EN 12845:2004+A2:2009
Each pump shall have automatic priming arrangements in accordance with
10.6.2.4 Pump priming
Each pump shall be fitted with a separate automatic priming arrangement.
The arrangement shall consist of a tank situated at a higher level than the pump and with a pipe connection sloping from the tank to the delivery side of the pump. A non-return valve shall be fitted to this connection.
Figure 6 shows two examples.
The tank, the pump and the suction pipework shall be kept constantly full of water even where there is leakage from the foot valve referred to in 10.6.2.3. Should the water level in the tank fall to 2/3 of the normal level, the pump shall start.
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