Gas Line Sizing Flashcards
What is the supply pressure for natural gas
7” to 14” wc
What is the supply pressure for propane
11” wc
- Do The gas line sizing tables refer to the smallest possible size or biggest possible size of gas line you should use
Smallest
If your pressure drop is to great you hat do you need to do
Install a larger line
What unit of measurement are all the tables in
Metric
threaded pipe for natural gas must not be smaller than ———inch diameter unless it’s schedule ————
1/2 diameter
Sched 80
a gas line for additional appliances may be installed connecting within ———-inches of the meter outlet, system or secondary regulator
24 inches
What types of copper are approved for use above ground
K,G,L
- Types l and g are approved for use underground only if they have been what ?
factory coated with a pvc resin or extruded polyethylene
- 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
True
- 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
True
What is the maximum length of a flex connector on a vented appliance
2 feet
What is the maximum length of a flex connector on an un vented appliance
6 feet
- Connectors shall be protected from damage and cannot pass through a wall, ceiling or floor
T OR f
True
- Gas lines that are painted other than yellow require indentification with what
Labels every 20 ft
- Steel pipe used in residential applications does not require identification, as nothing but gas uses steel pipe in a house
T OR f
True
Copper tubing installed in a residential application must have what
yellow bands at 6’ intervals through the entire length
Can you have a gas valve installed on the horizontal finish piping
Yes as long as it’s located within 2 ft of the appliance
Whats the maximum distance a gas valve can be located away from the appliance under what circumstances
50 ft as long as it’s clearly tagged and accessible
What is the preferred piping practice when installing a gas valve for an appliance
Installing it on the drop or riser
- a gas line must not be supported by another pipe or by the appliance it’s serving
True or False
True
- All gas lines should be supported on the horizontal portion at the drop or rise
True or false
True
What is the hanger spacing for
1/2”
3/4-1”
1 1/4- 2 1/2”
6
8
10
What is the hanger spacing for tubing
6 ft
You just obtain a permit before any gas installation is carried out
T OR f
True
