ABB SCK, System Manual

Page: 58 / 244

58 System Manual SCK Gas Sampling System 42/23-81 EN Rev. 4
Overview of dangers
The gas sampling system is designed such that the operator is protected against
all dangers that can be reasonably avoided by means of design.
Due to the purpose of the gas sampling system, however, there are nevertheless
residual risks that require precautions to be avoided.
The following section gives information about the nature of these residual risks and
their effect.
The gas sampling probe moves in and out automatically. Expect a system-actuated
movement of the gas sampling probe at any time. The gas sampling probe not only
performs individual extension and retraction movements but also performs com-
bined processes involving successive extension and retraction movements. This
means:
 risk of injury due to automatic extension and retraction movements of the gas
sampling probe if anyone is standing in the retractor's area of travel.
 danger of toxic, harmful gases when the shutter is open.
The gas sampling system contains current-carrying components. This means:
 danger of electrocution,
 If covers on control cabinet, terminal box or power connection are open.
Connectors in the control cabinet or terminal box may also carry current.
 If the connection between the protective earth connector and a protective
earth conductor is not made before all other connections.
 If the protective earth conductor is interrupted inside or outside the gas sam-
pling system or the protective earth connector is disconnected.
 If the set operating voltage and mains voltage do not match before switching
on.
 If work is performed on the open gas sampling system without disconnecting
the gas sampling system from the power supply.
 Due to charged capacitors in the gas sampling system even if the gas sam-
pling system has been disconnected from all sources of power.
 Due to fuses that do not match the specified type and nominal current and
repaired fuses.
During operation of the gas sampling system surfaces and parts get hot. This
means:

Danger of burning due to hot surfaces during and after operation of the system.
When the shutter is open, gases flow out of the rotary kiln duct opening that may
be harmful to health. This means:
 Danger of poisoning due to harmful gases.
 Danger of burning due to jets of flame at the duct opening.
During operation of the gas sampling system, the cooling water in the cooling
system gets very hot. This means:

Danger of scalding in the event of contact with the hot cooling water.
 Danger of burning in the event of contact with the cooling water pipes.
The cooling system contains cooling water with anti-freeze. This means:
 Danger of injury to skin and eyes in the event of contact with anti-freeze.
Meaning
Moving gas sampling
probe
Current-carrying
components
Hot surfaces
Harmful gases at the
duct opening
Hot cooling water
Anti-freeze in the
cooling water