80
95 85
95 85
95 85
95 85
95 85
ENGLISH
1450 RPM
Pump Bare
set shaft
65 60
65 60
65 60
70 65
70 65
70 65
70 65
70 65
70 65
75 70
75 70
75 70
75 70
80 75
80 75
80 75
80 75
85 80
85 80
85 80
85 80
11