Podcast
Questions and Answers
What is the main characteristic of direct-fired heaters?
What is the main characteristic of direct-fired heaters?
- The tubes carrying the process fluid are located outside the heater.
- They have burners inside the heater. (correct)
- They have an external heater to heat fluid.
- They are used only in chemical reactions.
In a fractionator reboiler, what is the function of the direct-fired heater?
In a fractionator reboiler, what is the function of the direct-fired heater?
- Heat the fluid drawn off the top of the fractionator tower.
- Heat fluid drawn off the bottom of the fractionator tower. (correct)
- Cool the fluid drawn off the bottom of the fractionator tower.
- Heat the fluid circulating at the top of the fractionator tower.
For what purpose are direct-fired heaters used in preheating the feed to a fractionator tower?
For what purpose are direct-fired heaters used in preheating the feed to a fractionator tower?
- To cool down the makeup to the tower.
- To maintain the temperature of the tower.
- To heat the feed to the fractionator tower. (correct)
- To increase the tower's pressure.
In what instances are start-up heaters used for preheating the process feed to a reactor?
In what instances are start-up heaters used for preheating the process feed to a reactor?
What role does the fired heater play in chemical reactions?
What role does the fired heater play in chemical reactions?
Which arrangement is shown in Figure 1 provided in the text?
Which arrangement is shown in Figure 1 provided in the text?
What is the primary function of a radiant heater?
What is the primary function of a radiant heater?
What is a common design feature of convection heaters?
What is a common design feature of convection heaters?
In a combination radiant and convection heater, where is the radiant section typically located?
In a combination radiant and convection heater, where is the radiant section typically located?
What is the main defining characteristic of a vertical, rectangular cabin heater?
What is the main defining characteristic of a vertical, rectangular cabin heater?
What is the primary purpose of fired heaters in heating viscous fluids?
What is the primary purpose of fired heaters in heating viscous fluids?
What type of fired heater has the lowest efficiency at 40-50%?
What type of fired heater has the lowest efficiency at 40-50%?
Which section of a combination heater contains the burners and the radiant portion?
Which section of a combination heater contains the burners and the radiant portion?
What distinguishes a box heater from other fired heater designs?
What distinguishes a box heater from other fired heater designs?
What heat transfer mechanism is primarily used in convection heaters?
What heat transfer mechanism is primarily used in convection heaters?
In a radiant heater, how is heat transferred to the tubes after radiation through the furnace space?
In a radiant heater, how is heat transferred to the tubes after radiation through the furnace space?
What is the main function of a direct-fired heater in preheating the process feed to a reactor?
What is the main function of a direct-fired heater in preheating the process feed to a reactor?
What is the purpose of start-up heaters in the context of chemical reactions?
What is the purpose of start-up heaters in the context of chemical reactions?
In what scenario would a direct-fired heater be considered unnecessary in a chemical plant?
In what scenario would a direct-fired heater be considered unnecessary in a chemical plant?
Which of the following best describes the primary role of a fired heater in a fractionator tower?
Which of the following best describes the primary role of a fired heater in a fractionator tower?
What is a common challenge associated with using direct-fired heaters for chemical reactions?
What is a common challenge associated with using direct-fired heaters for chemical reactions?
Why might a direct-fired heater be shut down after a chemical reaction in some scenarios?
Why might a direct-fired heater be shut down after a chemical reaction in some scenarios?
What is the main difference between a radiant heater and a convection heater?
What is the main difference between a radiant heater and a convection heater?
What makes combination radiant and convection heaters more common than radiant or convection heaters alone?
What makes combination radiant and convection heaters more common than radiant or convection heaters alone?
How are combustion gases utilized in convection heaters to transfer heat to tubes?
How are combustion gases utilized in convection heaters to transfer heat to tubes?
What design feature makes the vertical, cylindrical heater the most common fired heater design?
What design feature makes the vertical, cylindrical heater the most common fired heater design?
