Digital positioner for emergency shutdown valves

Masoneilan has entered the safety system arena with the SVIII ESD digital positioner, the latest technology in emergency shutdown valve automation and in-service valve partial stroking

The Masoneilan SVI II ESD is a product extension of the successful and highly reliable SVI II AP valve positioner.

The product, SIL3 compliant and designed in accordance with IEC61508, is suitable for use in safety instrumented functions.

According to Sandro Esposito, Masoneilan global product manager for digital solutions, "The SVI II ESD is a breakthrough in that it allows for a single wire-pair solution for both the safety shutdown function and partial stroke testing (PST) function with SIL3 compliance, virtually eliminating the need for solenoids.

Also, by maximising artificial intelligence at the device level through analysis of incoming data from multiple sensors, the user receives not just data but usable and actionable information regardless of the PST execution method".

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 analogue 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 synchronise its database with field data.

This software can be standalone or integrated.

Furthermore, to minimise integration risks, Masoneilan is devoted to supporting technologies such as EDDL and DTM.

In summary, Sandro Esposito explains that "The PST is implemented so that it does not interfere with the safety function.

The architecture of the product was designed by segregating the two functions.

It's just like having a dedicated brain for each function".

Finally, the SVI II ESD positioner also complies with various hazardous areas certifications (ATEX, FM, CSA ...).

For further information, do not hesitate to contact us, or visit our website.

Masoneilan Dresser is a leading provider of automated process control solutions.

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