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Lvl.4 Gas - Exam #1 > Piping > Flashcards

Piping Flashcards

1
Q

Which of the following piping materials cannot be used in gas piping systems?

a) Steel
b) Copper
c) Lead
d) Plastic

A

c)

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2
Q

Steel or malleable iron fittings may be used with steel pipe. True or False?

A

True

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3
Q

You cannot use type ________ copper tubing in gas systems, as its wall thickness is slightly less than that of type G tubing

a) K
b) L
c) M

A

M

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4
Q

How shall piping be sized?

a) To meet the volume and pressure requirements at the point of use.
b) To meet the pressure requirements at the point of use.
c) To meet the volume requirements at the point of use.
d) According to the appliance manufacturers installation manual.

A

a)

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5
Q

What is the maximum allowable pressure drop on a piping system that has a natural gas supply pressure of 7 in w.c. to 14 in w.c.?

a) .5 inch w.c.
b) 1 inch w.c.
c) 50%

A

b)

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6
Q

How shall the gas pressure requirements for an appliance be determined?

a) Pipe sizing tables
b) Provincial regulations
c) Appliance rating plate or from the appliance manufacturer

A

c)

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7
Q

How shall an extension of an existing piping or tubing system be sized?

a) Sized to meet the load demand of the extended piping system
b) Sized to meet the requirements of Clause 6.3 of CSA B149.1
c) Sized to meet the requirements of Clause 5.2 of CSA Z662

A

b)

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8
Q

What is the maximum pressure drop allowed on a piping system that has a natural gas supply pressure less than 7 in w.c.?

1 inch w.c.
0.5 inch w.c.
1.5 inches w.c
2 inches w.c

A

b)

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9
Q

How shall the volume of gas to an appliance be determined?

a) From either the rating plate or the appliance manufacturer
b) By the size of the piping system the appliance is connected to
c) According to provincial regulations

A

a)

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10
Q

Must the ends of all piping be reamed?
Yes
No

A

yes

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11
Q

What is the maximum spacing of supports for 1 in horizontal piping?
12 ft
6 ft
8 ft
16 ft

A

8 ft

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12
Q

What diameters of piping require welded joints?

Diameters NPS 2-1/2 and larger
Diameters NPS 4 and larger
Diameters NPS 2-1/4 and larger
Diameters NPS 4-1/2 and larger

A

2-1/2 and larger

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13
Q

May a copper joint be made with brazing material that has a melting temperature exceeding 1000°F (537 °C)?
Yes
No

A

yes

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14
Q

During a period when a piping outlet to an appliance is not connected to the appliance, how shall it be made tight?

a) A piping outlet must always be connected to an appliance.
b) By means of a plugged valve or either a cap or plug made of a material compatible with the piping or tubing system.

A

b)

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15
Q

Complete the following sentence:
A __________ is an area in a piping system that collects condensate and from which you can remove the
condensate.

Drip pocket
Dirt pocket
Collection pocket

A

drip pocket

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16
Q

What is the minimum diameter of piping that can be installed underground?

a) NPS 3/4
b) NPS 3/8
c) NPS 1/2

A

NPS 1/2

17
Q

How shall the gas supply to an underground plastic pipe or tubing be controlled?

a) By a shut-off valve situated above ground
b) By a regulator

A

a)

18
Q

May a vented appliance be connected with a hose?
Yes
No

A

no

19
Q

May a connector be used to connect a mobile home?

Yes, where the mobile home is not on a permanent foundation
No

A

a)

20
Q

What are the pressure test requirements for a 250 ft (76 m) natural gas piping system with a working pressure of 2 psig?

15 psig for 30 minutes
15 psig for 60 minutes
60 psig for 15 minutes

A

b)

21
Q

What are the minimum test requirements for all wrapped or factory-coated piping?

a) 100 psig and 15 minutes
b) 100 psig and 60 minutes
c) 100 psig and within the time duration required of Table 6.3, Note 2

A

c)

22
Q

May rooftop piping be supported with treated wood blocks?
Yes
No

A

yes

23
Q

May plastic pipe be used on liquid propane system?
Yes
no

A

no

24
Q

When may piping less than NPS 1/2 be used indoors?

On a propane branch line not exceeding 15 ft in length
On a propane branch line not exceeding 25 ft in length
Piping less than NPS 1/2 cannot be used indoors

A

On a propane branch line not exceeding 15 ft in length

25
Q

May propane piping or tubing be supported by other piping or tubing?

Yes, providing the piping is less than NPS ¾
No

A

no

26
Q

What is the required diameter of a dirt pocket used on propane systems?

a) The diameter shall be NPS 2 or equal to the diameter it serves whichever is the lesser.
b) The diameter shall be NPS 2 or equal to the diameter it serves whichever is the greater.

A

a) The diameter shall be NPS 2 or equal to the diameter it serves whichever is the lesser.

27
Q

May a close nipple be used on a propane piping system?
Yes
No

A

no

28
Q

Complete the following sentence:
When tubing runs horizontally across studs notched to accommodate the tubing, it must be protected where it crosses each stud by a __________________.
12-gauge (USG) steel plate
16-gauge (USG) steel plate
14-gauge (USG) steel plate
18-gauge (USG) steel plate

A

16 gauge

29
Q

What is the maximum interval that propane tubing can be run inside a residential occupancy without identification?
6 ft
12 ft
3 ft
24 ft

A

6ft

30
Q

Where must the shut-off valves be placed if propane piping or tubing is extended from one building to another?

At the exit of the first building.
At the point of entry to the second building.
One at the exit of the first building and another at the point of entry to the second building.

A

one at exit of first building and another at entry of second building

31
Q

What is the required test pressure of a propane piping system 50 ft long with a working pressure of 10 psig?

50 psig for 60 minutes
50 psig for 180 minutes
15 psig for 180 minutes

A

a)

32
Q

Is an individual shut-off valve required for all propane appliances on a recreational vehicle?
Yes
No

A

no

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

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