Line F? Burner Orifices Flashcards
1
Q
From the combustion flow formula identify what each variable represents.
A
Q = flow rate (cubic feet per hour)
A = area of the orifice (square inches)
K = discharge coefficient of the orifice
∆P = pressure drop across the orifice (inches water column
Sg = specific gravity of the gas
2
Q
What would be the most reliable source to find the specific gravity of natural gas?
A
From your natural gas utility
3
Q
What is the purpose of an Orifice plate?
A
To measure a general approximation of flow rate
4
Q
The higher the discharge coefficient of the orifice the less restriction there is to gas flow.
TRUE / FALSE
A
True
5
Q
When using an Orifice plate what are three things that could skew the results?
A
- The location of the pressure taps
- The thickness of a square edge plate
- If the appliance is operating in low fire
