Reference Standards; Svi Ii Esd Device Description - GE Masoneilan SVI II ESD Installation And Maintenance Manual

Reference Standards

Listed below are Functional Safety reference standards related to the SVI II ESD:
IEC 61508: 2000 – Functional safety of electrical/electronic/programmable electronic
safety-related systems
ANSI/ISA 84.00.01-2004 (IEC 61511 Mod.) Functional Safety – Safety Instrumented
Systems for the Process Industry Sector

SVI II ESD Device Description

An ESD valve is a valve that operates to ensure that the process is brought to its safe state.
During normal operation, these ESD valves are typically energized to stay open (ATO). In case
of an unsafe situation, the ESD valve is de-energized by the Safety System. The SVI II ESD
device performs this shutdown function for Safety Instrumented Functions (SIF) that require
field devices to be certified for safety related applications according to IEC61508 as certified
by TUV for use up to SIL3 with an HFT of 0 in low demand applications. The built-in
microprocessor is used for valve diagnostics only. The microprocessor has no direct role in
performing the designated safety function therefore the SVI II ESD is considered a Type A
device.
The SVI II ESD is a valve controller which mounts on a pneumatically actuated valve assembly.
Its role is to position an emergency shutdown valve to 0% or 100% with a PFDavg in
accordance with IEC61508 for SIL3 application.
Because of its capability of monitoring data from its embedded sensors, the SVI II ESD is
capable of validating the health of its integral components. In addition, due to the ability of
partially stroking, the ESD valve while in normal operations (energized to stay open - ATO); it
becomes possible to validate the health of the valve and actuator assembly. Configurable
time based testing of the ESD valve reduces the PFDavg by detecting dangerous failures.
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