2 A3 POWER ENGINEERING
QUESTIONS AND 100% VERIFIED
ANSWERS /GRADE A
u1 boiler HP equals how many kilowatts? - 9.809 kW
Boiler Definition? - The exact part of the unit where waters changes from liquid to vapour state
Steam Generator Definition? - Embraces the many combinations of heating surfaces such as waterwalls,
superheaters, reheaters, economizers and air heaters.
Steam Generating Unit definition? - Consists of a steam generator and all of its associated equipment
including: fuel burning, ash removal and draft systems.
2 ways of attaching boiler tubes to drums/headers? - - Welding into place
- Expanding into place using an "expander" tool
What is Top Dryness? - - Top dryness is the percentage of steam by mass in the steam water mixture at
the top of a riser tube where heating ceases
- Usually runs from about 5%-20%
- A film of steam is created at the top of riser tubes when top dryness becomes excessive. Adequate
cooling of tubes is not achieved
What is the Boiler Casing? - - The airtight covering forming the outer layer of the boiler constructed of
steel plate
- Areas include: outer skin covering water walls, windbox and burner ducting, ducting enclosing the
economizer, and air heater
- Expansion joints must be joined between the boiler pressure parts and casing because of temperature
differential. (varying expansion rates)
,The boiler casing is part of the boiler setting. True or False? - True
List the sections (in order) of a Once through Boiler. - Feed water inlet, Economizer, Radiant Evaporator
section, Final Evaporator Section, Convection Superheater Section, Radiant Superheater Section, Steam
outlet.
What controls the flow to the individual generating tubes in a controlled circulation boiler? - Orifices in
an inlet header equally distribute feed water to radiant/convection sections in a controlled circulation
boiler.
Purpose of screen tubes? - - Receive radiant heat from the furnace as well as convective heat from flue
gas passing through
- Act to protect the inlet tubes of the superheater from excessive radiant heat
- Also slightly reduce the temperature of the gases exiting the furnace
- Screen tubes are completely filled with water and can extend from the boiler generating bank
Boiler Division Walls? - - Usually made of airtight all-welded membrane construction
- Separate zones of the boiler, for example the convection and radiant zones
What is Steam Flooding? - - A technique used in the oil and gas industry to recover high viscosity crude
oils or bitumen
- At room temperature bitumen is like molasses
- Steam flooding allows the maximum amount of heat to enter the well with the minimum amount of
injected fluid
- Target temperature is 178 degrees celsius
Oil sands and SAGD's? - - Oil Sands: Naturally occurring mixtures of bitumen, water, sand and clay that
are found in 3 areas of Alberta: Athabasca, Peace River and Cold Lake
- Typical oil sand samples hold around 12% bitumen by weight
- 2 Horizontal wells must exist to employ SAGD means of recovery.
Steam Flood Boilers? - - Forced circulation steam generators with a single pass or once through coil
, - Steam quality is usually 75%-80% Steam/Water quality
- This wet steam condition keeps all salts entrained in the feed water and deposits will not collect on
evaporative tube sections
- No steam drum
- Outputs range from 5 million kj/hr to 125 million kj/hr.
Water Sterilization? - - Complete removal of all life forms from the water
Water Disinfection? - - Most common method of water purification for potable water use
- Removes all pathogenic (disease-causing) organisms in the water
Coliform Bacteria? - - Some are harmless or beneficial but some are very dangerous such as fecal
coliform bacteria which cause intestinal illnesses in humans
Canadian Regulatory Standards for Coliform Bacteria? - - No sample can contain more than 10 coliform
per 100 ml
- No consecutive sample from the same site can contain any coliform
- No more than 10% of samples in a minimum group of 10 samples should contain any coliform in a
calendar month
Any traces of E. coli coliform are unacceptable. True or False? - True
Common free chlorine residual for potable water? - 0.3 mg/l residual
Chlorine Demand? - - The point at which an reducing agents are eliminated by a certain amount of
chlorine addition
- The point where all chloro-organic compounds are eliminated
- The point where all chloramines are eliminated by oxidation
Combined available Chlorine? - - Can be determined by conducting a orthotolidine test and getting a
combined available residual
QUESTIONS AND 100% VERIFIED
ANSWERS /GRADE A
u1 boiler HP equals how many kilowatts? - 9.809 kW
Boiler Definition? - The exact part of the unit where waters changes from liquid to vapour state
Steam Generator Definition? - Embraces the many combinations of heating surfaces such as waterwalls,
superheaters, reheaters, economizers and air heaters.
