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Course L > Gas - Prop Storage Cath Protection Clocking Orifice Sizing > Flashcards

Gas - Prop Storage Cath Protection Clocking Orifice Sizing Flashcards

1
Q

What does the term “LP” gas refer to?

Which two gases fall under this category?

A

Liquefied petroleum.

Butane and Propane.

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2
Q

What is the difference between a gas system supplied with Natural Gas and one that is supplied with Propane?

A

Natural Gas: Large system and unlimited supply.

Propane[][][]: Smaller source and limited amount.

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3
Q

What are the two ways that Propane is stored?

A

Cylinders and tanks.

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4
Q

How is a cylinder sized?

How is a tank sized[][][][]?

A

Cylinder[]]: Maximum weight of LP-gas / Pounds of Propane liquid.

Tank: Maximum amount of water / Gallons of water capacity “w.c.”.

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5
Q

What size is the largest cylinder?

What size is the largest tank[][][]]?

A

Cylinder: 500 pounds of liquid LP-gas.

Tank[][]]: 1,000 gallons[][][][][][][][][][][][][][][]

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6
Q

What is the maximum fill level of a tank or cylinder?

A

80%.

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7
Q

How often does a cylinder need to be re certified?

A

Every 10 years.

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8
Q

How often should a cylinder be inspected?

A

Every time it is filled up.

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9
Q

What is a service valve?

A

Controls the flow of gas out of the container.

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10
Q

What are two types of service valves and what is the difference between the two?

A

Liquid service valve - CGA thread.

Vapor service valve - POL (Prestolite) thread.

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11
Q

What are the pressure relief valve settings for a cylinder and a tank?

A

Cylinder - 375 psig.

Tank - 250 or 312 psig.

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12
Q

A combination valve is a combination of what three valves?

A

Filler valve, safety valve and service valve.

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13
Q

Measures the level of LP-gas liquid in the cylinder or tank is the definition of?

A

Fixed level liquid gauge.

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14
Q

The volume of LP-gas that can be boiled off inside the container during a period of time is the definition of?

A

Vaporization rate.

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15
Q

Why is it important to know what the vaporization rate is in a cylinder or tank?

A

To make sure appliances operate properly.

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16
Q

What are the factors that can influence vaporization rate?

A

Ambient temperature.

Level of gas[][][][][][][][][]

Location[][][]][][][][][][][][]]

Relative humidity[][][][][]

Surface area of tank[]]

Temperature of gas[][]]

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17
Q

The input rating as shown on the appliance rating plate is the definition of?

A

Appliance input.

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18
Q

Actual amount of gas used, divided by the maximum amount of LP-gas that the appliance would use if it operated continually is the definition of?

A

Load factor.

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19
Q

The load actually drawn from the container is the definition of?

A

Effective load.

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20
Q

The methods used to protect steel piping or ferrous piping from corroding is the definition of?

A

Cathodic protection.

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21
Q

What are the four things necessary for corrosion to occur?

A

Anode.

Cathode.

Electrolyte.

Conductive path.

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22
Q

How is it determined which part of the system is the anode and which part of the system is the cathode?

A

The anode will always end up being the part of the pipe with the most potential energy.

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23
Q

What are the ways we can protect piping from corroding?

A

Electrical insulation.

Protective coatings.

Sacrificial anode[][][]

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24
Q

Can a pipe be repaired or have more of a coating added to it? If so, what type of materials can we use for the coating.

A

Yes.

Heatshrink sleaves or polyken tape.

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25
Q

What is the name of the test which checks how well the protective coating is standing up?

A

Jeep test.

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26
Q

A piece of metal that is placed in the system which has more potential than the pipe that is is protecting is the definition of?

A

Sacrificial anode.

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27
Q

What is a sacrificial anode usually made of?

A

Magnesium or zinc.

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28
Q

To calculate the actual burner input to a gas appliance to determine if the appliance is overfired or underfired is the definition of?

A

Clocking.

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29
Q

When clocking is the flow rate expressed in cubic feet or cubic meters?

A

Depends on the meter set that has been installed.

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30
Q

Does the calorific value come into play in the flow rate formula?

A

No.

The calorific value only comes into play when we are trying to calculate the clocked input to the appliance.

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31
Q

Do the units for the test dial and the calorific value have to be the same when calculating input?

A

Yes.

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32
Q

When is a pressure correction factor (PCF) required?

A

14” w.c. or 1/2 pound or higher.

33
Q

Name two types of positive displacement meters.

Which of the two meters is more commonly used?

Which of the two meters is used for larger applications?

A

Diaphram (Bellows) and Rotary (Geared/Lobed Impellar).

The Diaphram is the most frequently used[][][][][][][][][][][][][]

The Rotary is used for larger applications[][][][][][][][][][][][][][]

34
Q

Typical appliance regulator settings used to regulate pressure to the appliance manifold would be:

A

Natural Gas: 3.5” w.c.