Why do some fluids need to be heated by fired heaters before processing?
Why do some fluids need to be heated by fired heaters before processing?
What is the main heat transfer mechanism used in radiant heaters?
What is the main heat transfer mechanism used in radiant heaters?
What distinguishes a cabin heater from other fired heater designs?
What distinguishes a cabin heater from other fired heater designs?
Why are box heaters so named in the context of fired heaters?
Why are box heaters so named in the context of fired heaters?
What is a common feature of convection heaters that aids in heat transfer efficiency?
What is a common feature of convection heaters that aids in heat transfer efficiency?
Why are convection heaters generally more efficient than radiant heaters?
Why are convection heaters generally more efficient than radiant heaters?
What is the primary purpose of the refractory brick and other insulating materials used in the heater?
What is the primary purpose of the refractory brick and other insulating materials used in the heater?
Where are the vertical gas burners mounted in a typical vertical heater?
Where are the vertical gas burners mounted in a typical vertical heater?
What is the heat transfer mechanism in the convection section of the typical vertical heater?
What is the heat transfer mechanism in the convection section of the typical vertical heater?
What is the main method by which combustion air is received in a typical vertical heater?
What is the main method by which combustion air is received in a typical vertical heater?
Where does the heated process fluid go after leaving the lowest tubes on each wall of the vertical heater?
Where does the heated process fluid go after leaving the lowest tubes on each wall of the vertical heater?
In a typical vertical, cylindrical fired heater, what type of section is the radiant section and the convection section respectively?
In a typical vertical, cylindrical fired heater, what type of section is the radiant section and the convection section respectively?
What is the primary mechanism by which combustion air is received in a typical vertical heater?
What is the primary mechanism by which combustion air is received in a typical vertical heater?
Which component of the vertical heater is typically located along the walls of the furnace?
Which component of the vertical heater is typically located along the walls of the furnace?
What is the direction of flow of the process fluid through the tubes in the vertical heater?
What is the direction of flow of the process fluid through the tubes in the vertical heater?
What is the purpose of the refractory brick and insulating material in the vertical heater?
What is the purpose of the refractory brick and insulating material in the vertical heater?
What is the typical configuration of the burners in a vertical heater?
What is the typical configuration of the burners in a vertical heater?
What is the typical orientation of the tubes in the radiant section of a vertical, cylindrical fired heater?
What is the typical orientation of the tubes in the radiant section of a vertical, cylindrical fired heater?
What type of burners are most common in vertical fired heaters?
What type of burners are most common in vertical fired heaters?
Where does the secondary air flow in a common gas burner for a vertically fired heater?
Where does the secondary air flow in a common gas burner for a vertically fired heater?
What is the purpose of the refractory in a fired heater?
What is the purpose of the refractory in a fired heater?
What is the design feature of a bottom fired vertical heater regarding gas and air mixture?
What is the design feature of a bottom fired vertical heater regarding gas and air mixture?
What is the role of adjustable air registers around the burner?
What is the role of adjustable air registers around the burner?
How is the gas supplied in a natural gas burner design for a vertical heater?
How is the gas supplied in a natural gas burner design for a vertical heater?
What is the role of the air register in a natural gas burner?
What is the role of the air register in a natural gas burner?
What happens if a flame scanner fails to see a flame for four seconds?
What happens if a flame scanner fails to see a flame for four seconds?
What is the purpose of the flame scanner in a burner management system?
What is the purpose of the flame scanner in a burner management system?
What does the pressure gauge in a natural gas burner indicate?
What does the pressure gauge in a natural gas burner indicate?
What is the purpose of the pilot in a natural gas burner?
What is the purpose of the pilot in a natural gas burner?
What are the flame scanners responding to in each burner?
What are the flame scanners responding to in each burner?
What is the purpose of the pilot in a natural gas burner?
What is the purpose of the pilot in a natural gas burner?
