Pellet store
Ventilation
45
6.9
Ventilation
Requirements for ventilating the pellet store
Pellet stores must have ventilation to prevent
dangerous CO concentrations. In Austria ÖNORM
M 7137 applies, and in Germany VDI 3464.
Requirements of ÖNORM M 7137 for storage of up to
30 tonnes of pellets:
•
If the filling nozzles flow into the open and "ventilat-
ed" sealing covers are used (see
•
If the minimum diameter of the filling lines is
90 mm.
•
If the filling lines or ventilation lines up to a length
of 2 m the free ventilation cross-section is at least
40 cm². Over 2 m length the free ventilation cross-
section must be at least 60 cm².
Refer to the standards for details for larger store
rooms. For questions about details, consult an
expert or the building inspectorate or the regional fire
prevention agency.
Requirements of VDI 3464 for ventilating the
pellet store can be taken from the table (
).
Tab. 6-2: Requirements of VDI 3464
Length of
the venti-
lation line
Store size ≤ 10 tonnes
Store size > 10 tonnes
≤ 2 m
Ventilation via sealing cover with the follow-
ing requirements:
•
Two ventilated sealing caps on two Storz
A couplings
•
Ventilation to the outside or in ventilated
installation room of the heating system
Ventilation via sealing cap only in stores up uo 40 t with
the following requirements:
•
minimum 2 ventilated sealing caps on two Storz A
couplings
•
Cross-section minimum 4 cm²/t capacity
•
Ventilation to the outside or in ventilated installation
room of the heating system
2 - 5 m
a ventilation opening with the following re-
quirements:
•
Ventilation into open air
•
Air line opening minimum 100 cm²
•
clear opening minimum 80 cm²
separate ventilation opening(s) with the following re-
quirements:
•
Ventilation into open air
•
Opening per air line minimum 100 cm²
•
Total ventilation cross-section minimum 10 cm²/t ca-
pacity
•
clear opening minimum 8 cm²/t capacity
5 - 20 m
mechanical ventilation with the following requirements:
•
Ventilation of the store via an air line with a fan
•
Fan with three-times air exchange rate per hour related to the gross volume of the store
•
The function of the fan is to be coupled with the opening of the store room door
