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HPB Quizzes

HPB quizzes

QuestionAnswer
In conduction the transfer of heat from one material to another occurs due to direct _________. contact
_________ is the transfer of heat by the circulation of a liquid or gas flowing over the surface of a body. convection
When a pump is used to circulate water through a heating system it is a _________ _________ system. forced convection
One boiler horsepower equals ______ lbs.steam/hr. 34.5 lbs.steam/hr.
The flow of heat through electromagnetic waves is known as _________. radiation
The temperature of a liquid minus 32 is the _________ of the liquid. enthalpy
Formula for Total Force (TF). TF=P*A TF=lbs. P=psi A=sq.units
_________ _________ is the pressure applied to an object due to the gravitational attraction of the earth. Atmospheric pressure
_________ _________ is the sum of the gauge pressure and atmospheric pressure. Absolute pressure
_________ _________ _________ is the amount of heat required to raise the temperature of 1 lb. of water 1°F at 59°F. British Thermal Unit
Heat necessary to change 1 pound of a substance from a liquid to a gas at a constant temperature is _________ _________ ___ _________. latent heat of evaporation
_________ _________ is the temperature at which all molecular motion ceases. It is the absence of all heat. Absolute zero
Circle formulas: d? C? A? d=2r C=d*pi or d*3.14 A=d*d*.7854
Volume of a cylinder? V=d*d*.7854*L
How many cu.in. in a gallon? 231 g=cu.in./231
Given the L and W of a sqare duct, what is the formula to find the diameter of an equally sized round duct? d=sq.rt.(l*w/.7854)
A power boiler is a steam boiler that operates at pressures greater than ______ psi, or a hot water boiler that operates above ______ or ______. 15 psi 160 psi 250°F
A supercritical boiler is a boiler that operates in excess of ______ or ______. 3206 psia 705°F
One boiler horsepower equals how many btu's? 33,475 btu's
The maximum allowable voltage on a control circuit is ______. 150 volts
In order to permit the water in a hot water heating system to expand without a corresponding increase in pressure, an _________ _________ must be used. expansion tank
Pressure relief valve on a hot water boiler must be at least ______ diameter and not more than ______. 3/4" 4-1/2"
A low pressure boiler must have an ASME ______ stamp. H
The National Board of Boiler and Pressure Vessel Repair require an ASME ______ stamp for companies that repair boilers. R
Water hammer is caused by the quickly opening a _________ _________. steam valve
The ratio of the boiler's heat output to it's heat input is _________ _________. boiler efficiency
In _________ boilers, the water passes through tubes, and the products of combustion pass around the tubes. watertube
°C to °F °F=(°C*1.8)+32
°F to °C °C=(°F-32)/1.8
°F to °R °R=°F+460
°C to °K °K=°C+273
Formula for absolute pressure? psia=gauge psi + 14.7
_________ prevents the tube ends from being overheated and being burnt off. beading
A throug stay differs from a diagonal stay in that it runs the _________ _________ of the boiler. entire length
The Economic boiler was an improvement on the HRT boiler. The economic boiler has more _________ _________ per square foot of floor space, it requires less _________ , and is easier to _________ as a single packaged unit. heating surface brickwork ship
A drypipe on a scotch marine boiler is used to remove _________ from the steam prior to leaving the boiler. moisture
A _________ drum below the rear headers was used to collect sediment and was blown down from time to time. mud
A _________ _________ is constructed of flat plates, referred to as a tube sheet and tube cap sheet. box header
Sulfur in the soot then unites with moisture from condensation to produce a _________ _________. sulfuric acid
Welding a flat strip of metal between the waterwall tubes is known as _________ wall construction. membrane
_________ consist of relatively close spaced vertical tubes forming the four walls of the furnace. These tubes help to protect the refractory of the boiler. Waterwalls
On HRT boilers, the shell is pitched 1 to 2 inches towards the back of the boiler to produce a more effective _________ _________ of the boiler. bottom blowdown
_________ is the transfer of heat from a liquid (or gas) flowing over the surface of a body. convection
_________ _________ is caused by the difference in density of a liquid due to a difference in temperature. natural convection
Because the shell of the HRT is exposed to the fire, it requires careful _________ _________ for scale, bulging, and blisters. interior inspection
The ratio of the maximum fuel input rate and the minimum fuel input rate is known as the _________ _________. turn-down ratio
