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RISK & SAFETY MANAGEMENT
Valve Position Feedback Add-on
INCREASE PLANT UPTIMES
Individual Isolation Valves Solenoid Valves
ROTEX 2oo3 Redundant Valve Systems Using 3 Solenoid Valves
“The most advanced redundant system available in the market” Visual Indicators Manifold
In the modern plant operations for the Oil, Gas and Chemicals market, maximising plant uptime is essential. Therefore, technology that can reduce downtime by increasing Hardware Fault Tolerance can have significant financial and operational benefits. It is very well known and documented how redundant control systems can improve both the safety and protect against unplanned shutdowns (spurious trips). However, redundancy also increases system complexity, and this will lead to increased engineering and also servicing costs maintenance downtime as these complex systems are maintained.
There are four common configurations:
One out of One (1oo1) o Non redundant o No Safety improvement, HFT=0 o No Spurious Trip Tolerance, STT=0
One out of Two (1oo2) o Improves safety performance, HFT=1, SIL3 o Increases chance of spurious trips o Common in upstream o Does not improve uptime
Two out of Two (2oo2) o Reduces chance of Spurious Trip Tolerance, STT=1 o Therefore, improves uptime o Decreases safety performance o Common in downstream
www.ogv.energy I November 2023
Two out of Three (2oo3) o SIL3 Rated – typical HIPPS o Improves safety performance, HFT=1 o Reduces chance of spurious trip, STT=1 o Therefore, improves uptime o Complex to engineer using discrete components o Traditionally required a minimum of four solenoid valves
Rotex, solenoid valve position feedback addon provides valve poppet position using Reed switches that gives true indication of solenoid valve position and speed of switching, which could also be used to measure the overall health of the solenoid valve.
The Rotex RV323P is a unique (patent pending) 2oo3 redundant solenoid valve manifold system, designed to provide increased safety and availability using only three solenoid valves. This setup provides lowest infrastructure cost, just three control signals and a smaller number of feedbacks going back to the control room, which become significantly important for plants requiring Intrinsically Safe equipment as lesser number of Intrinsic Safe barriers are then needed reducing the cost even further. The individual solenoid valve isolation system allows the operator to test and replace (hotswap) the solenoid valves online without disabling the safety function. The truth table for these systems are much simpler and the diagnostics data is easier to understand and locate the problem in case of a solenoid valve failure. These systems use a smaller number of components providing highest safety and reliability.
For further Information, please contact: sales.europe@rotexautomation.com