Samson 3351 - Leakage; Fail-Safe Action; Pressure Test

5-6 EB 8039 EN
Installation
To test the valve functioning before start-up
or putting back the valve into operation, per-
form the following tests:
5.4.1 Leakage
The plant operator is responsible for per-
forming the leak test and selecting the test
method. The leak test must comply with the
requirements of the national and internation-
al standards that apply at the site of installa-
tion.
Our after-sales service can support you to
plan and perform a leak test for your plant.
1. Closethevalve.
2. Slowly apply the test medium to the inlet
space upstream of the valve. A sudden
surgeinpressureandresultinghighow
velocities can damage the valve.
3. Open the valve.
4. Apply the required test pressure.
5. Checkthevalveforleakagetotheatmo-
sphere.
6. Depressurizethepipelinesectionand
valve.
7. Rework any parts that leak and repeat
the leak test.
5.4.2 Fail-safe action
Î Shut off the signal pressure line.
Î Checkwhetherthevalvemovestothe
fail-safe position (see the 'Design and
principle of operation' section).
5.4.3 Pressure test
The plant operator is responsible for per-
forming the pressure test.
Our after-sales service can support you to
plan and perform a pressure test for your
plant.
During the pressure test, make sure the fol-
lowing conditions are met:
− Retract the plug stem to open the valve.
− Observe the maximum permissible pres-
sure for both the valve and plant.
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