4BE3 U6 C2 Obj 2 EMH
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EASY What is the consequence of a poorly designed or inefficiently run feed system?

  • Improved steam quality
  • Reduced chemical costs
  • Increased boiler efficiency
  • High corrosion costs and equipment damage (correct)

    • Where can the chemical feed pump inject chemicals?

  • Only to the deaerator
  • Only to the boiler drum
  • To the steam header
  • To the boiler drum, feedwater line, or deaerator (correct)

    • Why must a relief valve be installed on the discharge of the pump?

  • To prevent over-pressurization of the piping and fittings (correct)
  • To increase pump pressure
  • To reduce pump flow rate
  • To increase chemical dosage

    • What type of pumps are chemical feed pumps?

    <p>Positive displacement, high-pressure, low-capacity</p> Signup and view all the answers

    How is the flow rate of a chemical feed pump adjusted?

    <p>By adjusting the length of the pump stroke</p> Signup and view all the answers

    What is the purpose of the shut-off valve next to the boiler?

    <p>To shut off the chemical feed line in case of emergency</p> Signup and view all the answers

    What is the purpose of the check valve between the chemical feed pump and the shut-off valve?

    <p>To prevent backflow of chemicals into the pump</p> Signup and view all the answers

    What is the purpose of calibrating the dial on a diaphragm chemical pump?

    <p>To cross-reference the flow rate to the manufacturer's flow rates</p> Signup and view all the answers

    What is the basis for adjusting the variable pump stroke?

    <p>Boiler feedwater flow rate</p> Signup and view all the answers

    What type of pumps require boiler feedwater flow to operate?

    <p>Some power plant chemical feed pumps</p> Signup and view all the answers

    What is the primary function of a chemical feeder?

    <p>To supply chemicals to the return line of a hot water circulating system</p> Signup and view all the answers

    What type of feeder is used for closed water heating systems with low make-up water requirements?

    <p>Simple feeder</p> Signup and view all the answers

    What is the first step in adding chemicals to a bypass feeder?

    <p>Close the inlet valve</p> Signup and view all the answers

    Why is it essential to wear proper PPE when working with chemical feeders?

    <p>To protect from hot water and pressure</p> Signup and view all the answers

    What is the purpose of the vent on a chemical shot feeder?

    <p>To assist with removing air from the feeder</p> Signup and view all the answers

    What is the purpose of the pressure gauge on a chemical shot feeder?

    <p>To indicate if the feeder is in service</p> Signup and view all the answers

    MEDIUM What happens to certain pumps if there is no boiler feedwater flow?

    <p>They cannot operate</p> Signup and view all the answers

    What is the purpose of a variable area meter in a chemical feed pump arrangement?

    <p>To adjust the variable pump stroke</p> Signup and view all the answers

    What type of feeder is used for closed water heating systems with low make-up water requirements?

    <p>Simple feeder</p> Signup and view all the answers

    What should be done before adding chemicals to a bypass feeder?

    <p>Close the outlet valve</p> Signup and view all the answers

    What is the purpose of the vent on a chemical shot feeder?

    <p>To assist with removing air from the feeder</p> Signup and view all the answers

    Why is it essential to wear proper PPE when working with chemical feeders?

    <p>To protect from chemical exposure and splashes</p> Signup and view all the answers

    What should be checked after filling the feed pot with system water?

    <p>The cover gasket</p> Signup and view all the answers

    What is the purpose of the pressure gauge on a chemical shot feeder?

    <p>To indicate if the feeder is in service</p> Signup and view all the answers

    What is the primary reason for regularly checking and maintaining chemical feed pumps?

    <p>To reduce the risk of corrosion and equipment damage</p> Signup and view all the answers

    What is the purpose of a shut-off valve next to the boiler in a chemical feed system?

    <p>To isolate the chemical feed pump for maintenance</p> Signup and view all the answers

    What is the function of the check valve in a chemical feed system?

    <p>To prevent backflow of chemicals into the pump</p> Signup and view all the answers

    What is the advantage of using a diaphragm chemical pump with an adjustable flow rate?

    <p>It allows for more accurate control of chemical flow</p> Signup and view all the answers

    What is the risk of not having a relief valve on the discharge of a chemical feed pump?

    <p>The pump will over-pressurize the piping and fittings</p> Signup and view all the answers

    What is the benefit of using a solenoid-type pump in a chemical injection system?

