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General Requirements
The following general requirements for the SVI II ESD must be adhered to:
Installation
All issues related to installation are outlined below.
SVI II ESD Installation Configurations
Refer to "SVI II ESD Configurations" on page 41.
Physical Location and Placement Guidelines
Refer to "Physical Location and Placement Guidelines" on page 23.
Pneumatic Connections
Refer to "Pneumatic Connections" on page 35.
Electrical Connections
Refer to"Electrical Connection Guidelines" on page 40
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The system's response time must be less than process safety time. The SVI II
ESD switches to its fail safe state in less than 100 ms. Response time is
actuator dependent.
You must add the SVI II ESD response time to actuator/valve response to get
overall response time.
All SIS components including the SVI II ESD must be operational before
process start-up. The internal diagnostic test that monitors the 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 must 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 the SVI II ESD's nameplate is properly marked.
Personnel performing maintenance and testing on the SVI II ESD must be
qualified to do so.
Results from the PST and proof tests must be recorded and reviewed
periodically.
The useful life of the SVI II ESD is discussed in the Failure Modes, Effects and
Diagnostic Analysis Report for the SVI II ESD.
Masoneilan SVI II ESD Quick Start Guide =| 17
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