Natural Gas Flashcards
Where is natural gas found and in what form is found?
Underground
Gaseous
What is natural gas composed of?
85% methane 11% ethane 2% nitrogen 1% carbon dioxide 1% other gases ( sulfur, propane, butane, oxygen, helium)
What are the characteristics of natural gas?
Colorless
Odorless
Non-toxic
Why does natural gas smell?
Ethyl Mercaptan is added to give the gas a rotten egg smell
What is the vapor density of natural gas?
.65
What is the vapor density propane?
1.55
What is the vapor density of butane?
2.0
What is the vapor density of ether?
2.55
What is the ignition temperature of natural gas?
1200°F
What is the ignition temperature of propane?
950°F
What is the ignition temperature of butane?
900°F
Was the ignition temperature of ether?
365°F
What is the LEL/UEL of natural gas?
4% – 14%
What is the LEL/UEL of propane?
2.4% – 9.5%
What is the LEL/UEL of butane?
1.8% – 8.4%
What is the LEL/UEL of ether?
1.9% – 48
Where does Southwest Gas distribute natural gas to customers?
Arizona
California
Nevada
High-pressure mains carry gas up to ____ psi
1000 psi
Southwest Gas considers any line over ___ psi to be high-pressure
60 psi
Regulation stations reduce high pressures from mains down to ___–___psi
30 – 60 psi
What psi do distribution lines to home flow at?
30 – 60 psi
What is a residential regulator?
Same thing as a gas meter
A residential regulator/gas meter drops pressures to what PSI as it enters the home?
1/4 psi
Some appliances in the home then regulate that pressure down to 1/8 psi
Water the two materials that gas pipes can be made out of?
Steel
Polyethylene
Gas pipes different sizes and colors and may have a ____ to protect actual line
Sheath
TFD and SWG have a good ____ ____
Working relationship
Who ultimately has the authority at an incident involving a gas leak?
TFD
What will TFD do while Southwest Gas employees are on scene?
TFD will deploy resources to protect/evacuate the public and will protect the Southwest Gas employees
What is a typical gas leak response for TFD?
Engine
Ladder company
On a gas leak seem, you should determine the wind direction and approach ___ wind
Up wind
True or false…
You should shut down any equipment left on scene
FALSE
Do not shut down any equipment left on scene
What are the 4 things that we notify SWG via fire alarm?
Actual address
Nature of the emergency
Location of the command post
Directions for entering the area
What is the general rule for what a hot zone is defined as?
Any area where odor is present
Evacuate ___ wind occupancies
Down wind
What kind of PPE is used in the hot zone?
Full PPE with SCBA
What does SWG utilize for protection?
Dry chemical extinguisher
How do we reduce static electricity in an area?
Pull 1 3/4 line and wet down the area with a fog pattern
If damage is ___ to a shutoff valve TFD can shut down the gas supply but must remain…
Distal
On scene until SWG arrives
What is LPG?
Liquefied Petroleum Gas
LPG is usually what gas?
Propane
Is propane heavier or lighter than air?
Heavier
One vehicles running on LPG or CNG they are not required to have any…
Markings indicating alternative fuel being used
