Emerson EL-O-Matic F Series - Page 16

13
September 2018
SIL Safety Manual
DOC.SILM.EF.EN Rev. 1
Periodic Test and Maintenance Requirements
NOTE:
• If the test is automatic, then the Test Coverage can also considered as DC.
• If the test is manual, then the Test Coverage cannot be considered as DC.
Parameters to be measured:
The following parameters have to be measured for an effective Partial Stroke Test:
• Angular position of the shaft;
• Time necessary to reach to nal position;
• Output torque (as indirect measure, by means of the of pressure measurement in the
cylinder chamber)
NOTE:
Not all parameters are needed, but the following combinations can be used:
1. Measurement of angular position as function of time
(pressure measurement is optional).
2. Measurement of cylinder chamber pressure as function of time.
3. Verication of nal position achievement in the established maximum time.
The parameters to be measured depend 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. Using commercial Partial stroke testing device, measuring/verifying:
a. Measurement of angular position as function of time.
b. Measurement of cylinder chamber pressure as function of time (optional).
c. Verication of nal position achievement in the established maximum time.
2. By means of Logic Solver, measuring/verifying:
a. Measurement of angular position as function of time.
b. Measurement of cylinder chamber pressure as function of time (optional).
c. Verication of nal position achievement in the established maximum time.
Section 8: Periodic Test and Maintenance Requirements