Turbine Trip Block. State of the Art Protection System APPLICATION SUMMARY INTRODUCTION TO FSD/IMI DESIGN AND
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1 Turbine Trip Block State of the Art Protection System APPLICATION SUMMARY AND INTRODUCTION TO FSD/IMI DESIGN
2 Turbine Speed Control and Safety System
3 Turbine Tripping Principal Each Steam Turbine Has a Trip /Trip & Throttle Valve Normally TTV/TVs opens by Hydraulic Oil pressure acting against an spring When the oil pressure in actuator drops, spring load closes the valve quickly All turbine trip signals need to drain the control oil from TTV/TV actuator As per API 612, draining of the oil will be done by minimum two Solenoid valves. Solenoid Valves need to be fast open valves and normally need to be de energize for shutting down the turbine
4 API 612 Requirement : The turbine shall be provided with a minimum of two, separate electro hydraulic solenoid operated valves located in the shutdown system. Remarks: TWO Separate valves in 1oo2 arrangement assure Safety, but not Availability The best protection system in accordance with to IEC is ineffective without any appropriate trip component
5 Safety and Availability 1oo2 Provides Safety 2oo2 Provides Availability 2oo3 Provides Safety and Availability
6 Sample Traditional Trip System PID
7 Sample Traditional Trip System
8 Disadvantageous of Traditional Trip System API requirements met with 2 solenoid valves. (1oo2 Voting) How about Availability?! Any false signal or de energizing the solenoid valves for power cutoff reasons can cause turbine trip. Having lots of connections and piping elements can cause oil leakage in high temperature hazardous area which can in worst case represent a significant explosion hazard. Larger installation footprint and complexity of operation and test. Solenoid valves can be SIL certified but not all the system!
9 Solutions API requires 2 valve As MINIMUM and most OEMs follow the minimum requirements only! But there must be better way to increase availability and reliability! Using 2oo3 voting in a trip block which guarantees both safety and availability.
10 Safe and Available 2oo3 Arrangement 3 Solenoid Valves for Tripping the Turbine Partial Stroke Test Trip and Throttle Valve / Trip Valve
11 How It Works Normal Condition Valves in Normal Position Turbine in Operation
12 How It Works - False Signal (1oo3) One Valve de energized by false signal Turbine in Operation
13 How It Works 2oo3 Tripping 2 Valves De energized Turbine Tripped
14 How It Works Normal Shut Down (3oo3) All Valves De energized Turbine Tripped
15 Redundant 2oo3 Arrangement- Increased Reliability One Set of valves in operation, and the other set can be tested (diagnosis) even the time turbine is in services Selector Valve 3 Solenoid Valves for Tripping the Turbine 3 Solenoid Valves for Tripping the Turbine
16 General Arrangement of 2oo3 Trip Block Very Compact Design
17 Advantageous Reliable actuation of the trip valve in combination with prevention of erroneous actuations Increased availability by implementing 2oo3 voting logic Compact Design in mono-block facilitates intonation and retrofit and simplify piping layout Possibility of monitoring trip valve position Only 3 connections: Oil header, oil drain and Trip valve connection: Less leakage possibility SIL3 Certified Components and System Supports testing during turbine operation Stainless Steel Component Fast Trip Time Remote position indication capability of solenoid valves Certified for Hazardous Area Minimized Maintenance Requirement Additional custom smart module capability as per requirement
18 Contact Us: Unit B7, No.178, Marzdaran Blvd., Tehran Iran Tel:
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