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RV PERIOD 1 > Liquefied Petroleum Systems ( LP ) > Flashcards

Liquefied Petroleum Systems ( LP ) Flashcards

1
Q

Compression fittings are not______.

A

Permitted

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2
Q

Steel fittings must be_____.

A

Zinc coated

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3
Q

Brass fittings must be ________.

A

Forged

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4
Q

Pipe fittings must be _______.

A

Black iron

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5
Q

Black iron pipe should be ______.

A

•Schedule 40 for vapor
• Schedule 80 for liquid.

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6
Q

What is the function of a regulator?

A

• Reduces variable high pressure to a usable working pressure
• First stage reduces container pressure to 10psi
• Second stage reduces first stage pressure to a working pressure.

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7
Q

The main regulator must be mounted with the vent _____ degrees from horizontal.

A

45°

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8
Q

What should not be attached directly to the propane cylinder shut off valve valve?

A

Regulators

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9
Q

The CSA Z240 code book requires that the regulatory shall be protected by a ____ or ____ cover.

A

Metal or plastic cover

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10
Q

What is the system working pressure?

A

11 inches WC
WC= Water Column
Measured with a manometer

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11
Q

What is the maximum allowed static pressure?

A

14 inches WC
WC=Water Column

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12
Q

Regular first stage reduces tank pressure to approximately what PSI?

A

10PSI

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13
Q

Second stage reduces the pressure to _____ water column.

A

11 inches WC

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14
Q

Appliance regulators are set at ______

A

10-10.5” WC

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15
Q

Dial type manometers should be regularly calibrated by a ______.

A

U-tube manometer

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16
Q

RV systems are adjusted to ______ water column.

A

Inches

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17
Q

What does a manometer do?

A

Measures pressure in inches of water column

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18
Q

What do technicians use manometers for?

A

To correctly adjust the main regulator pressure and leak test system.

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19
Q

Regulators must be mounted with the vent _______ from horizontal.

A

45° or more from horizontal.

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20
Q

CSA Z240 code book requires that an auto change over regulator must be installed if _____.

A

The service and reserve cylinders are mounted on the RV.

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21
Q

CSA Z240 states that the main regulator must be of the _____ complying to UL standards.

A

2 stage type.

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22
Q

Using a 2 stage, regulator enables more consistent control of the______.

A

Working pressure

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23
Q

Propane vapor pushes against a diaphragm that acts against atmospheric what?

A

Pressure and a Spring.

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24
Q

As the diaphragm moves up-and-down, it controls a lever that opens and closes a valve to______.

A

Regulate the propane system pressure.

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25
Q

What happens if either atmospheric pressure or spring pressure increases?

A

The system pressure will increase because it takes more propane pressure, to overcome the different pressure and close the valve.

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26
Q

What will reducing atmospheric or spring pressure do?

A

It will decrease system pressure because of the reduced force required to close the valve.

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27
Q

An automatic change over regulator is a 2 stage regulator designed to be used with what?

A

Two propane cylinders.

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28
Q

Both cylinder valves should be _____ when using an auto change over regulator.

A

Open

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29
Q

Steps for a leak test using automatic change over regulator.

A

1) Ensure all appliances are turned off.
2) Open the service cylinder to pressure the system and then close it.
3) The indicator should stay green if no leaks are present.
4) Wait 10 minutes and recheck to ensure the indicator does not change to red.
( Change to red would mean a loss of pressure indicating a leak.)

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30
Q

What equipment do you need to conduct a leak test and identify the leak location?

A

An electronic leak detector or leak detection fluid.

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31
Q

What is added to propane to produce a rotten egg smell?

A

Ethyl Mercaton is added at 0.48%.

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32
Q

What WHMIS symbols are found on large propanes cylinders.

A
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33
Q

Propane is a bi-product of?

A

Petroleum refining and natural gas processing.

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34
Q

Propane expands in volume at a rate of ______.

A

270 times when changing from a liquid to a vapor.

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35
Q

What does OPD Stand for?

A

Overfill safety device.

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36
Q

Propane is _________.

A

Non corrosive

37
Q

ASME Tanks are inspected every_____ years

A

5 years

38
Q

TC cylinders are recertified every ______ years.

A

10 years

39
Q

Cylinders must be mounted to withstand _____ their loaded mass.

A

8x

40
Q

Why do we have to purge?

A

To get rid of contaminants.

41
Q

What should you never vacuum purge?

A

A used container.

42
Q

What increases the “wetted surface” and can help with vaporization in cold weather?

A

Full containers, which is 80% capacity.

43
Q

What should you always purge with?

