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Questions and Answers
What should be done if the gauge glass cannot be suitably isolated?
What should be done if the gauge glass cannot be suitably isolated?
- Depressurize the piping around the valve before tightening (correct)
- Proceed with the tightening of the valve packing
- Close the steam side isolation valve first
- Tighten the valve packing nuts immediately
What is the caution regarding tightening packing or valve bonnet gaskets?
What is the caution regarding tightening packing or valve bonnet gaskets?
- Depressurize the pipework around the valve before tightening (correct)
- Tighten the nuts unevenly to avoid distortion
- Ensure the gland remains parallel to the stem
- Only tighten the gland if the packing is completely compressed
What should be ensured when tightening the gland of a valve with a leaking stem?
What should be ensured when tightening the gland of a valve with a leaking stem?
- Tighten the nuts unevenly for better sealing
- Completely compress the packing to ensure no leakage
- Use a random pattern for tightening
- Ensure the gland remains perpendicular to the stem (correct)
What is the purpose of using a cross bolting pattern when dealing with a leak on the bonnet or flange?
What is the purpose of using a cross bolting pattern when dealing with a leak on the bonnet or flange?
What should be avoided when tightening the packing gland of a centrifugal pump?
What should be avoided when tightening the packing gland of a centrifugal pump?
What is the purpose of blowing down drip legs in a steam system?
What is the purpose of blowing down drip legs in a steam system?
When repairing gauge glass valve stem leaks, why should the boiler water level control system be checked?
When repairing gauge glass valve stem leaks, why should the boiler water level control system be checked?
What should be done before repairing gauge glass valve stem leaks while the boiler is on-line?
What should be done before repairing gauge glass valve stem leaks while the boiler is on-line?
Why is it necessary to close the steam side gauge glass isolation valve when repairing gauge glass valve stem leaks?
Why is it necessary to close the steam side gauge glass isolation valve when repairing gauge glass valve stem leaks?
What is the primary purpose of opening the gauge glass drain when repairing gauge glass valve stem leaks?
What is the primary purpose of opening the gauge glass drain when repairing gauge glass valve stem leaks?
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Study Notes
Gauge Glass Valve Stem Leaks
- If the gauge glass cannot be suitably isolated, alternative arrangements must be made to ensure safe repair.
- When tightening packing or valve bonnet gaskets, be cautious not to overtighten, as this can cause damage to the gasket or surrounding material.
Valve Repair
- When tightening the gland of a valve with a leaking stem, ensure the stem is central and not rotated during the process.
- A cross-bolting pattern is used when dealing with a leak on the bonnet or flange to ensure even pressure and prevent further damage.
Centrifugal Pump Maintenance
- When tightening the packing gland of a centrifugal pump, avoid using excessive force, as this can damage the pump shaft or surrounding components.
Steam System Maintenance
- The purpose of blowing down drip legs in a steam system is to remove any accumulated condensate and sediment.
Boiler Repair Precautions
- When repairing gauge glass valve stem leaks, the boiler water level control system should be checked to ensure proper function and safety.
- Before repairing gauge glass valve stem leaks while the boiler is on-line, the steam side gauge glass isolation valve must be closed to ensure safe working conditions.
- The primary purpose of opening the gauge glass drain when repairing gauge glass valve stem leaks is to allow for safe drainage and prevent further damage.
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