Steam Systems and Multiple Boilers

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

To provide redundancy and additional capacity (correct)

To decrease the thermal capacity

To increase the steam pressure

To reduce the number of steam headers

What condition is the boiler in when it is being brought online?

Hot and at reduced pressure

Hot and at normal operating pressure

Cold and at reduced pressure (correct)

Cold and at normal operating pressure

How are the different steam headers identified in a high-pressure steam plant?

By the pressures at which they operate (correct)

By the equipment they supply steam to

By the size of the pipes they are connected to

By the temperature at which they operate

What can happen if headers and piping are not properly warmed up in a steam plant?

Severe water hammer Signup and view all the answers

In a multiple boiler system, how are the high pressure and intermediate pressure headers connected?

The high pressure header lets down to the intermediate pressure header Signup and view all the answers

What is the purpose of connecting headers in sequence in a multiple boiler system?

To minimize water hammer Signup and view all the answers

When warming the steam line between the header and Boiler 2, what should be done with the Boiler 2 header block valve?

Keep it closed Signup and view all the answers

What should be done with the Boiler 2 non-return valve drain when warming the steam line to Boiler 2?

Open it Signup and view all the answers

What should be done with the header block valve drain when warming the steam line to Boiler 2?

Open it Signup and view all the answers

In what condition should the boiler be operating when cutting in a power boiler into a pressurized steam header?

Manual low-fire mode Signup and view all the answers

When cutting in a boiler with non-return valves, at what point should the non-return valve be slowly opened fully?

When Boiler A is supplying steam Signup and view all the answers

What should be done after opening the header stop valve for Boiler 2 fully?

Shut Boiler 2 non-return drain valve Signup and view all the answers

What should be done when cutting in boilers that do not have non-return valves?

Open the boiler stop valve slowly when pressures are approximately equal Signup and view all the answers

When should the header stop valve be slowly opened fully in boilers that do not have non-return valves?

When the pressure in the boiler steam line equals the header pressure Signup and view all the answers

What is the first step when placing a steam heating boiler on line with other heating boilers that are already in service?

Start the boiler with the supply stop valve and the return stop valve closed Signup and view all the answers

Why should ALL DRAIN VALVES at ALL SYSTEM LOW POINTS be opened when warming high-pressure steam headers in a multiple boiler plant?

To prevent water hammer from occurring Signup and view all the answers

What is the purpose of the double block and bleed arrangement for multiple power boilers with manholes connected to a common steam header?

To protect workers inside boiler drums when the connected header is energized Signup and view all the answers

What is the purpose of the bypass valves located at the header block valves of multiple power boilers feeding a common steam header?

To warm up the steam lines to the boilers for easy maintenance Signup and view all the answers

What should be done to warm the steam line to the header using steam from Boiler 2 when Boiler 2 is being warmed to place it on line with Boiler 1?

Open Boiler 2 non-return valve drain and header block valve drain Signup and view all the answers

When is it considered hazardous to put a relatively short length of pipe into full service without warming it up and drying it out?

When there is an accumulation of condensate within the pipe Signup and view all the answers