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Heating Final Prep > Heating Final > Flashcards

Heating Final Flashcards

1
Q

What can a Gas Fitter B work on

A

Up to 400,000BTU

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2
Q

What combustible component of natural gas is typically 95%?

A

Methane

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3
Q

What are NG, Oil and Classed as?

A

Hydrocarbon

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4
Q

All gas contains water, which must be removed at the wellhead because it would freeze forming “hydrates”.

A

True statment

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5
Q

What range is the operating pressures of transmission pipe lines?

A

300-1500PSI

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6
Q

Which substance is added to natural gas to provide its odor?

A

Mercaptan

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7
Q

What does LPG stand for?

A

Liquified Petroleum Gas

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8
Q

What temperature does natural gas need to be at atmospheric pressure need to be in order to liquefy?

A

-258f

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9
Q

What is the boiling point of propane at atmospheric pressure?

A

-44 f

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10
Q

What is the heating value of natural gas?

A

1000 btu/cubic foot

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11
Q

How much combustion air is needed for perfect combustion of one cubic foot of propane?

A

24 cubic feet

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12
Q

Regulators of propane tanks drop the pressure between 5-10psi. What pressure does the home regulator reduce the pressure to?

A

11” wc

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13
Q

What pressure is gas distributed in most areas of the city?

A

12-80 psi

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14
Q

What is the Canadian Natural Gas and Propane installation code book?

A

CSA 149.1

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15
Q

When gas burns properly, the hydrogen combines with the oxygen of the air to produce water vapour. What is produced when the carbon combines with the oxygen?

A

Carbon Dioxide

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16
Q

What are the rough in piping pressure testing requirments for most residential piping systems (2 psi max pressure and less than 200 feet of piping)?

A

15 psi for 15 mins

17
Q

An “A” gasfitter can work on

A

Appliances and Piping downstream of the gas meter

18
Q

What is natural gases range of flammability?

A

5-15%

19
Q

What is the chemical formula for natural gas?

A

CH4

20
Q

Is natural gas lighter or heavier than air?

A

Lighter

21
Q

Propane gas, as a vapour, has a relative density of 1.5 Lb/Ft3. Is it heavier or lighter than air?

A

Heavier

22
Q

What is the structure of a molecule of Propane?

A

3 Carbon 8 Hydrogen

23
Q

The Maximum Flame Temperature for Nat. Gas is 1000F

A

False

24
Q

What is the min size of pressure gauge when pressure testing rough in piping?

A

3”

25
Q

Where and how is standing pressure obtained from a gas furnace system?

A

Between the meter and appliance with no gas flowing

26
Q

Where and how is manifold pressure obtained from a gas furnace system?

A

Between the appliance control valve and burner while the appliance is firing

27
Q

What are the manifold pressures for natural gas and propane?

A

3.5 NG
11 Propane

Both “ wc

28
Q

What is the purpose of an air shutter on a mid efficient gas burner?

A

Control amount of primary air

29
Q

What is the purpose of aldehydes?

A

Nothing

30
Q

What are the three components of the combustion triangle?

A

Air, Fuel, Heat

31
Q

What would cause a roaring and lifting flame?

A

Too much primary air

32
Q

What are the three factors used to determine if a gas flame has the correct characteristics?

A

Colour, shape, size

33
Q

What pressure of natural gas is delivered from a service regulator to piping inside a home?

A

7-14”wc

34
Q

What pressure is finish piping tested to?

A

Working pressure

35
Q

How much is 1 psig equal to?

A

28”wc

36
Q

Vent gases are made up of:

A

Dilution Air and flue gasses

37
Q

How much does 1 Imp Gal of water weight?

A

10 lbs

38
Q

What happens if we don’t remove Sulphur from gas?

A

Gas produces acid rain when burned

39
Q

Propane’s volume increases by how much when changing from a liquid to a vapour?

A

270x

Heating Final Prep (3 decks)

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