    <p>It enables simultaneous supply of different chemicals to different parts of the plant</p> Signup and view all the answers

    What is the purpose of calibrating the dial on a diaphragm chemical pump?

    <p>To cross-reference the flow rate with the manufacturer's recommendations</p> Signup and view all the answers

    Why is it essential to follow the manufacturer's recommendations for maintaining chemical feed pumps?

    <p>To ensure safe and efficient operation of the boiler</p> Signup and view all the answers

    HARD What is the primary consequence of an inefficiently run chemical feed system?

    <p>Increased chemical costs and poor steam quality</p> Signup and view all the answers

    What is the purpose of the check valve in a chemical feed system?

    <p>To prevent backflow of chemicals into the pump</p> Signup and view all the answers

    Why is it necessary to install a relief valve on the discharge of a chemical feed pump?

    <p>To prevent over-pressurization of the piping and fittings</p> Signup and view all the answers

    What is the benefit of using a diaphragm chemical pump with an adjustable flow rate?

    <p>It allows for accurate control of the chemical feed</p> Signup and view all the answers

    What is the purpose of the shut-off valve next to the boiler in a chemical feed system?

    <p>To isolate the chemical feed line for maintenance</p> Signup and view all the answers

    What is the primary function of a chemical feeder in a boiler system?

    <p>To supply the necessary chemicals to the boiler water</p> Signup and view all the answers

    What is the risk of not having a relief valve on the discharge of a chemical feed pump?

    <p>Over-pressurization of the piping and fittings</p> Signup and view all the answers

    What is the advantage of using solenoid-type pumps in a chemical injection system?

    <p>They provide multiple points of injection with precise control</p> Signup and view all the answers

    What is the primary function of the drain valve in a bypass feeder?

    <p>To drain water from the feeder before adding chemicals</p> Signup and view all the answers

    What is the purpose of cracking open the inlet valve when filling the feed pot with system water?

    <p>To allow system water to flow into the feed pot while venting air</p> Signup and view all the answers

    Why is it essential to ensure the cover gasket is properly aligned and in good condition before replacing the feed pot cover?

    <p>To prevent chemical leakage</p> Signup and view all the answers

    What is the primary advantage of using a solenoid-type pump in a chemical injection system?

    <p>It is more reliable and requires less maintenance</p> Signup and view all the answers

    What is the purpose of the shut-off valve next to the boiler in a chemical feed system?

    <p>To isolate the boiler for maintenance</p> Signup and view all the answers

    What is the primary function of the check valve in a chemical feed system?

    <p>To prevent backflow into the boiler</p> Signup and view all the answers

    What is the primary risk of not having a relief valve on the discharge of a chemical feed pump?

    <p>The system may experience a pressure buildup</p> Signup and view all the answers

    What is the primary advantage of using a diaphragm chemical pump with an adjustable flow rate?

    <p>It allows for precise control over the chemical dosage</p> Signup and view all the answers

    Study Notes

    Importance of Chemical Feed Systems

    • Well-designed and maintained chemical feed systems are crucial for safe and efficient boiler operation.
    • Inappropriately designed or inefficiently run feed systems can result in high corrosion costs, damage to equipment, extra chemical costs, and poor steam quality.

    Chemical Feed Pumps

    • Chemical feed pumps supply necessary chemicals to the boiler water through a small positive-displacement motor-driven metering pump.
    • Pumps can be connected to inject chemicals directly to the boiler drum, feedwater line, or deaerator.
    • Chemical feed pumps should be checked regularly and maintained according to manufacturer recommendations.
    • A shut-off valve next to the boiler and a check valve between the pump and shut-off valve are required.

    Chemical Feed Pumps Safety Features

    • A relief valve must be installed on the pump discharge, unless the pump has an internal relief mechanism.
    • This prevents over-pressurization of piping and fittings if a valve in the discharge line is shut while the pump is running.

    Adjustable Flow Rate

    • Chemical feed pumps are high-pressure, low-capacity types with adjustable flow rates.
    • Flow rates can be adjusted by altering the length of the pump stroke or the drive motor speed.

    Chemical Injection Systems

    • Figure 6(a) shows a complete chemical injection system with four solenoid-type pumps supplying different chemicals to different parts of the plant.
    • Each pump has a flow measurement and stroke adjustment feature.

    Chemical Feeders

    • Chemical feeders supply chemicals to the return line of a hot water circulating system or directly into a boiler, without using feed pumps.
    • Feeders are used for closed water heating systems with low make-up water requirements.

