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