Liquefied Petroleum Systems ( LP )

Question 1

Compression fittings are not______.

Answer 1

Permitted

Question 2

Steel fittings must be_____.

Answer 2

Zinc coated

Question 3

Brass fittings must be ________.

Answer 3

Forged

Question 4

Pipe fittings must be _______.

Answer 4

Black iron

Question 5

Black iron pipe should be ______.

Answer 5

•Schedule 40 for vapor
• Schedule 80 for liquid.

Question 6

What is the function of a regulator?

Answer 6

• 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.

Question 7

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

Answer 7

45°

Question 8

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

Answer 8

Regulators

Question 9

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

Answer 9

Metal or plastic cover

Question 10

What is the system working pressure?

Answer 10

11 inches WC
WC= Water Column
Measured with a manometer

Question 11

What is the maximum allowed static pressure?

Answer 11

14 inches WC
WC=Water Column

Question 12

Regular first stage reduces tank pressure to approximately what PSI?

Answer 12

10PSI

Question 13

Second stage reduces the pressure to _____ water column.

Answer 13

11 inches WC

Question 14

Appliance regulators are set at ______

Answer 14

10-10.5” WC

Question 15

Dial type manometers should be regularly calibrated by a ______.

Answer 15

U-tube manometer

Question 16

RV systems are adjusted to ______ water column.

Answer 16

Inches

Question 17

What does a manometer do?

Answer 17

Measures pressure in inches of water column

Question 18

What do technicians use manometers for?

Answer 18

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

Question 19

Regulators must be mounted with the vent _______ from horizontal.

Answer 19

45° or more from horizontal.

Question 20

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

Answer 20

The service and reserve cylinders are mounted on the RV.

Question 21

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

Answer 21

2 stage type.

Question 22

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

Answer 22

Working pressure

Question 23

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

Answer 23

Pressure and a Spring.

Question 24

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

Answer 24

Regulate the propane system pressure.

Question 25

What happens if either atmospheric pressure or spring pressure increases?

Answer 25

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

Question 26

What will reducing atmospheric or spring pressure do?

Answer 26

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

Question 27

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

Answer 27

Two propane cylinders.

Question 28

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

Answer 28

Open

Question 29

Steps for a leak test using automatic change over regulator.

Answer 29

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.)

Question 30

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

Answer 30

An electronic leak detector or leak detection fluid.

Question 31

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

Answer 31

Ethyl Mercaton is added at 0.48%.

Question 32

What WHMIS symbols are found on large propanes cylinders.

Answer 32

Question 33

Propane is a bi-product of?

Answer 33

Petroleum refining and natural gas processing.

Question 34

Propane expands in volume at a rate of ______.

Answer 34

270 times when changing from a liquid to a vapor.

Question 35

What does OPD Stand for?

Answer 35

Overfill safety device.

Question 36

Propane is _________.

Answer 36

Non corrosive

Question 37

ASME Tanks are inspected every_____ years

Answer 37

5 years

Question 38

TC cylinders are recertified every ______ years.

Answer 38

10 years

Question 39

Cylinders must be mounted to withstand _____ their loaded mass.

Answer 39

8x

Question 40

Why do we have to purge?

Answer 40

To get rid of contaminants.

Question 41

What should you never vacuum purge?

Answer 41

A used container.

Question 42

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

Answer 42

Full containers, which is 80% capacity.

Question 43

What should you always purge with?

Answer 43

Vapor propane

Question 44

What is the refrigeration effect?

Answer 44

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 )

Question 45

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

Answer 45

Kilograms 1 liter = 1kg

Question 46

What does air or moisture in a container do?

Answer 46

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

Question 47

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

Answer 47

Oxygen, fuel and heat.

Question 48

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

Answer 48

375 PSI TC Cylinders 312.5 PSI ASME Tanks

Question 49

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

Answer 49

80%

Question 50

What type of fire extinguisher is used for propane?

Answer 50

Class A

Question 51

Liquid propane weight is?

Answer 51

0.5 of water 0.504 specific gravity

Question 52

What is pascals law?

Answer 52

Pressure is equal and undiminished in all directions.

Question 53

What causes pressure to increase and decrease?

Answer 53

Changing temperature

Question 54

What is boyles law?

Answer 54

Pressure is related to temperature when the volume is constant

Question 55

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

Answer 55

To allow for 20% of vapor space for expansion.

Question 56

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

Answer 56

127 psi

Question 57

Propane is ____ in pure state.

Answer 57

Odorless

Question 58

The specific gravity of liquid propane is...

Answer 58

0.504

Question 59

Propane gas specific gravity is...

Answer 59

1.50

Question 60

What is the chemical makeup of propane?

Answer 60

Question 61

What is the chemical makeup of butane?

Answer 61

C⁴H¹⁰

Question 62

What is the boiling point of propane?

Answer 62

−42°C ( -44°F )

Question 63

What is the boiling point of butane?

Answer 63

0°C (32°F)

Question 64

What is the combustibility range of propane?

Answer 64

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

Question 65

Propane auto Ignition temperature.

Answer 65

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

Question 66

What is the propane flash point?

Answer 66

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

Question 67

Propane maximum flame temperature.

Answer 67

1979°C ( 3595°F )

Question 68

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

Answer 68

Ethyl Mercaptan

Question 69

Propane is detectable at?

Answer 69

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

Question 70

How much does propane expand when changing to vapor state?

Answer 70

It expands 270 times in volume.

Question 71

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

Answer 71

1.5% for every 10°F it is warmed

Question 72

Propane is stored in...

Answer 72

A liquid state.

Question 73

Propane is used in?

Answer 73

A vapor state

Question 74

How many pounds is it per US gallon of propane?

Answer 74

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

Question 75

How many BTUs does one gallon of propane contain?

Answer 75

91,502 BTUs

Question 76

Propane is a ____________ with the formula _____.

Answer 76

Hydro carbon C³H⁸

Question 77

Propane is a ____________.

Answer 77

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

Question 78

What must be upstream of a quick disconnect device?

Answer 78

Manual shut off valve

Question 79

What is the flamability rate of propane?

Answer 79

2.4% - 9.5%.

Question 80

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

Answer 80

200 cfh at 100 psi

Question 81

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

Answer 81

A single backflow check valve

Question 82

A back flow preventor in the philva must have______.

Answer 82

A double backflow check valve.

Question 83

B L E V E

Answer 83

Boiling Liquid Expanding Vapor Explosion

Question 84

Are pressure relief valves adjustable?

Answer 84

No

Question 85

What is a site gauge on an ASME tank?

Answer 85

It is only an approximate indicator of level.

Question 86

What are 2 types of liquid level gauge?

Answer 86

1) Fixed maximum liquid level gauge 2) Sight gauge

Question 87

Current valves use a ___________.

Answer 87

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

Question 88

Both liquid level valves have______.

Answer 88

#54 Drilled orifice

Question 89

Tc cylinder release valve pressure rating is.

Answer 89

3 70 5 PSI