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Plumbing 4th Year > Gas Final > Flashcards

Gas Final Flashcards

1
Q

How far should a swimming pool heater be from the property line?

A

18”

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2
Q

A direct vent should be how far from the regulator vent?

A

3’

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3
Q

How many supports are required on a horizontal tank?

A

2

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4
Q

What is the max pressure in a family dwelling?

A

2 psig

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5
Q

What is the max propane pressure on a commercial building?

A

20 psi

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6
Q

What type of material uses gaskets?

A

Neoprene

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7
Q

What are the joining methods for underground tubing?

A
  • Brazing
  • Flare
  • Mechanical approved compression
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8
Q

What is the maximum metal flex connector for decorative appliances?

A

2’ (600mm)

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9
Q

What is the minimum distance for non-special vent termination?

A

2’

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10
Q

For a hot water tank with 500 BTUH, what is the air supply duct size?

A

None is required

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11
Q

What is the max setting for a high limit on a forced air furnace?

A

250 degrees F

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12
Q

On a 3000 BTUH appliance, how much air is required for combustion besides excess air and dilution air?

A

100 BTUH for 1 cubic foot of air

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13
Q

What type of pipe is not allowed on gas?

A

Cast iron

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14
Q

What is not allowed regarding piping?

A
  • Piping going through the wall with twin joint
  • Piping under foundation wall
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15
Q

What do you need when installing plastic pipe underground?

A

Tracer wire

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16
Q

What is the bury depth on a gas line?

A

15”

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17
Q

What is the flammability range of propane?

A

2.15 - 9.6%

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18
Q

How does the high limit operate?

A

On rise in temperature

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19
Q

What is the minimum size for the future on a gas line?

A

Full size if branch

20
Q

What is the minimum service clearance?

A

24”

21
Q

What is the minimum clearance of B vent?

A
22
Q

What is the minimum clearance of C vent?

A

6”

23
Q

Where is the relief valve on propane located?

A

Vapour space

24
Q

Are you allowed to use plastic pipe on liquid propane?

A

No

25
Q

What is the minimum length of a dirt pocket?

A

3”

26
Q

What must be done in a corrosive environment?

A

Coated

27
Q

What is the schedule on 1/2 threaded pipe?

A

80

28
Q

What is the pressure test requirement for a gas system of 200’ and 2 psi?

A

15 psi for 60 min

29
Q

What is the cause of a big pressure drop in a gas system?

A

Undersized pipes

30
Q

What causes internal regulator freeze up?

A

High demand

31
Q

What happens if the vent regulator is plugged?

A

Doesn’t open on call for heat

32
Q

What happens when the vent is blocked on a regulator?

A

Sluggish operation

33
Q

What does the turndown test verify?

A

Positioning of pilot assembly

34
Q

Who is responsible to show the consumer how an appliance works?

A

Installer

35
Q

What is the orifice size for 4” WC and 24000 BTUH with 4 burners?

A

27

36
Q

Why do you drill orifice size two sizes smaller?

A

Because can drill steady enough to have perfect hole

37
Q

What type of voltage is on an electromagnetic device (pilot) for forced air furnace?

A

Millivolts

38
Q

What has the fastest response time?

A

Flame rod or thermocouple or thermopile or generator

39
Q

What can be used on intermittent pilot?

A

Thermocouple or thermopile

40
Q

What has the highest voltage?

A

Spark igniter 10-30 KV AC

41
Q

Where do you take the rectification signal?

A

Flame signal to ground

42
Q

What is the type of regulator on a propane system?

A

Two stage

43
Q

What type of current is used on the rectification signal?

A

DC

44
Q

What is the minimum vent height on a unit heater?

A
45
Q

What engages the relay for the blower motor?

A

Thermostat

Plumbing 4th Year (6 decks)

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