Utilities & Offsites interview questions

1. A.Indian Boiler Regulations under the Boilers Act 1923 governing design, fabrication, inspection and annual certification of boilers above 22.75 litres and their steam piping
2. B.PSA or membrane units giving 95–99.5% purity for blanketing and purging, against cryogenic ASU for high purity; tank blanketing holds a slight positive pressure
3. C.ratio of dissolved solids in circulating to make-up cooling water, controlled by blowdown; typically 4–6 with silica held below about 150 ppm
4. D.continuous and intermittent removal of concentrated water to hold TDS below about 3500 ppm in water-tube boilers, with heat recovered in a flash vessel

Answer + AI explanation with Pro

1. A.Cooling tower approach and range
2. B.IBR 1950
3. C.Tank farm dyke design
4. D.Steam trap

Answer + AI explanation with Pro

1. A.IBR 1950 — dry oil-free air at about 7 bar with dew point at least 10 °C below the lowest ambient per ISA 7.0.01, backed by a receiver for 15–20 minutes of autonomy
2. B.IBR 1950 — Indian Boiler Regulations under the Boilers Act 1923 governing design, fabrication, inspection and annual certification of boilers above 22.75 litres and their steam piping
3. C.IBR 1950 — approach is outlet water temperature minus ambient wet-bulb (typically 4–5 °C); range is inlet minus outlet water temperature
4. D.IBR 1950 — enclosure holding at least the largest tank's full capacity (110% for the largest tank under OISD-118), with floating roofs for volatile products and inter-tank spacing

Answer + AI explanation with Pro

1. A.ratio of dissolved solids in circulating to make-up cooling water, controlled by blowdown; typically 4–6 with silica held below about 150 ppm
2. B.approach is outlet water temperature minus ambient wet-bulb (typically 4–5 °C); range is inlet minus outlet water temperature
3. C.automatic valve that discharges condensate and air while holding steam back, in thermodynamic, float and inverted-bucket types
4. D.PSA or membrane units giving 95–99.5% purity for blanketing and purging, against cryogenic ASU for high purity; tank blanketing holds a slight positive pressure

Answer + AI explanation with Pro

1. A.Instrument air quality
2. B.Cycles of concentration
3. C.DM water
4. D.Cooling tower approach and range

Answer + AI explanation with Pro

1. A.Cooling tower approach and range — dry oil-free air at about 7 bar with dew point at least 10 °C below the lowest ambient per ISA 7.0.01, backed by a receiver for 15–20 minutes of autonomy
2. B.Cooling tower approach and range — approach is outlet water temperature minus ambient wet-bulb (typically 4–5 °C); range is inlet minus outlet water temperature
3. C.Cooling tower approach and range — ratio of dissolved solids in circulating to make-up cooling water, controlled by blowdown; typically 4–6 with silica held below about 150 ppm
4. D.Cooling tower approach and range — PSA or membrane units giving 95–99.5% purity for blanketing and purging, against cryogenic ASU for high purity; tank blanketing holds a slight positive pressure

Answer + AI explanation with Pro

1. A.demineralised water from cation-anion exchange or RO plus mixed bed, with conductivity below about 1 μS/cm for high-pressure boiler feed
2. B.PSA or membrane units giving 95–99.5% purity for blanketing and purging, against cryogenic ASU for high purity; tank blanketing holds a slight positive pressure
3. C.approach is outlet water temperature minus ambient wet-bulb (typically 4–5 °C); range is inlet minus outlet water temperature
4. D.Indian Boiler Regulations under the Boilers Act 1923 governing design, fabrication, inspection and annual certification of boilers above 22.75 litres and their steam piping

Answer + AI explanation with Pro

1. A.Flare system
2. B.Steam trap
3. C.Instrument air quality
4. D.DM water

Answer + AI explanation with Pro

1. A.DM water — Indian Boiler Regulations under the Boilers Act 1923 governing design, fabrication, inspection and annual certification of boilers above 22.75 litres and their steam piping
2. B.DM water — knock-out drum, liquid seal, purge gas and pilots ensuring safe combustion of relief gas, with radiation limited to about 4.7 kW/m² at the sterile-area boundary
3. C.DM water — demineralised water from cation-anion exchange or RO plus mixed bed, with conductivity below about 1 μS/cm for high-pressure boiler feed
4. D.DM water — ratio of dissolved solids in circulating to make-up cooling water, controlled by blowdown; typically 4–6 with silica held below about 150 ppm

Answer + AI explanation with Pro

1. A.PSA or membrane units giving 95–99.5% purity for blanketing and purging, against cryogenic ASU for high purity; tank blanketing holds a slight positive pressure
2. B.automatic valve that discharges condensate and air while holding steam back, in thermodynamic, float and inverted-bucket types
3. C.knock-out drum, liquid seal, purge gas and pilots ensuring safe combustion of relief gas, with radiation limited to about 4.7 kW/m² at the sterile-area boundary
4. D.ratio of dissolved solids in circulating to make-up cooling water, controlled by blowdown; typically 4–6 with silica held below about 150 ppm

