Section 7: Periodic Test and
Maintenance Requirements
7�1 General
Please consider that the information in this paragraph are relevant only in regards of
Reliability Tests; please refer to Doc. Installation, Operation and Maintenance manual for
detailed information about product maintenance, handling and storage.
Diagnostic tests may be made to increase the system reliability (Full-Stroke or Partial-
Stroke Test).
“On site” tests depend on Project/Plant facilities/requirements; however, a functional test
must be executed on site, prior actuator operation.
7�2 Full-Stroke Test
The “Full-Stroke Test” (“On-line”) must be performed to satisfy the PFD
AVG
(average
probability of failure on demand) value.
The full-test frequencies will be dened by the nal integrator in relation to the dened SIL
level to achieve.
• Procedure:
— Operate the Actuator/Valve assembly for No. 2 open/close complete
cycles with complete closing of the valve.
— Verify the Correct performing of open – close manoeuvre (for example,
check locally, or automatically via Logic solver, the correct movement of
the actuator/valve).
Considering the application of the above described Full-Stroke Test procedure, the “Test
Coverage” can be considered 99%.
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