Alarko ALD 400 Series, Руководство по эксплуатации

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13
CONNECTION OF MEMBRANE TANK
The duty of the membrane tank is to reduce the number of switches (the number of starts
and stops of the motor within 1 hour). Thus, the motopump does not need to be
commissioned for small-scale uses. Therefore, the larger the tank, the lesser the number of
switches.
Membrane tanks can be connected to the motopump assembly in two ways.
1- Connection to Collector:
There is a membrane tank connection outlet on the water booster pressure collector. The
tank can be connected with a flexible steel braided hose, galvanized pipe or plastic pipe. In
this connection, a piping at least at the membrane tank outlet diameter in the water booster
pressure collector should be used. If the installation has a small diameter, the water transfer
rate between the tank and the installation decreases. The required efficiency cannot be
obtained from the tank. There may be disruptions in the operation of the water booster.
2- Connection to Installation:
It is possible to connect the tank directly to the installation. In this case, the membrane tank
connection end in the collector should be closed and the total distance of the tank to the
motopump assembly should not exceed 5 meters. Otherwise, the pressure switch will be
delayed to detect pressure changes and irregular operation may occur.
PRE-GAS PRESSURE SETTING OF MEMBRANE TANK
Motopump assembly can not be used without tank. An active tank must be used. Konforal
membrane tanks can be used for this purpose provided that the operating pressure values
are appropriate. When the membrane tanks are shipped, very little amount of gas is
pumped into them. The air pressure of the membrane tank should be adjusted according to
the conditions of use.
Tank Pressure = Water Booster Operating Pressure - 0.5 (bar)
Tank pressure for ALDF = Water booster set pressure x 0,7
Example 1:
If the booster is operated between 5-7 bar, the air pressure of the tank should be 4.5 bar.
Example 2:
The pressure of the tank of a water booster with triple pump with pressure switch
adjustments of 5-7, 4.5-6.5 and 4-6 bar should be 3.5 bar.
The table below has been prepared to assist the users for operating the ALD water boosters
with the assumption that the water booster will operate at the pressure values on page 16.