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SAFETY INSTRUMENTED SAFETY INSTRUMENTED SYSTEM (SIS) FOR PROCESS SYSTEM (SIS) FOR PROCESS OPERATION BASED ON REAL- - OPERATION BASED ON REAL TIME MONITORING TIME MONITORING by Cen Kelvin Nan by Cen Kelvin Nan


  1. SAFETY INSTRUMENTED SAFETY INSTRUMENTED SYSTEM (SIS) FOR PROCESS SYSTEM (SIS) FOR PROCESS OPERATION BASED ON REAL- - OPERATION BASED ON REAL TIME MONITORING TIME MONITORING by Cen Kelvin Nan by Cen Kelvin Nan

  2. �������� �������� � Background Background � � Research Contributions Research Contributions � � Proposed Methodology Proposed Methodology � � Case Study Case Study � � Conclusions Conclusions � � Future Works Future Works � � Acknowledgements Acknowledgements �

  3. ���������� ���������� Safety Instrumented System (SIS) Safety Instrumented System (SIS) ������������� ������������� � A system independent of Basic Process Control A system independent of Basic Process Control � System (BPCS), is designed to take action to System (BPCS), is designed to take action to maintain the process safety in the event of maintain the process safety in the event of Safety Instrumented malfunction malfunction System (SIS) � “a system composed of sensors, logic solvers and “ a system composed of sensors, logic solvers and � final- -control elements for the purpose of taking the control elements for the purpose of taking the final process to a safe state, when predetermined process to a safe state, when predetermined Basic Process conditions are violated” ” IEC 61508 (2000) conditions are violated IEC 61508 (2000) Control System (BPCS) Operating Process ������������������������������������������������ ������������������������������������������������ SIS VS BPCS SIS VS BPCS

  4. ��������������� ��������������� An example of SIS An example of SIS �������������� �������������� � � ��������������������� ��������������������� ���������������������� ���������������������� ��������� �������� ��������� �������� ����! ����! �"����������� �"����������� � � ����������������#��� ����������������#��� ������$������� ������$������� %���������������� %���������������� � � ����#��������������� ����#��������������� ��#������������������� ��#������������������� ���&�������' ���&�������' %���(������������� %���(������������� � � ����������������#��� ����������������#��� ��������������������)� ��������������������)� ���������������� ���������������� ������������ ������������ What Happen if no operator notice the alarm ???

  5. ��������������� ��������������� An example of SIS An example of SIS %����*������������ %����*������������ � � ����������������� ����������������� �)������������� �)������������� ��������� ��������� � � ������������)������� ������������)������� #��#���+, ,����������� ����������� #��#���+ �)��������� �)��������� %���������������*� %���������������*� � � �������)������������� �������)������������� ���������������� ���������������� ����������������-��� ����������������-��� �������-��� �������-���

  6. ��������������� ��������������� Safety Function (SF) Safety Function (SF) �������������)�.��������� �������������)�.��������� � “Function to be implemented by a SIS, other “ Function to be implemented by a SIS, other � technology safety- -related system or external risk, related system or external risk, technology safety %������������������ %������������������ � � reduction facilities, which is intended to achieve or reduction facilities, which is intended to achieve or ��������������� ��������������� ��������������������� maintain a safe state for the process, with respect to a maintain a safe state for the process, with respect to a ��������������������� ������������������� ������������������� specific hazardous event” ” specific hazardous event ( IEC 61508 , 2003 ( IEC 61508 , 2003 ) ) ������ ������ A set of specific actions to be taken under specific � � A set of specific actions to be taken under specific /�#�������������� /�#�������������� � � ������������������� circumstances, which will move the chemical process ������������������� circumstances, which will move the chemical process ����������������� ����������������� from a potentially unsafe state to a safe state from a potentially unsafe state to a safe state ������������������� ������������������� ( Edward and Kevin, 2003 ( Edward and Kevin, 2003 ) ) �����)���������� �����)����������

  7. ��������������� ��������������� Developing a safety instrumented system can be regarded as designing one or more corresponding safety functions. One Goal: Propose a general general safety function which can be considered as a principal methodology to develop the part of each SIS. This function is called fault diagnosis diagnosis function . SIS through designing fault function diagnosis function, which can be used in various process systems Fault Diagnosis Function: Fault Diagnosis Function: � is among the objectives of the monitoring and falls is among the objectives of the monitoring and falls � under a total process of supervision under a total process of supervision (Sharif Sharif and and Grosvenor Grosvenor, 1998) , 1998) ( is to monitor the process through the real- -time time is to monitor the process through the real � � information from the lower level (sensors) and take information from the lower level (sensors) and take actions on higher level (controllers) actions on higher level (controllers) � a common approach which can be applied to detect a common approach which can be applied to detect � over- -all faults and even faults in components all faults and even faults in components over

  8. 0��������������������� 0��������������������� � Propose a methodology for real Propose a methodology for real- -time fault time fault � diagnosis in process system and its use in diagnosis in process system and its use in developing real- -time SIS time SIS developing real � Implement the proposed methodology by Implement the proposed methodology by � developing a computer based tool developing a computer based tool � Study and evaluate the performance of the Study and evaluate the performance of the � proposed methodology using developed tool. . proposed methodology using developed tool

  9. "��������1���������) "��������1���������) The proposed methodology implementation is divided into three The proposed methodology implementation is divided into three stages stages Stage 1 System Simulation Stage 2 Knowledge-based Fault Diagnosis Stage 3 G2 Application Development

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