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Building Construction > Gas Utilities > Flashcards

Gas Utilities Flashcards

1
Q

How is gas delivered in city of Los Angeles ?

A

Underground service pipes

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2
Q

What is added to natural gas as oderants?

A

Mercaptian/Thiophane mix

1 pint per million cubic ft of gas

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3
Q

Large quantities inhaled natural gas are ok true or false

A

False lg quantities can cause asphyxiation

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4
Q

What’s the ignition temperature of Natural gas?

A

1100 degrees F

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5
Q

What’s the flammable range of natural gas?

A

4-14%

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6
Q

What’s the transmission lines pressured at ?

A

1000 psi

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7
Q

How is natural gas generally distributed

A

Transmission lines and distribution lines

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8
Q

What the size of transmission lines in Southern California

A

12-36” in diameter

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9
Q

What pressure are service gas lines ?

A

Medium 60psi

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10
Q

What pressure is the meter set assembly reduced to ?

A

Low pressure 1/3 psi

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11
Q

What are gas mains generally?

A

Polyethylene

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12
Q

What are older distribution mains?

A

Steel or copper

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13
Q

Polyethylene mains are color coded what colors?

A

Yellow new national standard

Pink or orange older installations

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14
Q

What are above ground gas lines made of ?

A

Must be made of steel

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15
Q

Where can gas distribution lines be found ?

A

Underneath city streets Parallel to curbs under feast parkways between curb and side walk and occasional alley

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16
Q

Where can meter set assembleies be found?

A

Outside set
Underneath stair set
Curb meter set
Cabinet set

17
Q

What additional categories are MSAs

A

Residential
Industrial
Multiple gas meter

18
Q

What’s the basic MSA consist of

A

Piping,
Shut off valve
Regulator
Gas meter

19
Q

What’s another name for shut off valve?

A

Stopcock or service cock

20
Q

What are special interest of stopcock for personnel shitting of to consider?

A

A ring around stopcock indicates a branch service

Flat washer indicates platic pipe inside older metal pipe

A band indicates service line in plastic

Up the rider the regulator reduced from med to low pressure

Next pipe fittings leading to gas meter after meter gas flows through pipes to structure

21
Q

What is required by Cal OSHA mark the location where device line passes beneath curb and indicate which side of building the MSA is located?

A

A G chiseled or painted

22
Q

What are some MSA equipped with?

A

Vibration sensitive shut off valve

Earthquake valves

23
Q

Turning reset button ______ completes the reset of device

A

One quarter turn

24
Q

What are industrial shut off valves known as ?

A

Nordstrom valves

25
Q

What kind of meter is used in industrial gas lines?

A

Rotary meter

26
Q

MSA in multiple habitation or commercial occupancies are equipped with Main and individual shut offs true or false ?

A

True

27
Q

What is branch service mean?

A

In multiple structures and commercial areas. May be served by single service called a standard service Main

The building furthest away is standard service and the rest are branch off of that pipes

28
Q

To turn off gas Sgt off valve should be ?

A

Crosswise

29
Q

How far can you turn the packing but when using tow wrenches

A

1/4 turn if loosen too much core can fly out and leak medium pressure 40-60psi gas

30
Q

What are curb valves ?

A

Emergency shut off valves

Can be found schools churches hospitals

Located near Pepe Perry line 2-3ft underground marked by a lid marked gas company

31
Q

Who carries equipment that can detect gas and its LEL?

A

Haz Mat companies

32
Q

Is crimping plastic piping ok

A

As Long tools are grounded

33
Q

The gas company stated that its product is ____ free from impurities

A

97%

34
Q

How can you prevent ignition from plastic pipe?

A

Fogging down with wet water

35
Q

What are considerations of natural gas fire

A

Protect exposures
Let gas burn until supply is shut off
Control evacuation and site security
Notify gas company

36
Q

Small fires may be extinguished with?

A

Dry chemical or CO2 if necessary

37
Q

Large fires involving natural gas

A

Fog stream can be used to approach valves try to keep water out of excavations

Building Construction (4 decks)

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