42 Questions
EASY What could happen if the piping around the valve is not depressurized before tightening?
The packing and flange gaskets may fail and cause injury
Why should the packing gland nuts be tightened evenly?
To ensure the gland remains perpendicular to the stem
What is the purpose of a stuffing box in a centrifugal pump?
To allow a continuous flow between the shaft and packing
Why should the leakage not be completely stopped when tightening the packing gland on a pump?
The packing might overheat and damage the pump shaft
What pattern should be used when tightening the bolts on a valve bonnet or flange?
A cross pattern
Why is it important to ensure the gland remains perpendicular to the pump shaft?
To ensure even tightening
What is the purpose of blowing down drip legs in a steam system?
To remove excess accumulations of condensate
What is a common problem with gauge glass isolating valves?
They leak through the valve packing
What should be done before repairing a gauge glass leak?
Ensure the boiler water level control system is functioning correctly
Why should you not tighten packing on a valve that is under pressure?
Because it may be unsafe for the operator
What should be done after tightening the valve packing nuts?
Close the drain valve
What is the correct procedure for repairing gauge glass leaks?
Close the steam side gauge glass isolation valve, then close the waterside gauge glass isolation valve
What should be done if the gauge glass cannot be suitably isolated?
DO NOT proceed with the repair
Why is it important to depressurize the piping around a valve before tightening?
To ensure safety
MEDIUM What is the consequence of not depressurizing the piping around a valve before tightening?
The packing and flange gaskets may fail, causing injury
When tightening the packing gland nuts on a valve, what should be ensured?
The gland is adjusted evenly and remains perpendicular to the stem
What is the purpose of a stuffing box in a centrifugal pump?
To allow a continuous flow between the shaft and packing
What should be avoided when tightening the packing gland on a pump?
Stopping the leakage completely
What pattern should be used when tightening the bolts on a valve bonnet or flange?
A cross pattern
Why is it important to avoid compressing the packing too much when tightening the packing gland on a valve?
To make the valve easier to turn
What is the purpose of blowing down drip legs in a steam system?
To remove excess accumulations of condensate
What is a common problem with gauge glass isolating valves?
They can leak through the valve packing
What should be done to a gauge glass before proceeding with repairs?
Allow it to come to operating temperature
What is the correct sequence for repairing a gauge glass leak?
Close the steam side, then the waterside, then open the drain
What should be done before tightening the valve packing nuts?
Depressurize the gauge glass
Why is it important to confirm the boiler water level control system is functioning correctly?
To ensure the repair can be done safely
What should be done after tightening the valve packing nuts?
All of the above
What should be done if the gauge glass cannot be suitably isolated?
Do not proceed with the repair
HARD What is the primary concern when tightening the packing gland nuts on a valve?
Ensuring the gland remains perpendicular to the stem
What is the consequence of compressing the packing too much when tightening the packing gland on a valve?
The valve may be difficult to turn
What is the purpose of using a cross bolting pattern when tightening the bolts on a valve bonnet or flange?
To prevent the bonnet or flange from distorting
What is the primary function of a stuffing box in a centrifugal pump?
To allow a continuous flow between the shaft and packing
Why should the leakage not be completely stopped when tightening the packing gland on a pump?
To prevent the packing from overheating
What is the correct procedure when tightening the packing gland nuts on a valve?
Tighten the nuts evenly and ensure the gland remains perpendicular to the stem
What is the primary reason for blowing down drip legs in a steam system?
To remove excess accumulations of condensate
In what situation can a gauge glass leak be repaired while the boiler is on-line?
When the leak is minor and doesn't pose a hazard
What is the correct sequence of steps to take when repairing a gauge glass leak?
Close the steam side gauge glass isolation valve, then close the waterside gauge glass isolation valve
What is the primary purpose of a drip leg in a steam system?
To collect and remove condensate from the system
What is the consequence of not confirming the boiler water level control system is functioning correctly?
The boiler water level may become unstable
Why is it essential to slowly open the steam side and waterside isolation valves after repairing a gauge glass leak?
To prevent sudden pressure changes
In what situation should the valve packing nuts not be tightened?
When the valve is under pressure
What should be done before attempting to repair a gauge glass leak if the glass cannot be suitably isolated?
Wait until the boiler is shut down for maintenance
Study Notes
Maintenance Tasks for Operators
- Operators are responsible for various maintenance tasks, including blowing down drip legs, repairing gauge glass leaks, and assessing packing leaks.
Drip Leg Blowdown
- Drip leg blowdown is a common maintenance task performed every shift to remove excess condensate accumulations in steam systems.
- The process involves opening and reclosing the drain valves on drip legs located in the low points of a steam system.
Gauge Glass Valve Stem Leaks
- Gauge glass isolating valves may leak through the valve packing, allowing steam and water to pass.
- Leaks can be repaired while the boiler is on-line, following a 13-step procedure:
- Ensure the boiler water level control system is functioning correctly.
- Confirm a secondary method of monitoring boiler water level.
