MHI Series Horizontal Booster Pumps

Non-self-priming multistage pump
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Application |
WILO MHI series is applied to pumping potable water, cold and hot water in heating and water supply systems, condensate, water glycolic mixtures (up to 40% of glycol in the content), as well as other media containing neither mineral fat, nor abrasive or long fibrous impurities.
MHI booster pumps application: water supply and pressure boosting units, boiler feeding, industrial circulating systems, water cooling circuits, fire distinguishing systems, as well as washing and irrigation systems.
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Performance Diagram |

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Marking |
Example: MHI 205N-1/E/3-400-50-2 |
MHI -
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Multistage horizontal high-pressure centrifugal pump |
2 - |
Volume flow in m³/h |
05 - |
Number of impellers |
N - |
IE2 motor |
1 - |
Material 1 = 1.4301 (AISI 304) 2 = 1.4404 (AISI 316L) |
E - |
Type of seal E = EPDM V = FKM (Viton) |
3 - |
1 = 1~ (single-phase AC) 3 = 3~ (three-phase AC) |
400 - |
Connection voltage in V |
50 - |
Frequency in Hz |
2 - |
Number of poles |
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MHI Booster Pumps
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Technical Data |
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WILO MHI |
2... |
4... |
8... |
16... |
Media allowed to be pumped |
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Potable water and process water, water for heating system |
yes |
Condensate |
yes |
Water glycolic mixture (up to 40% of glycol, starting from 10% - motor capacity adjustment neededis required) |
yes |
Other low viscous liquids (containing neither abrasive, nor long fibrous impurities that damage the pump) |
yes |
Operational characteristics (at frequency 50 Hz) |
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Max. flow rate [m3/h] |
5 |
8 |
12 |
25 |
Max. head [m] |
70 |
70 |
60 |
47 |
Temperature of pumped medium [оС] |
from -15 to +110 |
Ambient temperature [оС] |
40 |
Process pressure [bar] |
10 |
Inlet pressure [bar] |
6 |
Max. frequency [r/min] |
2950 |
Motor |
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Electric connections 1~[V/Hz] (allowable voltage deviation ±10%) |
230/50 or 220/60 |
Electric connections 3~[V/Hz] (allowable voltage deviation ±10%) |
230/50 ∆ or 220/60 ∆ 400/50 Y or 380/60 Y |
Insulation class |
F |
Jamming |
EN 61800-3 |
IP rating |
IP 54 |
Connections |
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Diameter of connections at discharge side [Rp] |
1 |
1 |
1¼ |
1½ |
Constructing materials |
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Impeller |
1.4301/1.4404 |
Stage chamber |
1.4301/1.4404 |
Pump housing |
1.4301/1.4404 |
Shaft |
1.4404 |
Mechanical seal |
EPDM (EP 851)/Viton |
Housing cover |
1.4301/1.4404 |
Sliding mechanical seal |
Graphite (Carbon)/Tungsten catch (SIC) |
Forcing valve |
1.4301/1.4404 |
Bearing |
Tungsten catch |
Pump foot |
Aluminum |
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Explanatory note to inlet pressure:
Maximum inlet pressure is calculated in the following way: the maximum working pressure of the system minus the maximum pressure generated by the pump at Q = 0
Explanatory note to the materials used:
1.4301 steel corresponds to AISI 304, 1.4404 steel corresponds to AISI 316L.
