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Flashcards by Ben Jenner, updated more than 1 year ago
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Created by Ben Jenner
over 9 years ago
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Copied by Ben Jenner
over 9 years ago
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| Question | Answer |
| Define Failure | Deviation from normal design intent or operating standard |
| Define Hazard | A situation with the potential to cause death, injury, damage, losses or liabilities |
| Define Accident | An unplanned, uncontrolled event giving rise to death, injury, ill health, damage or loss. |
| Define Consequences | An outcome resulting from an accident. |
| Define Severities | A measure of the consequence |
| =================================== HAZOP =================================== | =================================== HAZOP =================================== |
| Define Hazard Analsysis | The identification of events which lead to a hazard and an analysis of way in which these event could occur and how likely harmful effects are |
| What does HAZOP stand for? | Hazard and operability studies |
| What actually is Hazop? | The application of a formal, systematic, critical examination of the intentions of new facilities to assess the hazard potential of mal-operation of pieces of equipment and the consequential effects on the facility as a whole. |
| Aims of Hazop | Aims to stimulate the imagination of designers and operators in a systematic manner so that they can identify the causes of potential hazards in the design. |
| Who carries out a HAZOP? | A team of experts |
| Define Intention (Re. an item in hazop) | How the part is expected to function |
| Define deviations (Re. an item in hazop) | deviations from the design intention which are discovered by systematic application of the guide words. |
| Define causes (Re. an item in hazop) | reasons why deviations might occur. Causes can be classified as realistic or unrealistic. |
| What can we do with unrealistic causes | reject them |
| Define Consequences (Re. an item in hazop) | the results of the deviations. |
| What are the collums of a HAZOP table left to right | |
| meaning of guidewords? NO/NOT MORE THAN/ LESS THAN AS WELL AS PART OF REVERSE OTHER THAN | Parameter is zero increase of decrease in a parameter qualitative increase qualitative decrease opposite subsitution |
| Give some standard process parameters the guide words may describe | • Pressure • Temperature • Flow |
| Give some examples of HAZOP application areas | • chemical • oil and gas • pharmaceutical • food processing • UAVS • fork lift truck activities • nuclear |
| HAZOP limitations | - Cannot detect every weakness (e.g. layout problems) - Cannot make up for lack of knowledge - Assumes system constructed and operated as designed. |
| =================================== FMEA =================================== | =================================== FMEA =================================== |
| What does FMEA stand for? | Failure mode and effects analysis |
| What does FMECA stand for? | Failure Mode, Effects and Criticality Analysis |
| What does FMECA include that FMEA doesn't | classification of each potential failure effect according to its severity |
| State and describe the 2 types of FMEA | • Product - Analysis of product and how failures effect product operation • Process - Analysis of product manufacturing, maintenance and usage and effect on product operation |
| State and describe the 2 FMEA Approaches | • Functional - sub assemblies considered e.g. A valve control system • Hardware - each component considered e.g. Sensor, controller, valve. |
| What are the first 6 stages of FMEA? | 1. Define the system 2. Construct block diagrams 3. Record all assumptions made 4. Define failure modes of system 5. Define failure modes of components 6. Complete FMEA worksheets. |
| FMEA Stage 1. What must the definition of the system include. | • What the system comprises • Boundaries and interfaces • Function in all operation modes • Environment profile • System phases • System mission and objectives |
| FMEA Stage 2. Hierarchical diagrams | |
| FMEA Standard table | |
| What are the last 2 stages of FMEA? | 7. Review worksheets to determine reliability critical components 8. Make recommendations for design improvements and further work |
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