ME508 Safety Instrumented Systems

Question:

To allow for unforeseen circumstances such as illness, work or family commitments, it is advisable that you aim to complete the assessment a few days before the due date. It is your responsibility to ensure that you factor in any time difference between Perth, Western Australia and your location when submitting assessments.

Extension requests must be formally submitted by completing an extension request form and emailing the form to your unit coordinator along with a medical certificate or other supporting documentations.

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A Safety Instrumented System (SIS) is required to implement a Safety Instrumented Function (SIFs) identified in the hazard identification and risk assessment study as:

1. Feed gas valve should be prevented from opening until minimum air flow is present for 10 minutes and exit temperature is between 650oC and 750oC;

2. Provide an indicator X1-2 to indicate that the SIS and the plant conditions are available for startup and provide a trip/reset pushbutton HS-2 for the operator to initiate the startup;

3. The temperature dip condition at the initial stage (60 seconds) should be allowed for and the SIF automatically bypassed on startup;

4. After 60 seconds temperature excursion beyond the temperature Hi and Lo limits will initiate the feed gas supply to be shut off;

5. The safe state of the process is when the feed gas valve is closed and air feed has been flowing above minimum for more than 10 minutes.

6. Risk reduction requirements call for Safety Integrity Level of 1 (SIL 1).

Management of functional safety requires an organization to define how it will address the following requirements:

1. Management of functional safety

2. Responsibilities of departments and individuals

3. Documentation scope and document management systems

4. Engineering procedures

5. Management of functional safety software

6. Competency and training of staff

7. Management of change

In a particular operating company, the overall functional safety management for a SIS project is required to be defined and implemented.

a) What are the components of Functional Safety Management (FSM) Plan which must be addressed by the project?

b) As a part of the FSMP, a responsibility matrix is drawn-up as given below.

I. Describe the role and responsibility of each Particpant under the FSM column.

II. Complete the activities in the matrix with the roles for respective agencies, from the following activity options:

· Responsible
· Contributes
· Approves
· Provide data
· Provide certification
· Provide validation