Samson 3351 - Periodic Testing

EB 8039 EN 9-3
Servicing
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.
Our after-sales service can support you in
drawing up an inspection and test plan for
your plant.
Tip
We recommend the following inspection and testing which can be performed while the pro-
cess is running:
Inspection and testing Actiontobetakenintheeventofanegativeresult:
Checkthemarkings,labelsand
nameplates on the valve for their
readability and completeness.
Immediately renew damaged, missing or incorrect
nameplates or labels.
Cleananyinscriptionsthatarecoveredwithdirtandare
illegible.
Checkthepipeconnectionsandgaskets
on the valve and actuator for leakage.
Checktheboltedjoint(tighteningtorque).
Replacethegasketontheangedjoint.
Replacethediaphragm(seesection9.4).
Replacethepacking(seesection9.4)
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.
Put the control valve out of operation (see the
'Decommissioning' section).
Checkthevalve'sseatleakage. Shutoffthesectionofthepipelineandushthevalveto
remove any dirt and/or deposited foreign particles between
the seat and plug.
Checkthevalveforexternaldamage
(e.g. corrosion).
Repair any damage immediately. If necessary, put the
control valve out of operation (see the 'Decommissioning'
section).
Checkthevalveaccessoriestoensure
they are mounted properly.
Tighten the connections of the valve accessories.
If possible, check the valve's fail-safe
positionbybrieyinterruptingtheair
supply.
Put the control valve out of operation (see the
'Decommissioning' section). Identify the cause for the
malfunction and rectify it (see the 'Troubleshooting' section).