Burners Flashcards
(31 cards)
Two methods Air is supplied too a gas burner
Atmospheric
Mechanical
An aerated burner means
Air is mixed with the gas upstream of the point of ignition
A NON- aerated burner is when
When gas and air are not being mixed before ignited
Two types of flame patterns,
In shot burner “horizontal manner”
Upshot burner “flame is largely vertical”
3 Major factors of a flames characteristics
Color
Size
Shape
Shape of a proper flame
Often has two visible cones
Causes of Floating flames
Over fired burner
Blocked flue
Orifice too large
Lack of air
Characteristics of a lifting flame
Too much primary air burner over fired
orifice too large
Characteristics of a Flashback
- Too much air
- burner under fired
- orifice too large or too small
- gas valve leaking
- defective burners
Chemical breakdown of natural Gas
CH4
Chemical breakdown of propane
C3H8
Chemical breakdown of butane
C4H10
The three “T’s” necessary for proper combustion are
Time temperature turbulence
Energy to raise 1 pound of water 1°F is
1BTU
Maximum water content of natural gas is
7LB’s of H2O/ million ft(cubed) of gas
Local utilities drop gas pressure to
2-80PSI
What do they add to natural gas to give it its odor
Mercaptain
Once gas reaches a home utility companies reduce pressure down to
1/4-1/2 PSIG
Or 7-14” water column. (WC)
First stage (high pressure) regulators for propane drop pressured to?
Second stage (low pressure) regulator’s drop pressure down to?
1st stage: 5-10psig
2nd stage: 11 inches WC (water column)
Natural gas pressure drops is affected by what two things
Pressure
Amount of fittings
Length
The abbreviation of CSA stands for
Canadian standards association
Abbreviation CGA stands for
Canadian gas association
BTU stands for
British thermal unit
WC stands for
Water column
