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SIL Safety Manual
SM-025-GVO Rev. 0
The parameters to be measured depends upon the partial stroke test system available.
Instruments / equipment to be used for the test:
The Partial Stroke Test can be executed in the following way:
1.
2.
3.
Table 5.
Linear position of the shaft
Time necessary to reach the
final position
Periodic Test and Maintenance Requirements
Section 8: Periodic Test and Maintenance Requirements
Using commercial PST device, measuring/verifying:
a.
Measurement of linear position as function of time (pressure measure-
ment is optional)
b.
Measurement of cylinder chamber pressure as function of time
c.
Verification of final position achievement in the established maximum
time.
By means of Logic Solver, measuring/verifying:
a.
Measurement of linear position as function of time (pressure measure-
ment is optional)
b.
Measurement of cylinder chamber pressure as function of time
c.
Verification of final position achievement in the established maximum
time.
By means of a manual PST system manufactured by Emerson (slightly different sys-
tems can be available: please make reference to the documentation of the specific
project)
Quality
Case A: use of a Logic Solver:
1. Limit switches box, or
4÷20 mA position transmitter
2. Digital Input Module /
Analog Input Module
included in the Logic Solver
3. Application SW function
(to compare the actual trend
with the one stored during
SAT)
Case B: use of a PST device:
4. Limit switches box, or
4÷20 mA position transmitter
5. PST device with integrate
SW function
As above
Instruments / equipment
Automatic Procedure
November 2017
Manual Procedure
1. Limit switches box, with
visual indication
2. Skilled and trained personnel
1. Chronometer
2. Skilled and trained personnel
17
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