Periodic Testing - Samson 3351 Mounting And Operating Instructions

9.1 Periodic testing

Depending on the operating conditions,
check the valve at certain intervals to prevent
possible failure before it can occur. Plant op-
erators are responsible for drawing up an
inspection and test plan.
We recommend the following inspection and testing which can be performed while the pro-
cess is running:
Inspection and testing
Check the markings, labels and
nameplates on the valve for their
readability and completeness.
Check the pipe connections and gaskets
on the valve and actuator for leakage.
Check the test connection for external
leakage.
WARNING! Risk of personal injury due
to pressurized components and process
medium being discharged. Do not
loosen the screw of the test connection
while the valve is pressurized.
Check the valve's seat leakage.
Check the valve for external damage
(e.g. corrosion).
Check the valve accessories to ensure
they are mounted properly.
If possible, check the valve's fail-safe
position by briefly interrupting the air
supply.
EB 8039 EN
Tip
Our after-sales service can support you in
drawing up an inspection and test plan for
your plant.
Action to be taken in the event of a negative result:
Immediately renew damaged, missing or incorrect
nameplates or labels.
Clean any inscriptions that are covered with dirt and are
illegible.
Check the bolted joint (tightening torque).
Replace the gasket on the flanged joint.
Replace the diaphragm (see section 9.4).
Replace the packing (see section 9.4)
Put the control valve out of operation (see the
'Decommissioning' section).
Shut off the section of the pipeline and flush the valve to
remove any dirt and/or deposited foreign particles between
the seat and plug.
Repair any damage immediately. If necessary, put the
control valve out of operation (see the 'Decommissioning'
section).
Tighten the connections of the valve accessories.
Put the control valve out of operation (see the
'Decommissioning' section). Identify the cause for the
malfunction and rectify it (see the 'Troubleshooting' section).
Servicing
9-3