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25 Cards in this Set
- Front
- Back
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how much clearance from the top of the boiler is needed for a HP boiler that produces 700,LBS of steam?
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7 feet.
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on a gas fired boiler the proper gas to air mixture is ?
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30%-70% and in special arrangement it can be as high as 100%.
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what is the total hardness in a system that was found to have calcium (2.5) hardness of 60 ppm, and margnesium (4.1) hardness of 18ppm, and carbon hardness of 12 ppm?
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hardness formula calcium x2.5+magnesium x4.1
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what is the recommended time for complite external inspection of boiler ?
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answer /daily /weekly,PG446 study chart
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with 24 hrs operation , how often do you check the water level?
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Once per shift .
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how often do you check the LWCO?
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Once per shift.
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how often do you check the high limit swith?
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Annually
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A 2''pipe was found to be delivering water at 100 psia at 1040ft per second. how many gollons per hrs will it deliver?
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? GPM=V (diamete squared)
/divided by.4085 answer pg 469 BOG. |
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what controls the amount of blowback on a safety valve?
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Blowback ring or adjusting or ring.
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O a open air explansion tank, hot water boiler system,how high should it be mounted?
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4 ft above hightes heating element.
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what is the minimum top clearance of boiler with manhole?
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3 ft package boilers,steam heating boilers and hot wter boilers shall have minimum clearance of 2 ft from ceiling.code chapter 10 pg 76
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most important safety device?
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safety relief valve.
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what does a Black Liquor boiler do?
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black liquor is the by product of wood pulp processing in the paper making industry.Known for production of steam and soda ash 58% solids needed to sustain combuction.
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Under what code are boilers designed and constructed?
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ASME-CSD1 NFPA 8501,8502,8504.
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How many low water cut offs are needed per code for a hot water system?
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when a boiler has inputs grearer than 400,000 btu per hr,LWCO is needed.
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what is the minimum and size for a safety valve per code for boiler?
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minimum 3/4'' and maximum 4 1/2''
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what stamp is put on a boiler after repair?
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''R''
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what is the equalizing system?
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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 aboiler for three purposees ?
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1-to remove precipitated sludge or loose scale. 2 to permit rapid lowering of the boiler water if it has became too high accidentally.3 as a means of removing water from the boiler so that fresh water may be added to keep the concentrtion of solids below the point where difficulties may be experienced.
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after opening a boiler for repairs, how much oxgen is needed?
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19%
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what is the first thing you when shutting down a boiler?
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turn off/extinguish fire.
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what is the legal limit of acceptable asbestos particles?
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0.1 fibers per cubic centermeter.
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what is CREEP?
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creep is defined as the slow deformation of material with time,with the deformation taking place at elevated temps with no increase in stress.small hairline crack.
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what is BTU content of Anthracite coal?
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14000 BTUS.
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what substance transfers electrical current in a photocell?
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Electricity will flow when the CADMIUM is exposed to sufficient light.
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