Diaphragm Pressure Vessel (Accessory) - Wilo Economy Notice De Montage Et De Mise En Service

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7.2.5 Diaphragm pressure vessel (accessory)

For transport reasons, the diaphragm pressure
vessel (8 litre) that is part of the scope of delivery
of the DEA may be not be fitted upon delivery, i.e.
it was separately packed. Before commissioning,
this must be mounted on the flow valve (see
Fig. 2a and 2b).
NOTE:
Ensure that the throughflow fitting is not twisted.
The valve is fitted correctly when the drainage
valve (also see C; Fig. 2b) and the printed flow
direction arrows run parallel to the manifold pipe.
If an additional, larger diaphragm pressure ves-
sel has to be installed, observe the corresponding
installation and operating instructions. In the case
of a potable water system, use a through-flow
diaphragm vessel according to DIN 4807. When
installing diaphragm vessels, also make sure there
is enough room for maintenance work or replace-
ment.
Nominal diameter
Connection
Max. volume flow (m
Table 1
7.2.6 Safety valve (accessory)
A component-tested safety valve must be
installed on the discharge side if the sum of the
maximum possible supply pressure and the max-
imum delivery pressure of the DEA can exceed the
admissible positive pressure of an installed system
component. The safety valve must be designed so
that the DEA delivery flow that occurs at 1.1-
times the admissible positive pressure is drained
off (design data are given in the data sheets/char-
acteristic curves of the DEA). The outflow must be
drained away safely. The corresponding installa-
tion and operating instructions and the relevant
conditions must be observed during the installa-
tion of the safety valve.
7.2.7 Non-pressurised break tank (accessory)
To connect the DEA indirectly to the public pota-
ble water mains, it must be installed together with
a non-pressurised break tank according to
DIN 1988. The rules for the DEA apply to the
installation of the break tank as well (see 7.1).
The entire bottom of the tank must be in contact
with a solid bearing surface.
The maximum volume of the tank concerned must
be considered when designing the load-bearing
capacity of the bearing surface. When installing,
sufficient space must be allowed for overhaul
work (at least 600 mm above the tank and
1000 mm on the connection sides). The tank
must not slant when full, because an uneven
load can lead to its destruction.
36
DN20 DN25
(Rp3/4") (Rp1")
3
/h) 2.5 4.2
NOTE:
Diaphragm pressure vessels require regular test-
ing according to directive 97/23/EC (In Germany,
also according to the Operating Safety Ordinance
§§ 15(5) and 17 as well as appendix 5).
A check valve has to be provided upstream and
downstream of the tank for tests, overhaul and
maintenance work on the pipe. Special mainten-
ance and test notes are given in the installation
and operating instructions of the relevant dia-
phragm pressure vessel.
If the maximum volume flow of the system is
greater than the maximum recommended volume
throughput of the diaphragm pressure vessel (see
table 1 and information on the type plate and the
installation and operating instructions for the
tank), the volume flow must be divided, i.e. a by-
pass pipe must be installed. (Examples are given in
the diagram in Fig. 5 and 6). The installation con-
ditions and delivery data of the DEA must be taken
into account when dimensioning. An adequate
through-flow of the diaphragm vessel must be
ensured.
DN32 DN50 DN65
(Rp11/4") Flange Flange
7.2 15 27
The non-pressurised enclosed PE tank (i.e. under
atmospheric pressure), which we supply as an
accessory, must be installed according to the
transport and installation instructions included
with the tank.
The following procedure is generally applicable:
The tank must be connected free from mechanical
stress before commissioning. This means that the
connection must be made using flexible compon-
ents such as compensators or hoses. The tank
overflow must be connected according to the
applicable regulations (in Germany, DIN 1988/T3).
Heat transmission through the connecting pipes
must be avoided by taking suitable measures.
PE tanks in the WILO range are designed to
accommodate clean water only. The maximum
temperature of the water must not exceed 50 °C.
CAUTION!
The tanks are statically designed for the nominal
content. Subsequent changes can adversely
affect the statics and lead to the inadmissible
deformation or even destruction of the tank.
The electrical connection (protection against low
water level) to the system's control unit must also
be made before the DEA is commissioned (see the
details contained in the installation and operating
instructions for the control unit).
NOTE:
The tank must be cleaned and flushed before it is
filled.
CAUTION!
Do not walk on plastic tanks. Walking on the
cover or loading it can result in damage.
DN80 DN100
Flange Flange
36 56
WILO SE 05/2019