The accumulation of _________ on the waterside of the boiler leads to overheating and possible sagging and loosening in the tubesheet. scale
Name three places internal corrosion occurs in a vertical boiler. 1) around main feedwater inlet 2) on tubes at NOWL 3) top of lower tubesheet
Prior to entering a confined space, the minimum amount of oxygen in the space ______ percent. 19%
The operation of a black liquor boiler is known for its _________ _________, and recovery of _________ _________. steam generation soda ash
Cogeneration plants sell _________ to local industrial plants and _________ to the local utility. steam electricity
_________ _________ boilers recover the heat in exhaust from gas turbine to produce useful steam. Waste Heat
A temperature sensor that measure the resistance of a platinum wire at different temperatures is a _________ _________ _________. resistance temperature detector (RTD)
The last form of over-pressure protection on the boiler, prior to lifting the safety valve is the _________ _________ _________. high limit control
The blowdown valve closest to the boiler is _________ first and _________ last. opened first and closed last
The minimum size piping between the boiler and water column is _____. 1"
The safety valve capacity must be sufficient to relieve all the steam that the boiler can generate at the _________ _________ _________ without allowing the pressure to rise more that ______ percent above the Maximum Allowable Working Pressure. maximum firing rate 6%
Two or more safety valves are required on a boiler with a heating surface in excess of ______ square feet or electric input of ______ KW. 500 500
The accumulation of carbon dioxide in the condensate system produces _________ _________, which attacks and corrodes the steam metal piping. carbonic acid
A three element feedwater regulator senses _________ _________, _________ _________, and _________ _________. water level feedwater flow steam flow
Formula for actual boiler pressure when drum is located above gauge. AP=GP-(EW/2.31) AP= actual pressure GP=gauge pressure EW=effective water leg, height in feet
Formulas for Pressure reducing and bypass lines. 1/3 * OC * VSPA and 1/2 * OC * BPA use laregest of the two OC, VSPA, and BPA are found in chart
_________ _________ is the height in feet of the fluid above a designated gauge point. static head
_________ _________ is the static head plus the gauge pressure expressed in feet plus the friction head(if the fluid is flowing) Pressure head
_________ _________ is the vertical height or feet required to produce a certain speed of flow. Expressed by what formula? velocity head v=.4085(gpm)/d²
_________ _________ is the difference between the suction head and the discharge head. Its a measure of the work done by the pump. total head
1 foot of head = how many psi? 1 psig = how many ft. of water 1 foot of head = .433 psi 1 psig = 2.31 ft. of water
A _________ _________ is a check valve located at the bottom of the suction pipe that prevents the water from leaking out and maintains the priming of the pump. foot valve
Pump horsepower 1 PHp = ___ sec.? ___ min.? 1 hp = 550 ft-lbs/sec 1 hp = 33,000 ft-lbs/min
Formula for pump horsepower? HP=GPM*8.33*height*SG/33,000*eff.
GPM flow formula? GPM=v*d²/.4085
5 classifications of pumps? 1) reciprocating 2) rotary 3) centrifugal 4) propeller 5) jet
GPM capacity formula? GPM=LANE/231 L=length of stroke A=area of water cylinder N=# strokes/min (duplex=*2) E=efficiency
Maximum developed pressure formula? MP=steam P*A/ water A
Water at it's boiling point is considered a _________ liquid. saturated
The ratio of the boiler's heat output to it's heat input is _________ _________. boiler efficiency
A power boiler is a steam boiler that operates at pressures greater than ______ psi, or a hot water boiler that operates above _________ or _________. 15 psi 160 psi 250°F
A supercritical boiler is a boiler that operates in excess of _________ or _________. 3206 psi 705°F
A boiler horsepower is the evaporation into dry saturated steam of _________ pounds per hour from and at 212°F. 34.5 lbs./hr. = 1 bhp
_________ btu's per hour output is one boiler horsepower. 33,475 btu/hr = 1 bhp
The maximum voltage allowable on a control circuit is _________ volts. 150 volts
A low pressure steam boiler must have and ASME ______ stamp. H
_________ prevents the tube ends from being overheated and being burnt off. Beading
A through stay differs from a diagonal stay in that it runs the _________ _________ of the boiler. entire length
The minimum size of the blowdown line is ______ inch, and the maximum size is ______ inches. 3/4" 2-1/2"
The accumulation of _________ on the waterside of the boiler leads to overheating and possible sagging and loosening of the tubesheet. scale
