HAZOP & Process Safety interview questions

1. A.independent safeguards in order: process design, BPCS, alarms and operator, SIS, relief devices, physical containment and emergency response
2. B.semi-quantitative method multiplying initiating event frequency by the probability of failure on demand of each independent protection layer against a tolerable frequency target
3. C.standard deviation prompts No, More, Less, Reverse, Part of, As well as and Other than, combined with parameters like flow, pressure, temperature and level
4. D.section of the P&ID such as a line or vessel with a defined design intent, to which guidewords are applied one parameter at a time

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1. A.API 521 relief scenarios
2. B.API 520 PSV sizing
3. C.Fire case relief load
4. D.HAZOP node

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1. A.HAZOP node — standard deviation prompts No, More, Less, Reverse, Part of, As well as and Other than, combined with parameters like flow, pressure, temperature and level
2. B.HAZOP node — section of the P&ID such as a line or vessel with a defined design intent, to which guidewords are applied one parameter at a time
3. C.HAZOP node — quantitative risk assessment combining release frequencies with consequence modelling of dispersion, fire and explosion to produce individual and societal risk contours
4. D.HAZOP node — vapour generated by the API 521 heat input Q = 21000·F·A^0.82 (US units) over wetted area up to 25 ft above grade, with F reduced by insulation or drainage

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1. A.overpressure causes to be evaluated: blocked outlet, external fire, cooling failure, control valve failure, tube rupture and thermal expansion
2. B.relief valve orifice area computed from required relief rate, set pressure, back pressure and fluid properties for vapour, liquid or two-phase flow
3. C.quantitative risk assessment combining release frequencies with consequence modelling of dispersion, fire and explosion to produce individual and societal risk contours
4. D.standard deviation prompts No, More, Less, Reverse, Part of, As well as and Other than, combined with parameters like flow, pressure, temperature and level

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1. A.HAZOP guidewords
2. B.LOPA
3. C.API 521 relief scenarios
4. D.HAZOP node

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1. A.HAZOP guidewords — standard deviation prompts No, More, Less, Reverse, Part of, As well as and Other than, combined with parameters like flow, pressure, temperature and level
2. B.HAZOP guidewords — section of the P&ID such as a line or vessel with a defined design intent, to which guidewords are applied one parameter at a time
3. C.HAZOP guidewords — safety integrity level 1 to 4 defining probability-of-failure-on-demand bands; SIL 2 needs PFD between 10⁻³ and 10⁻² under IEC 61511
4. D.HAZOP guidewords — independent safeguards in order: process design, BPCS, alarms and operator, SIS, relief devices, physical containment and emergency response

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1. A.independent safeguards in order: process design, BPCS, alarms and operator, SIS, relief devices, physical containment and emergency response
2. B.relief valve orifice area computed from required relief rate, set pressure, back pressure and fluid properties for vapour, liquid or two-phase flow
3. C.safety integrity level 1 to 4 defining probability-of-failure-on-demand bands; SIL 2 needs PFD between 10⁻³ and 10⁻² under IEC 61511
4. D.quantitative risk assessment combining release frequencies with consequence modelling of dispersion, fire and explosion to produce individual and societal risk contours

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1. A.HAZOP node
2. B.Layers of protection
3. C.Fire case relief load
4. D.SIL

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1. A.Layers of protection — quantitative risk assessment combining release frequencies with consequence modelling of dispersion, fire and explosion to produce individual and societal risk contours
2. B.Layers of protection — independent safeguards in order: process design, BPCS, alarms and operator, SIS, relief devices, physical containment and emergency response
3. C.Layers of protection — semi-quantitative method multiplying initiating event frequency by the probability of failure on demand of each independent protection layer against a tolerable frequency target
4. D.Layers of protection — safety integrity level 1 to 4 defining probability-of-failure-on-demand bands; SIL 2 needs PFD between 10⁻³ and 10⁻² under IEC 61511

Answer + AI explanation with Pro

1. A.standard deviation prompts No, More, Less, Reverse, Part of, As well as and Other than, combined with parameters like flow, pressure, temperature and level
2. B.semi-quantitative method multiplying initiating event frequency by the probability of failure on demand of each independent protection layer against a tolerable frequency target
3. C.Fire and Explosion Index that scores a material factor with general and special process hazards to rank units and set spacing and protection
4. D.independent safeguards in order: process design, BPCS, alarms and operator, SIS, relief devices, physical containment and emergency response

