• Class and Course

    Safety Shutdown Systems

    This course will provide the participants with the knowledge necessary to gain and enhance their operational aptitude in the area of safety systems.  It will cover  the operation and basic hardware of Safety Instrumented Systems (SIS), Total Plant Shutdown Systems (TPS), Emergency Shutdown Systems (ESD), Process Shutdown Systems (PSD), and Unit Shutdown Systems (USD).

    An introduction of the different systems, as well as the design philosophy of the SIS will be provided. Differentiation between function of the control system versus the SIS will be discussed, as well as the levels of protection with respect to the risks present.  Evaluating and functionally testing of an SIS will also be covered. Attendees will learn how changes to the SIS must be managed to ensure reliability.

    The purpose of this course will be to develop in participants a working knowledge of various safety systems including an introduction to the TPS, ESD, PSD, and USD systems.  Permissives and interlocks are the basis of these systems and will be covered, along with logic solvers, which are an important part of shutdown systems.

    Day 1


    • Introduction to SIS
    • Design life cycle
    • Process control vs safety control
    • Protection layers
    • Safety integrity levels

    Participants will learn how the SIS provides protection, as a whole, to the plant in the event of an uncontrollable situation.  Hindsight, as well as foresight, must be employed in the design of the SIS system. The process control system must be separate from the SIS.  On the first day, attendees will learn about the SIS and how it is divided into various levels to ensure the safe operation of the plant.

    Day 2

    SIS, TPS, ESD, PSD, and USD

    • Introduction to TPS, ESD, PSD, and USD
    • Permissives and interlocks
    • High reliability logic solver

    On day two, discussions of the SIS will continue and expand to topics of evaluating risk, initial system evaluation, functional testing, managing changesm, and determining system reliability.  Participants will be made aware of the important step in designing the SIS system, which is to establish the risks involved in operating the plant. Procedures must be in place to continually evaluate, manage changes, and assess the reliability of the SIS. Participants will be exposed to how SIS can be divided into the TPS, ESD, PSD, and USD systems, as well as how these systems rely on the appropriate hardware and software to maintain reliably.

    Day 3

    TPS, ESD, PSD, and USD

    • Failure modes
    • Alarms
    • Redundancy (TMR)
    • Resetting testing and bypassing
    • Documentation and cause and effect drawings

    On day three, the participants will become familiar with the characteristics of typical TPS, ESD, PSD, and USD systems.  Standards in alarm systems will be covered and the use of redundancy will be demonstrated to ensure shutdown system reliability.  The importance of resetting, testing, and bypassing procedures will be identified. The use of cause and effect drawings will be demonstrated to show participants how the shutdown systems will operate in a facility specific application.

    This course is mainly targeted to process operators, process technologists, and laboratory and maintenance personnel. The course can also be applicable to employees working with equipment and materials purchasing, equipment procurement, job planning, as well as immediate supervisors to the working technicians.

    Participants should have some recent exposure to shutdown system terminology in the oil and gas industry.

    Currently there are no scheduled classes for this course.

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