1. Hazard and Operability Studies - HAZOP ChE 258 Chemical Process Safety University of Missouri - Rolla
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2. HAZOP Attributes Concepts Talk the Talk (Definitions) Example
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3. HAZOP An effective method to identify hazards
Developed to identify hazards in a process plant and to identify operability problems, though not hazardous, that could compromise the plant’s ability to achieve design productivity
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4. HAZOP Attributes
Purpose: Identification of hazard and operability problems.
When to use: Optimal to be applied to new plants, but when design is nearly firm and documented. May be applied to existing plants where a major redesign is planned. Also on existing facilities
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5. HAZOP Attributes
Type of Results: Qualitative identification of hazards and operating problems. Recommended changes in design, procedures. Recommend for follow on studies.
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6. HAZOP Attributes
Data Requirements: HazOp requires detailed plant description, PFD (Process Flow Diagram), P&ID (Piping and Instrumentation Diagram), Plant Layout, Operating and Start up procedures.
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7. HAZOP Attributes
Staff Requirements: Five to seven members on team with support for recording and reporting. Mix of engineers, operators, maintenance, safety, etc.
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8. HAZOP Attributes
Time and Cost: Depends on complexity of plant being analyzed. In general 3 hours for each major hardware item. Additional time for planning, team coordination and documentation.
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9. HAZOP Concept
Review plant by breaking it up into a series of nodes (major hardware or operation). The multidisciplinary team “brainstorms” the plant design or operating procedure.
The idea is that several experts working together can achieve more, i.e., “synergy”.
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10. HAZOP Talk the Talk (Define terms)
Study Nodes: The location on P&ID or procedures at which the process parameters are investigated for deviation
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11. HAZOP Talk the Talk
Intention: How the process is expected to operate in the absence of deviations at the study nodes.
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12. HAZOP Talk the Talk
Deviations: Departures from the intention which are discovered by applying the guide words (e.g. “more pressure”).
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13. HAZOP Guide Words No: Negation of design intent
Less: Quantitative decrease
More: Quantitative increase
Part of: Qualitative decrease
As well as: Qualitative increase
Reverse: Logical opposite of the intent
Other than: Complete substitution
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14. HAZOP Guide Words
Sooner or Later: Use for Other than when considering time
Where else: Use for Other than when considering position, sources, or destination
Higher or Lower: Use for More or Less when considering elevations, temperatures, or pressures
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15. HAZOP Talk the Talk
Causes: Identify the possible deviation. Search for credible cause for such a deviation. This is a meaningful deviation. Causes can be hardware, human error, external disruption, unanticipated process state, computer/power failure.
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16. HAZOP Talk the Talk
Consequences: These are the results of the deviations should they occur. Trivial consequences, relative to the study objective are dropped.
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17. HAZOP Procedure Summary
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18. HAZOP In Class Assignment
Work as a group with the Process flowsheet and P&ID diagram for the Williams-Otto process.
Perform a guide work HAZOP for the appropriate process component and guide word as listed on the assignment sheet.
Turn in your list of responses
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