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1. A.SIL
2. B.LOPA
3. C.API 521 relief scenarios
4. D.HAZOP node

Answer + AI explanation with Pro

1. A.LOPA — quantitative risk assessment combining release frequencies with consequence modelling of dispersion, fire and explosion to produce individual and societal risk contours
2. B.LOPA — independent safeguards in order: process design, BPCS, alarms and operator, SIS, relief devices, physical containment and emergency response
3. C.LOPA — overpressure causes to be evaluated: blocked outlet, external fire, cooling failure, control valve failure, tube rupture and thermal expansion
4. D.LOPA — semi-quantitative method multiplying initiating event frequency by the probability of failure on demand of each independent protection layer against a tolerable frequency target

Answer + AI explanation with Pro

1. A.standard deviation prompts No, More, Less, Reverse, Part of, As well as and Other than, combined with parameters like flow, pressure, temperature and level
2. B.independent safeguards in order: process design, BPCS, alarms and operator, SIS, relief devices, physical containment and emergency response
3. C.relief valve orifice area computed from required relief rate, set pressure, back pressure and fluid properties for vapour, liquid or two-phase flow
4. D.safety integrity level 1 to 4 defining probability-of-failure-on-demand bands; SIL 2 needs PFD between 10⁻³ and 10⁻² under IEC 61511

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1. A.LOPA
2. B.QRA
3. C.Dow F&EI
4. D.SIL

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1. A.SIL — overpressure causes to be evaluated: blocked outlet, external fire, cooling failure, control valve failure, tube rupture and thermal expansion
2. B.SIL — relief valve orifice area computed from required relief rate, set pressure, back pressure and fluid properties for vapour, liquid or two-phase flow
3. C.SIL — safety integrity level 1 to 4 defining probability-of-failure-on-demand bands; SIL 2 needs PFD between 10⁻³ and 10⁻² under IEC 61511
4. D.SIL — section of the P&ID such as a line or vessel with a defined design intent, to which guidewords are applied one parameter at a time

Answer + AI explanation with Pro

1. A.relief valve orifice area computed from required relief rate, set pressure, back pressure and fluid properties for vapour, liquid or two-phase flow
2. B.quantitative risk assessment combining release frequencies with consequence modelling of dispersion, fire and explosion to produce individual and societal risk contours
3. C.section of the P&ID such as a line or vessel with a defined design intent, to which guidewords are applied one parameter at a time
4. D.vapour generated by the API 521 heat input Q = 21000·F·A^0.82 (US units) over wetted area up to 25 ft above grade, with F reduced by insulation or drainage

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1. A.Dow F&EI
2. B.API 520 PSV sizing
3. C.Layers of protection
4. D.HAZOP guidewords

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1. A.API 520 PSV sizing — relief valve orifice area computed from required relief rate, set pressure, back pressure and fluid properties for vapour, liquid or two-phase flow
2. B.API 520 PSV sizing — Fire and Explosion Index that scores a material factor with general and special process hazards to rank units and set spacing and protection
3. C.API 520 PSV sizing — independent safeguards in order: process design, BPCS, alarms and operator, SIS, relief devices, physical containment and emergency response
4. D.API 520 PSV sizing — standard deviation prompts No, More, Less, Reverse, Part of, As well as and Other than, combined with parameters like flow, pressure, temperature and level

Answer + AI explanation with Pro

1. A.overpressure causes to be evaluated: blocked outlet, external fire, cooling failure, control valve failure, tube rupture and thermal expansion
2. B.semi-quantitative method multiplying initiating event frequency by the probability of failure on demand of each independent protection layer against a tolerable frequency target
3. C.relief valve orifice area computed from required relief rate, set pressure, back pressure and fluid properties for vapour, liquid or two-phase flow
4. D.independent safeguards in order: process design, BPCS, alarms and operator, SIS, relief devices, physical containment and emergency response

Answer + AI explanation with Pro

1. A.Layers of protection
2. B.API 520 PSV sizing
3. C.API 521 relief scenarios
4. D.QRA

Answer + AI explanation with Pro

1. A.API 521 relief scenarios — safety integrity level 1 to 4 defining probability-of-failure-on-demand bands; SIL 2 needs PFD between 10⁻³ and 10⁻² under IEC 61511
2. B.API 521 relief scenarios — vapour generated by the API 521 heat input Q = 21000·F·A^0.82 (US units) over wetted area up to 25 ft above grade, with F reduced by insulation or drainage
3. C.API 521 relief scenarios — overpressure causes to be evaluated: blocked outlet, external fire, cooling failure, control valve failure, tube rupture and thermal expansion
4. D.API 521 relief scenarios — quantitative risk assessment combining release frequencies with consequence modelling of dispersion, fire and explosion to produce individual and societal risk contours