A

Vapor propane

44
Q

What is the refrigeration effect?

A

When the rate of vaporization can be exceeded. When the fuel has been refrigerated from vaporization to the point that there is little container pressure. ( more common in cold temperatures )

45
Q

Multiply water capacity in liters by 0.42 to get propane capacity in_______.

A

Kilograms
1 liter = 1kg

46
Q

What does air or moisture in a container do?

A

It absorbs the ethyl mercaptan, which makes propane leaks hard to detect.
• Moisture can lead to rusting
• Air can cause appliance problems.

47
Q

What are the 3 elements required to start and sustain propane combustion?

A

Oxygen, fuel and heat.

48
Q

What is the PSI for relief valves on TC cylinders and ASME tanks?

A

375 PSI TC Cylinders
312.5 PSI ASME Tanks

49
Q

Cylinders must not be filled to more than what of their total capacity?

A

80%

50
Q

What type of fire extinguisher is used for propane?

A

Class A

51
Q

Liquid propane weight is?

A

0.5 of water
0.504 specific gravity

52
Q

What is pascals law?

A

Pressure is equal and undiminished in all directions.

53
Q

What causes pressure to increase and decrease?

A

Changing temperature

54
Q

What is boyles law?

A

Pressure is related to temperature when the volume is constant

55
Q

Why is the propane cylinder/tank filled to only 80% of its capacity?

A

To allow for 20% of vapor space for expansion.

56
Q

Vapor pressure at 21°C ( 70°F ) is____PSI.

A

127 psi

57
Q

Propane is ____ in pure state.

A

Odorless

58
Q

The specific gravity of liquid propane is…

A

0.504

59
Q

Propane gas specific gravity is…

A

1.50

60
Q

What is the chemical makeup of propane?

A
61
Q

What is the chemical makeup of butane?

A

C⁴H¹⁰

62
Q

What is the boiling point of propane?

A

−42°C ( -44°F )

63
Q

What is the boiling point of butane?

A

0°C (32°F)

64
Q

What is the combustibility range of propane?

A

2.4 % to 9.5% propane.
97.6% to 90.5% air

65
Q

Propane auto Ignition temperature.

A

540°C ( 1004°F )
Temperature at which it may spontaneously ignite without an Ignition source.

66
Q

What is the propane flash point?

A

-104°C (-156°F)
Lowest temperature vapors will ignite with an ignition source.

67
Q

Propane maximum flame temperature.

A

1979°C ( 3595°F )

68
Q

What is added as an odorant to act as a warning agent?

A

Ethyl Mercaptan

69
Q

Propane is detectable at?

A

1/5th of the lower flammability level.
( .48% )

70
Q

How much does propane expand when changing to vapor state?

A

It expands 270 times in volume.

71
Q

How much does propane expand for every 10°F it is warmed?

A

1.5% for every 10°F it is warmed

72
Q

Propane is stored in…

A

A liquid state.

73
Q

Propane is used in?

A

A vapor state

74
Q

How many pounds is it per US gallon of propane?

A

4.2 pounds per US gallon of propane.
20 pounds of propane = 4.8 US gallons.
30 pounds of propane = 7.2 US gallons.

75
Q

How many BTUs does one gallon of propane contain?

A

91,502 BTUs

76
Q

Propane is a ____________ with the formula _____.

A

Hydro carbon
C³H⁸

77
Q

Propane is a ____________.

A

Gas at a standard ambient temperature in pressure.
( 25°C at standard atmospheric pressure )

78
Q

What must be upstream of a quick disconnect device?

A

Manual shut off valve

79
Q

What is the flamability rate of propane?

A

2.4% - 9.5%.

80
Q

The CSA Z240 code book requires that an excess flow valve not exceed what?

A

200 cfh at 100 psi

81
Q

Backflow preventer at a remote fill is only required to be _______.

A

A single backflow check valve

82
Q

A back flow preventor in the philva must have______.

A

A double backflow check valve.

83
Q

B
L
E
V
E

A

Boiling
Liquid
Expanding
Vapor
Explosion

84
Q

Are pressure relief valves adjustable?

A

No

85
Q

What is a site gauge on an ASME tank?

A

It is only an approximate indicator of level.

86
Q

What are 2 types of liquid level gauge?

A

1) Fixed maximum liquid level gauge
2) Sight gauge

87
Q

Current valves use a ___________.

A

1-5/16” ACME Thread hand tightened connection.

88
Q

Both liquid level valves have______.

A

54 Drilled orifice

89
Q

Tc cylinder release valve pressure rating is.

A

3 70 5 PSI

RV PERIOD 1 (10 decks)

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