20 Questions
What is the purpose of increasing the rate of continuous blowdown and bottom blowoff several days before shutting down the boiler?
To discharge sediment and sludge that may have accumulated in the boiler
What action should be taken if the flame is unusually smoky, asymmetrical, or impinging on boiler surfaces?
Employ a certified burner service technician to adjust the burner
Which control should be tested during the shutdown procedure to ensure safety?
Low water cut-off
What is the purpose of transferring load to other operating boilers during a shutdown?
To test safety interlocks without interrupting production
Why is it important to adjust the chemical feed rates before shutting down the boiler?
To accommodate an increase in make-up water
What is the purpose of observing the flame for irregularity before shutting down a boiler?
To ensure proper combustion and prevent damage to boiler surfaces
What should be done with the low water cut-off during a boiler shutdown procedure?
Tested to ensure proper operation
What could happen if irregularities in the flame are not addressed before returning a boiler to service?
Increased risk of damage to boiler surfaces
What impact does increasing make-up water have on the boiler before shutdown?
'Dilutes' the chemical content in the boiler water
Why is it important to test all operating and limit controls during a boiler shutdown procedure?
To validate proper operation and safety.
What is the purpose of performing a safety valve pop test during the shutdown of a boiler?
To check the performance of the safety valves under operating conditions
What is the purpose of opening the steam drum vent valve during the boiler shutdown?
To prevent a vacuum from forming in the boiler
Why is it important to record the results of all limit tests in the log book during a boiler shutdown?
To comply with safety regulations and procedures
What is the purpose of using a lockbox and numbered group lockout locks during a boiler lockout?
To ensure that all electrically operated equipment is de-energized
What is the purpose of sealing the lockbox with a car seal during a boiler lockout?
To prevent unauthorized access to the lockbox
Why do contractors and plant employees place their personal locks on the lockbox during boiler maintenance?
To indicate their involvement in the maintenance work
What is the purpose of adding a supervisor or operations lock to the lockbox during a boiler lockout?
To ensure that the lockout was performed correctly
Why is it important for a second qualified operator to verify that all lockout points are locked during a group lockout?
To provide an additional layer of verification for safety
What is the purpose of isolating the boiler from the main header during a shutdown?
To ensure safe isolation from steam supply
Why should workers sign-off that their work is complete before removing personal locks from the lockbox?
To ensure that no unauthorized work is carried out on the boiler
Learn the general steps for shutting down a steam boiler to maintain stable steam system pressures and transfer load to other operating boilers. This procedure also provides an opportunity to test safety interlocks without interrupting production, and for maintenance, inspection, or layup.
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