3B2 E2.5 C13 Review
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Questions and Answers

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?

  • 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?

  • 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?

    <p>To get the chemical reaction started.</p> Signup and view all the answers

    What role does the fired heater play in chemical reactions?

    <p>To promote a direct chemical reaction.</p> Signup and view all the answers

    Which arrangement is shown in Figure 1 provided in the text?

    <p>Fractionator Reboiler</p> Signup and view all the answers

    What is the primary function of a radiant heater?

    <p>Transfer heat by radiation to the tubes</p> Signup and view all the answers

    What is a common design feature of convection heaters?

    <p>Fins on the outer surface of the tubes</p> Signup and view all the answers

    In a combination radiant and convection heater, where is the radiant section typically located?

    <p>Below the burners and radiant section</p> Signup and view all the answers

    What is the main defining characteristic of a vertical, rectangular cabin heater?

    <p>Central row of radiant tubes dividing the furnace vertically</p> Signup and view all the answers

    What is the primary purpose of fired heaters in heating viscous fluids?

    <p>Lower the viscosity of the fluids</p> Signup and view all the answers

    What type of fired heater has the lowest efficiency at 40-50%?

    <p>Radiant heater</p> Signup and view all the answers

    Which section of a combination heater contains the burners and the radiant portion?

    <p>Radiant section</p> Signup and view all the answers

    What distinguishes a box heater from other fired heater designs?

    <p>Box-like shape in the radiant sections</p> Signup and view all the answers

    What heat transfer mechanism is primarily used in convection heaters?

    <p>Convection</p> Signup and view all the answers

    In a radiant heater, how is heat transferred to the tubes after radiation through the furnace space?

    <p>By conduction through the tube metal</p> Signup and view all the answers

    What is the main function of a direct-fired heater in preheating the process feed to a reactor?

    <p>To ensure the process fluid is hot enough for the chemical reaction to occur</p> Signup and view all the answers

    What is the purpose of start-up heaters in the context of chemical reactions?

    <p>To initiate the chemical reaction by providing the necessary initial heat</p> Signup and view all the answers

    In what scenario would a direct-fired heater be considered unnecessary in a chemical plant?

    <p>When the chemical reactions are exothermic and self-sustaining</p> Signup and view all the answers

    Which of the following best describes the primary role of a fired heater in a fractionator tower?

    <p>To heat fluid drawn off the bottom to re-enter the tower in a vapor state</p> Signup and view all the answers

    What is a common challenge associated with using direct-fired heaters for chemical reactions?

    <p>Inability to reach high enough temperatures for some reactions</p> Signup and view all the answers

    Why might a direct-fired heater be shut down after a chemical reaction in some scenarios?

    <p>To conserve energy and reduce operational costs</p> Signup and view all the answers

    What is the main difference between a radiant heater and a convection heater?

    <p>The heating surfaces in a radiant heater are in direct sight of the furnace while in a convection heater, combustion gases flow across the tubes.</p> Signup and view all the answers

    What makes combination radiant and convection heaters more common than radiant or convection heaters alone?

    <p>Radiant and convection heaters together provide a more balanced and efficient heat transfer process.</p> Signup and view all the answers

    How are combustion gases utilized in convection heaters to transfer heat to tubes?

    <p>By flowing across the tubes and carrying heat through convection.</p> Signup and view all the answers

    What design feature makes the vertical, cylindrical heater the most common fired heater design?

    <p>The efficient placement of burners firing upwards into the furnace.</p> Signup and view all the answers

    Why do some fluids need to be heated by fired heaters before processing?

    <p>To lower their viscosity for easier pumping and processing.</p> Signup and view all the answers

    What is the main heat transfer mechanism used in radiant heaters?

    <p>Radiation through the furnace space.</p> Signup and view all the answers

    What distinguishes a cabin heater from other fired heater designs?

    <p>The presence of a sloping transition section in the radiant zone.</p> Signup and view all the answers

    Why are box heaters so named in the context of fired heaters?

    <p>Because they contain a rectangular shape in the radiant sections.</p> Signup and view all the answers

    What is a common feature of convection heaters that aids in heat transfer efficiency?

