Alarko ALD 400 Series, Руководство по эксплуатации

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12
MEMBRANE TANK (Pressure Compensating Tank)
There are different applications for membrane tanks in water boosters;
ALD and ALDF Water Booster:
The user must use a membrane tank with the motopump assembly. The
selection, installation and pressurization of this tank are described below.
Note: These calculations are for finding the minimum value of the tank volume. There
is no inconvenience in using tanks larger than the value obtained from the
calculation. As the tank volume increases;
- Pressure fluctuations in water reduce.
- The commissioning and decommissioning sounds of the motopump reduce.
- The service life of the motor extends.
- Energy expenditure reduces.
In industrial applications where the water consumption rate is more standard
than for social use, a smaller tank can be selected.
0,33*Q
max
*(P
max
+10)
V
tank = --------------------------------------------------
△
P*a
V
tank
: Volume of tank to be used (liters)
Q
max
: Total flow rate of the pumps at operating pressure (liters/hour)
P
min
: Starting pressure of pumps (mSS)
P
max
: Stop pressure of pumps (mSS)
△ P : Pmax-Pmin
a : Number of switches to be considered for motor (number/hour)
Note: In the “1999 Unit Price and Tariff Book”, the Ministry of Public Works indicated that
the number of switches should be maximum 180 times/hour for engines up
to 1.1 kW
and maximum 40 times/hour for engines above 1.1 kW.
The volume of the membrane tank to be selected for ALDF must be at
least 10% of the membrane tank volume calculated for ALD.
Caution: The maximum operating pressure of the membrane tank must be
higher than the maximum operating pressure of the pump.