LP Gases[][]]: 11” w.c[]]

35
Q

Name the two types of dials on a gas meter?

A

Consumption dials.

Test dials[][][][][][][][][]

36
Q

Does the gasfitter deal with the consumption dial or test dial?

A

Test dials.

Consumption dials are used by the gas utility company to measure the amount of gas used by the consumer.

37
Q

Name three types of metering systems commonly used.

A

Pressure Factor Measurement (PFM).

Base Pressure Index (BPI)[][][][][][][][][][]]

Base Volume Index (BVI)[][][][][][][][][][][]]

38
Q

Which type of metering system adjusts the consumption dials to reflect selling pressure?

A

Both BPI and BVI meters adjust the consumption dials to reflect selling pressure.

39
Q

Which of the metering systems adjusts the consumptioin dials to reflect both selling pressure and selling temperature?

A

Base Volume Index (BVI).

40
Q

Which four factors influence gas flow through an orifice?

A

Area.

K factor.

Pressure drop.

Specific gravity.

41
Q

What are the three types of main burner orifices?

A

Adjustable.

Fixed[][][][][]

Universal[][]

42
Q

Which type of orifice is used on industrial boilers and can be used to increase or decrease the effective opening of the orifice?

A

Adjustable.

43
Q

Which type of orifice is the most common?

A

Fixed.

44
Q

Which type of orifice is used mainly on dual fuel appliances?

A

Universal.

45
Q

What are the four ways in which to identify drill size?

A

Dill Manufacturers Size (DMS).

Fractional Drill Sizes[][][][][][][][]]

Letter Drill Sizes[][][][][][][][][][][][]]

Metric Drill Sizes[][][][][][][][][][][][]

46
Q

If the flow rate through a pipe is increased, the pressure drop will:

A. Increase.

B. Decrease.

C. Remain constant.

D. Not be very important.

A

A. Increase.

47
Q

A propane-fired system at 11” w.c. is limited to a maximum pressure drop of:

A. 10 of the intial load.

B. 0.5” w.c[][][][][][][][][][]]

C. 1”w.c[][][][][][][][][][][][][]]

D. None of the above are correct.

A

C. 1” w.c.

48
Q

The safety relief valve on a propane cylinder must:

A. Be connected to the side of the tank

B. Be connected to the top of the tank[]

C. Must communicate with the vapor space of the tank only.

D.Could be installed on the bottom of the tank[][][][][][][][][][][][]]

A

C. Must communicate with the vapor space of the tank only.

49
Q

A fixed tube liquid level guage:

A. Can only indicate when the maximum filling level has been reached.

B. Uses a tube that slides up and down to determine liquid level[][][][][][]]

C. Has a rotating tube to locate the liquid level[][][][][][][][][][][][][][][][][][][][][][][]

D. Can only indicate when max filling level has been reached but only correct to 40°F.

A

A. Can only indicate when the maximum filling level has been reached.

50
Q

The tare weight of a cylinder is the weight of:

A. The cylinder when correctly filled.

B. Propane which can be put into it[]

C. The cylinder when it is empty[][][][]

D. None of the above[][][][][][][][][][][][][]]

A

C. The cylinder when it is empty.

51
Q

The operating pressure in a low pressure propane cylinder gas line is:

A. 4” w.c.

B. 7” w.c.

C. 6.35” w.c.

D. 11” w.c.[][][]

A

D. 11” w.c.

52
Q

The anode should be buried at least __ feet below the bottom of the underground pipe.

A. 1.

B. 2.

C. 3.

D. 4.

A

C. 3.

53
Q

The two methods of connecting anode wires to the pipe are:

A. Soldering and brazing.

B. Cadwelding and brazing[]]

C. Cadwelding and soldering.

D. None of the above/Wire should be taped to the pipe using non-static electric tape.

A

B. Cadwelding and brazing.

54
Q

The principle of adding cathodic protection to an underground piping system is to allow the _____ to corrode.

A. Anode.

B. Cathode.

C. Electrolyte.

D. All of the above.

A

A. Anode.

55
Q

The anode should be located __ feet horizontally from the pipe it protects.

A. 1.

B. 2.

C. 3.

D. 4.

A

B. 2.

56
Q

Fittings used to prevent a conductive path to other grounds are referred to as:

A. Di-electric fittings.

B. Non-electric fittings.

C. Cathodic fittings[][][]]

D. None of the above[]]

A

A. Di-electric fittings.

57
Q

If you were welding a branch line into a 4 inch gas supply header, the branch line can be a maximum __ inches in diameter.

A. 4.

B. 2.

C. 1[]

D. 3/4.

A

B. 2.

58
Q

In a gas piping system, an excessively high pressure drop will indicate that the:

A. Gas pressure is too low.

B. Gas pressure is too high.

C. Gas piping is under-sized.

D. Flow of gas through the gas meter is restricted and the meter should be repaired.

A

C. Gas piping is under-sized.

59
Q

When converting an appliance from Propane to Natural Gas, the gasfitter will:

A

Reduce the gas pressure and increase the orifice.