Answer + AI explanation with Pro

1. A.DM water
2. B.Nitrogen generation
3. C.Boiler blowdown
4. D.Steam trap

Answer + AI explanation with Pro

1. A.Steam trap — approach is outlet water temperature minus ambient wet-bulb (typically 4–5 °C); range is inlet minus outlet water temperature
2. B.Steam trap — dry oil-free air at about 7 bar with dew point at least 10 °C below the lowest ambient per ISA 7.0.01, backed by a receiver for 15–20 minutes of autonomy
3. C.Steam trap — automatic valve that discharges condensate and air while holding steam back, in thermodynamic, float and inverted-bucket types
4. D.Steam trap — enclosure holding at least the largest tank's full capacity (110% for the largest tank under OISD-118), with floating roofs for volatile products and inter-tank spacing

Answer + AI explanation with Pro

1. A.Indian Boiler Regulations under the Boilers Act 1923 governing design, fabrication, inspection and annual certification of boilers above 22.75 litres and their steam piping
2. B.dry oil-free air at about 7 bar with dew point at least 10 °C below the lowest ambient per ISA 7.0.01, backed by a receiver for 15–20 minutes of autonomy
3. C.ratio of dissolved solids in circulating to make-up cooling water, controlled by blowdown; typically 4–6 with silica held below about 150 ppm
4. D.enclosure holding at least the largest tank's full capacity (110% for the largest tank under OISD-118), with floating roofs for volatile products and inter-tank spacing

Answer + AI explanation with Pro

1. A.Cooling tower approach and range
2. B.Cycles of concentration
3. C.Tank farm dyke design
4. D.Steam trap

Answer + AI explanation with Pro

1. A.Cycles of concentration — ratio of dissolved solids in circulating to make-up cooling water, controlled by blowdown; typically 4–6 with silica held below about 150 ppm
2. B.Cycles of concentration — enclosure holding at least the largest tank's full capacity (110% for the largest tank under OISD-118), with floating roofs for volatile products and inter-tank spacing
3. C.Cycles of concentration — continuous and intermittent removal of concentrated water to hold TDS below about 3500 ppm in water-tube boilers, with heat recovered in a flash vessel
4. D.Cycles of concentration — knock-out drum, liquid seal, purge gas and pilots ensuring safe combustion of relief gas, with radiation limited to about 4.7 kW/m² at the sterile-area boundary

Answer + AI explanation with Pro

1. A.PSA or membrane units giving 95–99.5% purity for blanketing and purging, against cryogenic ASU for high purity; tank blanketing holds a slight positive pressure
2. B.dry oil-free air at about 7 bar with dew point at least 10 °C below the lowest ambient per ISA 7.0.01, backed by a receiver for 15–20 minutes of autonomy
3. C.knock-out drum, liquid seal, purge gas and pilots ensuring safe combustion of relief gas, with radiation limited to about 4.7 kW/m² at the sterile-area boundary
4. D.enclosure holding at least the largest tank's full capacity (110% for the largest tank under OISD-118), with floating roofs for volatile products and inter-tank spacing

Answer + AI explanation with Pro

1. A.Boiler blowdown
2. B.Instrument air quality
3. C.Cooling tower approach and range
4. D.Flare system

Answer + AI explanation with Pro

1. A.Instrument air quality — ratio of dissolved solids in circulating to make-up cooling water, controlled by blowdown; typically 4–6 with silica held below about 150 ppm
2. B.Instrument air quality — demineralised water from cation-anion exchange or RO plus mixed bed, with conductivity below about 1 μS/cm for high-pressure boiler feed
3. C.Instrument air quality — knock-out drum, liquid seal, purge gas and pilots ensuring safe combustion of relief gas, with radiation limited to about 4.7 kW/m² at the sterile-area boundary
4. D.Instrument air quality — dry oil-free air at about 7 bar with dew point at least 10 °C below the lowest ambient per ISA 7.0.01, backed by a receiver for 15–20 minutes of autonomy

Answer + AI explanation with Pro

1. A.Indian Boiler Regulations under the Boilers Act 1923 governing design, fabrication, inspection and annual certification of boilers above 22.75 litres and their steam piping
2. B.automatic valve that discharges condensate and air while holding steam back, in thermodynamic, float and inverted-bucket types
3. C.knock-out drum, liquid seal, purge gas and pilots ensuring safe combustion of relief gas, with radiation limited to about 4.7 kW/m² at the sterile-area boundary
4. D.approach is outlet water temperature minus ambient wet-bulb (typically 4–5 °C); range is inlet minus outlet water temperature

