1
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Low pressure boiler Questions and
Answers (100% Correct Answers) Already
Graded A+
How do you determine if a boiler has sufficient safety valve
capacity [ ANS: ] The accumulation test determines if the valve will
discharge all the steam pressure, without allowing the pressure to
rise more than 6% more than valve setpoint
If a safety valve opens at 100 psi, what pressure should it close at?
© 2025 Assignment Expert
What requirements governors safety valve blowdowns? [ ANS: ] A:
96-98 psi, with no chatter, with a blowdown of no more than 4 psi
of set pressure.
Guru01 - Stuvia
A safety valve is limited to how many square ft of heating surface.
[ ANS: ] Any boiler with more than 500 sq ft must have two or more
safety valves
What is a safety valve and how does it operate [ ANS: ] Is a device
that expels all excess steam pressure from a boiler. The huddling
chamber causes the valve to open fully causing a definite drop in
pressure before closing.
What type of stays are used in a the heads of a water tube boiler [
ANS: ] No stays, the head of the boiler drum is shaped with a die,
which would form them in the shape they would take when
pressure is applied.
Your fuel oil tank capacity is 20,000 and you have 10,000 left. How
much do you order? [ ANS: ] 8,000 gallons. Fuel tanks cannot be
filled past 90% because of overfill protection.
Why are handhelds and manholes made oval instead of round.
What are minimum sizes for both openings? [ ANS: ] So they can
be removed and inserted from respective openings in the boiler.
Manhole 11X5 or 10 X 16 handheld 2 3/4 X 3 1/2
, 2
For Expert help and assignment solutions, +254707240657
What is thermal efficiency? What is a good percentage? [ ANS: ] It
is the ratio of heat supplied by the fuel to the heat absorbed by
the boiler. 85%
How do you determine boiler capacity and what is boiler heating
surface [ ANS: ] Total heating surface determines the capacity of
the boiler. Heating surface on one side and boiler water on the
other. Measures from the fire side.
What is the furnace volume? Is furnace volume measured in? [
ANS: ] Furnace volume is the space available for complete
combustion of the fuel before the products of combustion enter
© 2025 Assignment Expert
he heating absorbing section of the boiler. This varies with the type
of fuel used. Measure in cubic ft
How is a blowdown tank piped, how does it work and why isn't
any pipe directly connected to sewer [ ANS: ] The blowdown
Guru01 - Stuvia
enters in the tank above the waterline, maintained in the tank
against a splash guard. There is a vent on the top of the tank to
prevent back pressure. The tank tank dischArge line is also vented
to prevent siphoning. The tank has a drain valve and a manhole
for cleaning. The discharge line is opposite the inlet, resulting in the
cooler water being discharged first. Flash steam and or hot water
directly into the sewer may injure people or damage sewer line.
What is a plug valve. And why is it used on blow down lines. [ ANS:
] A plug valve has a circular tapered plug ground to fit into there
valve body. There is a hole through the plug that aligns with the
valve body when open. When turned closed the holes are
misaligned. The shearing action cuts thru scale and will not fall
open.
What is a slow opening valve [ ANS: ] It is a screw type that
requires at least five full turns from closed to open.
Where is the bottom blowdown pipe connected to an HRT boiler?
What type valves are used on the bottom blowdown and in what
, 3
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order are they placed? How should you blowdown a boiler using
those valves? What size blowdown pipe? [ ANS: ] Underside of the
shell, at the rear of the boiler
Two slow opening, or one quick and one slow opening valve
Quick valve is installed next to the boiler, opened first closed last.
Size 1 inch, not greater than 2 1/2. 3/4 is allowed on boiler less than
100sq ft
When is the best time to blowdown a boiler, what important safety
procedure do you observe [ ANS: ] During light loads, sludge has
© 2025 Assignment Expert
settled to bottom.
