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Book 29 > Gas Utilities > Flashcards

Gas Utilities Flashcards

1
Q

Pure natural gas is

A

completely odorless

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2
Q

Name of odorant added

A

Mercapitan/ Thiophane mix. one pint per million cubic feet of gas

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3
Q

Natural gas is _____ than air

A

lighter

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4
Q

Butane and propane are ___ than air

A

heavier

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5
Q

Natural gas ignition temperature of ____

A

1,100 degrees and has a flammable range between 4 and 14%

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6
Q

Transmission lines maintain pressure up to ____

A

1000 psi

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7
Q

Transmission lines bring natural gas in Socal can vary between _____

A

12 to 36”

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8
Q

The gas carried in services lines normally do not exceeed

A

60 psi

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9
Q

At the service meter (Meter Set Assembly) the pressure

A

is reduced to a low pressure approximate 1/3 psi

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10
Q

Polyethylene mains are color coded to identify the pipe as transporting gas.. what color?

A

yellow

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11
Q

Meter Set Assemblies found

A

Outside, underneath, curb meter or cabinet (enclosure on the exterior of structure)

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12
Q

Residential Meter Set Assemblies

A

Consist of piping, a shut off valve, regulator and gas meter

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13
Q

A ring on the stopcock valve indicates a ____

A

branch service

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14
Q

A flat washer on the stopcock valve indicates

A

that the service line is a plastic pipe inserted inside an older metal pipe

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15
Q

A band on the stopcock valve indicates

A

the service line is plastic

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16
Q

Regulator is flat circular device that

A

reduces medium gas pressure (up to 60 psi) to 1/3 psi

17
Q

Look for a ___ that is either chiseled or painted on the curb

A

“G”

18
Q

A “G” required by Cal-OSHA, marks ___

A

the location where the service line passes beneath the curb and indicates which side of the building the MSA is located

19
Q

Some MSA may be equipped with an emergency vibration sensitive shut off device known as a

A

earthquake valve

20
Q

Industrial shut up vales are known as

A

Nordstrom valves.

Book 29 (8 decks)

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