Stationary Engineer Questions and Answers.
How much clearance from the top of the boiler is needed for a HP boiler that produces 70000 lbs of ste
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am? - (correct answer) - 7 feet
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On a gas fired boiler what is the proper gas to air mixture - (correct answer) - 30%-
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70% and in special arrangements it can be as high as 100% . ANSWER CHAPTER 11 remember%
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What is the total hardness in a system that was found to have calcium hardness of 60ppm and magnesi
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um hardness of 18ppm and carbon hardness of 12 ppm? - (correct answer) - TH=(Ca x 2.5) + (Mg x 4.1)\
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nTH=(60 x 2.5) + (18 x 4.1)\nTH= 150+73.8 =( 223.8 PPM)
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How often should a complete external inspection of the boiler be done? - (correct answer) -
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Once a Shift
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With 24 hr operation how often do you check the water level? - (correct answer) - Once per shift
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How often do you check the LWCO? - (correct answer) - Once per shift
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How often do you check the High Limit Switch? - (correct answer) - Annually
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A 2" pipe was found to be delivering water at 100 psia at 1040ft per second. How many gallons per hou
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r will it deliver? - (correct answer) - GPM= V (diameter squared) divided by .4085 ANSWER pg 469 BOG
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What controls the amount of blowback on a safety valve? - (correct answer) -
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Blowback ring or adjusting ring
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On a open air expansion tank hot water boiler system; how high should it be mounted? -
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(correct answer) - (4 Feet ) above the highest heating element.
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What is the minimum top clearance of boilers with manholes? - (correct answer) - 5 feet
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Package boilers; steam heating boilers and hot water heating boilers shall have a minimum clearance of
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? - (correct answer) - 2 feet from ceiling. Code chapter 10 page76
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Most important safety device on a boiler? - (correct answer) - Safety relief valve
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What does a Black Liquor Boiler do? - (correct answer) -
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Black Liquor is the by product of wood pulp processing in the paper making industry.
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What does Black liquor boiler known for? - (correct answer) -
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Steam generation and recovery of soda ash
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Maximum line voltage for control on a boiler? - (correct answer) - 150 volts
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,Under what code are boilers designed and constructed? - (correct answer) - ASME- CSD 1
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How many low water cut offs are needed per code for a hot water system when a boiler has inputs grea
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ter than 400,000 btu per hr - (correct answer) - 1 LWCO is needed.
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What is the minimum and maximum size for a safety valve per code for boilers? - (correct answer) -
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Minimum 3/4" and Maximum 4 1/2"
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What stamp is put on a boiler after repairs? - (correct answer) - "R"
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What is the equalizing system used for? - (correct answer) -
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The equalizing system is for warming up the steam lead.
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A blowdown valve is located at the lowest water space of a boiler for three purposes -
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(correct answer) - 1. to remove precipitated sludge or loose scale \
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n2. To permit rapid lowering of the boiler water if it has become too high accidentally \
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n3. As a means of removing water from the boiler so that fresh water may be added to keep the concen
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tration of solids below the point where difficulties may be experienced.
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In the old power boiler which type of feed-water regulators were not used? - (correct answer) -
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Electronic
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After opening a boiler for repairs how much oxygen is needed? - (correct answer) - 19%
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What is the first thing you do when shutting down a boiler? - (correct answer) -
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Turn off (extinguish fire)
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What is the legal limit of acceptable asbestos particles ? - (correct answer) -
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0.1 fibers per cubic centimeter
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What is CREEP? - (correct answer) -
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Creep is defined as the slow deformation of material with time; with the deformation taking place at el
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evated temperatures with no increase in stress.
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What is the BTU content of Anthracite coal? - (correct answer) - 14000 btu/lb
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What substance transfers electrical current in a photocell? - (correct answer) -
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Electricity will flow when the CADMIUM is exposed to sufficient light.
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What device acts as a check valve in both directions and keeps pumps primed? - (correct answer) -
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FOOT VALVES are used for pumps under suction pressure to prevent backflow primed?
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on the suction line.
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What protects boilers from explosion in the furnace? - (correct answer) -
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A flame guard system is an arrangement of flame detection system; interlocks; and relays which will se
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nse the presence of a proper flame in a furnace and cause fuel to be shut off to the furnace if a hazardo
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us condition develops (improper flame or combustion).