Blowdown 10 seconds,
Once you open the valve do not take your hand off until valve is
Guru01 - Stuvia
closed
How should a continuous blowdown be piped as it leaves the
boiler and why? [ ANS: ] It will be piped through a heats
exchanger or flash tank to recover the heat. Then onto the
blowdown tank
What is a continuous blowdown system and where is it installed [
ANS: ] Based on water analysis the surface blowdown is monitored
for continuous flow. The take off is located just below the NOWL in
the steam and water drum
What is a surface blow off? Where is it employed and why used [
ANS: ] Remove oil continents form the surface of boiler water. The
take off is located in the top 3" or 4" of water it controls the TDS
total dissolved solids.
On a Ashton type safety valve the label "O" and "S", what stand for
and what adjustments can be made [ ANS: ] Open And shut. Not
certified to make adjustments
, 4
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A boiler designed to operate at 125psi, know operates at 15 psi.
What changes need to be made.? [ ANS: ] Permanent change,
safety valve larger disk and lower pressure rating with need to be
installed
How do you determine if a boiler has sufficient safety valve
capacity [ ANS: ] Accumulation test will determine if the boiler
discharges pressure, not allow pressure to build over 6% if MAWP
How must a safety valve be connected to a boiler [ ANS: ] 1.
Independent of any other steam connection
2. Close as possible without any other piping
© 2025 Assignment Expert
3. Screwed into the boiler shell or fastened to a flange welded to
the shell
Guru01 - Stuvia
4. Connected to stand upright
5. Vent must be fastened to bldg. not connected to valve
At what temperature does a safety valve on a superheater have
to be protected with heat resisting material? [ ANS: ] 450 F
W
How do you regulate the blowdown of a safety valve [ ANS: ] The
blowdown is adjusted by adjusting the blowback ring, and or
spring 10%. Only license and trained people should make
adjustments
How often is it recommended to test your safety valves manually
and how often underpressure [ ANS: ] 30 days manually, 1 yr
underpressure
How is a superheater protected [ ANS: ] Each superheat must
have one or more safety valves near outlet with pressure set
below those on the boiler insuring a constant flow of steam
through the superheater.
For Expert help and assignment solutions, +254707240657
Low pressure boiler Questions and
Answers (100% Correct Answers) Already
Graded A+
How do you determine if a boiler has sufficient safety valve
capacity [ ANS: ] The accumulation test determines if the valve will
discharge all the steam pressure, without allowing the pressure to
rise more than 6% more than valve setpoint
If a safety valve opens at 100 psi, what pressure should it close at?
© 2025 Assignment Expert
What requirements governors safety valve blowdowns? [ ANS: ] A:
96-98 psi, with no chatter, with a blowdown of no more than 4 psi
of set pressure.
Guru01 - Stuvia
A safety valve is limited to how many square ft of heating surface.
[ ANS: ] Any boiler with more than 500 sq ft must have two or more
safety valves
What is a safety valve and how does it operate [ ANS: ] Is a device
that expels all excess steam pressure from a boiler. The huddling
chamber causes the valve to open fully causing a definite drop in
pressure before closing.
What type of stays are used in a the heads of a water tube boiler [
ANS: ] No stays, the head of the boiler drum is shaped with a die,
which would form them in the shape they would take when
pressure is applied.
Your fuel oil tank capacity is 20,000 and you have 10,000 left. How
much do you order? [ ANS: ] 8,000 gallons. Fuel tanks cannot be
filled past 90% because of overfill protection.
Why are handhelds and manholes made oval instead of round.
What are minimum sizes for both openings? [ ANS: ] So they can
be removed and inserted from respective openings in the boiler.
Manhole 11X5 or 10 X 16 handheld 2 3/4 X 3 1/2
, 2
For Expert help and assignment solutions, +254707240657
What is thermal efficiency? What is a good percentage? [ ANS: ] It
is the ratio of heat supplied by the fuel to the heat absorbed by
the boiler. 85%
How do you determine boiler capacity and what is boiler heating
surface [ ANS: ] Total heating surface determines the capacity of
the boiler. Heating surface on one side and boiler water on the
other. Measures from the fire side.
