Shutting Down Steam Boilers Procedure

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What is the purpose of increasing the rate of continuous blowdown and bottom blowoff several days before shutting down the boiler?

To reduce the frequency of bottom blowoff

To discharge sediment and sludge that may have accumulated in the boiler (correct)

To decrease the rate of make-up water

To increase the pressure inside the boiler

What action should be taken if the flame is unusually smoky, asymmetrical, or impinging on boiler surfaces?

Increase the fuel supply to the burner

Continue operating the boiler as usual

Employ a certified burner service technician to adjust the burner (correct)

Reduce the rate of continuous blowdown

Which control should be tested during the shutdown procedure to ensure safety?

High-pressure steam cut-off

Low water cut-off (correct)

Temperature control

Combination feeder/cut-off control or pump control

What is the purpose of transferring load to other operating boilers during a shutdown?

To test safety interlocks without interrupting production Signup and view all the answers

Why is it important to adjust the chemical feed rates before shutting down the boiler?

To accommodate an increase in make-up water Signup and view all the answers

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 Signup and view all the answers

What should be done with the low water cut-off during a boiler shutdown procedure?

Tested to ensure proper operation Signup and view all the answers

What could happen if irregularities in the flame are not addressed before returning a boiler to service?

Increased risk of damage to boiler surfaces Signup and view all the answers

What impact does increasing make-up water have on the boiler before shutdown?

'Dilutes' the chemical content in the boiler water Signup and view all the answers

Why is it important to test all operating and limit controls during a boiler shutdown procedure?

To validate proper operation and safety. Signup and view all the answers

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 Signup and view all the answers

What is the purpose of opening the steam drum vent valve during the boiler shutdown?

To prevent a vacuum from forming in the boiler Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

What is the purpose of sealing the lockbox with a car seal during a boiler lockout?

To prevent unauthorized access to the lockbox Signup and view all the answers

Why do contractors and plant employees place their personal locks on the lockbox during boiler maintenance?

To indicate their involvement in the maintenance work Signup and view all the answers

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 Signup and view all the answers

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 Signup and view all the answers

What is the purpose of isolating the boiler from the main header during a shutdown?

To ensure safe isolation from steam supply Signup and view all the answers

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 Signup and view all the answers