What is the response of the burner management system if the scanner fails to see a flame for four seconds?
What is the response of the burner management system if the scanner fails to see a flame for four seconds?
What does the pressure gauge in a natural gas burner indicate?
What does the pressure gauge in a natural gas burner indicate?
What is the primary function of a flame scanner in a burner management system?
What is the primary function of a flame scanner in a burner management system?
What is the purpose of the air register in a natural gas burner?
What is the purpose of the air register in a natural gas burner?
What is the response of the flame scanner if it fails to see a stable flame?
What is the response of the flame scanner if it fails to see a stable flame?
What is the purpose of the adjustable air registers located around the perimeter of the burner?
What is the purpose of the adjustable air registers located around the perimeter of the burner?
What is unique about the design of the natural gas burner shown in Figure 12?
What is unique about the design of the natural gas burner shown in Figure 12?
What is the primary function of the refractory on the furnace floor?
What is the primary function of the refractory on the furnace floor?
What is the typical configuration of the burners in a vertical heater?
What is the typical configuration of the burners in a vertical heater?
What is the purpose of the pilot in a natural gas burner?
What is the purpose of the pilot in a natural gas burner?
What is a common feature of fired heaters that burn fuels that are a product or by-product of the process plant?
What is a common feature of fired heaters that burn fuels that are a product or by-product of the process plant?
What component of the fuel gas supply system protects the section from high pressure in case the upstream regulator fails?
What component of the fuel gas supply system protects the section from high pressure in case the upstream regulator fails?
In the fuel gas supply system, which equipment reduces the supply pressure and ensures a constant gas pressure to the main fuel control valves?
In the fuel gas supply system, which equipment reduces the supply pressure and ensures a constant gas pressure to the main fuel control valves?
What is the purpose of the main fuel and bypass fuel control valves in the fuel gas supply system?
What is the purpose of the main fuel and bypass fuel control valves in the fuel gas supply system?
Why are high-pressure and low-pressure switches included in the fuel gas supply system?
Why are high-pressure and low-pressure switches included in the fuel gas supply system?
In the fuel gas supply system, which equipment allows monitoring of the pressure upstream of the main fuel control valve?
In the fuel gas supply system, which equipment allows monitoring of the pressure upstream of the main fuel control valve?
Which component in the fuel gas supply system regulates the fuel pressure to the burners and controls the firing rate of the heater?
Which component in the fuel gas supply system regulates the fuel pressure to the burners and controls the firing rate of the heater?
What safety feature in the fuel gas supply system protects the section from high pressure in case the upstream regulator fails?
What safety feature in the fuel gas supply system protects the section from high pressure in case the upstream regulator fails?
What component regulates the fuel pressure to the burners and controls the firing rate of the heater in the fuel gas supply system?
What component regulates the fuel pressure to the burners and controls the firing rate of the heater in the fuel gas supply system?
Where does the gas flow after passing through the strainer in the fuel gas supply system?
Where does the gas flow after passing through the strainer in the fuel gas supply system?
What action do the high-pressure and low-pressure switches take in the fuel gas supply system if pressure limits are exceeded?
What action do the high-pressure and low-pressure switches take in the fuel gas supply system if pressure limits are exceeded?
Which component in the fuel gas supply system allows for manual venting of the gas supply?
Which component in the fuel gas supply system allows for manual venting of the gas supply?
What is the purpose of the main fuel and bypass fuel control valves in the fuel gas supply system?
What is the purpose of the main fuel and bypass fuel control valves in the fuel gas supply system?
Why should the draft sampling system be airtight?
Why should the draft sampling system be airtight?
What is the purpose of excess air in fired heaters?
What is the purpose of excess air in fired heaters?
How can the level of excess air in a heater be determined accurately?
How can the level of excess air in a heater be determined accurately?
What is the purpose of a flame failure shutdown device in fired heaters?
What is the purpose of a flame failure shutdown device in fired heaters?
