4Th Year Gas Theory Review

Front 1

Sch 40 pipe my be used for pressure not exceeding

Back 1

125 psi

Front 2

Every hose and hose fitting shall have a minimum pressure rating of?

Back 2

350 psi

Front 3

Type L and G

Back 3

Outdoor underground service

Front 4

A sleeve must be provided for piping or tubing passes through pavement in order to?

Back 4

Permit the free movement of the piping

Allow venting of gasses to escape from underground leaks

Front 5

Type L and G copper tubing may be used underground when?

Back 5

When Coates by extruded PVC or polyethylene resin

Front 6

Rule of thumb

How is the size of vent connector serving a single appliance determined

Back 6

It’s always the same size as the draft-hood outlet

Front 7

Rule of thumb

How is the size of a vent connector manifold serving more than one appliance determined?

Back 7

It is the combined area of all the outlets

Front 8

Rule of thumb

What is the minimum size of a chimney serving a single appliance

Back 8

One size smaller than the vent connector

Front 9

Where should an air supply duct terminate

Back 9

Next to the burner of the largest input appliance

Front 10

What is the maximum developed length of an air supply duct without increasing the size

Back 10

20’ or 6m

Front 11

What is the minimum size of an opening used for fresh air supply

Back 11

4”

Front 12

What is the minimum height of an air supply inlet above grade level?

Back 12

12”

Front 13

If an appliance were connected to an approved chimney instead of a type B vent what size diameter would the chimney be

Back 13

6”

Front 14

Can a defective section of gas piping or tubing be repaired by a qualified gasfitter

Back 14

No

Front 15

What part of a propane tank may be field-welded

Back 15

Saddle plates or brackets

Front 16

What must be attached to a pressure relief valve installed in a propane tank

Back 16

A lose-fitting rain cap to prevent rain and snow from entering the valve

Front 17

What is the purpose of the internal safety control valve

Back 17

To shut off the flow of propane liquid in case of fire

Front 18

When must a pressure gauge be installed on a propane tank

Back 18

Propane tanks with a capacity over 2000 USWG (7500L)

Front 19

What may not be used to be determine the filling capacity of a propane tank

Back 19

A float gauge

Front 20

What is the maximum size of opening in a spit valve not requiring an excess flow valve

Back 20

#54 orifice drill

Front 21

What is the maximum filling density of a propane tank by volume

Back 21

80% of the water capacity

Front 22

What is the maximum size of a container that can use a spit valve to assist in the filling process

Back 22

5 pounds (2.2 kg) propane capacity

Front 23

What is the minimum distance between a pressure relief valve discharge and building opening below the discharge

Back 23

3’

(1m)

Front 24

What is the minimum distance between a 1500 gallon (5800L) propane tank and a property line

Back 24

10’

(3m)

Front 25

When can a hose be used to connect an unvented appliance?

Back 25

If it’s mobile or requires isolation from vibration

Front 26

What is the minimum distance between 1000 gallon (3800L) propane tank and wood-farmed building

Back 26

10’

(3m)

Front 27

What is the maximum number of supports on a propane tank

Back 27

2 pads or piers

Front 28

What is the minimum required height above grade for a propane tank pad

Back 28

At least 3” (75mm)

Front 29

When using the lifting lugs to move a propane tank, what is the permitted filling density

Back 29

5% water capacity

Front 30

When should a corrugated metal connector not exceed 2’ (600mm) in length

Back 30

When connecting a suspended appliance or a decorative appliance

Front 31

A 3” NPS horizontal gas line must be supported every

Back 31

15’ (4.6m)

Front 32

A swing joint may not be installed where?

Back 32

A concealed location

Front 33

When a piping system is purged outdoors, the purge point must not terminate closer than _____ from the building or air intake?

Back 33

10’ (3m)

Front 34

The maximum range of a test gauge shall exceed the test pressure by ____ but not more than

Back 34

15%

300%

Front 35

What is the main difference between a propane tank and a propane cylinder?

Back 35

The standards and approval agency responsible for certification

Front 36

What is the minimum rated working pressure for a propane tank

Back 36

250 psi

(1725 kPa)

Front 37

How far must weeds and long dry grass or flammable materials be kept clear of a propane tank

Back 37

10’

(3m)