Approximate Values When Using Pulsation Dampers - Grundfos DMH 251 Installation And Operating Instructions Manual

9.4 Approximate values when using pulsation
dampers
Risk of damage to the system!
It is always recommended to use pulsation
dampers for large high-speed pumps!
In particular for pump types with a flow rate
above 1000 l/h (DMH 257), suction and discharge
pulsation dampers should be used directly at the
Caution
pump suction and discharge ports of the pump.
The size of the suction and discharge lines
should be adjusted accordingly.
Since the pulsation is influenced by many
factors, a system-specific calculation is
essential. Request a calculation from our
calculation program.
The table below indicates the approximate values and the suction
line length for which suction pulsation dampers are required. The
values apply to 50 Hz operation when water or similar liquids are
dosed.
Stroke rate
Pump type
[n/min]
DMH 251
DMH 2.4-10 14
DMH 5-10 29
DMH 13-10 63
DMH 19-10 96
DMH 24-10 120
DMH 2.3-16 14
DMH 4.9-16 29
DMH 12-16 63
DMH 18-16 96
DMH 23-16 120
DMH 2.2-25 14
DMH 4.5-25 29
DMH 11-25 63
DMH 17-25 96
DMH 21-25 120
DMH 252
DMH 11-10 29
DMH 24-10 63
DMH 37-10 96
DMH 46-10 120
DMH 10-16 29
DMH 23-16 63
DMH 36-16 96
DMH 45-16 120
DMH 54-16 144
DMH 253
DMH 21-10 29
DMH 43-10 63
DMH 67-10 96
DMH 83-10 120
DMH 100-10 144
20
Maximum
Nominal
length of
width of
suction line
suction line
[m]
DN 8 8
DN 8 8
DN 8 3
DN 8 1.5
DN 8 1
DN 8 8
DN 8 8
DN 8 3
DN 8 1.5
DN 8 1
DN 8 8
DN 8 8
DN 8 3
DN 8 1.5
DN 8 1
DN 8 8
DN 8 2
DN 8 1
DN 8 1
DN 8 8
DN 8 2
DN 8 1
DN 8 1
DN 8 1
DN 20 8
DN 20 8
DN 20 6
DN 20 4
DN 20 3
Stroke rate
Pump type
[n/min]
DMH 254
DMH 50-10 26
DMH 102-10 54
DMH 143-10 75
DMH 175-10 92
DMH 213-10 112
DMH 291-10 153
DMH 46-16 26
DMH 97-16 54
DMH 136-16 75
DMH 166-16 92
DMH 202-16 112
DMH 276-16 153
DMH 255
DMH 194-10 54
DMH 270-10 75
DMH 332-10 92
DMH 403-10 112
DMH 550-10 153
DMH 257
DMH 220-10 28
DMH 440-10 56
DMH 575-10 73
DMH 750-4 73
DMH 770-10 98
DMH 880-10 112
DMH 1150-10 146
DMH 1500-4 146
Maximum
Nominal
length of
width of
suction line
suction line
[m]
DN 20 8
DN 20 8
DN 20 5
DN 20 3
DN 20 1.5
DN 20 1
DN 20 8
DN 20 8
DN 20 5
DN 20 3
DN 20 1.5
DN 20 1
DN 20 5
DN 20 3
DN 20 1.5
DN 20 1
DN 20 1.5
DN 32 4.5
DN 32 4.5
DN 32 3
DN 32 1.5
DN 32 1.5
DN 32 1
DN 32 0.5
DN 32 0.5