Answer + AI explanation with Pro

1. A.Flare system
2. B.IBR 1950
3. C.Cycles of concentration
4. D.Tank farm dyke design

Answer + AI explanation with Pro

1. A.Flare system — demineralised water from cation-anion exchange or RO plus mixed bed, with conductivity below about 1 μS/cm for high-pressure boiler feed
2. B.Flare system — knock-out drum, liquid seal, purge gas and pilots ensuring safe combustion of relief gas, with radiation limited to about 4.7 kW/m² at the sterile-area boundary
3. C.Flare system — dry oil-free air at about 7 bar with dew point at least 10 °C below the lowest ambient per ISA 7.0.01, backed by a receiver for 15–20 minutes of autonomy
4. D.Flare system — continuous and intermittent removal of concentrated water to hold TDS below about 3500 ppm in water-tube boilers, with heat recovered in a flash vessel

Answer + AI explanation with Pro

1. A.PSA or membrane units giving 95–99.5% purity for blanketing and purging, against cryogenic ASU for high purity; tank blanketing holds a slight positive pressure
2. B.approach is outlet water temperature minus ambient wet-bulb (typically 4–5 °C); range is inlet minus outlet water temperature
3. C.demineralised water from cation-anion exchange or RO plus mixed bed, with conductivity below about 1 μS/cm for high-pressure boiler feed
4. D.ratio of dissolved solids in circulating to make-up cooling water, controlled by blowdown; typically 4–6 with silica held below about 150 ppm

Answer + AI explanation with Pro

1. A.Cycles of concentration
2. B.DM water
3. C.Cooling tower approach and range
4. D.Nitrogen generation

Answer + AI explanation with Pro

1. A.Nitrogen generation — PSA or membrane units giving 95–99.5% purity for blanketing and purging, against cryogenic ASU for high purity; tank blanketing holds a slight positive pressure
2. B.Nitrogen generation — dry oil-free air at about 7 bar with dew point at least 10 °C below the lowest ambient per ISA 7.0.01, backed by a receiver for 15–20 minutes of autonomy
3. C.Nitrogen generation — demineralised water from cation-anion exchange or RO plus mixed bed, with conductivity below about 1 μS/cm for high-pressure boiler feed
4. D.Nitrogen generation — knock-out drum, liquid seal, purge gas and pilots ensuring safe combustion of relief gas, with radiation limited to about 4.7 kW/m² at the sterile-area boundary

Answer + AI explanation with Pro

1. A.ratio of dissolved solids in circulating to make-up cooling water, controlled by blowdown; typically 4–6 with silica held below about 150 ppm
2. B.Indian Boiler Regulations under the Boilers Act 1923 governing design, fabrication, inspection and annual certification of boilers above 22.75 litres and their steam piping
3. C.continuous and intermittent removal of concentrated water to hold TDS below about 3500 ppm in water-tube boilers, with heat recovered in a flash vessel
4. D.demineralised water from cation-anion exchange or RO plus mixed bed, with conductivity below about 1 μS/cm for high-pressure boiler feed

Answer + AI explanation with Pro

1. A.Steam trap
2. B.Boiler blowdown
3. C.Cooling tower approach and range
4. D.DM water

Answer + AI explanation with Pro

1. A.Boiler blowdown — demineralised water from cation-anion exchange or RO plus mixed bed, with conductivity below about 1 μS/cm for high-pressure boiler feed
2. B.Boiler blowdown — knock-out drum, liquid seal, purge gas and pilots ensuring safe combustion of relief gas, with radiation limited to about 4.7 kW/m² at the sterile-area boundary
3. C.Boiler blowdown — Indian Boiler Regulations under the Boilers Act 1923 governing design, fabrication, inspection and annual certification of boilers above 22.75 litres and their steam piping
4. D.Boiler blowdown — continuous and intermittent removal of concentrated water to hold TDS below about 3500 ppm in water-tube boilers, with heat recovered in a flash vessel

Answer + AI explanation with Pro

1. A.enclosure holding at least the largest tank's full capacity (110% for the largest tank under OISD-118), with floating roofs for volatile products and inter-tank spacing
2. B.knock-out drum, liquid seal, purge gas and pilots ensuring safe combustion of relief gas, with radiation limited to about 4.7 kW/m² at the sterile-area boundary
3. C.automatic valve that discharges condensate and air while holding steam back, in thermodynamic, float and inverted-bucket types
4. D.ratio of dissolved solids in circulating to make-up cooling water, controlled by blowdown; typically 4–6 with silica held below about 150 ppm

Answer + AI explanation with Pro

1. A.Steam trap
2. B.IBR 1950
3. C.Tank farm dyke design
4. D.Cooling tower approach and range

Answer + AI explanation with Pro

1. A.Tank farm dyke design — demineralised water from cation-anion exchange or RO plus mixed bed, with conductivity below about 1 μS/cm for high-pressure boiler feed
2. B.Tank farm dyke design — Indian Boiler Regulations under the Boilers Act 1923 governing design, fabrication, inspection and annual certification of boilers above 22.75 litres and their steam piping
3. C.Tank farm dyke design — enclosure holding at least the largest tank's full capacity (110% for the largest tank under OISD-118), with floating roofs for volatile products and inter-tank spacing
4. D.Tank farm dyke design — continuous and intermittent removal of concentrated water to hold TDS below about 3500 ppm in water-tube boilers, with heat recovered in a flash vessel

Answer + AI explanation with Pro