Boiler Safety Systems Quiz
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Questions and Answers

According to the text, which code provides guidelines for the layout of combustion safety components, especially those found on boilers?

  • CSA B149.1 code
  • ASME code
  • NFPA code
  • CSA B149.3 code (correct)

    • Why does Figure 1 differ from other fuel trains shown in the PanGlobal Fourth Class text?

  • Due to compliance with different approval standards
  • Due to changes in the fuel pressure and firing capacity (correct)
  • Due to the use of propane instead of natural gas
  • Due to modifications in the boiler construction

    • What is the purpose of CSA B149.3 Code mentioned in the text?

  • To provide guidelines for natural gas and propane burners installation (correct)
  • To mandate the construction and design of larger capacity burners
  • To regulate the certification of existing burners
  • To cover appliances constructed and designed to meet an approved standard

    • Which organizations mandate the existence of safety components for burner systems?

    <p>CSA and NFPA</p> Signup and view all the answers

    In what scenarios does CSA B149.3 Code apply, according to the text?

    <p>For certified burners that are upgraded or modified</p> Signup and view all the answers

    Why do fuel trains shown in the PanGlobal Fourth Class text differ from each other?

    <p>Due to changes in burner firing capacity</p> Signup and view all the answers

    What is the purpose of preheating the fuel mentioned in the text?

    <p>To reduce the viscosity for proper atomization by the burner</p> Signup and view all the answers

    Why is poor atomization of the fuel a concern?

    <p>It results in toxic and explosive carbon monoxide formation</p> Signup and view all the answers

    What is the function of the low oil temperature cut-off?

    <p>To prevent the burner from starting when the fuel oil temperature falls below the recommended viscosity range</p> Signup and view all the answers

    Why is it essential to supervise the atomizing media pressure for a steam or air atomized burner?

    <p>To avoid damage to refractory and heat transfer surfaces</p> Signup and view all the answers

    What is the consequence of atomizing media pressure falling below the manufacturer’s design pressure for a steam or air atomized burner?

    <p>Safety shutdown and lockout</p> Signup and view all the answers

    Why is it important for a fuel to be properly atomized by the burner?

    <p>To reduce the risk of incomplete combustion</p> Signup and view all the answers

    What is the purpose of the fuel strainer (B) in the natural gas fuel train for boilers over 3000 kW output?

    <p>To catch debris before it affects the operation of fuel pressure regulators and control valves</p> Signup and view all the answers

    What role do the pressure relief valves (D) serve in the natural gas fuel train for boilers over 3000 kW output?

    <p>To protect the pilot and main burner controls from excessive fuel pressure</p> Signup and view all the answers

    Where should a low gas pressure safety device be installed for appliances with inputs in excess of 120 kW?

    <p>Downstream of the pressure regulator, upstream of the safety shut-off valve or valves, and upstream of the flow control valve</p> Signup and view all the answers

    What is the purpose of a high gas pressure safety device according to CSA B149.3?

    <p>To initiate shut-off of the supply of gas when the gas pressure at the high gas pressure safety device exceeds 125% of the normal operating pressure at the maximum firing rate</p> Signup and view all the answers

    What is a requirement for main fuel safety shut-off valves (SSOVs) according to CSA B149.3?

    <p>They must bear approval symbol CSA 6.5-2015 Automatic Valves for Gas Appliances</p> Signup and view all the answers

    Where is a high gas pressure cut-off switch (HGPCO) typically located in a natural gas fuel train for boilers over 3000 kW output?

    <p>Just upstream of the input flow control valve</p> Signup and view all the answers

    What is the purpose of the safety vent valve in a fuel train system?

    <p>To prevent fuel gas from leaking into the combustion chamber if the main SSOVs fail to close completely</p> Signup and view all the answers

    Why are safety vent valves typically fast-acting and normally-open solenoid valves?

    <p>To ensure immediate reduction of fuel pressure to atmospheric if the main SSOVs fail to close</p> Signup and view all the answers

    What is the function of the inlet flow control valve in a fuel train system with fully modulating burners?

    <p>To control the fuel flow based on load demand for different firing rates</p> Signup and view all the answers

    Why is the firing rate control valve placed downstream of the low gas pressure cut-off switch?

    <p>To ensure that low gas pressure does not actuate at low firing rates</p> Signup and view all the answers

    What is the purpose of test firing valves in a fuel train system?

    <p>To test the operation of flame detection devices and high fuel pressure cut-off</p> Signup and view all the answers

    Why do pilot safety shut-off valves usually not have proof of closure according to the text?

    <p>Because they shut off a small fuel throughput compared to the main burner and do not require proof of closure</p> Signup and view all the answers

    What is the purpose of fuel pressure test ports in a fuel train system?

    <p>To monitor and adjust the fuel pressure during burner operation</p> Signup and view all the answers

    What unique components might be found in a fuel oil train that are not typically used in a fuel gas train?

    <p>Fuel filter, fuel pump, low oil temperature cut-off switch, and low atomizing media cut-off switch</p> Signup and view all the answers

    What is the purpose of a fuel filter in an oil fuel train?

    <p>To protect oil burner nozzles from plugging due to suspended fuel contaminants</p> Signup and view all the answers

    Why must oil trains have fuel pumps?

    <p>To provide necessary flow and pressure for proper atomization at maximum firing rate</p> Signup and view all the answers

    What is the function of the low oil temperature cut-off switch?

    <p>To stop the flow of fuel to an oil burner that fires oil requiring preheating</p> Signup and view all the answers

    What is the purpose of ASME CSD-1 Controls and Safety Devices for Automatically Fired Boilers mentioned in the text?

    <p>To provide guidelines for layout of combustion safety components especially on boilers</p> Signup and view all the answers

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