Steam Systems and Boiler Management

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What is the purpose of having multiple boilers in larger steam systems?

To decrease the thermal capacity

To reduce the pressure in the steam headers

To ensure additional capacity is available on standby (correct)

To increase the overall heating efficiency

In a high-pressure steam plant, how are the headers identified?

By the temperature at which they operate

By the pressures at which they operate (correct)

By the steam flow rate through them

By the materials used in their construction

What could happen if the headers are not properly warmed up in a steam system?

Severe water hammer occurrence (correct)

Increased heating efficiency

Reduced condensate formation

Improved boiler firing from cold

Why do headers and the piping need to be properly warmed up in steam systems?

To decrease thermal stress (D) Signup and view all the answers

How are the different headers connected in sequence in a steam system?

The high pressure header lets down to the low pressure header (A) Signup and view all the answers

What is the purpose of having a 2500 kPa header in a high-pressure steam plant?

For intermediate pressure turbines and processes (A) Signup and view all the answers

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 (B) Signup and view all the answers

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 (A) Signup and view all the answers

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 (A) Signup and view all the answers

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 (B) Signup and view all the answers

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 (D) Signup and view all the answers

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 (D) Signup and view all the answers

What is the purpose of step 4 in warming the steam line to Boiler 2?

To open the Boiler 2 non-return valve drain (C) Signup and view all the answers

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 (B) Signup and view all the answers

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 (C) Signup and view all the answers

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 (A) Signup and view all the answers

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 (D) Signup and view all the answers

What should be done if a non-return valve sticks in the closed position?

Partially restrict its opening initially (B) Signup and view all the answers

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 (B) Signup and view all the answers