Samson 3374 - Page 74

10-2 EB 3018 EN
Decommissioning
Risk of hearing loss or deafness due to loud
noise.
Noise emission (e.g. cavitation or ashing)
may occur during operation caused by the
process medium and the operating condi-
tions.
Î Wear hearing protection when working
near the regulator.
Crush hazard arising from moving parts.
The electric actuator contains moving parts
(actuator and plug stems), which can injure
hands or ngers if inserted into the actuator.
Î Do not insert hands or nger into the
yoke while the valve is in operation.
Î Disconnect the supply voltage and pro-
tect it against unintentional reconnection
before performing any work on the con-
trol valve.
Î Do not impede the movement of the actu-
ator or plug stem by inserting objects in-
to their path.
Î Before unblocking the actuator and plug
stem after they have become blocked
(e.g. due to seizing up after remaining in
the same position for a long time), re-
lease any stored energy in the actuator
(e.g. spring compression). See associat-
ed actuator documentation.
Î Before starting any work on the regula-
tor, depressurize plant sections as well as
the regulator.
WARNING
!
WARNING
!
WARNING
!
Risk of personal injury due to residual
process medium in the regulator.
While working on the regulator, residual
process medium can escape and, depending
on its properties, may lead to personal in-
jury, e.g. (chemical) burns.
Î Wear protective clothing, safety gloves
and eye protection.
Refer to the mounting and operating
instructions of the electric actuator for more
details (see documents listed under
'Referenced documentation' in the 'Safety
instructions and measures' section).
To decommission the regulator for service
work or disassembly, proceed as follows:
1. Disconnect the supply voltage from the
electric actuator (see documents listed
under 'Referenced documentation' in the
'Safety instructions and measures' sec-
tion).
2. Close the shut-off valve (1) on the up-
stream side of the regulator.
3. Close the shut-off valve (6) on the down-
stream side of the regulator.
4. Completely drain the pipelines and
valve.
5. Depressurize the plant.
6. If necessary, allow the pipeline and reg-
ulator components to cool down or warm
up to the ambient temperature.
WARNING
!
WARNING
!
Note