Natural Gas Flashcards by Phillip Celaya

Where is natural gas found and in what form is found?

Underground

Gaseous

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What is natural gas composed of?

85% methane
11% ethane
2% nitrogen
1% carbon dioxide
1% other gases ( sulfur, propane, butane, oxygen, helium)

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What are the characteristics of natural gas?

Colorless
Odorless
Non-toxic

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Why does natural gas smell?

Ethyl Mercaptan is added to give the gas a rotten egg smell

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What is the vapor density of natural gas?

.65

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What is the vapor density propane?

1.55

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What is the vapor density of butane?

2.0

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What is the vapor density of ether?

2.55

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What is the ignition temperature of natural gas?

1200°F

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What is the ignition temperature of propane?

950°F

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What is the ignition temperature of butane?

900°F

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Was the ignition temperature of ether?

365°F

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What is the LEL/UEL of natural gas?

4% – 14%

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What is the LEL/UEL of propane?

2.4% – 9.5%

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What is the LEL/UEL of butane?

1.8% – 8.4%

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What is the LEL/UEL of ether?

1.9% – 48

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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