Place Of Installation; Installation; Pipework; Suction Pipe - Steffens WL Bedienungsanweisung

6. Fit the guard and secure by screws.
Fig. 4 Fitting of guard
7. Install the WL 4000 - 5000 belt guard in accordance with the
instructions provided.

5.2 Place of installation

The pump should be installed in a well ventilated, dry and frost-
free position. It must be easily accessible to ensure unimpeded
maintenance work.
If the pump is installed in a well, an oil pan should be provided. In
order to avoid condensation, the well should be well ventilated.

5.3 Installation

Pump system with vertical pressure tank
3
2
1
8
Fig. 5 Pump system with vertical pressure tank
Pos. Description
1 Safety switch
2 Fuses
3 Pressure switch
4 Pressure gauge
5 Water level
6 Gate valve
7 Air controller
8 Automatic relief pressure
9 Isolation
An air controller must be installed to ensure
automatic adjustment of the air cushion in the
pump and pressure tank. All pressure tanks, with
the exception of the FILIA, FILIUS units, should
be equipped with a water level indicator.
Caution
Furthermore, a pressure gauge with marking line
to indicate the maximum permissible operating
pressure in the tank should be fitted. The
required safety valve is built into the pump air
chamber (automatic pressure relief unit K).
This or a similar plant is subject to the pressure tool regulations
RL 97/23/EG. It may only be assembled and put into operation by
authorised personnel. Before starting up the plant, local safety
regulations must be observed.
4
5
7
6
9
FILIA, FILIUS units
38,6 75
71
72
82
73
74
Fig. 6 FILIA, FILIUS unit
The aggregates are in accordance with the pressure tool
regulations RL 97/23/EG. This is documented by the named
authority of the German TÜV-Nord under the examination No.
CE0045.
Parts under pressure that do not have the CE sign are in
accordance with article 3, paragraph (3) of the DGRL (pressure
tool regulations) and have been planned and constructed in
accordance with good engineering practice. The respective
declaration of conformity is included in each unit.
The air controller may replace a water level indicator.
To avoid corrosion damages on galvanized pressure tanks, it is
necessary to follow DIN 1988, part 7, point 3, concerning the
installation.

5.4 Pipework

5.4.1 Suction pipe

Reliable pump operation mainly depends on the correct and
careful installation of the suction pipe.
In order to avoid air locks, the suction pipe should rise towards
the pump. No elbows should be used, only pipe bends, if
required. Fit a foot valve or non-return valve at the end of the
non-leaking suction pipe.
The pipe diameter should be at least the same as the pump
suction port. For suction pipes over 20 m long, an additional air
chamber (10 l capacity for flow rates up to 3.000 l/h) should be
fitted and the suction pipe should be the next bigger pipe
dimension.
Suction lift and inlet pressure
Measured by means of a vacuum-meter, the
suction lift at the pump air chamber should be
Note
between 2 and 7.5 m.
If the vacuometric suction lift is lower than 2 m, the snifter valve
no longer functions correctly and pump operation is no longer
smooth.
If the suction lift exceeds 7.5 m, the head in the suction pipe may
cause cavitation or drastically reduce the flow.
If there is an inlet pressure or an insufficient vacuum, a throttling
disc should be fitted as described in the drawing below.
49,50
4
81
79
80
79
76
78
77
7