Sprinklers: connected to the outfeed unit there must be a sprinkler device
set to trip at 55°C. When the sprinkler is triggered, the outfeed auger
enclosure is completely flooded. The quantity of water required to do so is
at least 20 litres.
Note
Fuel storeroom The same minimum fire safety requirements apply as for the boiler room.
Storeroom doors/hatches: storeroom doors/hatches must be fire safe to
Class T30, self-closing and lockable. There must be a warning sign
carrying the message "Do not enter when feeder system is running"
attached to the storeroom door/hatch.
Inspection covers: there must be a lockable F90-class inspection hatch
above the fuel outfeed channel.
Filler pipes: filler pipes through rooms where there is a fire risk must be
provided with Class F90 cladding.
Safety systems In Austria various safety systems are required according to prTRVB
H118
(Technical Directive on Preventative Fire Safety)
depending on the system
design, heat output, fuel type and fuel store size.
Woodchip Burn-back prevention device
(fire safety flap)
Back-ignition prevention device
(fire safety flap)
Automatic fire extinguishing facility
sprinkler
Burn-back inhibiting facility
(sloping fuel auger)
Flame monitor in boiler room
(photo sensor)
Temperature monitor in the fuel storeroom/bunker
A temperature monitor connected to a visual and audible warning device must be
installed at the point where the fuel auger exits the fuel store and enters the boiler
room. The warning device must be triggered when the temperature exceeds 70°C.
Safety equipment to be provided on site:
Manually operated fire extinguishing facility
If 50 m³ of fuel or more can be stored, a manually operated fire extinguishing
facility must be installed. It must be protected against freezing and connected to a
pressurised water pipe (DN20 conduit). The discharge point must be located
directly above where the fuel outfeed auger exits the storeroom. The fire
extinguishing facility must be identified by a sign carrying the inscription "Fuel
storeroom fire extinguisher".
Pellets Burn-back prevention device
(fire safety flap)
Burn-back inhibiting facility
(sloping fuel auger)
For heating systems with a heat output > 150kW or fuel storerooms > 50m³,
differences from this directive in the form of special designs are permissible if
they provide at least the same degree of fire safety as required by this
directive
(prTRVB h118)
.
The sprinkler system must be connected on all systems regardless
of local regulations.
Any differences are to be examined by a testing agency
and documented in an inspection report.
