General Requirements - GE Masoneilan SVI II ESD Installation And Maintenance Manual

General Requirements

The following general requirements for the SVI II ESD must comply to the following:
The system response time shall be less than process safety time. The SVI II ESD
switches to its fail safe state in less than 100ms. Response time is actuator dependent.
The end user must add the SVI II ESD response time to actuator/valve response to
obtain overall response time.
All SIS components, including the SVI II ESD, must be operational before process
start-up. The internal diagnostic test monitoring SVI II ESD for faults has a one hour test
interval. This test does not partial stroke the valve.
In order to use the PST as an automatic diagnostic tool the PST shall be scheduled
(using ValVue ESD) to run at least once per month or ten times within the expected
hazard demand interval, whichever comes first. Detailed failure rate data is specified
in the FMEDA report available from the factory.
You must verify that the SVI II ESD is suitable for use in safety applications by
confirming that SVI II ESD's nameplate is properly marked.
Personnel performing maintenance and testing on the SVI II ESD has to be qualified to
do so.
Results from the PST and proof tests shall be recorded and periodically reviewed.
The useful life of the SVI II ESD is discussed in the Failure Modes, Effects and Diagnostic
Analysis Report for the SVI II ESD.
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