080203aA

Question 1

What is the typical pressure of low pressure natural gas? What is its maximum allowable pressure drop?

Answer 1

7”-14” w.c.

1” w.c. Maximum pressure drop

Question 2

What is the maximum pressure between the first and second stage regulator on a propane system?

Answer 2

10 psi

Question 3

What is the typical pressure of low pressure propane? What is its maximum allowable pressure drop?

Answer 3

11” w.c.

1” w.c. maximum pressure drop

Question 4

If a gas installation cannot provide enough gas to an additional appliance, and upsizing the excising gas main is not practical, what may be a solution?

Answer 4

A new branch may be installed as long as it is with 24” of the meter outlet

Question 5

Can material that has been used on previous gas installations be reused?

Answer 5

Yes, provided it has been cleaned, inspected and ascertained to be equivalent to new material by the person doing the work

Question 6

Threaded SCH40 steel gas pipe is rated for what maximum pressure?

Answer 6

125 psi

Question 7

What is the maximum pressure allowed on standard malleable (class 150) fittings?

Answer 7

125 psi

Question 8

What is the maximum pressure allowed on malleable iron (class 300) fittings?

Answer 8

300 psi

Question 9

When brazing copper tubing, what must the melting point of the brazing alloys be?

Answer 9

1000°F

Question 10

When using compression fittings with ferrules on copper tubing, what provision must be made?

Answer 10

Must use a double ferrule system

Question 11

All fittings used on copper gas line installations must be pressure rates for…

Answer 11

125 psi

Gas pressures about 125 psi require fittings designed for 250 psi

Question 12

Name the copper types that may be used…

Answer 12

Above Ground
K, L, G

Underground
K

Types L and G are approved for underground only if they have been factory-coated with a PVC resin or extruded polyethylene

Question 13

What is the only approved plastic pipe for gas?

Answer 13

Polyethylene

Question 14

Where is the only place plastic polyethylene gas pipe may be installed?

Answer 14

Outdoors underground

Question 15

Polyethylene is not conductive. What must be done in order to be able to locate it once it is burried?

Answer 15

14 gauge tracer wire

Question 16

Where must polyethylene not be used in regards to propane?

Answer 16

Liquid propane installations

Cannot be used for the first 10’ downstream of a propane vaporizer

Question 17

The minimum rated working pressure for a hose and hose fittings is?

Answer 17

350 psi

Question 18

What is the maximum length of a hose on a permanent installation?

Answer 18

10’

Question 19

What is the minimum/maximum length of a hose on a construction heater?

Answer 19

15’ min

75’ max

Question 20

What is the maximum length of a hose on a portable appliance (barbecue)?

Answer 20

30’

Question 21

A hose should not be subject to temperatures exceeding?

Answer 21

125°F (50°C)

Question 22

A hose used on an infrared tube heater must be how long?

Answer 22

36” long + or - 6”

Question 23

CSST(Gas tite) and tubing that are run inside a wall must be protected from damage by what?

Answer 23

16 gauge metal protection plates

Question 24

What is the largest size of gas line that may be threaded?

Answer 24

2”

Question 25

How many sizes must you reduce when using malleable bushings?

Answer 25

2 or more sizes

Question 26

What is the maximum length of a flex connector on a vented appliance?

Answer 26

2’

Question 27

What is the maximum length of a flex connector on an unvented appliance?

Answer 27

6’

Question 28

Can you pass through a wall, ceiling, floor or partition with a flex connector?

Answer 28

No this is not permitted

Question 29

How much unthreaded pipe must be exposed when it protrudes through a ceiling or wall?

Answer 29

At least 1”

Question 30

How much unthreaded pipe must be exposed when it protrudes through a floor?

Answer 30

At least 2”

Question 31

All gas lines must be buried at least how deep?

Answer 31

15” 24” for commercial installations where a gas line traverses a driveway or parking lot

Question 32

Gas lines that are covered with concrete or paving what extends horizontally more than ___ over the line require what?

Answer 32

25’ Must have a vent/inspection point provided

Question 33

Commercial buildings require colour coding markings how often?

Answer 33

Every 20’

Question 34

Copper tubing installed in a residential application must have yellow bands every how many feet?

Answer 34

6’

Question 35

Residential appliances may have the gas cock installed on the horizontal finish piping as long as is located within...

Answer 35

2’ of the appliance

Question 36

How far away may the gas cock be located from an appliance?

Answer 36

Up to 50’ away as long as it is accessible and clearly tagged

Question 37

What kind of valves must be used on gas piping or tubing 1” and larger and where gas pressure exceeds 0.5psig?

Answer 37

Ball valves, eccentric valves or lubricated plug valves

Question 38

What page in the gas code can you find hanger spacing?

Answer 38

Pg.43