    <p>The presence of fins on the outer surface of the tubes.</p> Signup and view all the answers

    Why are convection heaters generally more efficient than radiant heaters?

    <p>The presence of fins on the outer surface, improving heat transfer.</p> Signup and view all the answers

    What is the primary purpose of the refractory brick and other insulating materials used in the heater?

    <p>To keep heat inside the furnace and prevent overheating of the exterior</p> Signup and view all the answers

    Where are the vertical gas burners mounted in a typical vertical heater?

    <p>In the floor of the furnace</p> Signup and view all the answers

    What is the heat transfer mechanism in the convection section of the typical vertical heater?

    <p>Convection</p> Signup and view all the answers

    What is the main method by which combustion air is received in a typical vertical heater?

    <p>By natural draft due to the height of the stack</p> Signup and view all the answers

    Where does the heated process fluid go after leaving the lowest tubes on each wall of the vertical heater?

    <p>Directly to the process equipment in the plant</p> Signup and view all the answers

    In a typical vertical, cylindrical fired heater, what type of section is the radiant section and the convection section respectively?

    <p>Radiant section is cylindrical, convection section is rectangular</p> Signup and view all the answers

    What is the primary mechanism by which combustion air is received in a typical vertical heater?

    <p>Natural draft</p> Signup and view all the answers

    Which component of the vertical heater is typically located along the walls of the furnace?

    <p>Radiant section tubes</p> Signup and view all the answers

    What is the direction of flow of the process fluid through the tubes in the vertical heater?

    <p>Descending</p> Signup and view all the answers

    What is the purpose of the refractory brick and insulating material in the vertical heater?

    <p>To contain heat inside the furnace</p> Signup and view all the answers

    What is the typical configuration of the burners in a vertical heater?

    <p>Mounted on the floor</p> Signup and view all the answers

    What is the typical orientation of the tubes in the radiant section of a vertical, cylindrical fired heater?

    <p>Vertical</p> Signup and view all the answers

    What type of burners are most common in vertical fired heaters?

    <p>Natural draft burners</p> Signup and view all the answers

    Where does the secondary air flow in a common gas burner for a vertically fired heater?

    <p>Around the perimeter of the burner</p> Signup and view all the answers

    What is the purpose of the refractory in a fired heater?

    <p>To protect the burner from radiant heat</p> Signup and view all the answers

    What is the design feature of a bottom fired vertical heater regarding gas and air mixture?

    <p>Not premixed with air</p> Signup and view all the answers

    What is the role of adjustable air registers around the burner?

    <p>Control excess air limits</p> Signup and view all the answers

    How is the gas supplied in a natural gas burner design for a vertical heater?

    <p>Piped to burner tips/nozzles</p> Signup and view all the answers

    What is the role of the air register in a natural gas burner?

    <p>To control combustion air flow to the burner</p> Signup and view all the answers

    What happens if a flame scanner fails to see a flame for four seconds?

    <p>The burner management system shuts off the fuel to the burner</p> Signup and view all the answers

    What is the purpose of the flame scanner in a burner management system?

    <p>To ensure fuel to the burner is stopped if no stable flame is present</p> Signup and view all the answers

    What does the pressure gauge in a natural gas burner indicate?

    <p>The gas supply pressure to the burner</p> Signup and view all the answers

    What is the purpose of the pilot in a natural gas burner?

    <p>To ignite the main burner</p> Signup and view all the answers

    What are the flame scanners responding to in each burner?

    <p>The presence or absence of a flame</p> Signup and view all the answers

    What is the purpose of the pilot in a natural gas burner?

    <p>To ignite the main burner</p> Signup and view all the answers

    What is the response of the burner management system if the scanner fails to see a flame for four seconds?

    <p>It shuts off the fuel to the burner</p> Signup and view all the answers

    What does the pressure gauge in a natural gas burner indicate?

    <p>The gas supply pressure</p> Signup and view all the answers

    What is the primary function of a flame scanner in a burner management system?

    <p>To monitor the flame stability</p> Signup and view all the answers

    What is the purpose of the air register in a natural gas burner?

    <p>To admit air to the burner</p> Signup and view all the answers

    What is the response of the flame scanner if it fails to see a stable flame?

