Quiz Flashcards
Boiler fittings are components directly attach to the boiler
True
Saftey valves on steam boilers are desugn to open slowly
False
The sefety valve should chatter to prevent damage to the disk
False
Safety valves are tested only by performing a try lever test
False
A safety valve try lever test is performed with the boiler at 15 psi or higher
False
The steam pressure gauge must be connected to the higher part of the steam side of the boiler
True
A siphon is connected between the boiler and the steam pressure gauge to prevent water from entering the bourdom tube
False
A slow gauge reads less pressure than is actually in the boiler
True
Live steam allowed to enter the bourdom tube of a steam pressure gauge will damage the gauge
True
The water column should be blown down once a shift
True
The water column is used to indicate the water level in the blowdown tank
False
With the boiler in ita NOWL the gauge glass is aproximately half full
True
The purpose of the water column is to slow down the turbulance of the boiler
True
In low pressure steam boilers, two methods of determining water level are try cocks and gauge glasses
True
Gauge glasses are calibrated in pounds per square inch
False
With the water at the NOWL, steam is discharge from the bottom try cock when it opened
False
With the water at the NOWL, the middle try cock discharges a mixture of water and steam when it opened
True
With water at the NOWL, water is dischage from the top try cock when opened
False
If the top line of the gauge glass is closed or clogged, the glass will fill with water
True
If the bottom line to the gauge glass is close or clogged, the glass will be empty
False
To ensure the lines to the gauge glass are clear, it is recomended that the gauge glass be blown down at least once a month
False
The bottom blowdown line must be conected to the highest part of the steam side of the boiler
False
A high surface tension on boiler water can lead to foaming
True
Surface impurities are remove from the boiler by using the bottom blowdown valves
False
Boilers equipped with a quick-opening valve and a slow-opening valve must have the quick-opening valve closest to the boiler
True
Only watertube boilers have bottom blowdown valves
False
A high water level in a boiler can lead to carryover
True
When dumping a boiler there should be a maximum steam pressure in the boiler to force water from the boiler
False
To correct a high water level condition, the operator must open the bottom blowdown valve
True
Bottom blowdown valves are used when dumping the boiler
True
A fusible plug is the last warning the operator has of a dangerous low water condition in the boiler
True
The core of the fusible plug melts at approximately 450 F
True
The boiler vent should be open when filling the boiler with water
True
A burner should always start in high fire to ensure enough fuel for ignition
False
The_____is the most importan valve on a boiler
Safety valve
The MAWP on a low pressure boiler is ____psi
15 psi
Total force on a safty valve is equel to _____
Area times pressure
The ASME code states that boiler with over _____squere feet of heating surface must have two or more safty valves
500 square feet
The area of a safety valve 4” in diameter is_____square inches
12.5664
The only valve permitted between the safety valve and the boiler is?
None. No valve is permitted
The range of the pressure gauge should be____times the MAWP of the boiler
1 1/2 to 2
In some states_____safety valves are permitted on steam boiler
Spring-loaded pop-off
The total force on a safety valve 2 1/2” in diameter with a steam pressure of 15 psi is_____
73.63125
The steam pressure gauge on the boiler is calibrated to read_____
Pounds per square inch
Steam is prevented from entering the bourdon tube of the pressure by a
Siphon
A_____pressure gauge can read either vacuum or pressure
Compound
Vacuum is pressure_____pressure
Below atmospheric
Safety valves are designed to popopen and stay open untel there is_____psi drop in pressure
2 to 4
The water column is located at the NOWL of a low pressure steam boiler, so the lowest visible part of the gauge glass is_____above the highest heating surface
One inch
Blowback is the_____in the boiler after the safety valve has opened
Drop in pressure
Impurities that build up on the surface of the water in the boiler prevents_____from breaking though the surface of the water
Steam
To prevent a vacuum from forming when taking the boiler off-line, the____must be open when pressure is still on the boiler
Boiler vent
The operating range of the boiler is control by the______
Pressure control
The______regulates the high and low fire of the boiler
Modulating pressure control
The best time to blow down a boiler to remove sludge and sediment is when the boiler is under a____load
Light
According to the ASME code, a try lever test on safety valves should be performed every_____ the boiler is in operation
30 days
The capacity of a safety valve is measured by the amount of steam that can be discharged per_____
Hour
The safety calve on a low pressure boiler is designed to open when pressure in the boiler exceeds____
The safety valve setting
After the total force of the steam has lifted the safety valve off its seat, steam enters the______
Huddling chamber
_______causes false water level readings in the gauge glass
Foaming
On an additive pressure control,_____pressure plus_____pressure equels_____pressure
Cut-in, differential, cut-out