Why are fired heaters fitted with an emergency shutdown switch?
Why are fired heaters fitted with an emergency shutdown switch?
How can the excess air in a fired heater be adjusted to ensure optimal combustion?
How can the excess air in a fired heater be adjusted to ensure optimal combustion?
What results from insufficient excess air in a fired heater?
What results from insufficient excess air in a fired heater?
How is the correct amount of excess air typically set in fired heaters with forced draft?
How is the correct amount of excess air typically set in fired heaters with forced draft?
Why are shutdown devices crucial in fired heaters?
Why are shutdown devices crucial in fired heaters?
What do flame scanners in fired heaters primarily detect?
What do flame scanners in fired heaters primarily detect?
What is the purpose of draft in natural draft heaters?
What is the purpose of draft in natural draft heaters?
Which locations in the heater generally have thermocouples permanently mounted for monitoring?
Which locations in the heater generally have thermocouples permanently mounted for monitoring?
What is the purpose of draft in natural draft heaters?
What is the purpose of draft in natural draft heaters?
Where are thermocouples typically mounted in a multiple pass heater?
Where are thermocouples typically mounted in a multiple pass heater?
Which section of the furnace might have thermocouples attached to monitor metal temperatures?
Which section of the furnace might have thermocouples attached to monitor metal temperatures?
How is draft measurement typically done in heaters?
How is draft measurement typically done in heaters?
In what units is draft usually measured in natural draft heaters?
In what units is draft usually measured in natural draft heaters?
Why are thermocouples permanently mounted in critical locations in heaters?
Why are thermocouples permanently mounted in critical locations in heaters?
Why must the draft sampling system be airtight?
Why must the draft sampling system be airtight?
What is the purpose of excess air in fired heaters?
What is the purpose of excess air in fired heaters?
Why do most fired heaters lack sophisticated controls for excess air or draft?
Why do most fired heaters lack sophisticated controls for excess air or draft?
What indicates too much excess air in a fired heater when observing the burner flames?
What indicates too much excess air in a fired heater when observing the burner flames?
Which device in a fired heater system is designed to shut off the fuel supply to burners if a stable flame is not seen?
Which device in a fired heater system is designed to shut off the fuel supply to burners if a stable flame is not seen?
What is the primary role of the emergency shutdown switch in a fired heater?
What is the primary role of the emergency shutdown switch in a fired heater?
Why are pre-alarms installed in fired heaters as part of the safety devices?
Why are pre-alarms installed in fired heaters as part of the safety devices?
What problem can occur if the process flow and burners are not immediately stopped after a tube failure in a fired heater?
What problem can occur if the process flow and burners are not immediately stopped after a tube failure in a fired heater?
What is the function of the high stack temperature trip in a fired heater system?
What is the function of the high stack temperature trip in a fired heater system?
Which component ensures that the process liquid in fired heaters is not sprayed into the furnace in case of tube overheating?
Which component ensures that the process liquid in fired heaters is not sprayed into the furnace in case of tube overheating?
What happens if the flame scanners fail to detect flame at the pilot burners within 10 seconds of the gas valves opening?
What happens if the flame scanners fail to detect flame at the pilot burners within 10 seconds of the gas valves opening?
What occurs if the main flame is not verified by the flame scanner within a certain time?
What occurs if the main flame is not verified by the flame scanner within a certain time?
When is the burner management system allowed to switch control of the heater to automatic?
When is the burner management system allowed to switch control of the heater to automatic?
What should be done when the burner pressure approaches the low-level trip setting?
What should be done when the burner pressure approaches the low-level trip setting?
What should be done when only one burner remains and the burner pressure is low?
What should be done when only one burner remains and the burner pressure is low?
Why should the fuel supply system shutoff valve be closed after all burners are off?
Why should the fuel supply system shutoff valve be closed after all burners are off?
What is the purpose of permissives in a burner management system?