    <p>It shuts off the fuel to the burner</p> Signup and view all the answers

    What is the purpose of the adjustable air registers located around the perimeter of the burner?

    <p>To modify the flame pattern and maintain excess air within limits</p> Signup and view all the answers

    What is unique about the design of the natural gas burner shown in Figure 12?

    <p>The gas is injected into the combustion zone through nozzles</p> Signup and view all the answers

    What is the primary function of the refractory on the furnace floor?

    <p>To protect the burner parts from radiant heat</p> Signup and view all the answers

    What is the typical configuration of the burners in a vertical heater?

    <p>Multiple burners mounted on the walls</p> Signup and view all the answers

    What is the purpose of the pilot in a natural gas burner?

    <p>To ignite the main burner</p> Signup and view all the answers

    What is a common feature of fired heaters that burn fuels that are a product or by-product of the process plant?

    <p>They use natural draft burners</p> Signup and view all the answers

    What component of the fuel gas supply system protects the section from high pressure in case the upstream regulator fails?

    <p>High-pressure switch</p> Signup and view all the answers

    In the fuel gas supply system, which equipment reduces the supply pressure and ensures a constant gas pressure to the main fuel control valves?

    <p>Pressure regulator</p> Signup and view all the answers

    What is the purpose of the main fuel and bypass fuel control valves in the fuel gas supply system?

    <p>To control the gas flow at the burner</p> Signup and view all the answers

    Why are high-pressure and low-pressure switches included in the fuel gas supply system?

    <p>To trip the system offline based on pressure limits</p> Signup and view all the answers

    In the fuel gas supply system, which equipment allows monitoring of the pressure upstream of the main fuel control valve?

    <p>Pressure gauge</p> Signup and view all the answers

    Which component in the fuel gas supply system regulates the fuel pressure to the burners and controls the firing rate of the heater?

    <p>Main fuel and bypass fuel control valves</p> Signup and view all the answers

    What safety feature in the fuel gas supply system protects the section from high pressure in case the upstream regulator fails?

    <p>High-pressure switches</p> Signup and view all the answers

    What component regulates the fuel pressure to the burners and controls the firing rate of the heater in the fuel gas supply system?

    <p>Pressure regulator</p> Signup and view all the answers

    Where does the gas flow after passing through the strainer in the fuel gas supply system?

    <p>Into the main fuel control valve</p> Signup and view all the answers

    What action do the high-pressure and low-pressure switches take in the fuel gas supply system if pressure limits are exceeded?

    <p>Trip the system offline</p> Signup and view all the answers

    Which component in the fuel gas supply system allows for manual venting of the gas supply?

    <p>Vent valve</p> Signup and view all the answers

    What is the purpose of the main fuel and bypass fuel control valves in the fuel gas supply system?

    <p>To control the firing rate of the heater</p> Signup and view all the answers

    Why should the draft sampling system be airtight?

    <p>To ensure accurate pressure readings</p> Signup and view all the answers

    What is the purpose of excess air in fired heaters?

    <p>To ensure complete fuel combustion</p> Signup and view all the answers

    How can the level of excess air in a heater be determined accurately?

    <p>Use an online oxygen analyzer</p> Signup and view all the answers

    What is the purpose of a flame failure shutdown device in fired heaters?

    <p>To prevent fuel supply if no stable flame is detected</p> Signup and view all the answers

    Why are fired heaters fitted with an emergency shutdown switch?

    <p>To manually activate the shutdown in emergencies</p> Signup and view all the answers

    How can the excess air in a fired heater be adjusted to ensure optimal combustion?

    <p>Increase the air supply until the flame turns orange</p> Signup and view all the answers

    What results from insufficient excess air in a fired heater?

    <p>Long yellow or orange flames</p> Signup and view all the answers

    How is the correct amount of excess air typically set in fired heaters with forced draft?

    <p>Using an oxygen analyzer for flue gas</p> Signup and view all the answers

    Why are shutdown devices crucial in fired heaters?

    <p>To prevent potential accidents</p> Signup and view all the answers

    What do flame scanners in fired heaters primarily detect?

    <p>Presence of stable flame</p> Signup and view all the answers

    What is the purpose of draft in natural draft heaters?