Steam Generating Unit definition? - Consists of a steam generator and all of its associated equipment
including: fuel burning, ash removal and draft systems.
2 ways of attaching boiler tubes to drums/headers? - - Welding into place
- Expanding into place using an "expander" tool
What is Top Dryness? - - Top dryness is the percentage of steam by mass in the steam water mixture at
the top of a riser tube where heating ceases
- Usually runs from about 5%-20%
- A film of steam is created at the top of riser tubes when top dryness becomes excessive. Adequate
cooling of tubes is not achieved
What is the Boiler Casing? - - The airtight covering forming the outer layer of the boiler constructed of
steel plate
- Areas include: outer skin covering water walls, windbox and burner ducting, ducting enclosing the
economizer, and air heater
- Expansion joints must be joined between the boiler pressure parts and casing because of temperature
differential. (varying expansion rates)
,The boiler casing is part of the boiler setting. True or False? - True
List the sections (in order) of a Once through Boiler. - Feed water inlet, Economizer, Radiant Evaporator
section, Final Evaporator Section, Convection Superheater Section, Radiant Superheater Section, Steam
outlet.
What controls the flow to the individual generating tubes in a controlled circulation boiler? - Orifices in
an inlet header equally distribute feed water to radiant/convection sections in a controlled circulation
boiler.
Purpose of screen tubes? - - Receive radiant heat from the furnace as well as convective heat from flue
gas passing through
- Act to protect the inlet tubes of the superheater from excessive radiant heat
- Also slightly reduce the temperature of the gases exiting the furnace
- Screen tubes are completely filled with water and can extend from the boiler generating bank
Boiler Division Walls? - - Usually made of airtight all-welded membrane construction
- Separate zones of the boiler, for example the convection and radiant zones
What is Steam Flooding? - - A technique used in the oil and gas industry to recover high viscosity crude
oils or bitumen
- At room temperature bitumen is like molasses
- Steam flooding allows the maximum amount of heat to enter the well with the minimum amount of
injected fluid
- Target temperature is 178 degrees celsius
Oil sands and SAGD's? - - Oil Sands: Naturally occurring mixtures of bitumen, water, sand and clay that
are found in 3 areas of Alberta: Athabasca, Peace River and Cold Lake
- Typical oil sand samples hold around 12% bitumen by weight
- 2 Horizontal wells must exist to employ SAGD means of recovery.
Steam Flood Boilers? - - Forced circulation steam generators with a single pass or once through coil
, - Steam quality is usually 75%-80% Steam/Water quality
- This wet steam condition keeps all salts entrained in the feed water and deposits will not collect on
evaporative tube sections
- No steam drum
- Outputs range from 5 million kj/hr to 125 million kj/hr.
Water Sterilization? - - Complete removal of all life forms from the water
Water Disinfection? - - Most common method of water purification for potable water use
- Removes all pathogenic (disease-causing) organisms in the water
Coliform Bacteria? - - Some are harmless or beneficial but some are very dangerous such as fecal
coliform bacteria which cause intestinal illnesses in humans
Canadian Regulatory Standards for Coliform Bacteria? - - No sample can contain more than 10 coliform
per 100 ml
- No consecutive sample from the same site can contain any coliform
- No more than 10% of samples in a minimum group of 10 samples should contain any coliform in a
calendar month
Any traces of E. coli coliform are unacceptable. True or False? - True
Common free chlorine residual for potable water? - 0.3 mg/l residual
Chlorine Demand? - - The point at which an reducing agents are eliminated by a certain amount of
chlorine addition
- The point where all chloro-organic compounds are eliminated
- The point where all chloramines are eliminated by oxidation
Combined available Chlorine? - - Can be determined by conducting a orthotolidine test and getting a
combined available residual