- Close the steam and waterside gauge glass isolation valves.
- Open the gauge glass drain.
- Confirm the gauge glass is depressurized.
- Tighten the valve packing nuts.
- Close the drain valve.
- Allow the glass to come to operating temperature before proceeding.
- Slowly open the steam and waterside isolation valves.
- Check for leaks.
Valve Packing and Bonnet Leaks
- Valve leaks can occur in boiler plants, and can be stopped by tightening the valve packing nuts or replacing the flange gaskets.
- Before tightening, ensure the piping around the valve is depressurized to avoid injury or further damage.
- Tighten the packing gland nuts evenly and perpendicularly to the stem.
- Avoid over-compressing the packing, and only tighten as much as necessary to stop the leak.
Stuffing Box
- Stuffing boxes allow a continuous flow between the shaft and packing of a centrifugal pump.
- If the leakage is excessive, the packing gland can be tightened to reduce it to an acceptable amount.
- Ensure the gland is adjusted evenly and remains perpendicular to the pump shaft.
- Avoid completely stopping the leakage, as it can cause the packing to overheat and damage the pump shaft.
Maintenance Tasks for Operators
- Operators are responsible for various maintenance tasks, including blowing down drip legs, repairing gauge glass leaks, and assessing packing leaks.
Drip Leg Blowdown
- Drip leg blowdown is a common maintenance task performed every shift to remove excess condensate accumulations in steam systems.
- The process involves opening and reclosing the drain valves on drip legs located in the low points of a steam system.
Gauge Glass Valve Stem Leaks
- Gauge glass isolating valves may leak through the valve packing, allowing steam and water to pass.
- Leaks can be repaired while the boiler is on-line, following a 13-step procedure:
- Ensure the boiler water level control system is functioning correctly.
- Confirm a secondary method of monitoring boiler water level.
- Close the steam and waterside gauge glass isolation valves.
- Open the gauge glass drain.
- Confirm the gauge glass is depressurized.
- Tighten the valve packing nuts.
- Close the drain valve.
- Allow the glass to come to operating temperature before proceeding.
- Slowly open the steam and waterside isolation valves.
- Check for leaks.
Valve Packing and Bonnet Leaks
- Valve leaks can occur in boiler plants, and can be stopped by tightening the valve packing nuts or replacing the flange gaskets.
- Before tightening, ensure the piping around the valve is depressurized to avoid injury or further damage.
- Tighten the packing gland nuts evenly and perpendicularly to the stem.
- Avoid over-compressing the packing, and only tighten as much as necessary to stop the leak.
Stuffing Box
- Stuffing boxes allow a continuous flow between the shaft and packing of a centrifugal pump.
- If the leakage is excessive, the packing gland can be tightened to reduce it to an acceptable amount.
- Ensure the gland is adjusted evenly and remains perpendicular to the pump shaft.
- Avoid completely stopping the leakage, as it can cause the packing to overheat and damage the pump shaft.
Maintenance Tasks for Operators
- Operators are responsible for various maintenance tasks, including blowing down drip legs, repairing gauge glass leaks, and assessing packing leaks.
Drip Leg Blowdown
- Drip leg blowdown is a common maintenance task performed every shift to remove excess condensate accumulations in steam systems.
- The process involves opening and reclosing the drain valves on drip legs located in the low points of a steam system.
Gauge Glass Valve Stem Leaks
- Gauge glass isolating valves may leak through the valve packing, allowing steam and water to pass.
- Leaks can be repaired while the boiler is on-line, following a 13-step procedure:
- Ensure the boiler water level control system is functioning correctly.
- Confirm a secondary method of monitoring boiler water level.
- Close the steam and waterside gauge glass isolation valves.
- Open the gauge glass drain.
- Confirm the gauge glass is depressurized.
- Tighten the valve packing nuts.
- Close the drain valve.
- Allow the glass to come to operating temperature before proceeding.
- Slowly open the steam and waterside isolation valves.
- Check for leaks.
Valve Packing and Bonnet Leaks
- Valve leaks can occur in boiler plants, and can be stopped by tightening the valve packing nuts or replacing the flange gaskets.
- Before tightening, ensure the piping around the valve is depressurized to avoid injury or further damage.
- Tighten the packing gland nuts evenly and perpendicularly to the stem.
- Avoid over-compressing the packing, and only tighten as much as necessary to stop the leak.
Stuffing Box
- Stuffing boxes allow a continuous flow between the shaft and packing of a centrifugal pump.
- If the leakage is excessive, the packing gland can be tightened to reduce it to an acceptable amount.
- Ensure the gland is adjusted evenly and remains perpendicular to the pump shaft.
- Avoid completely stopping the leakage, as it can cause the packing to overheat and damage the pump shaft.
This quiz covers common maintenance tasks for steam systems, including blowing down drip legs, repairing gauge glass leaks, and assessing packing leaks. It's essential for operators to understand these tasks to ensure system efficiency and safety.
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