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Lvl.4 Gas - Exam #1 > Note's > Flashcards

Note's Flashcards

1
Q

Any person involved in the installation, removal, repair, inspection, and servicing of a pressure relief device shall?

A

be trained and competent

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2
Q

Which one of the following devices is typically used for steam or vapour service?

a) relief valve
b) safety valve
c) safety relief valve
d) temp and press relief valve

A

b)

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3
Q

Which of the following is typically used for a liquid service?

a) relief valve
b) safety valve
c) safety relief
d) temp and press relief

A

a)

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4
Q

What is the usual temperature and pressure relief valve setting?

a) 150f
b) 180f
c) 210f
d) 212f

A

c)

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5
Q

Safety, safety relief, and relief valves shall be of the

a) direct spring loaded type
b) indirect spring loaded type
c) internally weighted type
d) rupture disc type

A

a)

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6
Q

What type of valve may be installed between a boiler and its relief valve?

A

no valve at all

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7
Q

When a vacuum relief is used for low pressure steam devices a _______ must be installed to prevent live steam from damaging the device?

A

pigtail

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8
Q

What is the LNG secondary relief valve relief pressure set at?

a) same pressure as the MAWP of the tank
b) 1.5 times the MAWP
c) 2 times the MAWP
d) 2.5 times the MAWP

A

b)

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9
Q

What pressures are propane tank safety valves set at?

a) 250 or 312psi
b) 250 or 375psi
c) 295 or 375psi

A

a)

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10
Q

What pressure is a propane cylinder safety valve set at?

a) 250psi
b) 312psi
c) 295psi
d) 375psi

A

d)

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11
Q

Propane produces ___ft3 of air per 1ft3 fuel

A

25

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12
Q

Natural gas produces ___ft3 of air per 1ft3 fuel

A

10

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13
Q

Calorific value of natural gas?

A

1000btuh

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14
Q

Calorific value or propane?

A

2520btuh

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15
Q

Expansion ratio of propane

A

1:270

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16
Q

Expansion ratio of natural gas

A

1:600

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17
Q

Combustion air supplies

  1. comb. air: __ft3/1000btuh
  2. exc. air: __ft3/1000btuh
  3. dil.air: __ ft3/1000btuh
  4. total air: ___ ft3/1000btuh
A
  1. 10
  2. 5
  3. 15
  4. 30
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18
Q

ASME stands for?

A

American society of mechanical engineers

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19
Q

Primary LNG relief is set at the MAWP of the tank. True or False?

A

True

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20
Q

Secondary relief valve is exposed and primary is piped away. True or False?

A

True

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21
Q

Anything over 2 1/2” must be welded. True or False?

A

True

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22
Q

Depth of dirt or drip pocket is?

A

3” minimum

23
Q

Nipple diameter is the diameter of the piping being served or __NPS. Whichever is less

A

2”

24
Q

What are the liquefied petroleum gases (LPG)?

a) butane and air
b) propane and air
c) propane and butane
d) methane and butane

A

c)

25
Q

What is the air to fuel ratio required to achieve stoichiometric combustion?

a) 1:1
b) 2:1
c) 5:1
d) 10:1

A

d)

26
Q

What is the yield formula for the stoichiometric combustion of methane?

A

= 1,2,8

27
Q

Why is digester gas considered a renewable resource?

a) it does not cost any money to make
b) generates no net co2

A

b)

28
Q

Propane-Air systems do not require additional gas trains, piping, or special fuel delivery systems within the building it serves. True or False?

A

True

29
Q

All combustion chambers are suitable for alternate fuel combustion. True or False?

A

False

30
Q

What are all the conditions that must be met to ensure correct application and selection of a conversion burner?

a) fan speed and colour
b) combustion air geometry, fan speed
c) firing rate, combustion chamber geometry, and flue gas travel

A

c)

31
Q

Why is biomass fuel considered to be a renewable energy source?

a) it does not cost any money to make
b) generates an abundance of co2
c) photosynthesis cycles the co2 back into new crops

A

c)

32
Q

If a liner cannot be installed in a masonry chimney, what must be done to accommodate a conversion from oil to natural gas?

a) new venting system must be installed
b) special draft inducer
c) special concrete wash

A

a)

33
Q

When piping a gas supply system of 5psi and up. What calculation must be considered?

A

Friction loss of fittings

34
Q

Minimum gas pressure for propane?

A

1.5’’

35
Q

Minimum gas pressure for natural gas?

A

3.5’’

36
Q

Why are vacuum reliefs on tanks required?

A

To prevent an extreme vacuum from a fire truck hook-up

37
Q

Draft hood appliance requires a total of ___ft3

A

30ft3

38
Q

Draft hood requires __ft3 for combustion and __ft3 for the draft hood

A

15ft3 and 15f3 for a total of 30ft3

39
Q

Purpose of a draft hood is to provide air to mix with ____ gases and reduce the speed of them and reduce _________

A

flue gases, condensation

40
Q

Speed of flue gas is _______ to speed of fresh air pulled in

A

inverse

41
Q

Considerations when selecting OPPD? (3)

A
  1. Continuity - how important is gas interruption
  2. Where - where will gas relief
  3. Failure - how is failure detected
42
Q

Name four types of OVER PRESSURE PROTECTION

A
  1. monitoring
  2. pressure relief
  3. series regulation
  4. overpressure cut-off
43
Q

When inlet pressure on the first regulator exceeds downstream pressures, you must have _________ ________ installed

A

over pressure protection

44
Q

_______ valve is considered the most reliable type of OPPD

A

Relief valve

45
Q

Why are relief valves considered the most reliable type of OPPD? (3)

A
  1. do not block flow
  2. do not decrease capacities of regs
  3. alarm if they vent to atmosphere
46
Q

Name 4 types of relief valves

A
  1. pop type
  2. direct operated
  3. pilot operated
  4. internal relief
47
Q

Vent limiters must be installed ______

A

upright

48
Q

Vent limiters replace regulator _______ in certain situations

A

regulator venting

49
Q

Vent limiters allow a slow escape of gas if the ________ rips

A

diaphragm

50
Q

Vent limiters can only be installed ?

A

indoors

51
Q

Surge arrestors are also known as ?

A

vent stabilizer or flapper assembly

52
Q

Surge arrestors protect the regulator from?

A

Increased outside pressures pushing down on the diaphragm

53
Q

Surge arrestors allow air to move _______ and allows gas to escape if necessary

A

freely

54
Q
A

Lvl.4 Gas - Exam #1 (5 decks)

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