Biogas Safety first!

Specific requirements
Technical protective measures
To be able to assess the functional capability of the
activated carbon or other materials at all times, including
in ongoing operation, it is strongly recommended
that suitable monitoring systems (e.g. a gas
analyser) should be installed.
Organisational protective measures
If the use of ferrous materials or activated carbon
is unavoidable, zero-emission or low-emission types
must be chosen (e.g. pelleted or coated products
rather than powdered products).
Classification of Ex zones
Surroundings of external desulphurisation units
(outside digesters)
Outdoors
Desulphurisation system technically leak-tight.
No zoning necessary, unless the manufacturer’s
instructions specify different classification of
zones.
In inside spaces
Desulphurisation system technically leak-tight.
Zone 2: entire space
13. Requirements for gas analysis
A variety of gas analysis systems are used in practice,
with a distinction being drawn between mobile
and fixed systems and between manual and automated
systems. The following gas constituents are
regularly detected: CH 4
, CO 2
, H 2
S and O 2
.
Organisational protective measures
Regular maintenance and calibration of the gas
analysis systems is recommended in accordance
with manufacturer’s instructions.
Technical protective measures
The gas being measured must be discharged to the
open air or returned to the gas stream. Alternatively,
a forced ventilation system must be installed with a
minimum air exchange rate that ensures adequate
dilution of the maximum possible gas volumes or
the gas facility must be relocated to the CHP unit
installation room.
Classification of Ex zones
After gas analysis, the gas is discharged from the
analyser to the open air.
Zone 2: in the vicinity of the discharge opening.
Technically leak-tight gas analyser in combination
with adequate organisational measures
in combination with regular leak checks and
adequate ventilation in the room.
No zoning necessary, unless the manufacturer’s
instructions specify different classification of
zones.
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