Reading...
Play button
Play button
Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
116 Cards in this Set
- Front
- Back
|
the best way to determine when to do a blow down is?
|
water analysis
|
|
|
What can be used to vent a boiler Instead of the steam drum vents?
|
top try cocks
|
|
|
blow down the water column every?
|
once a shift
|
|
|
blow down boiler every?
|
once a day
|
|
|
test safety valves every?
|
30 days
|
|
|
an accumulation test does what?
|
it accumulates steam to the point where safetys lift
|
|
|
safety valves are meant to do what?
|
lift when pressure is to high
|
|
|
safety valves should never exceed (blank) on a high pressure boiler
|
6% MAWP
|
|
|
a boiler operating at 14 PSI is a ________ boiler
|
low pressure
|
|
|
What type of boiler is at more risk to explode?
|
fire tube due to high volume of water in comparison to horse power
|
|
|
cast iron boilers stacked on top the others, like pancakes is called?
|
HCB horizontal section
|
|
|
when you remove combustible gas and replace it with fresh air in a boiler is called?
|
purge
|
|
|
a boiler must be prepurged for at least
|
30 seconds
|
|
|
in a fire tube boiler the water is ?
|
outside the tubes
|
|
|
in a water tub boiler the water is?
|
inside the tubes
|
|
|
to have a safe and efficient boiler you need at least _________ pumps?
|
one steam and one electric feed pump
|
|
|
if you have 500 Sq ft of heating surface you must have?
|
2 blow downs
|
|
|
steam pressure gauge must be mounted at ________ of a boiler.
|
highest part of steamside
|
|
|
What's the best way to protect a steam gauge?
|
install a siphon between gauge and boiler
|
|
|
an evaporation test, tests what on a boiler?
|
it tests the low water fuel cut off
|
|
|
a siphon protects the steam gauge from what?
|
from the high temp of steam
|
|
|
you should only open boiler vents when?
|
filling ,draining,start up, and shutdown
|
|
|
last thing to check when filling a boiler?
|
make sure vents are open
|
|
|
What pressure should you have in a pulverized coal furnace?
|
a negative pressure
|
|
|
pulverized coal is burned in?
|
suspension
|
|
|
the best way to get rid of TDS (total dissolved solids) is?
|
continuous blowdown
|
|
|
What does the fusible plug do for a boiler?
|
it is the last low water alarm
|
|
|
What is the difference between PSIa and PSIg?
|
14.7
|
|
|
how much pressure is a low pressure boiler?
|
under 15 PSI
|
|
|
What is the ASME?
|
American society of mechanical engineering
|
|
|
What is nowl?
|
normal operating water level
|
|
|
What is NOP?
|
normal operating pressure
|
|
|
What is the percentage of oxygen and nitrogen in a boiler?
|
21% oxygen and 79% nitrogen
|
|
|
What is the purpose of a blow down valve?
|
To remove sediment and sludge from the mud drum of the boiler
|
|
|
What is MAWP?
|
maximum allowable working pressure. should not exceed 6%
|
|
|
name three types of stress?
|
compression, tensile, shear
|
|
|
name three ways to transfer heat?
|
Convection, conduction, and radiant
|
|
|
What type of fittings are used on high and low pressure boilers?
|
low pressure, screwed, high pressure, flanged and welded
|
|
|
What is the purpose of pouring water down a floor drain?
|
prevents sewer gas or order from building up
|
|
|
how often should you blow down a boiler?
|
every 24 hours
|
|
|
What are 3 types of refrigerants used in boilers?
|
ammonia, lithium bromide, lithium chloride
|
|
|
What is sensible heat?
|
change in temperature
|
|
|
What is latent heat?
|
a change in state or phase
|
|
|
What is BTU?
|
amount of heat it takes to raise 1 pound of water 1 degree Fahrenheit
|
|
|
What does MATT stand for?
|
mixture, atomization, time, temperature
|
|
|
a high pressure boiler is greater than ______ PSIg and ______ BHP?
|
15 psi , 6 bhp
|
|
|
viscosity is?