    <p>To create a pressure difference between the inside and outside of the heater</p> Signup and view all the answers

    Which locations in the heater generally have thermocouples permanently mounted for monitoring?

    <p>In critical areas such as process fluid inlet and outlet, flue gas, and tubes in the hottest section</p> Signup and view all the answers

    What is the purpose of draft in natural draft heaters?

    <p>To create a lower pressure inside the heater than outside</p> Signup and view all the answers

    Where are thermocouples typically mounted in a multiple pass heater?

    <p>At each pass along with a common inlet thermocouple</p> Signup and view all the answers

    Which section of the furnace might have thermocouples attached to monitor metal temperatures?

    <p>Hottest section of the furnace</p> Signup and view all the answers

    How is draft measurement typically done in heaters?

    <p>With draft gauges, like inclined manometers</p> Signup and view all the answers

    In what units is draft usually measured in natural draft heaters?

    <p>In inches of mercury or millimeters of mercury</p> Signup and view all the answers

    Why are thermocouples permanently mounted in critical locations in heaters?

    <p>To monitor metal temperatures and heater performance</p> Signup and view all the answers

    Why must the draft sampling system be airtight?

    <p>To avoid leaks into the sampling lines which can cause false readings</p> Signup and view all the answers

    What is the purpose of excess air in fired heaters?

    <p>Ensuring complete combustion of the fuel</p> Signup and view all the answers

    Why do most fired heaters lack sophisticated controls for excess air or draft?

    <p>To simplify the operation of the heaters</p> Signup and view all the answers

    What indicates too much excess air in a fired heater when observing the burner flames?

    <p>Shorter than normal flames</p> Signup and view all the answers

    Which device in a fired heater system is designed to shut off the fuel supply to burners if a stable flame is not seen?

    <p>Flame scanners</p> Signup and view all the answers

    What is the primary role of the emergency shutdown switch in a fired heater?

    <p>To manually stop the heater in emergencies</p> Signup and view all the answers

    Why are pre-alarms installed in fired heaters as part of the safety devices?

    <p>To prevent actual trips by alerting the control room</p> Signup and view all the answers

    What problem can occur if the process flow and burners are not immediately stopped after a tube failure in a fired heater?

    <p>Potential destruction of the heater and danger to surrounding equipment</p> Signup and view all the answers

    What is the function of the high stack temperature trip in a fired heater system?

    <p>To prevent overheating of the process coils</p> Signup and view all the answers

    Which component ensures that the process liquid in fired heaters is not sprayed into the furnace in case of tube overheating?

    <p>Shutdown devices</p> Signup and view all the answers

    What happens if the flame scanners fail to detect flame at the pilot burners within 10 seconds of the gas valves opening?

    <p>The pilot gas will close</p> Signup and view all the answers

    What occurs if the main flame is not verified by the flame scanner within a certain time?

    <p>The burner gas valve will close</p> Signup and view all the answers

    When is the burner management system allowed to switch control of the heater to automatic?

    <p>When the main flame is verified by the scanner</p> Signup and view all the answers

    What should be done when the burner pressure approaches the low-level trip setting?

    <p>The fuel supply system shutoff valve can be closed</p> Signup and view all the answers

    What should be done when only one burner remains and the burner pressure is low?

    <p>The last burner should be shut off</p> Signup and view all the answers

    Why should the fuel supply system shutoff valve be closed after all burners are off?

    <p>To prevent fuel leaks</p> Signup and view all the answers

    What is the purpose of permissives in a burner management system?

    <p>To ensure safe conditions before proceeding with the sequence</p> Signup and view all the answers

    How is the completion of the purge in a heater determined in a burner management system?

    <p>By testing the stack gases for traces of combustibles</p> Signup and view all the answers

    What is the primary reason for prompt pilot ignition in a heater?

    <p>To prevent unburned fuel accumulation in the furnace</p> Signup and view all the answers

    Why is the control transferred to the automatic control system only when safe to do so in a burner management system?

    <p>To ensure a safe operating condition is met</p> Signup and view all the answers

    What is the role of pilot ignition in a burner management system?

    <p>To prevent unburned fuel accumulation in the furnace</p> Signup and view all the answers

    In the context of a burner management system, what are permissives?

