Periodic Test and Maintenance Requirements
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 defined by the final integrator in relation to the defined 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%.
SIL Safety Manual
DOC.SILM.EEP.EN Rev. 0
April 2017
8
Section 7: Periodic Test and Maintenance Requirements
