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;
25 Cards in this Set
- Front
- Back
how much clearance from the top of the boiler is needed for a HP boiler that produces 700,LBS of steam?
|
7 feet.
|
|
on a gas fired boiler the proper gas to air mixture is ?
|
30%-70% and in special arrangement it can be as high as 100%.
|
|
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?
|
hardness formula calcium x2.5+magnesium x4.1
|
|
what is the recommended time for complite external inspection of boiler ?
|
answer /daily /weekly,PG446 study chart
|
|
with 24 hrs operation , how often do you check the water level?
|
Once per shift .
|
|
how often do you check the LWCO?
|
Once per shift.
|
|
how often do you check the high limit swith?
|
Annually
|
|
A 2''pipe was found to be delivering water at 100 psia at 1040ft per second. how many gollons per hrs will it deliver?
|
? GPM=V (diamete squared)
/divided by.4085 answer pg 469 BOG. |
|
what controls the amount of blowback on a safety valve?
|
Blowback ring or adjusting or ring.
|
|
O a open air explansion tank, hot water boiler system,how high should it be mounted?
|
4 ft above hightes heating element.
|
|
what is the minimum top clearance of boiler with manhole?
|
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
|
|
most important safety device?
|
safety relief valve.
|
|
what does a Black Liquor boiler do?
|
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.
|
|
Under what code are boilers designed and constructed?
|
ASME-CSD1 NFPA 8501,8502,8504.
|
|
How many low water cut offs are needed per code for a hot water system?
|
when a boiler has inputs grearer than 400,000 btu per hr,LWCO is needed.
|
|
what is the minimum and size for a safety valve per code for boiler?
|
minimum 3/4'' and maximum 4 1/2''
|
|
what stamp is put on a boiler after repair?
|
''R''
|
|
what is the equalizing system?
|
the equalizing system is for warming up the steam lead.
|
|
a blowdown valve is located at the lowest water space of aboiler for three purposees ?
|
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.
|
|
after opening a boiler for repairs, how much oxgen is needed?
|
19%
|
|
what is the first thing you when shutting down a boiler?
|
turn off/extinguish fire.
|
|
what is the legal limit of acceptable asbestos particles?
|
0.1 fibers per cubic centermeter.
|
|
what is CREEP?
|
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.
|
|
what is BTU content of Anthracite coal?
|
14000 BTUS.
|
|
what substance transfers electrical current in a photocell?
|
Electricity will flow when the CADMIUM is exposed to sufficient light.
|