2019 Question of the Month

 

 

QUESTION of the Month for March 2019 

QUESTION:

In a rotary cup burner, atomization is achieved by?

A:  Fuel oil pressure

B: Air pressure

C: The rotary cup

D: The rotary cup and primary air

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ANSWER:

D: The rotary cup and primary air

Structure of Rotary Cup Burner

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The rotary cup burner forms a film of fuel oil by the centrifugal power of the cup rotation. By giving high air pressure to this film spread fuel, the rotary cup burner creates very fine oil mist which is necessary for good combustion.

The most dominant characteristic of the rotary cup burner is the way of its atomization.
Unlike the pressure jet burner which needs a small nozzle for atomizing, the rotary cup burner uses a cup with wider holes, meaning the structure of the rotary cup burner secures the burner from choking. By this characteristic, the rotary cup burner is capable of firing high viscosity oil.  Moreover, the rotary cup burner utilizes the centrifugal power for atomizing, which means that high pressure is needless for atomization. The low oil pressure of the rotary cup burner is safer to use when there is any leakage from the piping.

QUESTION of the Month for February 2019

QUESTION:

A boiler steam pressure gauge should have a range of?

A:  1 to 1 1/2 times safety valve setting

B:  1 1/2 to 2 times the safety valve setting

C:  2 to 2 1/2 times the safety valve setting

D:  10% of MAWP

ANSWER:

B:  1 1/2 to 2 times the safety valve setting

The range of the instrument should be approximately
one and half  (1 1/2) to twice  (2) the maximum operating pressure. Too low a range may result in:

(a) low fatigue life of the elastic element due to high operating stress and (b) susceptibility to overpressure set due to pressure transients that exceed the normal operating pressure.

Too high a range may yield insufficient resolution for the application.

QUESTION of the Month for January 2019