13
3.5 Starting
Start the electric motor and gradually open the discharge pipe until you reach the required flow. The pump
can't operate more than two or three minutes with its discharge closed. A longer period can cause serious
damage to the pump. If the pressure shown on the pressure gauge on the discharge piping does not increase,
stop the pump immediately and release the pressure carefully. Repeat the operation of installation of the
pump as in paragraph 2. If during the starting procedure there are changes of flow-rate, density, temperature
or viscosity of the liquid, stop the pump and contact AlphaDynamic Pumps SA technical service.
3.6 Optimum conditions for use
Operating continuously at the peak performance (maximum capacity/head) may cause early wear of
the pump. As a general rule, we recommend using the pump at half of its maximum capacity (see the
paragraph relative to the technical data). The flow capacity and head of the pump refer to water
pumping at room temperature. If it pumps high temperature liquids or other viscosities and densities,
the performance has to be proportionately decreased. Pumps of series ADH work well with liquids
having a viscosity up to 500 cP
3
and specific gravity up to 1.9
3
. HOWEVER BOTH VISCOSITY AND THE
SPECIFIC GRAVITY HAVE TO BE COMMUNICATED AT THE MOMENT OF QUOTATION. The electric
motor is selected for the viscosity and the specific gravity communicated. In the case of higher values,
the power of the motor could be insufficient.
3
The values indicated are merely indicative and can vary in the series of pumps mod. ADH
3.7 Shut down
Normally the pump should be shut down only after closing the discharge valve. If the suction valve is
closed before the other, cavitation of the pump can occur. If the suction is flooded, close the valve
after shutting down the pump. In some cases the pump can be used to empty tanks. In these
situations the liquid can stop flowing in the pump while the pump is still working. In these cases, a
pump operating without liquid (this means dry-running) can be dangerously damaged if it's not
stopped immediately. For such applications the use of automatic equipment or the constant
presence of personnel who can shut down the pump is recommended.
3.8 Long pump inactivity
If the pump has to remain inactive for a long period, before stopping it, it's recommended to let water
flow in the system for several minutes so that you avoid any risk of internal deposits or sediments or
settlement of solid parts. Drain the liquid in the pump. An eventual freezing of the liquid inside the
pump can cause damage. Always verify if the pumped liquid reacts with water. In this case contact
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