Dresser Masoneilan

SVI II ESD Emergency Shutdown Device

SIL 3 Partial Stroke Test Solution

The SVI® II ESD can be implemented using a 4-20mA signal, 0-24Vdc or a combination of both. The single 4-20mA solution is most desirable as it is SIL3 capable while at 4mA, allowing the device to execute the safety function while active. Substantial benefits are realized in capturing shutdown events, allowing continuous HART communications during a trip and facilitating local panel annunciation using the built-in discrete outputs.

In terms of PST execution, the following are available: local LCD display, remote HART access, remote use of 4-20mA analog signal , and finally, built-in scheduler functionality. The SVI II ESD automatically captures the PST in its non-volatile memory and stores the analysis. Two signatures can be stored, allowing the Valvue ESD Lookout software to automatically and regularly synchronize its database with field data. This software can be standalone or integrated.

TUV Certificate

EXIDA Certificate

More Information

Selection Criteria

The SVI II ESD is an advanced solution for emergency shutdown valves. It is certified by TUV for usage in safety critical applications per IEC61508. It is a reliable, digital-based technology that replaces solenoid-based solutions for ON/OFF pneumatic actuator applications. In a single compact package, the SVI II ESD provides a dependable emergency shutdown device with a partial stroke test controller. It is equipped with multiple sensors capable of diagnosing itself and the integrity of an emergency shutdown valve.

Depending on the model, the SVI II ESD opens and closes an ON/OFF valve using either a 4-20mA signal, a 0-24Vdc or a combination of both.

It is capable of executing a partial stroke test remotely using HART or a patent-pending analog signal. It is also capable of local operations with the use of its built-in explosion-proof LCD interface, and it has a built-in calendar with diagnostic storage function for automated partial stroke tests. It is rated explosion-proof and intrinsically safe by several worldwide agencies.

Key Features

ESD function and PST function on a single wire pair
Reduced installation cost
Emergency Shudown function independant of partial stroke tests
Versatility in implementing partial stroke tests
Execution of ESD valve PST from any logic solver
SIL3 while at 4mA
Shutdown event captured
Confirm ESD operations
Automatic analysis of ESD valve health
Software automatically captures and archives PST signatures
Integration of diagnostics with logic solvers
High diagnostic coverage factor
Multiple inputs and outputs including
- 4-20mA valve position transmitter
- 2 Solid state switches
- 1 Discrete input
- 1 Transmitter input for tight shutoff flow measurement"

Benefits

Extend the duration between full proof tests without disturbing process Reliable and repeatable testing of ESD Valves
Improve the safety integrity level (SIL) of emergency isolation valve applications
Reduce cost of safety compliance
User friendly setup and operations
Universal design improves asset utilization
Improved testing methods to comply with safety regulations

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