2 | Safety
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M0741021_en | Installation and operating instructions Spring blade agitator FBR
2.5 Safety devices
Safety equipment
Safety function
Limit switch for top of gravity
shaft:
Protection against access to the danger area of the feed/
discharge screw when the system is switched on
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If the inspection cover is opened, the system is switched off
via the limit switch
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The power supply remains switched on
Burn back flap:
The burn back protection system (BPS) is part of the boiler and
is located directly below the top part of the gravity shaft. During
the heating up phase, after loading has taken place and in the
event of a fault, it reliably disconnects the discharge and infeed
devices, preventing fire from spreading to the fuel store.
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Depending on the design of the system, a burn back flap or a
rotary valve is fitted.
Rotary valve:
Water sprinkler system:
Self-activating extinguisher system to limit burn back around the
top of the gravity shaft.
If the temperature in the top of the gravity shaft rises above
95°C, the valve of the sprinkler system opens, water flows out
and prevents the fire from spreading to the fuel store.
TMF:
Temperature monitoring device in the fuel store (as per TRVB
H118, Austria only) which activates the customer’s alarm(s)
when the temperature in the fuel store exceeds 70°C.