Answer + AI explanation with Pro

1. A.quantitative risk assessment combining release frequencies with consequence modelling of dispersion, fire and explosion to produce individual and societal risk contours
2. B.semi-quantitative method multiplying initiating event frequency by the probability of failure on demand of each independent protection layer against a tolerable frequency target
3. C.vapour generated by the API 521 heat input Q = 21000·F·A^0.82 (US units) over wetted area up to 25 ft above grade, with F reduced by insulation or drainage
4. D.overpressure causes to be evaluated: blocked outlet, external fire, cooling failure, control valve failure, tube rupture and thermal expansion

Answer + AI explanation with Pro

1. A.Dow F&EI
2. B.SIL
3. C.Fire case relief load
4. D.API 520 PSV sizing

Answer + AI explanation with Pro

1. A.Fire case relief load — overpressure causes to be evaluated: blocked outlet, external fire, cooling failure, control valve failure, tube rupture and thermal expansion
2. B.Fire case relief load — relief valve orifice area computed from required relief rate, set pressure, back pressure and fluid properties for vapour, liquid or two-phase flow
3. C.Fire case relief load — vapour generated by the API 521 heat input Q = 21000·F·A^0.82 (US units) over wetted area up to 25 ft above grade, with F reduced by insulation or drainage
4. D.Fire case relief load — safety integrity level 1 to 4 defining probability-of-failure-on-demand bands; SIL 2 needs PFD between 10⁻³ and 10⁻² under IEC 61511

Answer + AI explanation with Pro

1. A.relief valve orifice area computed from required relief rate, set pressure, back pressure and fluid properties for vapour, liquid or two-phase flow
2. B.Fire and Explosion Index that scores a material factor with general and special process hazards to rank units and set spacing and protection
3. C.section of the P&ID such as a line or vessel with a defined design intent, to which guidewords are applied one parameter at a time
4. D.quantitative risk assessment combining release frequencies with consequence modelling of dispersion, fire and explosion to produce individual and societal risk contours

Answer + AI explanation with Pro

1. A.HAZOP node
2. B.LOPA
3. C.QRA
4. D.Dow F&EI

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1. A.Dow F&EI — relief valve orifice area computed from required relief rate, set pressure, back pressure and fluid properties for vapour, liquid or two-phase flow
2. B.Dow F&EI — safety integrity level 1 to 4 defining probability-of-failure-on-demand bands; SIL 2 needs PFD between 10⁻³ and 10⁻² under IEC 61511
3. C.Dow F&EI — section of the P&ID such as a line or vessel with a defined design intent, to which guidewords are applied one parameter at a time
4. D.Dow F&EI — Fire and Explosion Index that scores a material factor with general and special process hazards to rank units and set spacing and protection

Answer + AI explanation with Pro

1. A.standard deviation prompts No, More, Less, Reverse, Part of, As well as and Other than, combined with parameters like flow, pressure, temperature and level
2. B.semi-quantitative method multiplying initiating event frequency by the probability of failure on demand of each independent protection layer against a tolerable frequency target
3. C.overpressure causes to be evaluated: blocked outlet, external fire, cooling failure, control valve failure, tube rupture and thermal expansion
4. D.quantitative risk assessment combining release frequencies with consequence modelling of dispersion, fire and explosion to produce individual and societal risk contours

Answer + AI explanation with Pro

1. A.HAZOP guidewords
2. B.API 521 relief scenarios
3. C.Layers of protection
4. D.QRA

Answer + AI explanation with Pro

1. A.QRA — overpressure causes to be evaluated: blocked outlet, external fire, cooling failure, control valve failure, tube rupture and thermal expansion
2. B.QRA — relief valve orifice area computed from required relief rate, set pressure, back pressure and fluid properties for vapour, liquid or two-phase flow
3. C.QRA — quantitative risk assessment combining release frequencies with consequence modelling of dispersion, fire and explosion to produce individual and societal risk contours
4. D.QRA — safety integrity level 1 to 4 defining probability-of-failure-on-demand bands; SIL 2 needs PFD between 10⁻³ and 10⁻² under IEC 61511

Answer + AI explanation with Pro