K5 - Gas Meters/Clocking PPT/Notes

Question 1

What is a meter?

Answer 1

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

Question 2

What are the two broad categories of gas meters?

Answer 2

1. positive displacement
2. rate-of-flow

Question 3

Positive displacement meters are classed as being _________

Answer 3

volumetric

Question 4

What are the three types of positive displacement meters?

Answer 4

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

Question 5

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

Answer 5

True

Question 6

Diaphragm meters are mainly used for?

Answer 6

residential and small commercial

Question 7

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

Answer 7

True

Question 8

What controls the action of a diaphragm meter?

Answer 8

The pressure differential between the inlet and the outlet

Question 9

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

Answer 9

commercial and industrial

Question 10

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?

Answer 10

True

Question 11

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

Answer 11

4

Question 12

Rate of flow meters are often called ___________ meters

Answer 12

inferential

Question 13

What does inferential mean?

Answer 13

conclusions based on evidence

Question 14

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

True or False?

Answer 14

True

Question 15

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

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

Answer 15

pressure

Question 16

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

Answer 16

Pitot tube meter

Question 17

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

Answer 17

venturi tube meter

Question 18

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

Answer 18

Variable area flow meter

Question 19

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

Not very accurate at low flow rates

Answer 19

Turbine meters

Question 20

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

Answer 20

Vortex shedding

Question 21

Recording instruments to measure flow rate (3)

Answer 21

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

Question 22

BPI is a vertical ________ with consumption dial on top left

Answer 22

rectangle

Question 23

Base volume index is a _____ with hose wrapping around

Answer 23

square

Question 24

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

Answer 24

2-5psig

Question 25

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.

Answer 25

1. heat 2. firing rate or burner input

Question 26

What does over-firing mean?

Answer 26

Sending too much gas to the appliance

Question 27

Under-firing means?

Answer 27

sending too little gas pressure to the appliance?

Question 28

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

Answer 28

10%

Question 29

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

Answer 29

Clocking

Question 30

Consumption dials are used by?

Answer 30

Gas company

Question 31

Test dials are used by?

Answer 31

gas fitter to calculate usage

Question 32

Smaller of the two test dials is often called the?

Answer 32

Proving dial

Question 33

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

Answer 33

one

Question 34

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

Answer 34

True

Question 35

Why do we use time when clocking meters?

Answer 35

Appliances are measured in but/HOUR

Question 36

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

Answer 36

does not

Question 37

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

Answer 37

DOES

Question 38

Why does high pressure through a meter affect calorific value?

Answer 38

Gas is compressed which changes the calorific value per volume

Question 39

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

Answer 39

volume

Question 40

Meter does not care about pressure because it moves a ________

Answer 40

volume

Question 41

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

Answer 41

Equipment manufacturer rating plate

Question 42

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

Answer 42

1/2psig or 14"w.c

Question 43

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

Answer 43

True

Question 44

Standard atmospheric pressure is?

Answer 44

14.7

Question 45

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

Answer 45

1/2psig