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Gas Meter Apprentice Revision > Overall Revision > Flashcards

Overall Revision Flashcards

1
Q

9 kW Open Flue boiler, What is the ventiliation requirement?

A

Check the data badge, take away 7 kW for adventitaious air and multiply the the remaining 2 kW by 5. Answer is 10 cm2 Ventilation required and an openable window/door leading to the outside.

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2
Q

5 kW Open Flue boiler, What is the ventiliation requirement?

A

Below 7 kW so adventitious air eliminates the the need for ventilation requirements.

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3
Q

28 kW Room sealed boiler within a compartment ventiliated to the outside, what are the ventiliation requirements?

A

Top Vent: 28 kW x 5 cm2
Bottom Vent: 28 kW x 5 cm2

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4
Q

18 kW Open Flue boiler within a compartment, ventiliated via an internal room, what are the ventiliation requirements?

A

Top Vent: 18 kW x 10 cm2 = 180 cm2
Bottom Vent: 18 kW x 20 cm2 = 360 cm2

As we are ventilating to an internal room, a vent is required for combustion air direct from outside.

Effective free area of vent = 18 kW - 7 kW
= 11 kW x 5 cm2
= 55 cm2

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5
Q

9 kW Open Flue boiler within a compartment, ventiliated to the outside, what are the ventiliation requirements?

A

Top Vent: 9 kW x 5 cm2 = 45 cm2
Bottom Vent: 9 kW x 10 cm2 = 90 cm2

As the compartment ventiliation is direct to outside, no further requirement for additional combustion ventiliation.

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6
Q

What are the flamability limits of Natural Gas?

A

5-15 %

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7
Q

What is the minimum distance that copper pipe should be from an electrical socket or light switch?

A

25 mm

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8
Q

Minimum distance that the gas meter should be from a fuse box?

A

150mm

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9
Q

Unsafe Situations for a flueless cooker?

A

Cooker bayonet to have a clean U bend looking downwards and be 750 mm distance above the ground level.
Does the cooker have a chain if it is isolated?
The safety lid works properly.
Overall good condition of the appliance?
No water fitting used for cooker pipework?
Not installed in a bathroom.
Correct ventilation?

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10
Q

What is the minimum distance a flue should be from a window?

A

300mm

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11
Q

How often should a flue be supported?

A

Every 1.8m

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12
Q

How often should a room sealed boiler be supported?

A

Every 2m

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13
Q

How far should the guard be from the terminal?

A

50mm

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14
Q

Where should a carbon monoxide alarm be located?

A

Between 1m and 3m from the appliance.

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15
Q

Where should the carbon monoxide be if wall mounted?

A

1.5m from floor level and at least 150 mm below the ceiling but highier than any window or door within the room.

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16
Q

Where should the carbon monoxide alarm be if ceiling mounted?

A

At least 300 mm away from any wall

17
Q

When completing a combustion analysis procedure, how long should the level of CO be monitored?

A

15 minutes.

18
Q

What is the specific gravity of Natural Gas?

A

0.6

19
Q

Ventilation required for a flueless appliance if room size is 8 m3?

A

50 cm2 ventiliation and a window/door leading directly to the outside.

20
Q

Ventilation required for a flueless appliance if room size is 4 m3?

A

100 cm2 ventilation + openable window or door leading to the outside.

21
Q

Ventilation requirements for a flueless appliance if room size is above 10 m3?

A

Just a window or door leading to the outside.

22
Q

How much ventilation does a DFE require?

A

Most require a 100 cm2 air vent with adventitious air already taken off.

23
Q

Name 4 parts of an Open Flue?

A

Primary Flue, Down draught diverter, secondary flue and a terminal.

24
Q

What is the minimum distance that the vertical chimney is required above the appliance/draught diverter?

A

600 mm

25
Q

What is the minimum circular CSA of a chimney with gas blocks?

A

16500 mm2

26
Q

What is the minimum circular CSA of a new gas fire?

A

12000 mm2

27
Q

Offset blocks, what is the minimum offset?

A

30 degrees

28
Q

Approved terminals should be designed with an entry of what size?

A

6mm ball but prevent entry of a 16mm ball.

29
Q

At what size chimney diameter, should it have an approved terminal?

A

170mm or less.

30
Q

What minimum distance chimney flashing is required?

A

150 mm

31
Q

Chimney outlets based on a ridge, how far should the terminals be apart?

A

50 mm and should terminate at the same height

32
Q

Chimney outlets based on a ridge which are open on all 4 sides, should be at least how far apart?

A

300 mm

33
Q

What is the first gas family? What is the second gas family? What is the third gas family?

A

1st - Manufactored gas. 2nd - Natural gas. 3rd - LPG.

Gas Meter Apprentice Revision (4 decks)

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