In conduction, the transfer of heat from one material to another occurs due to direct _________. contact
_________ is the transfer of heat from a liquid flowing over the surface of a body. Convection
When a pump is used to circulate water through a heating system it is a _________ _________ system. forced convection
The flow of heat through electromagnetic waves is known as _________. radiation
A power boiler is a steam boiler that operates at pressures greater than ______ psi, or a hot water boiler that operates above _________ or _________. 15 160 psi 250°F
A supercritical boiler is a boiler that operates in excess of _________ or _________. 3206 psi 705°F
The maximum voltage allowable on a control circuit is ______ volts. 150
Pressure relief valve on a hot water boiler must be at least _________ diameter and not more than _________. 3/4" 4-1/2"
The minimum size blowdown line is _________ and the maximum size is _________. 3/4" 2-1/2"
Sulfur in the soot unites with moisture from condensation to produce _________ _________. sulfuric acid
Welding a flat strip of metal between the waterwall tubes is known as _________ wall construction. membrane
The ratio of the boiler's heat output to it's heat input is _________ _________. boiler efficiency
A boiler horsepower is the evaporation of _________ pounds per hour from and at 212°F. 34.5
_________ btu's per hour output is one boiler horsepower. 33,475
The operation of a black liquor boiler is known for it's _________ _________, and recovery of _________ _________. steam generation soda ash
The minimum size piping between the boiler and the water column is _________. 1/2"
The device that allows for greater surface area for steam to act upon, thus creating a popping action is called a _________ _________. huddling chamber
In lieu of a stop valve a _________ _________ may be used instead of the stop valve _________ to the boiler. non-return valve closest
A slow opening blowdown valve must complete _______ turns between full open and full shut. 5
The accumulation of carbon dioxide in the condensate system produces _________ _________, which attacks and corrodes steam metal piping. carbonic acid
A three element feedwater regulator senses _________ _________, _________ _________, and _________ _________. water level feedwater flow steam flow
What is the total force acting on a 4" pressure relief valve with a popping pressure of 1200 psi? TF = P * A TF = 1200 * 4 * 4 * .7854 TF = 15079.68 lbs.
The two types of electric boilers are _________ and _________. resistance electrode
When the boiler steam pressure reaches set point of the main scale of the operating control, the burner will turn _________. off
The modulator controls the _________ _________ of the burner. firing rate
The last form of over-pressure protection on the boiler, prior to lifting the safety valve is the _________ _________ _________. high limit control
Steam atomization typically consumes about ______ percent of the steam produced by the boiler. 2%
The lowest temperature at which fuel oil will flow is the _________ _________. pour point
_________ _________ is the temperature at which fuel oil will give off a vapor that will ignite when exposed to open flame. Flash point
The temperature at which fuel oil will give off a vapor that will burn continuously once it has been ignited is the _________ _________. fire point
_________ is the amount of pressure below the setpoint that must be relieved before the safety valve closes. Blowback
Too much _________ causes dense, white smoke. air
The flow rate, in gallons per minute, through a 2-1/2" pipe with a velocity of 7 feet per second is _________ gpm. gpm=v*d*d/.4085 gpm=7*2.5*2.5/.4085 107.1 gpm
A 12" pipe filled with water 275 feet high will have _________ psi on a pressure gauge at the bottom of the pipe. wp=h/2.31 wp=275/2.31 119.05 psi
A pump moving 145 gpm of water to a height of 250 feet with an operating efficiency 92% will require _________ horsepower. hp=(gpm*8.33*h*SG)/(33,000*eff) hp=(145*8.33*250*1)/(33,000*.92) 9.95 hp
If the boiler is susceptible to freezing, _________ lay-up should be used. dry
Ligament cracks are cracks that occur between the _________ _________ on the tube sheet. tube holes
If a boiler is rated for 28,000,000 Btu's per hour, what is the equivalent boiler horsepower? Bhp=Btu/33,475 Bhp=28,000,000/33,475 836.45 Bhp
If a boiler is rated for 65,000 pounds of steam per hour, what is the equivalent boiler horsepower? Bhp=lbs.steam per hr./34.5 Bhp=65,000/34.5 1884.06 Bhp
95°F to °C °C=(°F-32)/1.8 °C=(95-32/1.8 35°C
73°C to °F °F=(°C*1.8)+32 °F=(73*1.8)+32 163.4°F
If the analysis of the boiler water indicated 85 ppm of calcium and 44 ppm of magnesium, what is the total hardness? TH=(C*2.5)+(M*4.1) TH=(85*2.5)+(44*4.1)=212.5+180.4 392.9 ppm
Created by: cpotkay