|
resistance to flow
|
|
|
What is located on the water column to keep sludge from building inside
|
a blow down valve
|
|
|
when you double the temperature is a gas what happens to the volume
|
it double
|
|
|
What will happen if there is a sudden drop in pressure without a sudden drop in temperature
|
boiler will explode
|
|
|
a microprocessor burner control system will secure the flame on all problems EXCEPT
|
change fuel ratio depending on steam load change (control is only for safe operation)
|
|
|
if I have oxygen, fuel, and release in heat, what other factor is missing
|
temperature (time wasn't option)
|
|
|
positioning control system need what to operate
|
clean, dry air
|
|
|
if you had a screw type and a quick open valve uses for a blowdown, what order are they open
|
quick is always open first and last
|
|
|
why is a positive pressure furnace dangerous
|
because if there are any leaks, it will leak toxic gasses into the boiler room
|
|
|
when looking for pressure in a vacuum, if you have PSIg how do you determine PSIa
|
take atmosphere pressure and subtract PSIg
|
|
|
thermal efficiency is the ratio of heat available versus
|
the ratio of heat absorbed
|
|
|
a safety valve is set on a boilers so that the pressure doesn't exceed ________ MAWP
|
6PSI
|
|
|
during water analysis you search for
|
TDS
|
|
|
how does pure water affect a electrode boiler
|
low conductivity which causes low heat
|
|
|
What is the purpose of the water column
|
to reduce turbulence in the sight glass
|
|
|
if the top valve is clogged on the sight glass
|
water will fill the glass giving a false high level reading that will stay full even if there is no water in the boiler
|
|
|
before opening a hand hole you must
|
open the vent to release any vacuum inside of the boiler
|
|
|
the last thing you do before filling a boiler
|
open the vent
check to make sure no one is inside of the boiler |
|
|
which is true about a steam separator or dry pipe
|
Doesn't add heat
|
|
|
when opening the main steam valves which need to be done
|
open the main valve slowly to prevent a sudden rush of steam
|
|
|
a boiler with 2 safety valves with a max MAWP of 60 psi where is the second one set
|
6 psi above the first (with 2 valves the pressure can't exceed 10%, 10% of 60 is 6)
|
|
|
which don't you do when shutting down a boiler
|
don't close off the main steam stop valve right away
|
|
|
why is the low pressure gas system safer than a high pressure system
|
a manual reset valve won't be able to be reset if there is a flame failure
|
|
|
secondary air is used to
|
control fuel efficiency
|
|
|
balance draft is controlled by the use of
|
outlet dampers
|
|
|
the purpose of a suction valve in a reciprocating compressor is to
|
allow water into the cylinder and prevent if from backing into the suction line
|
|
|
if a water temp of the feed water becomes to high
|
a pump can become steam bound
|
|
|
cavitation causes which problems on a pump
|
vibration/noise
|
|
|
why is a fuel with a low flash point considered dangerous
|
because the fuel oil or vapor could ignite
|
|
|
What is combustion
|
burning all fuel with the theoretic amount of outside air
|
|
|
which is not a benefit of natural gas
|
it needs no air to be used
|
|
|
when inside of a boiler high wattage lines must be plugged into
|
a gfci outlet
|
|
|
which is not a benefit of natural gas
|
it needs no air to be used
|
|
|
which could led to spontaneous combustion
|
oily rags
|
|
|
a cold plant is considered
|
any plant down for more than 2 days
|
|
|
What can be determined by the term a dropped plug
|
means the fusible plugs tin has melted and the tubes are burning
|
|
|
What is oxidation
|
combination of fuel and oxygen without a release in heat
|
|
|
which statement about modulating control is unture
|
It starts the burner in low fire but shuts down in high fire
|
|
|
pressure controllers must be mounted
|
vertically so the sensor is most avcurate
|
|
|
automatic controllers are used in a boiler to
|
maintain a proper steam pressure
|
|
|
microprocessor controls are used only for
|
combustion safety
|
|
|
pneumatic measures
|
the amount of oil in a tank in gallons
|
|
|
smoke meter senses what
|
condition flue gasses are to see if there is proper combustion
|
|
|
are you going to pass this test
|
You better ******* believe it
|
|
|
If you are operating 100 psi or above you must have
|
2 blow downs
|
|
|
aquastat is a waterstat used on
|
hot water boilers
|
|
|
if a boiler failure occurs fuel must shut off within
|
4 seconds
|
|
|
which is safer a cold start or hot start
|
cold start is safer
|
|
|
If operating 100 PSI or above you must have |
2 blowdowns |
|
|
What is hot start |
Is lighting another boiler with steam stops closed |
|
|
Hydrostatic test |
(Bump pressure up to 1 1/2 times MAWP) is done before bringing back online |
|
|
Cold start on a boiler |
Is when everything is cold and steam stops are open |
|
|
Banking |
Is keeping coal burning boilers fans on to keep it warm |
|
|
Spalling |
Is hair line crack in the refactory |
|
|
What do you do if a flame sensor is working properly |
Pull it out and cover it up |
|
|
Filming amines are |
Meant to coat pipes and prevent corrosion |
|
|
Amines are put into a boiler to treat carbon dioxide. |
Carbonic acid |
|
|
What level should a boiler PH range from |
7-10 PH |
|
|
PH level over 7 is considered |
Caustic embrittlement |
|
|
PH level in a boiler lower than 7 is considered |
Acidic |
|
|
When blowing down a boiler the valve open first is |
The one closest to the shell of the boiler, which is also the quick opening valve |
|
|
How arw low pressure boilers vented |
Means of trycocks |
|
|
How often do you check low pressure safety |
Every 30 days |
|
|
Type A fire extinguishers |
Put out on water fires |
|
|
Type b fire extingushers |
Are used on oil fires |
|
|
On low water conditions you must never |
Purge |
|
|
Rotometer |
Is a variable air flow meter |
|
|
What do flow meters look for |
Difference in pressure |
|
|
Smoke meter |
Senses condition of flue gases to see proper combustion |
|
|
Pneumercater |
Measures the amout of oil in a tank in gallons |
