supporting ring and the cover has to be laid on the bracing (see annex 1). Brace the
cover with the cords at the supports of the supporting ring.
Pay attention to utmost cleanliness at the pure water tank.
Then on suction side the pure water pump is coupled with a pure water suction hose
and a gate valve to the pure water tank (Storz C). On delivery side of the pure water
pump, a corresponding pure water pressure hose is connected to which either a
pure water distributor, a tapping pistol or the socket for the tank filling (truck) can be
connected.
IV 1.3.2 Operation of the precoat filter
The raw water pretreated in the raw water tank can now be supplied to the precoat
pump by opening the first ball valve at the raw water collector. Open main ball valve
and precoat ball valve of the four-way valve, deaerate the precoat hose and fill both
precoat buckets with approx. 10 l of water. This is also the easiest way to deaerate
the pump. Then close both ball valves.
Then add the precoat material to both buckets (2 kg Berkesil KE, 1 kg per bucket).
Another bucket with pretreated water is required for washing down the mixed precoat
material. The precoat material has to be well stirred and wetted with a wooden stirrer.
At the beginning of the precoat process the slide valve being placed before the flow
rate meter of the precoat filter has to be opened a little (2 - 2 ½ rotations) so that the
precoat process can be carried out with a capacity of approx. 4 - 5 m³/h.
The deaerators of the precoat filter are opened, the sludge discharge ball tap is closed
and the 3-way-tap is in position „filtration“. The precoat pump is started, the ball tap of
the 4-way device at the precoat hose is opened and the precoating mass is sucked. If
this process is finished, the ball tap of the 4-way suction device at the precoat hose is
closed and the main ball tap of the 4-way device is opened for raw water feed.
The circuit ball tap of the 4-way device is always open. The pump construction allows
that the precoating process can be carried out with low motor speed (fuel saving). As
soon as water flows out through the deaerators of the precoat filter, they have to be
closed. If the water flows through the pure water pipe at the precoat filter after a short
time, the 3-way tap has to be turned to position „circuit“.
Attention
!
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