Safety Valve (Accessory); Non-Pressurised Break Tank (Accessory); Compensators (Accessories); Flexible Connection Pipes (Accessory) - Wilo SiBoost Smart Série Notice De Montage Et De Mise En Service

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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 maxi-
mum delivery pressure of the pressure-boosting
system may exceed the permissible operating
pressure of an installed system component. The
safety valve must be designed so that it will drain
off the volume flow occurring in the pressure-
boosting system when the positive operating
pressure is 1.1-times the admissible level (dimen-
sioning data are given in the data sheets/pump
characteristic curves of the pressure-boosting
system). The outflowing water current must be
safely drained off. The corresponding installation
and operating instructions and the relevant provi-
sions must be observed for the installation of the
safety valve.

7.2.7 Non-pressurised break tank (accessory)

To connect the pressure-boosting system indi-
rectly to the public drinking water mains, it must
be installed together with a non-pressurised
break tank according to DIN 1988. The same rules
apply to the installation of the break tank as to the
pressure-boosting system (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 dimensioning the bearing
capacity of the bearing surface. When installing,
make sure there is sufficient space for inspection
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 non-pressurised (i.e. under atmospheric pres-
sure) closed PE tank which we supply as an acces-
sory must be installed according to the transport
and installation instructions supplied with the
tank.
In general, the following procedure applies:
Connect the tank without mechanical tension
before commissioning. This means that the con-
nection must be made using flexible components,
like expansion joints or hoses.
The tank overflow must be connected according
to the applicable regulations (DIN 1988/T3 or
1988-300 in Germany).
Take suitable measures to prevent heat transmis-
sion through the connection lines. PE tanks of the
Wilo range are only designed to accommodate
clean water. The maximum temperature of the
water must not exceed 50 °C (see also the tank
documentation).
CAUTION! Risk of property damage!
The tanks are statically designed for their nom-
inal capacity. Subsequent changes can affect
the static forces and cause impermissible defor-
mations or even destruction of the tank.
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The electrical wiring (protection against low water
level) to the system's control device must also be
connected before the pressure-boosting system
is commissioned (see the details in the installation
and operating instructions for the control device).
NOTICE!
Before filling the tank, clean it and flush it!
CAUTION! Health hazard and risk of damage!
You must not walk on plastic tanks. Walking on
the cover or subjecting it to loads can cause
accidents resulting in damage.

7.2.8 Compensators (accessories)

For stress-free installation of the pressure-
boosting system, connect the pipes using expan-
sion joints (Fig. 9 - B). The compensators must be
equipped with a structure-borne noise-insulating
extension limiter to absorb the reaction forces
that occur. The expansion joints must be installed
stress-free in the pipes. No alignment errors or
pipe displacement must be compensated for with
expansion joints. When installing, the screws must
be tightened uniformly, working across diagonals.
The ends of the screws must not project beyond
the flange. If welding work is done nearby, the
expansion joints must be covered for protection
(sparks, radiated heat). The rubber parts of expan-
sion joints must not be painted and must be pro-
tected from oil. The expansion joints must be
accessible for inspection within the system at any
time and must therefore not be covered by the
pipe insulation.
NOTICE!
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 in DIN 1988).

7.2.9 Flexible connection pipes (accessory)

In the case of pipes with threaded connections,
flexible connection pipes can be used for stress-
free installation of the pressure-boosting system
and in the event of slight pipe displacement
(Fig. 10 - B). The flexible connection pipes from
the Wilo range consist of a high quality stainless
steel corrugated hose, sheathed with stainless
steel braiding. A flat-sealing stainless steel
screwed connection with a female thread is pro-
vided at one end for installation on the pressure-
boosting system. A male pipe thread is provided at
the other end to connect to further pipework.
Depending on the size, certain maximum permis-
sible deformation limits are to be met (see table 2
and Fig. 10). Flexible connection pipes are not
suitable for absorbing axial vibrations and com-
pensating the corresponding movements. A suit-
able tool must be used to prevent kinking or
twisting during the installation. In the event of
angular displacement of the pipes, it is necessary
to fixate the system to the floor, taking into
account suitable measures to reduce the struc-
ture-borne noise.
WILO SE 08/2018