28
EB 2043 EN
Decommissioning and disassembly
Risk of personal injury due to residual pro-
cess medium in the valve and safety tem-
perature monitor.
While working on the valve or safety tem
-
perature monitor, residual process medium
can escape and, depending on its proper-
ties, may lead to personal injury, e.g. (chem
-
ical) 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.
9.1 Decommissioning
To decommission the safety temperature
monitor before removing it, proceed as fol-
lows:
1. Close the shut-off valve on the upstream
side of the valve.
2. Close the shut-off valve on the down-
stream side of the valve.
3. Completely drain the pipelines and
valve.
4.
Depressurize the plant. Shut off or dis
-
connect the control line, if installed.
WARNING
!
WARNING
!
9 Decommissioning and disas-
sembly
Risk of bursting in pressure equipment.
Valves and pipelines are pressure equip
-
ment. Improper opening can lead to bursting
of the valve.
−
Before starting any work on the valve, de
-
pressurize all plant sections concerned 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 process me-
dium escaping under pressure.
While removing the control thermostat/
safety temperature monitor (STM)/safety
temperature limiter (STL) from the valve, the
sealed-off valve is opened. Residual process
medium will escape and, depending on its
properties, may lead to personal injury, e.g.
(chemical) burns.
−
Depressurize the plant.
−
Wear protective clothing, safety gloves,
and eyewear.
DANGER
!
DANGER
!
