Autonomous ESD Valve Control During Power and Communication Loss
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Solution Overview
Problem
Existing emergency shutdown (ESD) systems in industrial settings face challenges when communication or power is lost, leading to unintended valve states and potential process disruptions, as ESD valves often rely on centralized control and power sources, limiting their ability to operate independently and adapt to changing conditions.
Innovation Solution
The development of an ESD system with ESD valves that include a central controller, local logic, and a local power supply, allowing them to operate independently of the central control system and power source, using system status information from a central status monitor and distributed control systems to determine and maintain appropriate fail-safe states, even in the absence of communication or power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ESD valves rely on centralized control and power sources, then system coordination and control are improved, but reliability and independence during communication or power loss deteriorate
Solution Approach 1:
The patent divides the centralized ESD system into distributed autonomous valve units, each with its own controller and power supply. Each valve becomes an independent segment capable of making local decisions about its fail-safe state without relying on the central control system, thereby maintaining reliability during communication or power loss while managing complexity through modular design.
Solution Approach 2:
Each ESD valve is equipped with autonomous capabilities including local controllers that can independently determine fail-safe states and local power supplies that provide independent energy sources. This self-service approach allows valves to operate and make safety decisions without external control or power, ensuring reliability when centralized systems fail.
2Reliability
If ESD valves operate independently with local control, then reliability during communication loss is improved, but system coordination and centralized monitoring deteriorate
Solution Approach 1:
The patent implements feedback mechanisms where each autonomous valve controller communicates its status and operational state back to the centralized system when available. This feedback loop allows the central system to maintain awareness of valve states and system conditions without compromising the valves' independent decision-making capabilities during communication loss.
Solution Approach 2:
The system pre-establishes fail-safe state logic and decision-making algorithms within each valve controller before communication loss occurs. Each valve is programmed with the knowledge and authority to determine its own fail-safe state based on pre-defined criteria, ensuring immediate autonomous response without waiting for centralized instructions.
3Ease of operation
If ESD valves use fixed fail-safe states, then simplicity of operation is improved, but adaptability to changing emergency conditions deteriorates
Solution Approach 1:
The patent enables ESD valves to dynamically adjust their fail-safe states based on real-time monitoring of changing conditions. Each valve controller continuously assesses system status and can transition between different fail-safe states (open, closed, or intermediate positions) as conditions evolve, providing adaptability while maintaining operational simplicity through automated decision logic.
Data Source
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AI summary
Provided in some embodiments are systems and methods for emergency shutdown (ESD) systems. Embodiments provide for receiving, from a central logic solver (CLS) of an emergency shutdown (ESD) system for a plant via a first communication channel, a command indicative of a first state for an ESD valve, in response to receiving the command, controlling the ESD valve to operate in the first state, obtaining, from a central status monitor (CSM) of the ESD system via a second communication channel, current status information for the plant, determining a second state for the ESD valve based at least in part on the current status information obtained from the CSM, and controlling the ESD valve to operate in the second state.