Masoneilan SVI II ESD, Installation And Maintenance Manual

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Masoneilan SVI II ESD Installation and Maintenance Manual =
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7. Partial Stroke Testing
Overview
Key components of Safety Instrumented System (SIS) are final control elements such as
emergency shutdown devices, i.e. SVI II ESD. SVI II ESD and its associated valve are not
continually moving like a typical control valve, but are normally expected to remain static in one
position and then operate reliably upon an emergency event occurrence. Valves remaining in
the same position for long periods of time can be become stuck and won’t operate when
needed. To ensure integrity of the ESD valve, SVI II ESD requires periodic testing.
One of the great features of the SVI II ESD is the ability to test the safety valve on-line, without
removing it from the SIS. SVI II ESD allows you to automatically, or on demand, perform a Partial
Stroke Test (PST) which returns relevant data concerning valve operation and can allow you to
detect potentially dangerous failures. PST partially strokes the valve and returns data about the
valve’s performance.
SVI II ESD is the most advanced PST device with the most integrated sensors to provide complete
diagnostic coverage.
Some SVI II ESD Partial Stroke Testing features are:
ESD and PST Wiring All in One Auto-Analysis ESD Valve Health
Minimal Valve Expertise required PST Signatures Automatically Retrieved
No time wasted in getting Results Global View of ESD Health
PST only runs when the SVI II ESD is configured as ATO (Air To Open). You
can configure the SVI II ESD with the LCD/Pushbutton display or using
ValVue ESD. A trial version of ValVue ESD is provided with every SVI II ESD.
Refer to the ESD Help file for further information.
NOTE