What is the purpose of permissives in a burner management system?
How is the completion of the purge in a heater determined in a burner management system?
How is the completion of the purge in a heater determined in a burner management system?
What is the primary reason for prompt pilot ignition in a heater?
What is the primary reason for prompt pilot ignition in a heater?
Why is the control transferred to the automatic control system only when safe to do so in a burner management system?
Why is the control transferred to the automatic control system only when safe to do so in a burner management system?
What is the role of pilot ignition in a burner management system?
What is the role of pilot ignition in a burner management system?
In the context of a burner management system, what are permissives?
In the context of a burner management system, what are permissives?
If the pilot flame is not detected by the scanner, what happens next in the burner management system?
If the pilot flame is not detected by the scanner, what happens next in the burner management system?
What occurs if the burner pressure approaches the low-level trip setting in the heater control process?
What occurs if the burner pressure approaches the low-level trip setting in the heater control process?
What action will the burner management system take when all burners are shut off and the fuel supply system shutoff valve is closed?
What action will the burner management system take when all burners are shut off and the fuel supply system shutoff valve is closed?
When process conditions permit, what can be done with the last remaining burner in the heater?
When process conditions permit, what can be done with the last remaining burner in the heater?
What is the significance of the burner pressure in relation to the functioning of the heater?
What is the significance of the burner pressure in relation to the functioning of the heater?
How is the operation switched from manual to automatic in the burner management system?
How is the operation switched from manual to automatic in the burner management system?
What must be done before the purge can be started in a burner management system?
What must be done before the purge can be started in a burner management system?
When is the burner management system allowed to transfer control to the automatic control system?
When is the burner management system allowed to transfer control to the automatic control system?
What determines the completion of the purge in a burner management system?
What determines the completion of the purge in a burner management system?
Why must pilot ignition be prompt in a burner management system?
Why must pilot ignition be prompt in a burner management system?
What initiates the purging of a heater in a burner management system?
What initiates the purging of a heater in a burner management system?
In the sequence illustrated in Figure 19, what follows the initiation of purging?
In the sequence illustrated in Figure 19, what follows the initiation of purging?
What is the primary heat transfer process in an indirect fired heater?
What is the primary heat transfer process in an indirect fired heater?
Which component of an indirect fired heater helps in creating the required natural draft?
Which component of an indirect fired heater helps in creating the required natural draft?
What is the purpose of the heat transfer media used in an indirect fired heater?
What is the purpose of the heat transfer media used in an indirect fired heater?
Where is the burner typically connected in an indirect fired heater?
Where is the burner typically connected in an indirect fired heater?
Which fluid is NOT a common heat transfer media used in indirect fired heaters?
Which fluid is NOT a common heat transfer media used in indirect fired heaters?
What is the purpose of the expansion tank in an indirect fired heater?
What is the purpose of the expansion tank in an indirect fired heater?
What is the purpose of glycol in water bath heaters in colder climates?
What is the purpose of glycol in water bath heaters in colder climates?
Where is the process coil located in a steam bath heater?
Where is the process coil located in a steam bath heater?
What type of heat transfer oil is commonly used in oil bath heaters?
What type of heat transfer oil is commonly used in oil bath heaters?
What is the advantage of using salt baths over oil baths in heaters?
What is the advantage of using salt baths over oil baths in heaters?
What component in the salt bath mixtures helps protect coils from corrosion and pitting?
What component in the salt bath mixtures helps protect coils from corrosion and pitting?
What process fluid outlet temperature range is achievable with oil bath heaters?
What process fluid outlet temperature range is achievable with oil bath heaters?
What is the primary advantage of using salt baths over oil baths in heaters?
What is the primary advantage of using salt baths over oil baths in heaters?
What is the purpose of glycol in water bath heaters in colder climates?
What is the purpose of glycol in water bath heaters in colder climates?
What is the maximum process outlet temperature that can be achieved using steam bath heaters?
