Diaphragm Pressure Tank (Accessory); Safety Valve (Accessory); Non-Pressurised Break Tank (Accessory); Expansion Joints (Accessories) - Wilo FLA Série Notice De Montage Et De Mise En Service

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7.2.3 Diaphragm pressure tank (accessory)

For transport reasons, the diaphragm pressure
vessel (8 litre) that is part of the scope of delivery
of the system may be delivered unmounted (i.e.
packed separately). It must be mounted before
commissioning (see Fig. 4).
NOTE
For systems of type FLA-1, ensure that the
throughflow fitting is not twisted. The fitting is
correctly mounted when the drain valve (see also
B, Fig. 4) or rather the flow direction arrows
stamped on it are parallel to the collecting pipe.
If an additional larger diaphragm pressure vessel
has to be installed, observe the corresponding
installation and operating instructions. When
installing a diaphragm pressure vessel, also make
sure there is enough room for maintenance or
replacement work.
NOTE!
Diaphragm pressure vessels require regular test-
ing according to the directive 97/23/EC (in Ger-
many, also take into account the Operating Safety
Ordinance §§ 15(5) and 17 as well as Annex 5).
Check valves must be provided upstream and
downstream of the vessel for tests and inspection
and maintenance work on the piping. To prevent
system downtimes, connections for a bypass can
be provided upstream and downstream of the dia-
phragm pressure vessel. Special maintenance and
test instructions can be taken from the installa-
tion and operating instructions for the diaphragm
pressure vessel concerned.

7.2.4 Safety valve (accessory)

Ensure that, in the event of a fire, no impermissible
pressures will arise as a result of high tempera-
tures. If necessary, provide safety valves to dis-
charge the expansion water (see DIN 4753 and
DIN EN1509).

7.2.5 Non-pressurised break tank (accessory)

To connect the system indirectly to the public
potable water mains, it must be installed together
with a non-pressurised break tank according to
DIN 1988-600. The rules for the pressure boost-
ing system apply to the installation of the break
tank as well (see 7.1). The entire base 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
cause destruction. The enclosed, non-pressurised
PE tank (i.e. under atmospheric pressure), which
we supply as an accessory, must be installed
according to the installation and operating
instructions included with the tank. In general, the
following procedure applies: the tank must be
connected free from mechanical stresses before
commissioning. This means that the connection
34
must be made using flexible components, like
expansion joints or hoses. The tank overflow must
be connected according to the regulations in
force. Take suitable measures to prevent heat
transmission through the connection lines. PE
tanks of the WILO range are only designed to
accommodate clean water. The maximum tem-
perature of the water must not exceed 50°C.
CAUTION! Risk of damage!
The tanks are designed statically for their nominal
capacity. Subsequent changes can affect the
static forces and cause impermissible deforma-
tions or even destruction of the tank.
The electrical wiring (for low-water protection
device) to the system's control device must also
be connected before the system is commissioned
(see the details in the installation and operating
instructions for the control device).
NOTE!
The tank must be cleaned and flushed before it is
filled.
WARNING! Risk of injury or damage!
You must not walk on plastic tanks. Walking on
the cover or subjecting it to loads can result in
personal injury or damage to the tank.

7.2.6 Expansion joints (accessories)

For the stress-free installation of the system, the
pipes must be connected with expansion joints
(see example in Fig. 8a). The expansion joints
must be equipped with a structure-borne noise-
insulating extension limitation to absorb the reac-
tion forces that occur. The expansion joints must
be installed without tension in the pipes. No align-
ment errors or pipe displacement must be com-
pensated for with expansion joints. The screws
should be tightened evenly crosswise during the
installation. The ends of the screws must not pro-
ject beyond the flange. If welding work is done
nearby, the expansion joints must be covered for
protection (sparks, radiated heat). The rubber
parts of expansion joints must not be painted and
must be protected from oil. The expansion joints
must be accessible for inspection within the sys-
tem at any time and must therefore not be cov-
ered by the pipe insulation.
NOTE!
Expansion joints are subject to wear. It is neces-
sary to regularly check for cracks or blisters,
exposed fabric or other defects (see recommen-
dations of DIN 1988).
WILO SE 08/2019