Masoneilan Products SVI II ESD - GE Energy

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GE Energy SVI II ESD Quick Start SIL Capability exSILentia * tool is recommended for this purpose as it contains accurate models for the SVI II ESD and its failure rates. When using an SVI II ESD in a redundant configuration, include a common cause factor of 5% in safety integrity calculations. The failure rate data listed in the FMEDA report is only valid for the useful life time of an SVI II ESD. The failure rates increase sometime after this time period. Reliability calculations based on the data listed in the FMEDA report for mission times beyond the lifetime may yield results that are too optimistic, i.e. the calculated Safety Integrity Level will not be achieved. The SVI II ESD meets SIL 3 requirements as outlined below. Systematic Integrity The product has met manufacturer design process requirements of Safety Integrity Level (SIL) 3. These are intended to achieve sufficient integrity against systematic errors of design by the manufacturer. A Safety Instrumented Function (SIF) designed with this product must not be used at a SIL level higher than the statement without prior use justification by end user or diverse technology redundancy in the design. Random Integrity The SVI II ESD’s safety critical function is maintained by a Type A Device. Therefore based on the SFF > 90%, when the SVI II ESD is used as the only component in a final element subassembly, a design can meet SIL 3 @ HFT=0. When the final element assembly consists of many components (SVI II ESD, quick exhaust valve, actuator, isolation valve, etc.) the SIL must be verified for the entire assembly using failure rates from all components. This analysis must account for any hardware fault tolerance and architecture constraints. Safety Parameters For detailed failure rate information refer to the Failure Modes, Effects and Diagnostic Analysis Report for the SVI II ESD available from the factory. 8
Safety Information Connecting the SVI II ESD to the SIS Logic Solver Connecting the SVI II ESD to When connecting the SVI II ESD to the SIS logic solver follow these guidelines: General Requirements The SVI II ESD is connected to the safety rated logic solver which is actively performing the safety function. Connections must be made per the instructions supplied by the safety rated logic solver. The output rating of the I/O module must meet or exceed the electrical specifications of the SVI II ESD as referenced in ES727 ( “Hazardous Location Installation” on page 65). The following general requirements for the SVI II ESD must be adhered to: 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 1 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. 9
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Masoneilan Products SVI II ESD - GE Energy

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