Theory 2 on Power Plant Exam Study with
Questions & Answers Graded A+
When preparing to start any type of boiler plant, what are a number of
auxiliaries that must be proven operational before proceeding?
All boiler plants have
- Feedwater
- Fuel
- Combustion air systems
The success of starting up a plant depends on what?
the amount of preparation you have done, such as lining up the feedwater deliver
system before you start the boiler, rather than finding out the pump doesn't work...
right when you need it
What the 2 Classifications of pumps are?
Dynamic and Positive Displacement
What is considered a dynamic pump?
Centrifugal
What is considered Positive displacement?
Reciprocating and Rotary
A positive displacement pump should not operate against a closed valve on the
discharge side of the pump. Why?
because a positive displacement pump operating against a closed discharge valve
continues to produce flow and the pressure in the discharge line increases until the
piping bursts, the pump is damaged or both
, True of False
A relief or safety valve on the discharge side will damage the flow of air to the
machinery
False.
A relief or safety valve on the discharge side of the positive displacement pump is,
therefore, necessary
Why do we start a centrifugal pump with the discharge closed?
By closing the discharge valve, the starting current can be reduced also you prime
the pump
Confirm the readiness of the feedwater system.
1. Line up valves
2. Ensure bypass is closed
3. Feedwater pre treatment lined up(chemicals, softeners)
4. Confirm sufficient make up waterlevels
5. Deaerator level is good
6. Ensure feedwater pumps are inservice (MCC)
7. Confirm boiler water level
What can the feedwater walk down may involve?
- Chemical pumps are ready for service, chemicals added as required.
- All water levels in tanks up to setpoints
- Makeup, or treated water is in service
- Pumps operating, including minimum flow valves open (to protect centrifugal
pumps) for deaerator, softener, condensate tank and feeding water (feedwater) to
the boiler
Describe the Walk Down for Natural Gas
1. Verify all necessary valves, such as the pilot and main fuel supply are open
2. Verify gas is correct pressure
Questions & Answers Graded A+
When preparing to start any type of boiler plant, what are a number of
auxiliaries that must be proven operational before proceeding?
All boiler plants have
- Feedwater
- Fuel
- Combustion air systems
The success of starting up a plant depends on what?
the amount of preparation you have done, such as lining up the feedwater deliver
system before you start the boiler, rather than finding out the pump doesn't work...
right when you need it
What the 2 Classifications of pumps are?
Dynamic and Positive Displacement
What is considered a dynamic pump?
Centrifugal
What is considered Positive displacement?
Reciprocating and Rotary
A positive displacement pump should not operate against a closed valve on the
discharge side of the pump. Why?
because a positive displacement pump operating against a closed discharge valve
continues to produce flow and the pressure in the discharge line increases until the
piping bursts, the pump is damaged or both
, True of False
A relief or safety valve on the discharge side will damage the flow of air to the
machinery
False.
A relief or safety valve on the discharge side of the positive displacement pump is,
therefore, necessary
Why do we start a centrifugal pump with the discharge closed?
By closing the discharge valve, the starting current can be reduced also you prime
the pump
Confirm the readiness of the feedwater system.
1. Line up valves
2. Ensure bypass is closed
3. Feedwater pre treatment lined up(chemicals, softeners)
4. Confirm sufficient make up waterlevels
5. Deaerator level is good
6. Ensure feedwater pumps are inservice (MCC)
7. Confirm boiler water level
What can the feedwater walk down may involve?
- Chemical pumps are ready for service, chemicals added as required.
- All water levels in tanks up to setpoints
- Makeup, or treated water is in service
- Pumps operating, including minimum flow valves open (to protect centrifugal
pumps) for deaerator, softener, condensate tank and feeding water (feedwater) to
the boiler
Describe the Walk Down for Natural Gas
1. Verify all necessary valves, such as the pilot and main fuel supply are open
2. Verify gas is correct pressure
