46
EB 8048-2/-3 EN
Decommissioning and disassembly
9 Decommissioning and disas
-
sembly
Risk of bursting in pressure equipment.
Control valves and pipelines are pressure
equipment. Improper opening can lead to
valve components bursting.
−
Before starting any work on the control
valve, depressurize all plant sections con
-
cerned as well as the valve.
−
Drain the process medium from all the
plant sections concerned as well as the
valve.
−
Wear personal protective equipment.
Risk of personal injury due to residual pro
-
cess medium in the valve.
While working on the valve, residual process
medium can escape and, depending on its
properties, may lead to personal injury, e.g.
(chemical) burns.
Wear protective clothing, safety gloves, and
eyewear.
Risk of burn injuries due to hot or cold com
-
ponents and pipeline.
Valve components and the pipeline may be
-
come very hot or cold. Risk of burn injuries.
−
Allow components and pipelines to cool
down or heat up.
−
Wear protective clothing and safety gloves.
Diaphragm damage through the use of an
incompressible medium.
Closing the valve when the shut‑off valves
upstream and downstream of the valve are
closed may lead to the diaphragm rupturing
in plants with liquid media flowing through
them.
Only close the valve after opening the shut‑
off valves upstream and downstream of the
control valve.
9.1 Decommissioning
To decommission the control valve for service
and repair work or disassembly, proceed as
follows:
1. Close the shut-off valves upstream and
downstream of the control valve to stop
the process medium from flowing
through the valve.
2. Completely drain the pipelines and
valve.
3. Disconnect and lock the pneumatic air
supply to depressurize the actuator.
4. If necessary, allow the pipeline and valve
components to cool down or heat up.
9.2 Removing the valve from
the pipeline
1. Put the control valve out of operation (see
section 9.1).
2. Cut the pipeline in front of the weld
seam.
DANGER
!
WARNING
!
WARNING
!
NOTICE
!