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,What size pipe is used as a header in a boiler operating at 100psi? - (correct answer) - 6 inches
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What device is used to measure flue gasses - (correct answer) - The Orsat Analyzer
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Which low water cut off does not have a mercury switch? - (correct answer) -
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The Submerged electrode type
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What is the btu output per lb of #4 fuel oil? - (correct answer) - 18
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What substance is used for the electric transmission in an RTD? - (correct answer) -
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Platinum is used because of its stability at high temperatures
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How much air is needed for the combustion of pulverized coal; gas; oil? - (correct answer) -
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50% for coal and 10-30% for gas & oil
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In old power boilers which type of feedwater regulators were not used? \n(A) hydraulic \n(B) float \
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n(C) thermostatic expansion \n(D) electronic - (correct answer) - ANSWER D electronic/electro-
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magnetic
What is hard forming scale? - (correct answer) - Silica
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With hydroxide present and normal oxygen levels which chemical will cause problems? -
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(correct answer) - Chlorine
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The result from steel manufacturing and under pressure in boilers tends to cause buldging?
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A buldge is caused by ? - (correct answer) -
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A buldge is caused by overheating of the shell plates and it affects the entire thickness of the plate.
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A blister is caused by what ? - (correct answer) -
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Slag inclusion forming a lamination at the time the plate was rolled at the steel mill. A blister is a separ
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ation of the metal from the shell plate caused by impurities rolled into the shell plate when formed.
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With normal oxygen and low alkalinity. what is added to the boiler water? - (correct answer) -
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Neutralizing Amines
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Which chemical is used to combat scale? - (correct answer) - Combined phosphate treatment-
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sodium phosphate
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Other than sulfite what chemical is used to combat corrosion in boilers? - (correct answer) - Hydrazine
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What will neutralize acid? - (correct answer) - Alkali and Lime Soda
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What mechanical device is used to remove scale from firetubes? - (correct answer) -
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A tube rattler or vibrator
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What percentage of the pressure should a boiler have before you test the lever of a safety valve? -
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(correct answer) - 75%
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, Where is internal corrosion most likely to occur on a vertical tube boiler? - (correct answer) -
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Water leg-Mud leg
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What are the minimum and maximum sizes permitted for blow down valves or connections? -
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(correct answer) - 3/4"minimum 2 ½ " maximum
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A boiler operating at a pressure of 65lbs. What is the smallest size feed and blow off connections if the s
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afety valve is set at 90 psi? - (correct answer) - ½ " feed ¾ " blow off
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How often should water columns and water glass levels be checked on a high pressure boiler? -
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(correct answer) - (Once A Shift)\nAt the beginning of each shift - beginning of the work effort
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What takes no actual action chemical part in combustion? - (correct answer) - Nitrogen
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How many ppm of EDTA are needed to tie up 1ppm of hardness? - (correct answer) -
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EDTA requires 10ppm of EDTA and 5 NTA to tie up each 1ppm hardness.
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On a package boiler; how many ways could cause fire puffs when it is started up? - (correct answer) -
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6 ways 1-poor starting draft 2-incorrect firebox 3-wrong burner nozzle 4-lean fire 5-
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insufficient gas pilot or excessive gas pilot 6-water in the oil
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What is the grade of light domestic fuel oil ? - (correct answer) - Grade 1 ( Number 1 )
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How often should you test the operating control? - (correct answer) - Annually
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How often should the testing and inspecting of the burner component? - (correct answer) - Annually
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A lead sulfite photocell is what type of flame sensor? - (correct answer) - Infrared light sensing
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What is the least amount of oxygen needed when a nitrogen blanket is used? - (correct answer) - 19%
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How should a boiler be prepared for inspection? - (correct answer) -
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Extinguish fire and allow boiler to cool slowly. Open the blow down and the drain; vent the boiler to th
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e atmosphere Soot and ashes should be removed from all tubes; shell plates; heads; seams and every a
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ccessible external surface. The blow down should be shut if any other boiler feeds this line. Manhole -
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handhole plates and inspection plugs should be removed. All loose deposits of sludge or sediment shou
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ld be washed out. The blow down should only be opened when it is certain that there is no pressure in t
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he line and no one is inside the boiler. Any scale or oil deposits should be left for the water treatment s
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pecialist to see for analysis. A boiler properly prepared for inspection should be cool; dry and clean. It is
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advisable to attach a red tag marked "person in boiler" to the steam; blowdown; feed and fuel valves an
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d also to the manhole plate whenever someone is inside a boiler.
