Svi Ii Esd Applications And Designated Safety Function Activation - GE Masoneilan SVI II ESD Installation And Maintenance Manual

Smart valve interface with sil3 emergency shutdown pst controller

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Works with a 4-20 mA control signal as a set-point for 0% or 100% in conjunction with

a discrete 0-24 VDC signal as the safety trip trigger.

Communicates HART

In addition, SVI II ESD is a PST controller that mounts on a pneumatically actuated valve

assembly. Its role is to position an emergency shutdown valve to 0% or 100% with a

probability of failure on demand (PFD) in accordance with IEC61508 for SIL3 application (SIL =

Safety Integrity Level). It replaces solenoid valves, typically utilized to actuate a spring-return

actuator, while providing extensive online valve diagnostics.

SVI II ESD Applications and Designated Safety Function Activation

There are three (3) SVI II ESD configurations used to connect to the control system in four (4)

different scenarios. The three configurations are used exclusively and cannot be combined in

any way. The SIL 3 circuit has complete and independent control to set the IP output to a

de-energized state upon demand. The SIL 2 rated annunciation function is the SW #1. HART

and AO are user-configurable to be SIL 2 rated annunciation functions as well. The customer

is expected to use appropriate SIL rated device to receive at least one of these signals.

There are three SVI II ESD models available:

ASD Model - Analog Safety Demand; 2 Wire Analog Trigger, 4 - 20 mA signal, 2 wire

installations with HART

DSD Model - Discrete Safety Demand; 2 Wire Discrete Trigger, 24 VDC, 2 wire

installations with HART

A/DSD Model - Analog Setpoint with Discrete Safety Demand; 4 Wire Discrete Trigger, 4

- 20 mA signal, 2 wire installations with HART

24 VDC 2 wire for Safety System.

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=GE Oil & Gas

over existing wires (4-20 mA or 24 VDC)

communications.

communications for control system and

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