Inlet Pressure And Counter-Pressure/Suction Lift - Grundfos DMH 25X Manual De Instrucciones

Pump type
Single pump Double pump
DMH 254
DMH 50-10 DMH 50-10/50-10
DMH 102-10 DMH 102-10/102-10
DMH 143-10 DMH 143-10/143-10
DMH 175-10 DMH 175-10/175-10
DMH 213-10 DMH 213-10/213-10
DMH 291-10 DMH 291-10/291-10
DMH 46-16 DMH 46-16/46-16
DMH 97-16 DMH 97-16/97-16
DMH 136-16 DMH 136-16/136-16
DMH 166-16 DMH 166-16/166-16
DMH 202-16 DMH 202-16/202-16
DMH 276-16 DMH 276-16/276-16
DMH 255
DMH 194-10 DMH 194-10/194-10
DMH 270-10 DMH 270-10/270-10
DMH 332-10 DMH 332-10/332-10
DMH 403-10 DMH 403-10/403-10
DMH 550-10 DMH 550-10/550-10
DMH 257
DMH 220-10 DMH 220-10/220-10
DMH 440-10 DMH 440-10/440-10
DMH 575-10 DMH 575-10/575-10
DMH 750-4 DMH 750-4/750-4
DMH 770-10 DMH 770-10/770-10
DMH 880-10 DMH 880-10/880-10
DMH 1150-10 DMH 1150-10/1150-10
DMH 1500-4 DMH 1500-4/1500-4
* l/h per dosing head; double the capacity for double pumps.
The pump can be operated in the range between 10
Note
% and 100 % of the maximum dosing capacity.
3.4.1 Accuracy
• Dosing flow fluctuation: smaller than ± 1.5 % within the control
range 10-100 %
• Linearity deviation: ± 2 % of the full-scale value.
Applies to:
• water as dosing medium
• fully deaerated dosing head
• standard pump version.

3.4.2 Inlet pressure and counter-pressure/suction lift

Maximum inlet pressure
Pump type
DMH 251
DMH 252
DMH 253
DMH 254
DMH 255
DMH 257
10
50 Hz
Max.
Q* p max. stroke
rate
[l/h] [bar] [n/min]
50 10 26
102 10 54
143 10 75
175 10 92
213 10 112
291 10 153
46 16 26
97 16 54
136 16 75
166 16 92
202 16 112
276 16 153
194 10 54
270 10 75
332 10 92
403 10 112
550 10 153
220 10 28
440 10 56
575 10 73
750 4 73
770 10 98
880 10 112
1150 10 146
1500 4 146
Minimum counter-pressure at the discharge valve of the
pump
Pump type
DMH 251
DMH 252
DMH 253
DMH 254
DMH 255
DMH 257
[bar]
Note
8
8
5
5
0.8
0.8
60 Hz
Max.
Q* p max. stroke Q*
rate
[l/h] [bar] [n/min] [l/h]
60 10 31 101
122 10 65 203
172 10 90 286
210 10 110
255 10 134
- - -
55 16 31 92
116 16 65 193
163 16 90 271
200 16 110
242 16 134
- - -
233 10 65 387
324 10 90 540
398 10 110
484 10 134
- - -
264 10 34 440
528 10 67 880
690 10 88 1150
900 4 88 1500
924 10 118
1056 10 134
- - -
- - -
A positive pressure difference of at least 2 bar is
required between the suction valve and the
discharge valve in order for the dosing pump to
operate correctly.
If the total counter-pressure (at the dosing point) and
geodetic height difference between the suction valve
and the dosing point is less than 2 bar (20 m WC), a
pressure-loading valve must be installed immediately
before the dosing point.
100 Hz
Max.
p max. stroke
rate
[bar] [n/min]
10 52
10 108
10 150
- - -
- - -
- - -
16 52
16 108
16 150
- - -
- - -
- - -
10 108
10 150
- - -
- - -
- - -
10 56
10 112
10 146
4 146
- - -
- - -
- - -
- - -
[bar]
2
2
2
2
2
2