Brainscape's Knowledge GenomeTM


Top Flashcards (Certified)
All Flashcards

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

Note's Flashcards

(54 cards)

Start Studying
1
Q

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

A

be trained and competent

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
4
Q

What is the usual temperature and pressure relief valve setting?

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

A

c)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
6
Q

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

A

no valve at all

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
10
Q

What pressure is a propane cylinder safety valve set at?

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

A

d)

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
11
Q

Propane produces ___ft3 of air per 1ft3 fuel

A

25

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
12
Q

Natural gas produces ___ft3 of air per 1ft3 fuel

A

10

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
13
Q

Calorific value of natural gas?

A

1000btuh

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
14
Q

Calorific value or propane?

A

2520btuh

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
15
Q

Expansion ratio of propane

A

1:270

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
16
Q

Expansion ratio of natural gas

A

1:600

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
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
How well did you know this?
1
Not at all
2
3
4
5
Perfectly
18
Q

ASME stands for?

A

American society of mechanical engineers

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
19
Q

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

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
20
Q

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

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
21
Q

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

A

True

How well did you know this?
1
Not at all
2
3
4
5
Perfectly
22
Q

Depth of dirt or drip pocket is?

23
Q

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

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

25
What is the air to fuel ratio required to achieve stoichiometric combustion? a) 1:1 b) 2:1 c) 5:1 d) 10:1
d)
26
What is the yield formula for the stoichiometric combustion of methane?
= 1,2,8
27
Why is digester gas considered a renewable resource? a) it does not cost any money to make b) generates no net co2
b)
28
Propane-Air systems do not require additional gas trains, piping, or special fuel delivery systems within the building it serves. True or False?
True
29
All combustion chambers are suitable for alternate fuel combustion. True or False?
False
30
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
c)
31
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
c)
32
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)
33
When piping a gas supply system of 5psi and up. What calculation must be considered?
Friction loss of fittings
34
Minimum gas pressure for propane?
1.5''
35
Minimum gas pressure for natural gas?
3.5''
36
Why are vacuum reliefs on tanks required?
To prevent an extreme vacuum from a fire truck hook-up
37
Draft hood appliance requires a total of ___ft3
30ft3
38
Draft hood requires __ft3 for combustion and __ft3 for the draft hood
15ft3 and 15f3 for a total of 30ft3
39
Purpose of a draft hood is to provide air to mix with ____ gases and reduce the speed of them and reduce _________
flue gases, condensation
40
Speed of flue gas is _______ to speed of fresh air pulled in
inverse
41
Considerations when selecting OPPD? (3)
1. Continuity - how important is gas interruption 2. Where - where will gas relief 3. Failure - how is failure detected
42
Name four types of OVER PRESSURE PROTECTION
1. monitoring 2. pressure relief 3. series regulation 4. overpressure cut-off
43
When inlet pressure on the first regulator exceeds downstream pressures, you must have _________ ________ installed
over pressure protection
44
_______ valve is considered the most reliable type of OPPD
Relief valve
45
Why are relief valves considered the most reliable type of OPPD? (3)
1. do not block flow 2. do not decrease capacities of regs 3. alarm if they vent to atmosphere
46
Name 4 types of relief valves
1. pop type 2. direct operated 3. pilot operated 4. internal relief
47
Vent limiters must be installed ______
upright
48
Vent limiters replace regulator _______ in certain situations
regulator venting
49
Vent limiters allow a slow escape of gas if the ________ rips
diaphragm
50
Vent limiters can only be installed ?
indoors
51
Surge arrestors are also known as ?
vent stabilizer or flapper assembly
52
Surge arrestors protect the regulator from?
Increased outside pressures pushing down on the diaphragm
53
Surge arrestors allow air to move _______ and allows gas to escape if necessary
freely
54

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

Brainscape helps you reach your goals faster, through stronger study habits.
© 2025 Bold Learning Solutions. Terms and Conditions