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Lvl. 4 Gas - Exam #2 > K5 - Gas Meters/Clocking PPT/Notes > Flashcards

K5 - Gas Meters/Clocking PPT/Notes Flashcards

1
Q

What is a meter?

A

device used to measure a defined volume of fuel gases regardless of pressurized quantity.

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2
Q

What are the two broad categories of gas meters?

A
  1. positive displacement
  2. rate-of-flow
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3
Q

Positive displacement meters are classed as being _________

A

volumetric

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4
Q

What are the three types of positive displacement meters?

A
  1. diaphragm (or bellows)
  2. Rotary (Geared or Lobed impeller)
  3. Rotary vane
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5
Q

Positive displacement (volumetric) gas meters record the total quantity or volume of gas that has passed through the meter. True or False?

A

True

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6
Q

Diaphragm meters are mainly used for?

A

residential and small commercial

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7
Q

Diaphragm meters provide highly accurate readings and are mostly used for gas measurement. True or False?

A

True

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8
Q

What controls the action of a diaphragm meter?

A

The pressure differential between the inlet and the outlet

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9
Q

Rotary (Geared or Lobed impeller) are mainly used in __________ and __________ applications and operate with lower pressures and lower volumes

A

commercial and industrial

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10
Q

In a rotary (geared or lobed), two lobed or geared impellers are
synchronized to rotate within a close-fitting housing, displacing a fixed volume of gas each revolution. True or False?

A

True

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11
Q

Rotary VANE meters use vanes to form measuring compartments. One rotation is equal to __ times the compartment volume

A

4

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12
Q

Rate of flow meters are often called ___________ meters

A

inferential

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13
Q

What does inferential mean?

A

conclusions based on evidence

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14
Q

Rate or flow meters include:
- Orifice meters
* Pitot and Pitot static tubes
* Venturi tube
* Area meters
* Turbine meters
* Vortex shedding meters.

True or False?

A

True

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15
Q

orifice meters have ________ taps that measure static pressure at two points:

  1. upstream from orifice
  2. downstream where pressure is near its lowest value
A

pressure

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16
Q

dirt build up can impair the accuracy of which type of meter?

A

Pitot tube meter

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17
Q

Meter most commonly used for air or stream. Reduced taper creates a pressure drop

A

venturi tube meter

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18
Q

What meter consists of a float in a tapered vertical tube and has a pressure differential that remains constant, but area around float increases proportional to flow

A

Variable area flow meter

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19
Q

________ meter senses flow by the magnetic pick-up of each blade as it passes by.

Not very accurate at low flow rates

A

Turbine meters

20
Q

_______ ________ meters use the natural flow of gas around a non-streamlined object. Measurement of flow detects the rate at which the vortices are shed.

A

Vortex shedding

21
Q

Recording instruments to measure flow rate (3)

A
  1. Pressure Factor Measurement (PFM)
  2. Base Pressure Index (BPI)
  3. Base Volume Index (BVI)
22
Q

BPI is a vertical ________ with consumption dial on top left

A

rectangle

23
Q

Base volume index is a _____ with hose wrapping around

A

square

24
Q

PFM consists of a standard gas meter with a special regulator that accurately controls gas pressure. It is normally used when gas pressures are between __ and __ psig and load under 4,000cut/ft/hour

A

2-5psig

25
Q
  1. Each piece of gas equipment is designed to produce a specific amount of ____, where most is
    transferred through the heat exchanger
  2. This amount of heat is called the ______ rate or ______ input. What is exchanged is considered the output.
A
  1. heat
  2. firing rate or burner input
26
Q

What does over-firing mean?

A

Sending too much gas to the appliance

27
Q

Under-firing means?

A

sending too little gas pressure to the appliance?

28
Q

How far below the rated input can you go when sending gas? %

A

10%

29
Q

_________ is using the meter to calculate how much volume of gas is moving through the meter in a given amount of time

A

Clocking

30
Q

Consumption dials are used by?

A

Gas company

31
Q

Test dials are used by?

A

gas fitter to calculate usage

32
Q

Smaller of the two test dials is often called the?

A

Proving dial

33
Q

The gas fitter clocks how long it takes for ____ revolution of the test dial

A

one

34
Q

The flow rate formula measures the
amount of gas that has gone through a gas meter in a given time period. True or False?

A

True

35
Q

Why do we use time when clocking meters?

A

Appliances are measured in but/HOUR

36
Q

Low pressure through meter _____ affect calorific value per cubic foot/meter

A

does not

37
Q

High pressure through meter ____ affect calorific value per cubic foot/meter

A

DOES

38
Q

Why does high pressure through a meter affect calorific value?

A

Gas is compressed which changes the calorific value per volume

39
Q

Meter doesn’t care how dense gas is, only how much ______ passes

A

volume

40
Q

Meter does not care about pressure because it moves a ________

A

volume

41
Q

Gas Regulation B.C requires you to match the burner input to?

A

Equipment manufacturer rating plate

42
Q

Low pressure is classified as ___psig or ___“w.c

A

1/2psig or 14”w.c

43
Q

Standard cu/ft for natural gas is 1000btu per cu/ft or 10.35kw/m3. True or False?

A

True

44
Q

Standard atmospheric pressure is?

A

14.7

45
Q

Pressure correction factor (PCF) is required when the pressure at the meter is greater than ?

A

1/2psig

Lvl. 4 Gas - Exam #2 (9 decks)

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