19 Questions
What is the purpose of having multiple boilers in larger steam systems?
To ensure additional capacity is available on standby
In a high-pressure steam plant, how are the headers identified?
By the pressures at which they operate
What could happen if the headers are not properly warmed up in a steam system?
Severe water hammer occurrence
Why do headers and the piping need to be properly warmed up in steam systems?
To decrease thermal stress
How are the different headers connected in sequence in a steam system?
The high pressure header lets down to the low pressure header
What is the purpose of having a 2500 kPa header in a high-pressure steam plant?
For intermediate pressure turbines and processes
What is the purpose of opening all drain valves at all system low points during the warm-up of steam headers?
To discharge condensate as the steam lines warm up, preventing water hammer
Why is it important to be familiar with the steam heating system prior to cutting in additional heating boilers?
To understand the warm-up procedure
When placing a steam heating boiler on line with other heating boilers that are already in service, what should be done first?
Start the boiler using the procedure in Objective 3
What is the purpose of having a double block and bleed arrangement when multiple power boilers with manholes are connected to a common steam header?
To protect workers inside boiler drums when the connected header is energized
In which situation is it treated exactly like the warm-up procedure for a single steam boiler plant?
When all the boilers have been shut down
What is the purpose of opening the drain on the non-return valve and slightly opening the header valve for Boiler A during warming up?
To discharge condensate from above the non-return valve and allow steam to flow into the boiler steam line
What is the purpose of step 4 in warming the steam line to Boiler 2?
To open the Boiler 2 non-return valve drain
How can a flow of steam be maintained to keep the steam line warm after it's fully up to pressure and temperature?
Pinching back on the Boiler 2 header block valve drain
In the context of cutting in a boiler with non-return valves, what is the purpose of initially restricting the opening of the non-return valve?
To prevent flow surges and pressure upsets caused by sticking valves
What should be done when the steam line pressure from Boiler 2 equals the steam header pressure, according to Method One for cutting in a boiler?
Slowly open the main header steam block valve
What should be done when the pressure in the boiler steam line and the boiler are approximately equal in a boiler without non-return valves?
Slowly open the main header steam block valve
What should be done if a non-return valve sticks in the closed position?
Partially restrict its opening initially
What is referred to as the base-loaded boiler when multiple boilers are on line and operating in automatic firing mode?
Boiler with lowest pressure
Test your knowledge about steam systems, multiple boilers, and boiler management in high-pressure steam plants. Learn about the process of cutting in a boiler and the function of steam headers in multiple boiler systems.
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