Term
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Definition
Gases are Hydrocarbons
React readily with Oxygen
Known as Combustion
3 diff groups (family of gases) |
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Term
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Definition
Manufactured Gas
Any gas produced through industrial process
coke gas, coal gas and towns gas
phase out og general use |
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Term
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Definition
Natural Gas.
formed from decomposition of organic material.
Main component Methane in UK 82-97% of total volume of gas |
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Term
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Definition
Liquid Petroleum Gas (LPG)
LPG is a by product from extraction of natural gas.
LPG can be either Propane or Butane |
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Term
| Odour and Colour of Gases |
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Definition
Nat gas,propane and Butane all colourless and odourless
Odorants are called Thiols
Nat gas-methyl
LPG-t butyl mercaptan,ethyl mercaptan |
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Term
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Definition
Nat gas and LPG do not contain Co
still a risk of asphyxiation due to gas displacing Oxygen. |
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Term
| Specific Gravity (Relative Density) |
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Definition
Air S.G = 1
Nat Gas = 0.6-0.7 (lighter than air)
Propane =1.5
Butane= 2 (Heavier than air) |
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Term
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Definition
| Is the amount of energy released when a specific quantity of gas is burnt under standard ref conditions |
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Term
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Definition
| Is an indication of the heat which can be produced from a burner using a particular gas |
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Term
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Definition
| is the range of concentration of gas mixed with air. |
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Term
| Ignition Temperature of natural gas |
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Definition
ignition temps
Methane -632*C-704*C
Propane- 493*C-547*C
Butane-413*C-527*C |
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Term
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Definition
Combustion is a chemical reaction between the fuel gas and oxygen
which produces 2 main gases
Carbon Dioxide CO2
Water Vapour H2O |
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Term
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Definition
| The Chemical equation for complete combustion of Methane |
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Term
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Definition
Chemical Symbol for
Methane. |
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Term
| Stoichiometric Combustion |
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Definition
| A theoretical concept which can only be achieved under strict laboratory conditions |
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Term
| Equation for IN-COMPLETE combustion of natural gas |
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Definition
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Term
| The Flame speed of natural gas |
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Definition
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Term
| Explosive limits of natural gas |
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Definition
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Term
| Chemical produced by burning natural gas |
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Definition
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Term
| What % of O2 is required to sustain life |
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Definition
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Term
| . What is the approximate volume of air required to completely burn 5 m3 of natural gas? |
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Definition
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Term
Causes of Incomplete Combustion
Inadequate Ventilation |
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Definition
| Supply of combustion air to the appliance burner has become restricted or contaminated |
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Term
Causes of Incomplete Combustion
Vitiation of Atmosphere |
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Definition
Where the air used to supply the appliance becomes
DEFICIENT IN OXYGEN |
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Term
Causes of Incomplete Combustion
Contamination Of Burner |
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Definition
| Debris deposits build up creating a restriction to the air floe to the burner |
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Term
Causes of Incomplete Combustion
Poor Flueing |
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Definition
POCs not being removed will re enter the area and re-circulate into the appliance combustion chamber.
As the air has already been burnt its O2 has been reduced and no longer support complete combustion |
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Term
Causes of Incomplete Combustion
Blocked Flueways |
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Definition
| Flueways are the path that POCs pass through,when this is restricted the POCs re enter the chamber affecting combustion |
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Term
Causes of Incomplete Combustion
Flame Chilling |
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Definition
Hitting a surface cooler than temp of ignition.
No longer supports complete combustion
This can happen when flame touches a heat exchanger. |
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Term
Causes of Incomplete Combustion
Flame Impingement |
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Definition
When one flame touches another or cold surface
Incomplete combustion is created by one flame robbing the other of secondary air or by chilling |
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Term
Causes of Incomplete Combustion
Gas Rich Mixture |
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Definition
Supplying too much gas (over gassing)
Too much gas will create a "reducing flame" |
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Term
Causes of Incomplete Combustion
Lean Gas Mixture |
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Definition
Created either by supplying not enough gas(under gassing).
or correct amount of gas but too much air
too much air creates an "Oxidising" flame |
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