What is the furnace volume? Is furnace volume measured in? [
ANS: ] Furnace volume is the space available for complete
combustion of the fuel before the products of combustion enter
© 2025 Assignment Expert
he heating absorbing section of the boiler. This varies with the type
of fuel used. Measure in cubic ft
How is a blowdown tank piped, how does it work and why isn't
any pipe directly connected to sewer [ ANS: ] The blowdown
Guru01 - Stuvia
enters in the tank above the waterline, maintained in the tank
against a splash guard. There is a vent on the top of the tank to
prevent back pressure. The tank tank dischArge line is also vented
to prevent siphoning. The tank has a drain valve and a manhole
for cleaning. The discharge line is opposite the inlet, resulting in the
cooler water being discharged first. Flash steam and or hot water
directly into the sewer may injure people or damage sewer line.
What is a plug valve. And why is it used on blow down lines. [ ANS:
] A plug valve has a circular tapered plug ground to fit into there
valve body. There is a hole through the plug that aligns with the
valve body when open. When turned closed the holes are
misaligned. The shearing action cuts thru scale and will not fall
open.
What is a slow opening valve [ ANS: ] It is a screw type that
requires at least five full turns from closed to open.
Where is the bottom blowdown pipe connected to an HRT boiler?
What type valves are used on the bottom blowdown and in what
, 3
For Expert help and assignment solutions, +254707240657
order are they placed? How should you blowdown a boiler using
those valves? What size blowdown pipe? [ ANS: ] Underside of the
shell, at the rear of the boiler
Two slow opening, or one quick and one slow opening valve
Quick valve is installed next to the boiler, opened first closed last.
Size 1 inch, not greater than 2 1/2. 3/4 is allowed on boiler less than
100sq ft
When is the best time to blowdown a boiler, what important safety
procedure do you observe [ ANS: ] During light loads, sludge has
© 2025 Assignment Expert
settled to bottom.
Blowdown 10 seconds,
Once you open the valve do not take your hand off until valve is
Guru01 - Stuvia
closed
How should a continuous blowdown be piped as it leaves the
boiler and why? [ ANS: ] It will be piped through a heats
exchanger or flash tank to recover the heat. Then onto the
blowdown tank
What is a continuous blowdown system and where is it installed [
ANS: ] Based on water analysis the surface blowdown is monitored
for continuous flow. The take off is located just below the NOWL in
the steam and water drum
What is a surface blow off? Where is it employed and why used [
ANS: ] Remove oil continents form the surface of boiler water. The
take off is located in the top 3" or 4" of water it controls the TDS
total dissolved solids.
On a Ashton type safety valve the label "O" and "S", what stand for
and what adjustments can be made [ ANS: ] Open And shut. Not
certified to make adjustments
, 4
For Expert help and assignment solutions, +254707240657
A boiler designed to operate at 125psi, know operates at 15 psi.
What changes need to be made.? [ ANS: ] Permanent change,
safety valve larger disk and lower pressure rating with need to be
installed
How do you determine if a boiler has sufficient safety valve
capacity [ ANS: ] Accumulation test will determine if the boiler
discharges pressure, not allow pressure to build over 6% if MAWP
How must a safety valve be connected to a boiler [ ANS: ] 1.
Independent of any other steam connection
2. Close as possible without any other piping
© 2025 Assignment Expert
3. Screwed into the boiler shell or fastened to a flange welded to
the shell
Guru01 - Stuvia
4. Connected to stand upright
5. Vent must be fastened to bldg. not connected to valve
At what temperature does a safety valve on a superheater have
to be protected with heat resisting material? [ ANS: ] 450 F
W
How do you regulate the blowdown of a safety valve [ ANS: ] The
blowdown is adjusted by adjusting the blowback ring, and or
spring 10%. Only license and trained people should make
adjustments
How often is it recommended to test your safety valves manually
and how often underpressure [ ANS: ] 30 days manually, 1 yr
underpressure
How is a superheater protected [ ANS: ] Each superheat must
have one or more safety valves near outlet with pressure set
below those on the boiler insuring a constant flow of steam
through the superheater.