60
Q

Propane orifices are smaller or larger than Natural Gas orifices?

A

Smaller.

61
Q

Orifices used in pilot burners are usually listed according to?

A

Diameter.

62
Q

A gasfitter can supply less gas to an appliance fitted with an adjustable orifice by:

A

Turning the orifice spud towards the point.

63
Q

Doubling the diameter of an orifice will cause the flow to rate to:

A

Increase by 4 times.

64
Q

When determining the input to an appliance that is not metered, at what point should the pressure be checked?

A

On the manifold downstream of all valve components.

65
Q

For every 1,000 feet of increase in elevation the atmospheric pressure will decrease approximately?

A

0.5 psi

66
Q

The purpose of an orifice is to:

A. Regulate the pressure of the gas.

B. Regulate the volume of gas passing to the burner.

C. Regulate the exact amount of primary air[][][][][][][][][]]

D. Mix the gas and air properly[][][][][][][][][][][][][][][][][][][][][]

A

B. Regulate the volume of gas passing to the burner.

67
Q

An appliance firing on Natural Gas at 2 inches w.c is to be redesigned to fire on Natural gas at 4 inches w.c. In order to maintain the same Btu/h input, the orifice:

A. Must be increased in cross-sectional area.

B. Must be decreased in cross-sectional area.

C. Must not be tampered with[][][][][][][][][][][][][][]][]

D. Must be removed and discared[][][][][][][][][][][]]

A

B. Must be decreased in cross-sectional area.

68
Q

When comparing orifices used in Propane appliances with those used in Natural Gas with the same Btu input, we find the propane orifices:

A. Are smaller than those used for the Natural Gas appliance.

B. Are larger than those used for the Natural Gas appliance[][]]

C. Are the same size as those used for the Natural Gas appliance.

D. Can be either larger or smaller than those used for the Natural Gas appliance.

A

A. Are smaller than those used for the Natural Gas appliance.

69
Q

In order to size orifices on a gas appliance, it is necessary to know the:

A. Heating value of gas and its specific gravity.

B. Heating value of gas and its type of appliance.

C. Specific gravity of gas and type of appliance[][]

D. Type of gas and the operating pressure of the appliance.

A

D. Type of gas and the operating pressure of the appliance.

70
Q

A domestic gas range uses a cap orifice to control the maximum flow rate to each top burner. If the hood is screwed up tight until the needle blocks off the orifice in the hood, the orifice will be adjusted to deliver the correct volume of:

A. Propane to each pilot and top burner.

B. Propane to each top burner[][][][][][][][][]

C. Natural Gas to each pilot and tap burner.

D. Natural Gas to each main burner[][][][][][][]

A

B. Propane to each top burner.

71
Q

Which of the following orifices will pass the most fuel gas per hour?

A. A #30 orifice with a 0.8 K-factor.

B. A #30 orifice with a 0.9 K-factor.

C. A #31 orifice with a 0.8 K-factor.[]

D. A # 31 orifice with a 0.9 K-factor.

A

B. A #30 orifice with a 0.9 K-factor.

The smaller the orifice number, the larger the openinig. The higher the K-factor, the more efficient it is, so the higher the flow rate.

72
Q

If the cross-sectional area of an orifice is doubled, then the flow rate is increased by:

A. 50 percent of the original flow rate.

B. 2 times the original flow rate[][][][][][]]

C. 4 times the original flow rate[][][][][][]]

D. Twice the square root of the area change.

A

B. 2 times the original flow rate.

73
Q

An orifice at 2 inches of water column will deliver 50 cubic feet of Natural Gas. If the burner is redesigned to deliver 100 cubic feet of gas, the manifold pressure will have to be increased to:

A. 4 inches w.c.

B. 6 inches w.c.

C. 8 inches w.c.[]

D. 10 inches w.c.

A

C. 8 inches w.c.

You will have to increase the pressure by 4 times to double the gas flow.

74
Q

The designation A in the orifice formula stands for:

A. Ambient temperature.

B. Area in square inches.

C. Area in square feet[][][]]

D. Absolute pressure[][][][]

A

B. Area in square inches.

75
Q

The figure below is a:

A. Cap orifice.

B. Fixed orifice.

C. Pilot orifice[]]

D. Spud orifice.

A

A. Cap orifice.

76
Q

The figure below is a:

A. Cap orifice.

B. Fixed orifice.

C. Hi altitude orifice.

D. Spud orifice[][][][][]

A

D. Spud orifice.

77
Q

True or False.

A portable propane cylinder must undergo physical examination every time it is filled.

A

True.

78
Q

Portable propane cylinder relief valves must be recertified or replaced every:

A. Year.

B. 2 years.

C. 5 years[]

D. 10 years.

A

D. 10 years.

Course L (30 decks)

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