Book 1 Chapter 17: Steam Traps Flashcards
Which of the following are types of traps?
A) Thermodynamic
B) Thermostatic
C) Mechanical
D) All of the above
D) All of the above
As steam enters an inverted bucket steam trap, it will ____________, giving it buoyancy, and cause the bucket to rise.
A) Release air
B) Collect at the top of the inverted bucket
C) Increase in temperature
D) Condense
B) Collect at the top of the inverted bucket
In a bimetal steam trap, ____________ are welded together.
A) Dissimilar metals
B) Strips of copper
C) Strips of tin
D) High temperature strips of plastic
A) Dissimilar metals
Using a _______ valve in the bypass line makes it possible to rid the system of condensate by hand throttling while the trap is out of service.
A) Gate
B) Globe
C) Needle
D) Ball
B) Globe
To reduce the effect of water hammer, the suction and discharge lines of pumps are often equipped with:
A) Check valves
B) Relief valves
C) Air chambers
D) All of the above
D) All of the above
A mechanical steam trap:
A) Has alcohol inside the float
B) Can be fitted in any position
C) Has a very low pressure range of operation
D) May have a thermostatic air vent
E) Should be fitted to the safety valve drain
D) May have a thermostatic air vent
A steam trap, that has a discharge temperature higher than the temperature corresponding to the condensate return, indicates that:
A) There is condensate being collected by the trap
B) The trap is passing steam
C) The trap is plugged up
D) The inlet steam is superheated
E) The check valve in the condensate line has failed
B) The trap is passing steam
The sudden closing of a valve in a water pipeline can result in:
A) A pressure shock wave to surge through the pipeline
B) An increase in water pressure at the valve
C) A sudden decrease in the velocity of the water
D) A flow reversal of water in the pipeline
E) All of the above
E) All of the above
A steam trap that is in service but feels cold indicates that:
A) The trap is plugged
B) The steam is cold
C) The condensate line is frozen
D) The steam is not superheated
E) The trap is passing steam
A) The trap is plugged
Steam traps are usually located at the:
A) Lowest point of a steam line
B) Highest point of a steam line
C) Highest point of a hot water line
D) Lowest point of a hot water line
E) Hottest point of a steam line
A) Lowest point of a steam line
A thermostatic trap is controlled by a:
A) Bucket that flips when filled with condensate
B) Temperature difference between condensate and steam
C) High level float control
D) Difference in velocity between condensate and steam
E) Combination of a bucket and a float
B) Temperature difference between condensate and steam
A ________ should be installed just ahead of a steam trap.
A) Non-return valve
B) Pressure reducing valve
C) Strainer
D) Check valve
E) Pressure gauge
C) Strainer
Before admitting steam to any system:
A) All valves must be closed
B) Condensate must be removed from the system
C) Any check valves in the line must be opened
D) All drains must be closed
E) All valves must be opened
B) Condensate must be removed from the system
The operation of a mechanical steam trap depends on the:
A) Difference in specific gravity between the steam and condensate
B) Liquid level in the condensate tank
C) Liquid level in the steam trap
D) Difference in temperature between the steam and condensate
E) Difference in pressure between the steam and condensate
C) Liquid level in the steam trap
The purpose of a steam trap is to:
A) Remove steam from a steam line without allowing water to pass
B) Collect steam for storage purposes
C) Reduce high, pressure steam to a lower pressure
D) Prevent sludge compounds from entering the steam line
E) Remove condensation from steam lines without allowing steam to pass
E) Remove condensation from steam lines without allowing steam to pass through
In order to reduce the effect of water hammer on pump discharge and suction lines, these lines are often equipped with:
A) Strainers
B) Corrugated expansion joints
C) Air chambers
D) Globe valves
E) Stress in pipe hangers
C) Air chambers
A disadvantage of a ball float steam trap is that it:
A) Is vulnerable to damage from water hammer
B) Does not handle air well
C) Is greatly affected by changes in steam pressure
D) Only operates well under high condensate loads
E) Must be bypassed on start up
A) Is vulnerable to damage from water hammer
To reduce the effect of water hammer, the suction and discharge lines of pumps are often equipped with:
A) Check valves
B) Air chambers
C) Relief valves
D) All of the above
E) Non of the above
D) All of the above
The ball float trap has the disadvantage of being vulnerable to damage from:
A) High steam temperature
B) High steam pressure
C) High condensate temperature
D) Water hammer
E) Air
d) Water hammer
One of the different general classes of traps according to their principle of operation is the ______ trap.
A) Electronic
B) Pneumatic
C) Hydraulic
D) Thermostatic
E) Electrical
D) Thermostatic
The air present in steam lines and equipment must also be removed to prevent:
A) Pitting from carbon dioxide
B) Resulting from carbon dioxide
C) Corrosion from oxygen
D) Caustic embrittlement
E) Pitting from oxygen
E) Pitting from oxygen
Most traps are designed to discharge any _______ present in the lines or equipment.
A) Oil
B) Oxygen
C) Air
D) Steam
E) Carbon dioxide
C) Air
In one design of a mechanical trap a _____ is used to open and close the trap outlet valve.
A) Temperature difference
B) Ball float
C) Bi-metallic strip
D) Pressure difference
E) Bellows
B) Ball float
Using a _______ valve in the bypass line makes it possible to rid the system of condensate by hand throttling while the trap is out of service.
A) Needle
B) Globe
C) Ball
D) Butterfly
E) Gate
B) Globe
The purpose of the steam trap is to discharge _________ from steam lines and equipment without permitting steam to escape.
A) Water and condensate
B) Water and air
C) Air and steam
D) Condensate and air
E) Steam and condensate
A) Water and condensate
The operation of the thermostatic trap depends upon the difference in:
A) Density between the steam and the condensate
B) Pressure between the steam and the condensate
C) Temperature between and the air
D) Temperature between the steam and the condensate
E) Pressure between the steam and the air
D) Temperature between the steam and the condensate
In the design of a mechanical trap a/an _______ is used to open and close the trap outlet valve.
A) Pressure difference
B) Temperature difference
C) Bellows
D) Inverted bucket
E) Mi-metallic strip
D) Inverted bucket
