Distributed and adaptive smart logic with multi-communication apparatus for reliable safety system shutdown

一种安全逻辑、逻辑的技术，应用在通用控制系统、安全安排、控制/调节系统等方向，能够解决缺乏跳闸等问题

Inactive Publication Date: 2011-05-25
SAUDI ARABIAN OIL CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] A major deficiency in prior art systems is the lack of a method that will trip the process only on true request signals
Prior art field devices are unable to self-diagnose at the field level and communicate their respective "health" or operational status back to the SLS over a secure communication network

Method used

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  • Distributed and adaptive smart logic with multi-communication apparatus for reliable safety system shutdown
  • Distributed and adaptive smart logic with multi-communication apparatus for reliable safety system shutdown
  • Distributed and adaptive smart logic with multi-communication apparatus for reliable safety system shutdown

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Embodiment Construction

[0034] Reference will now be made in detail to the implementation of the invention, examples of which are illustrated in the accompanying drawings.

[0035] figure 1 Represents the topology of a typical prior art safety instrumented system employing FF-SIS networks. Safety logic solvers are hardwired to field devices via input / output ("I / O") racks. These field devices include sensors that monitor process variables such as pressure, temperature, fluid level, and flow, which are represented above pressure vessels. The field devices also include terminal elements such as valve actuators and local control panels shown associated with isolation valves EIV-1 and EIV-2. As can be seen, a break in a wire can result in a loss of signal from a sensor or terminal element, or loss of a control signal to a terminal device. Similarly, degradation of the signal can result in a false trip initiated by the SLS.

[0036] As an example, an EIV is open during normal operation and closed durin...

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Abstract

A safety instrumented systems (''SIS'') for monitoring and controlling chemical and other industrial process field devices that are responsive to signals for the emergency shutdown of the process or system includes associated process safety logic solver units with a hardwired communication network and a wireless communication network, each of which networks is connected to the safety logic solver and to each of the multiple field devices in order to significantly improve the reliability of communications in the event of the emergency shutdown system, reduce unwanted trips, and adapt to process conditions by failing to safe mode in dynamic conditions that are beyond the capability of prior art logic solvers.

Description

technical field [0001] The present invention relates to safety instrumented systems ("SIS") for monitoring and controlling chemical and other industrial process field devices and which respond to signals for emergency shutdown of the process or system. By not being in safe mode under dynamic conditions not considered by prior art logic solvers, this patent will significantly improve communication reliability within emergency shutdown systems, reduce unplanned trips, and adapt to process conditions. Background technique [0002] Refineries, chemical manufacturing and processing plants, and other facilities have established relatively sophisticated safety systems that include shut-off valves, automated valve controllers that will move valves from steady-state or safe process positions (regardless of whether it is open or closed) to the emergency stop position. These emergency stop valves and controls must be tested periodically to ensure that: they will be operable and respon...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/757
CPCG05B9/03
Inventor A·达赖塞赫P·S·弗兰德尔斯
Owner SAUDI ARABIAN OIL CO
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