© 2016 General Electric Company. All rights reserved. Masoneilan SVI II ESD Installation and Maintenance Manual =| 1157. Partial Stroke TestingOverviewKey components of Safety Instrumented System (SIS) are final control elements such asemergency shutdown devices, i.e. SVI II ESD. SVI II ESD and its associated valve are notcontinually moving like a typical control valve, but are normally expected to remain static in oneposition and then operate reliably upon an emergency event occurrence. Valves remaining inthe same position for long periods of time can be become stuck and won’t operate whenneeded. 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, withoutremoving it from the SIS. SVI II ESD allows you to automatically, or on demand, perform a PartialStroke Test (PST) which returns relevant data concerning valve operation and can allow you todetect potentially dangerous failures. PST partially strokes the valve and returns data about thevalve’s performance.SVI II ESD is the most advanced PST device with the most integrated sensors to provide completediagnostic coverageSome 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 HealthPST only runs when the SVI II ESD is configured as ATO (Air To Open). Youcan configure the SVI II ESD with the LCD/Pushbutton display or usingValVue ESD. A trial version of ValVue ESD is provided with every SVI II ESD.Refer to the ESD Help file for further information.NOTE