    <p>Conditions that must be met before proceeding with the sequence</p> Signup and view all the answers

    If the pilot flame is not detected by the scanner, what happens next in the burner management system?

    <p>The burner gas valve will close and the sequence must be restarted.</p> Signup and view all the answers

    What occurs if the burner pressure approaches the low-level trip setting in the heater control process?

    <p>One burner is shut off to reduce the firing rate of the heater.</p> Signup and view all the answers

    What action will the burner management system take when all burners are shut off and the fuel supply system shutoff valve is closed?

    <p>Continuous flow is maintained through the tubes to keep all burners off.</p> Signup and view all the answers

    When process conditions permit, what can be done with the last remaining burner in the heater?

    <p>Keep it running on minimum firing.</p> Signup and view all the answers

    What is the significance of the burner pressure in relation to the functioning of the heater?

    <p>Affects the opening of the fuel valves to the main burner.</p> Signup and view all the answers

    How is the operation switched from manual to automatic in the burner management system?

    <p>Once all main burners are proven and stable.</p> Signup and view all the answers

    What must be done before the purge can be started in a burner management system?

    <p>The stack damper must be closed</p> Signup and view all the answers

    When is the burner management system allowed to transfer control to the automatic control system?

    <p>Once the burners are fully lit</p> Signup and view all the answers

    What determines the completion of the purge in a burner management system?

    <p>Time or testing of stack gases for combustibles</p> Signup and view all the answers

    Why must pilot ignition be prompt in a burner management system?

    <p>To prevent accumulation of unburned fuel gas</p> Signup and view all the answers

    What initiates the purging of a heater in a burner management system?

    <p>Permissives being unmet</p> Signup and view all the answers

    In the sequence illustrated in Figure 19, what follows the initiation of purging?

    <p>Pilot lighting</p> Signup and view all the answers

    What is the primary heat transfer process in an indirect fired heater?

    <p>Conduction from the heat transfer fluid to the process tubes</p> Signup and view all the answers

    Which component of an indirect fired heater helps in creating the required natural draft?

    <p>Firetube</p> Signup and view all the answers

    What is the purpose of the heat transfer media used in an indirect fired heater?

    <p>To transfer heat from the burner to the process tubes</p> Signup and view all the answers

    Where is the burner typically connected in an indirect fired heater?

    <p>To the inlet of the firetube</p> Signup and view all the answers

    Which fluid is NOT a common heat transfer media used in indirect fired heaters?

    <p>Methanol</p> Signup and view all the answers

    What is the purpose of the expansion tank in an indirect fired heater?

    <p>To accommodate the volume changes in the heat transfer media</p> Signup and view all the answers

    What is the purpose of glycol in water bath heaters in colder climates?

    <p>To reduce the freezing point of the media</p> Signup and view all the answers

    Where is the process coil located in a steam bath heater?

    <p>In the steam space above the water level</p> Signup and view all the answers

    What type of heat transfer oil is commonly used in oil bath heaters?

    <p>Special heat transfer oil</p> Signup and view all the answers

    What is the advantage of using salt baths over oil baths in heaters?

    <p>Salt baths have a higher melting point than oil</p> Signup and view all the answers

    What component in the salt bath mixtures helps protect coils from corrosion and pitting?

    <p>Potassium nitrate</p> Signup and view all the answers

    What process fluid outlet temperature range is achievable with oil bath heaters?

    <p>Up to 260°C</p> Signup and view all the answers

    What is the primary advantage of using salt baths over oil baths in heaters?

    <p>Higher process outlet temperatures</p> Signup and view all the answers

    What is the purpose of glycol in water bath heaters in colder climates?

    <p>To reduce the freezing point of the media</p> Signup and view all the answers

    What is the maximum process outlet temperature that can be achieved using steam bath heaters?

    <p>110°C</p> Signup and view all the answers

    What is the typical composition of the salt mixture used in salt bath heaters?

    <p>Sodium nitrite, potassium nitrite, and potassium nitrate</p> Signup and view all the answers

    What is the primary advantage of using oil bath heaters over water bath heaters?

