Gas Line Sizing

Question 1

What is the supply pressure for natural gas

Answer 1

7” to 14” wc

Question 2

What is the supply pressure for propane

Answer 2

11” wc

Question 3

• Do The gas line sizing tables refer to the smallest possible size or biggest possible size of gas line you should use

Answer 3

Smallest

Question 4

If your pressure drop is to great you hat do you need to do

Answer 4

Install a larger line

Question 5

What unit of measurement are all the tables in

Answer 5

Metric

Question 6

threaded pipe for natural gas must not be smaller than ———inch diameter unless it’s schedule ————

Answer 6

1/2 diameter
Sched 80

Question 7

a gas line for additional appliances may be installed connecting within ———-inches of the meter outlet, system or secondary regulator

Answer 7

24 inches

Question 8

What types of copper are approved for use above ground

Answer 8

K,G,L

Question 9

• Types l and g are approved for use underground only if they have been what ?

Answer 9

factory coated with a pvc resin or extruded polyethylene

Question 10

• Plastic pipe shall not be used for liquid propane installations, nor can it be used for the first 10 feet downstream of a propane vaporizer T or F

Answer 10

True

Question 11

• steel bushings may reduce one or more sizes as they have high structural strength and are not weakened by having a thin wall when reduced by one size. Malleable bushings are not as strong as steel therefore they must reduce two or more sizes true or false

Answer 11

True

Question 12

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

Answer 12

2 feet

Question 13

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

Answer 13

6 feet

Question 14

• Connectors shall be protected from damage and cannot pass through a wall, ceiling or floor
  T OR f

Answer 14

True

Question 15

• Gas lines that are painted other than yellow require indentification with what

Answer 15

Labels every 20 ft

Question 16

• Steel pipe used in residential applications does not require identification, as nothing but gas uses steel pipe in a house

T OR f

Answer 16

True

Question 17

Copper tubing installed in a residential application must have what

Answer 17

yellow bands at 6’ intervals through the entire length

Question 18

Can you have a gas valve installed on the horizontal finish piping

Answer 18

Yes as long as it’s located within 2 ft of the appliance

Question 19

Whats the maximum distance a gas valve can be located away from the appliance under what circumstances

Answer 19

50 ft as long as it’s clearly tagged and accessible

Question 20

What is the preferred piping practice when installing a gas valve for an appliance

Answer 20

Installing it on the drop or riser

Question 21

• a gas line must not be supported by another pipe or by the appliance it’s serving
  True or False

Answer 21

True

Question 22

• All gas lines should be supported on the horizontal portion at the drop or rise
  True or false

Answer 22

True

Question 23

What is the hanger spacing for
1/2”
3/4-1”
1 1/4- 2 1/2”

Answer 23

6
8
10

Question 24

What is the hanger spacing for tubing

Answer 24

6 ft

Question 25

You just obtain a permit before any gas installation is carried out
T OR f

Answer 25

True