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What function can a boiler operator contribute to boiler maintenance? - (correct answer) -
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A) maintain a safe reliable plant B) maintenance and efficient plant C) Inspection and logging of items t
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hat need to be corrected during the next maintenance period
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What are manholes and handholes on a boiler for? - (correct answer) - Examination or cleaning
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How much clearance from the top of the boiler is needed for a HP boiler that produces 70000 lbs of ste
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am? - (correct answer) - 7 feet
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On a gas fired boiler what is the proper gas to air mixture - (correct answer) - 30%-
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70% and in special arrangements it can be as high as 100% . ANSWER CHAPTER 11 remember%
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What is the total hardness in a system that was found to have calcium hardness of 60ppm and magnesi
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um hardness of 18ppm and carbon hardness of 12 ppm? - (correct answer) - TH=(Ca x 2.5) + (Mg x 4.1)\
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nTH=(60 x 2.5) + (18 x 4.1)\nTH= 150+73.8 =( 223.8 PPM)
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How often should a complete external inspection of the boiler be done? - (correct answer) -
vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc
Once a Shift
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With 24 hr operation how often do you check the water level? - (correct answer) - Once per shift
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How often do you check the LWCO? - (correct answer) - Once per shift
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How often do you check the High Limit Switch? - (correct answer) - Annually
vc vc vc vc vc vc vc vc vc vc vc vc vcvc
A 2" pipe was found to be delivering water at 100 psia at 1040ft per second. How many gallons per hou
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r will it deliver? - (correct answer) - GPM= V (diameter squared) divided by .4085 ANSWER pg 469 BOG
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What controls the amount of blowback on a safety valve? - (correct answer) -
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Blowback ring or adjusting ring
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On a open air expansion tank hot water boiler system; how high should it be mounted? -
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(correct answer) - (4 Feet ) above the highest heating element.
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What is the minimum top clearance of boilers with manholes? - (correct answer) - 5 feet
vc vc vc vc vc vc vc vc vc vc vc vc vc vcvc vc
Package boilers; steam heating boilers and hot water heating boilers shall have a minimum clearance of
vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc
? - (correct answer) - 2 feet from ceiling. Code chapter 10 page76
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Most important safety device on a boiler? - (correct answer) - Safety relief valve
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What does a Black Liquor Boiler do? - (correct answer) -
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Black Liquor is the by product of wood pulp processing in the paper making industry.
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What does Black liquor boiler known for? - (correct answer) -
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Steam generation and recovery of soda ash
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Maximum line voltage for control on a boiler? - (correct answer) - 150 volts
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,Under what code are boilers designed and constructed? - (correct answer) - ASME- CSD 1
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How many low water cut offs are needed per code for a hot water system when a boiler has inputs grea
vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc
ter than 400,000 btu per hr - (correct answer) - 1 LWCO is needed.
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What is the minimum and maximum size for a safety valve per code for boilers? - (correct answer) -
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Minimum 3/4" and Maximum 4 1/2"
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What stamp is put on a boiler after repairs? - (correct answer) - "R"
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What is the equalizing system used for? - (correct answer) -
vc vc vc vc vc vc vc vc vc vc
The equalizing system is for warming up the steam lead.
vcvc vc vc vc vc vc vc vc vc vc
A blowdown valve is located at the lowest water space of a boiler for three purposes -
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(correct answer) - 1. to remove precipitated sludge or loose scale \
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n2. To permit rapid lowering of the boiler water if it has become too high accidentally \
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n3. As a means of removing water from the boiler so that fresh water may be added to keep the concen
vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc
tration of solids below the point where difficulties may be experienced.
vc vc vc vc vc vc vc vc vc vc
In the old power boiler which type of feed-water regulators were not used? - (correct answer) -
vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc
Electronic
vcvc
After opening a boiler for repairs how much oxygen is needed? - (correct answer) - 19%
vc vc vc vc vc vc vc vc vc vc vc vc vc vc vcvc
What is the first thing you do when shutting down a boiler? - (correct answer) -
vc vc vc vc vc vc vc vc vc vc vc vc vc vc vc
Turn off (extinguish fire)
vcvc vc vc vc
What is the legal limit of acceptable asbestos particles ? - (correct answer) -
vc vc vc vc vc vc vc vc vc vc vc vc vc
0.1 fibers per cubic centimeter
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What is CREEP? - (correct answer) -
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Creep is defined as the slow deformation of material with time; with the deformation taking place at el
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evated temperatures with no increase in stress.
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What is the BTU content of Anthracite coal? - (correct answer) - 14000 btu/lb
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What substance transfers electrical current in a photocell? - (correct answer) -
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Electricity will flow when the CADMIUM is exposed to sufficient light.
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What device acts as a check valve in both directions and keeps pumps primed? - (correct answer) -
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FOOT VALVES are used for pumps under suction pressure to prevent backflow primed?
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on the suction line.
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What protects boilers from explosion in the furnace? - (correct answer) -
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A flame guard system is an arrangement of flame detection system; interlocks; and relays which will se
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nse the presence of a proper flame in a furnace and cause fuel to be shut off to the furnace if a hazardo
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us condition develops (improper flame or combustion).