What is the maximum process outlet temperature that can be achieved using steam bath heaters?
What is the typical composition of the salt mixture used in salt bath heaters?
What is the typical composition of the salt mixture used in salt bath heaters?
What is the primary advantage of using oil bath heaters over water bath heaters?
What is the primary advantage of using oil bath heaters over water bath heaters?
What is the maximum steam pressure that can be safely handled by steam bath heaters?
What is the maximum steam pressure that can be safely handled by steam bath heaters?
In indirect fired heaters, what is the immediate source of heat for the process fluid in the heating tubes?
In indirect fired heaters, what is the immediate source of heat for the process fluid in the heating tubes?
What role do the smooth bends of the firetube play in indirect fired heaters?
What role do the smooth bends of the firetube play in indirect fired heaters?
In indirect fired heaters, where is the operating liquid level usually maintained?
In indirect fired heaters, where is the operating liquid level usually maintained?
What is the purpose of the expansion tank in indirect fired heaters?
What is the purpose of the expansion tank in indirect fired heaters?
Which media are commonly used for different temperature applications in indirect fired heaters?
Which media are commonly used for different temperature applications in indirect fired heaters?
How do indirect fired heaters transfer heat to the process fluid heating tubes?
How do indirect fired heaters transfer heat to the process fluid heating tubes?
What indicates insufficient air in a burner flame?
What indicates insufficient air in a burner flame?
How is the temperature of the fluid passing through the coil regulated?
How is the temperature of the fluid passing through the coil regulated?
What happens when the main burner reaches the desired heat transfer fluid temperature?
What happens when the main burner reaches the desired heat transfer fluid temperature?
How is the heater shut down?
How is the heater shut down?
What should be observed during normal heater operation?
What should be observed during normal heater operation?
What happens to the residual gas in the burner manifold during shutdown?
What happens to the residual gas in the burner manifold during shutdown?
What is the typical temperature set point for a glycol heater?
What is the typical temperature set point for a glycol heater?
What is the purpose of preheating the fuel in an indirect fired heater?
What is the purpose of preheating the fuel in an indirect fired heater?
What is the role of the thermostat in an indirect fired heater?
What is the role of the thermostat in an indirect fired heater?
What is the primary fuel used in indirect fired heaters?
What is the primary fuel used in indirect fired heaters?
What is the correct sequence of steps to start up an indirect fired heater?
What is the correct sequence of steps to start up an indirect fired heater?
What is the purpose of checking the condition of all heater components before start-up?
What is the purpose of checking the condition of all heater components before start-up?
How should the burner flame be adjusted for optimal operation?
How should the burner flame be adjusted for optimal operation?
What should be done if a yellow flame is observed on the burner?
What should be done if a yellow flame is observed on the burner?
How is the fluid temperature regulated within the heating coil?
How is the fluid temperature regulated within the heating coil?
What indicates that the main burner has reached the desired heat transfer fluid temperature?
What indicates that the main burner has reached the desired heat transfer fluid temperature?
How can the heater be safely shut down?
How can the heater be safely shut down?
What should be monitored when the process outlet temperature is checked often?
What should be monitored when the process outlet temperature is checked often?
What is the purpose of the pilot in an indirect fired heater?
What is the purpose of the pilot in an indirect fired heater?
What is the recommended operating temperature range for a glycol heater?
What is the recommended operating temperature range for a glycol heater?
What should be ensured before starting the heater in terms of components?
What should be ensured before starting the heater in terms of components?
What regulates the gas pressure at the main burner for an indirect fired heater?
What regulates the gas pressure at the main burner for an indirect fired heater?
What is the main criterion for switching the main burner on/off in an indirect fired heater?
What is the main criterion for switching the main burner on/off in an indirect fired heater?
Which component is responsible for igniting the pilot in an indirect fired heater?
Which component is responsible for igniting the pilot in an indirect fired heater?