    Bypass Feeders

    • Bypass feeders, also known as "pot" or "shot" feeders, feed chemicals into the feedwater or circulating line.
    • Figure 7 shows a closed-type bypass feeder.

    Operating a Bypass Feeder

    • Follow the steps to add chemicals to the system, ensuring proper PPE is worn to protect from burns, chemical exposure, and splashes.

    Importance of Chemical Feed Systems

    • Well-designed and maintained chemical feed systems are crucial for safe and efficient boiler operation.
    • Inappropriately designed or inefficiently run feed systems can result in high corrosion costs, damage to equipment, extra chemical costs, and poor steam quality.

    Chemical Feed Pumps

    • Chemical feed pumps supply necessary chemicals to the boiler water through a small positive-displacement motor-driven metering pump.
    • Pumps can be connected to inject chemicals directly to the boiler drum, feedwater line, or deaerator.
    • Chemical feed pumps should be checked regularly and maintained according to manufacturer recommendations.
    • A shut-off valve next to the boiler and a check valve between the pump and shut-off valve are required.

    Chemical Feed Pumps Safety Features

    • A relief valve must be installed on the pump discharge, unless the pump has an internal relief mechanism.
    • This prevents over-pressurization of piping and fittings if a valve in the discharge line is shut while the pump is running.

    Adjustable Flow Rate

    • Chemical feed pumps are high-pressure, low-capacity types with adjustable flow rates.
    • Flow rates can be adjusted by altering the length of the pump stroke or the drive motor speed.

    Chemical Injection Systems

    • Figure 6(a) shows a complete chemical injection system with four solenoid-type pumps supplying different chemicals to different parts of the plant.
    • Each pump has a flow measurement and stroke adjustment feature.

    Chemical Feeders

    • Chemical feeders supply chemicals to the return line of a hot water circulating system or directly into a boiler, without using feed pumps.
    • Feeders are used for closed water heating systems with low make-up water requirements.

    Bypass Feeders

    • Bypass feeders, also known as "pot" or "shot" feeders, feed chemicals into the feedwater or circulating line.
    • Figure 7 shows a closed-type bypass feeder.

    Operating a Bypass Feeder

    • Follow the steps to add chemicals to the system, ensuring proper PPE is worn to protect from burns, chemical exposure, and splashes.

    Importance of Chemical Feed Systems

    • Well-designed and maintained chemical feed systems are crucial for safe and efficient boiler operation.
    • Inappropriately designed or inefficiently run feed systems can result in high corrosion costs, damage to equipment, extra chemical costs, and poor steam quality.

    Chemical Feed Pumps

    • Chemical feed pumps supply necessary chemicals to the boiler water through a small positive-displacement motor-driven metering pump.
    • Pumps can be connected to inject chemicals directly to the boiler drum, feedwater line, or deaerator.
    • Chemical feed pumps should be checked regularly and maintained according to manufacturer recommendations.
    • A shut-off valve next to the boiler and a check valve between the pump and shut-off valve are required.

    Chemical Feed Pumps Safety Features

    • A relief valve must be installed on the pump discharge, unless the pump has an internal relief mechanism.
    • This prevents over-pressurization of piping and fittings if a valve in the discharge line is shut while the pump is running.

    Adjustable Flow Rate

    • Chemical feed pumps are high-pressure, low-capacity types with adjustable flow rates.
    • Flow rates can be adjusted by altering the length of the pump stroke or the drive motor speed.

    Chemical Injection Systems

    • Figure 6(a) shows a complete chemical injection system with four solenoid-type pumps supplying different chemicals to different parts of the plant.
    • Each pump has a flow measurement and stroke adjustment feature.

    Chemical Feeders

    • Chemical feeders supply chemicals to the return line of a hot water circulating system or directly into a boiler, without using feed pumps.
    • Feeders are used for closed water heating systems with low make-up water requirements.

    Bypass Feeders

    • Bypass feeders, also known as "pot" or "shot" feeders, feed chemicals into the feedwater or circulating line.
    • Figure 7 shows a closed-type bypass feeder.

    Operating a Bypass Feeder

    • Follow the steps to add chemicals to the system, ensuring proper PPE is worn to protect from burns, chemical exposure, and splashes.

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    Description

    This quiz covers the importance of well-designed and maintained chemical feed systems for boiler operation, including the consequences of poorly designed systems and the methods used to supply necessary chemicals.

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