Partial Stroke Testing; Overview - GE Masoneilan SVI II ESD Installation And Maintenance Manual

Smart valve interface with sil3 emergency shutdown pst controller

Table of Contents

7. Partial Stroke Testing

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

Minimal Valve Expertise required

No time wasted in getting Results

NOTE

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.

Auto-Analysis ESD Valve Health

PST Signatures Automatically Retrieved

Global View of ESD Health

Masoneilan SVI II ESD Installation and Maintenance Manual

| 115

Table of Contents