48 Questions
EASY What is the consequence of a poorly designed or inefficiently run feed system?
High corrosion costs and equipment damage
Where can the chemical feed pump inject chemicals?
To the boiler drum, feedwater line, or deaerator
Why must a relief valve be installed on the discharge of the pump?
To prevent over-pressurization of the piping and fittings
What type of pumps are chemical feed pumps?
Positive displacement, high-pressure, low-capacity
How is the flow rate of a chemical feed pump adjusted?
By adjusting the length of the pump stroke
What is the purpose of the shut-off valve next to the boiler?
To shut off the chemical feed line in case of emergency
What is the purpose of the check valve between the chemical feed pump and the shut-off valve?
To prevent backflow of chemicals into the pump
What is the purpose of calibrating the dial on a diaphragm chemical pump?
To cross-reference the flow rate to the manufacturer's flow rates
What is the basis for adjusting the variable pump stroke?
Boiler feedwater flow rate
What type of pumps require boiler feedwater flow to operate?
Some power plant chemical feed pumps
What is the primary function of a chemical feeder?
To supply chemicals to the return line of a hot water circulating system
What type of feeder is used for closed water heating systems with low make-up water requirements?
Simple feeder
What is the first step in adding chemicals to a bypass feeder?
Close the inlet valve
Why is it essential to wear proper PPE when working with chemical feeders?
To protect from hot water and pressure
What is the purpose of the vent on a chemical shot feeder?
To assist with removing air from the feeder
What is the purpose of the pressure gauge on a chemical shot feeder?
To indicate if the feeder is in service
MEDIUM What happens to certain pumps if there is no boiler feedwater flow?
They cannot operate
What is the purpose of a variable area meter in a chemical feed pump arrangement?
To adjust the variable pump stroke
What type of feeder is used for closed water heating systems with low make-up water requirements?
Simple feeder
What should be done before adding chemicals to a bypass feeder?
Close the outlet valve
What is the purpose of the vent on a chemical shot feeder?
To assist with removing air from the feeder
Why is it essential to wear proper PPE when working with chemical feeders?
To protect from chemical exposure and splashes
What should be checked after filling the feed pot with system water?
The cover gasket
What is the purpose of the pressure gauge on a chemical shot feeder?
To indicate if the feeder is in service
What is the primary reason for regularly checking and maintaining chemical feed pumps?
To reduce the risk of corrosion and equipment damage
What is the purpose of a shut-off valve next to the boiler in a chemical feed system?
To isolate the chemical feed pump for maintenance
What is the function of the check valve in a chemical feed system?
To prevent backflow of chemicals into the pump
What is the advantage of using a diaphragm chemical pump with an adjustable flow rate?
It allows for more accurate control of chemical flow
What is the risk of not having a relief valve on the discharge of a chemical feed pump?
The pump will over-pressurize the piping and fittings
What is the benefit of using a solenoid-type pump in a chemical injection system?
It enables simultaneous supply of different chemicals to different parts of the plant
What is the purpose of calibrating the dial on a diaphragm chemical pump?
To cross-reference the flow rate with the manufacturer's recommendations
Why is it essential to follow the manufacturer's recommendations for maintaining chemical feed pumps?
To ensure safe and efficient operation of the boiler
HARD What is the primary consequence of an inefficiently run chemical feed system?
Increased chemical costs and poor steam quality
What is the purpose of the check valve in a chemical feed system?
To prevent backflow of chemicals into the pump
Why is it necessary to install a relief valve on the discharge of a chemical feed pump?
To prevent over-pressurization of the piping and fittings
What is the benefit of using a diaphragm chemical pump with an adjustable flow rate?
It allows for accurate control of the chemical feed
What is the purpose of the shut-off valve next to the boiler in a chemical feed system?
To isolate the chemical feed line for maintenance
What is the primary function of a chemical feeder in a boiler system?
To supply the necessary chemicals to the boiler water
What is the risk of not having a relief valve on the discharge of a chemical feed pump?
Over-pressurization of the piping and fittings
What is the advantage of using solenoid-type pumps in a chemical injection system?
They provide multiple points of injection with precise control
What is the primary function of the drain valve in a bypass feeder?
To drain water from the feeder before adding chemicals
What is the purpose of cracking open the inlet valve when filling the feed pot with system water?
To allow system water to flow into the feed pot while venting air
Why is it essential to ensure the cover gasket is properly aligned and in good condition before replacing the feed pot cover?
To prevent chemical leakage
What is the primary advantage of using a solenoid-type pump in a chemical injection system?
It is more reliable and requires less maintenance
What is the purpose of the shut-off valve next to the boiler in a chemical feed system?
To isolate the boiler for maintenance
What is the primary function of the check valve in a chemical feed system?
To prevent backflow into the boiler
What is the primary risk of not having a relief valve on the discharge of a chemical feed pump?
The system may experience a pressure buildup
What is the primary advantage of using a diaphragm chemical pump with an adjustable flow rate?
It allows for precise control over the chemical dosage
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.
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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