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,What size pipe is used as a header in a boiler operating at 100psi? - (correct answer) - 6 inches
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What device is used to measure flue gasses - (correct answer) - The Orsat Analyzer
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Which low water cut off does not have a mercury switch? - (correct answer) -
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The Submerged electrode type
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What is the btu output per lb of #4 fuel oil? - (correct answer) - 18
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What substance is used for the electric transmission in an RTD? - (correct answer) -
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Platinum is used because of its stability at high temperatures
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How much air is needed for the combustion of pulverized coal; gas; oil? - (correct answer) -
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50% for coal and 10-30% for gas & oil
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In old power boilers which type of feedwater regulators were not used? \n(A) hydraulic \n(B) float \
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n(C) thermostatic expansion \n(D) electronic - (correct answer) - ANSWER D electronic/electro-
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magnetic
What is hard forming scale? - (correct answer) - Silica
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With hydroxide present and normal oxygen levels which chemical will cause problems? -
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(correct answer) - Chlorine
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The result from steel manufacturing and under pressure in boilers tends to cause buldging?
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A buldge is caused by ? - (correct answer) -
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A buldge is caused by overheating of the shell plates and it affects the entire thickness of the plate.
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A blister is caused by what ? - (correct answer) -
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Slag inclusion forming a lamination at the time the plate was rolled at the steel mill. A blister is a separ
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ation of the metal from the shell plate caused by impurities rolled into the shell plate when formed.
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With normal oxygen and low alkalinity. what is added to the boiler water? - (correct answer) -
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Neutralizing Amines
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Which chemical is used to combat scale? - (correct answer) - Combined phosphate treatment-
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sodium phosphate
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Other than sulfite what chemical is used to combat corrosion in boilers? - (correct answer) - Hydrazine
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What will neutralize acid? - (correct answer) - Alkali and Lime Soda
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What mechanical device is used to remove scale from firetubes? - (correct answer) -
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A tube rattler or vibrator
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What percentage of the pressure should a boiler have before you test the lever of a safety valve? -
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(correct answer) - 75%
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, Where is internal corrosion most likely to occur on a vertical tube boiler? - (correct answer) -
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Water leg-Mud leg
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What are the minimum and maximum sizes permitted for blow down valves or connections? -
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(correct answer) - 3/4"minimum 2 ½ " maximum
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A boiler operating at a pressure of 65lbs. What is the smallest size feed and blow off connections if the s
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afety valve is set at 90 psi? - (correct answer) - ½ " feed ¾ " blow off
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How often should water columns and water glass levels be checked on a high pressure boiler? -
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(correct answer) - (Once A Shift)\nAt the beginning of each shift - beginning of the work effort
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What takes no actual action chemical part in combustion? - (correct answer) - Nitrogen
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How many ppm of EDTA are needed to tie up 1ppm of hardness? - (correct answer) -
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EDTA requires 10ppm of EDTA and 5 NTA to tie up each 1ppm hardness.
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On a package boiler; how many ways could cause fire puffs when it is started up? - (correct answer) -
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6 ways 1-poor starting draft 2-incorrect firebox 3-wrong burner nozzle 4-lean fire 5-
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insufficient gas pilot or excessive gas pilot 6-water in the oil
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What is the grade of light domestic fuel oil ? - (correct answer) - Grade 1 ( Number 1 )
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How often should you test the operating control? - (correct answer) - Annually
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How often should the testing and inspecting of the burner component? - (correct answer) - Annually
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A lead sulfite photocell is what type of flame sensor? - (correct answer) - Infrared light sensing
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What is the least amount of oxygen needed when a nitrogen blanket is used? - (correct answer) - 19%
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How should a boiler be prepared for inspection? - (correct answer) -
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Extinguish fire and allow boiler to cool slowly. Open the blow down and the drain; vent the boiler to th
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e atmosphere Soot and ashes should be removed from all tubes; shell plates; heads; seams and every a
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ccessible external surface. The blow down should be shut if any other boiler feeds this line. Manhole -
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handhole plates and inspection plugs should be removed. All loose deposits of sludge or sediment shou
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ld be washed out. The blow down should only be opened when it is certain that there is no pressure in t
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he line and no one is inside the boiler. Any scale or oil deposits should be left for the water treatment s
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pecialist to see for analysis. A boiler properly prepared for inspection should be cool; dry and clean. It is
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advisable to attach a red tag marked "person in boiler" to the steam; blowdown; feed and fuel valves an
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d also to the manhole plate whenever someone is inside a boiler.
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What function can a boiler operator contribute to boiler maintenance? - (correct answer) -
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A) maintain a safe reliable plant B) maintenance and efficient plant C) Inspection and logging of items t
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hat need to be corrected during the next maintenance period
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What are manholes and handholes on a boiler for? - (correct answer) - Examination or cleaning
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