Operational Test - Emerson Bettis G Series Installation, Operation And Maintenance Manual

Section 7: Troubleshooting
December 2020
7.2

Operational Test

7.2.1
Upon successful completion of the above described Full Stroke Test procedure, the
"Test Coverage" can be considered 99%.
7.2.2
NOTE:
The above test is only applicable on systems equipped with a partial stroke feature.
50
Full Stroke Test
The "Full Stroke Test" ("On-line") must be performed to satisfy the PFD
(average probability of failure on demand) value. The full stroke test frequencies
will be defined by the final installer to achieve the defined SIL level.
7.2.1.1 Procedure
7.2.1.1.1 Stroke the actuator/valve assembly two complete open/close
cycles with complete closing of the valve.
7.2.1.1.2 Verify the open/close cycles functioned correctly
(e.g. check locally, or automatically via Logic solver, the correct
movement of the actuator/valve).
Partial Stroke Test (when requested)
The "Partial Stroke Test" ("On-line") can be performed to improve the PFD
and to satisfy PFD (average probability of failure on demand) value. A typical
AVG
partial stroke value is 15% of the stroke and the recommended test interval is
about everyone to three months.
7.2.2.1 Procedure
7.2.2.1.1 Operate the actuator/valve assembly for No° 1 open/close
cycles 15% of the stroke.
7.2.2.1.2 Verify the partial stroke test functioned correctly
(e.g. check locally, or automatically via Logic solver, or via the
PST system the correct movement of the actuator/valve was
15% of the stroke).
Installation, Operation and Maintenance Manual
VA-DC-000-1878 Rev. 0
AVG
value
AVG
Troubleshooting