    <p>Uniform heat transfer to process fluids</p> Signup and view all the answers

    What is the maximum steam pressure that can be safely handled by steam bath heaters?

    <p>100 kPa</p> Signup and view all the answers

    In indirect fired heaters, what is the immediate source of heat for the process fluid in the heating tubes?

    <p>Heat from the burner firetube</p> Signup and view all the answers

    What role do the smooth bends of the firetube play in indirect fired heaters?

    <p>Promote a low pressure drop</p> Signup and view all the answers

    In indirect fired heaters, where is the operating liquid level usually maintained?

    <p>Above the process tube bundle</p> Signup and view all the answers

    What is the purpose of the expansion tank in indirect fired heaters?

    <p>Accommodate temperature changes</p> Signup and view all the answers

    Which media are commonly used for different temperature applications in indirect fired heaters?

    <p>Glycol and salt solutions</p> Signup and view all the answers

    How do indirect fired heaters transfer heat to the process fluid heating tubes?

    <p>Via immersion in an intermediate fluid</p> Signup and view all the answers

    What indicates insufficient air in a burner flame?

    <p>A yellow flame</p> Signup and view all the answers

    How is the temperature of the fluid passing through the coil regulated?

    <p>By adjusting the thermostat setting</p> Signup and view all the answers

    What happens when the main burner reaches the desired heat transfer fluid temperature?

    <p>It cycles on and off to maintain the temperature</p> Signup and view all the answers

    How is the heater shut down?

    <p>By turning off the fuel supply valve</p> Signup and view all the answers

    What should be observed during normal heater operation?

    <p>The burner operation, process outlet temperature, and heater condition</p> Signup and view all the answers

    What happens to the residual gas in the burner manifold during shutdown?

    <p>It is burnt off</p> Signup and view all the answers

    What is the typical temperature set point for a glycol heater?

    <p>80 to 90°C</p> Signup and view all the answers

    What is the purpose of preheating the fuel in an indirect fired heater?

    <p>To improve combustion efficiency</p> Signup and view all the answers

    What is the role of the thermostat in an indirect fired heater?

    <p>To sense the heater bath temperature</p> Signup and view all the answers

    What is the primary fuel used in indirect fired heaters?

    <p>Natural gas or propane</p> Signup and view all the answers

    What is the correct sequence of steps to start up an indirect fired heater?

    <p>Check components, inspect fuel pressure regulator, and open the main inlet gas valve</p> Signup and view all the answers

    What is the purpose of checking the condition of all heater components before start-up?

    <p>To identify potential safety hazards</p> Signup and view all the answers

    How should the burner flame be adjusted for optimal operation?

    <p>By decreasing the gas flow and increasing the secondary air intake</p> Signup and view all the answers

    What should be done if a yellow flame is observed on the burner?

    <p>Adjust the air damper</p> Signup and view all the answers

    How is the fluid temperature regulated within the heating coil?

    <p>By adjusting the thermostat setting</p> Signup and view all the answers

    What indicates that the main burner has reached the desired heat transfer fluid temperature?

    <p>The flame becomes a stable blue flame</p> Signup and view all the answers

    How can the heater be safely shut down?

    <p>Turn off the fuel supply valve and then block the process stream</p> Signup and view all the answers

    What should be monitored when the process outlet temperature is checked often?

    <p>The level of the heat transfer fluid</p> Signup and view all the answers

    What is the purpose of the pilot in an indirect fired heater?

    <p>To provide continuous heat and keep the pilot lighted at all times</p> Signup and view all the answers

    What is the recommended operating temperature range for a glycol heater?

    <p>80°C to 90°C</p> Signup and view all the answers

    What should be ensured before starting the heater in terms of components?

    <p>All fittings, connections, piping, and tubing are tight and leak-free</p> Signup and view all the answers

    What regulates the gas pressure at the main burner for an indirect fired heater?

    <p>The main burner fuel pressure regulator</p> Signup and view all the answers

    What is the main criterion for switching the main burner on/off in an indirect fired heater?

    <p>Heater bath temperature sensed by the thermostat</p> Signup and view all the answers

    Which component is responsible for igniting the pilot in an indirect fired heater?

    <p>Portable igniter</p> Signup and view all the answers

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