20 Questions
What is the purpose of having multiple boilers in larger steam systems?
To provide redundancy and additional capacity
What condition is the boiler in when it is being brought online?
Cold and at reduced pressure
How are the different steam headers identified in a high-pressure steam plant?
By the pressures at which they operate
What can happen if headers and piping are not properly warmed up in a steam plant?
Severe water hammer
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
What is the purpose of connecting headers in sequence in a multiple boiler system?
To minimize water hammer
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
What should be done with the Boiler 2 non-return valve drain when warming the steam line to Boiler 2?
Open it
What should be done with the header block valve drain when warming the steam line to Boiler 2?
Open it
In what condition should the boiler be operating when cutting in a power boiler into a pressurized steam header?
Manual low-fire mode
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
What should be done after opening the header stop valve for Boiler 2 fully?
Shut Boiler 2 non-return drain valve
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
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
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
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
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
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
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
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
Test your knowledge about steam systems with multiple boilers, including the process of cutting in a boiler and the function of steam headers in such systems.
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