Gas Utilities

Question 1

How is gas delivered in city of Los Angeles ?

Answer 1

Underground service pipes

Question 2

What is added to natural gas as oderants?

Answer 2

Mercaptian/Thiophane mix

1 pint per million cubic ft of gas

Question 3

Large quantities inhaled natural gas are ok true or false

Answer 3

False lg quantities can cause asphyxiation

Question 4

What’s the ignition temperature of Natural gas?

Answer 4

1100 degrees F

Question 5

What’s the flammable range of natural gas?

Answer 5

4-14%

Question 6

What’s the transmission lines pressured at ?

Answer 6

1000 psi

Question 7

How is natural gas generally distributed

Answer 7

Transmission lines and distribution lines

Question 8

What the size of transmission lines in Southern California

Answer 8

12-36” in diameter

Question 9

What pressure are service gas lines ?

Answer 9

Medium 60psi

Question 10

What pressure is the meter set assembly reduced to ?

Answer 10

Low pressure 1/3 psi

Question 11

What are gas mains generally?

Answer 11

Polyethylene

Question 12

What are older distribution mains?

Answer 12

Steel or copper

Question 13

Polyethylene mains are color coded what colors?

Answer 13

Yellow new national standard

Pink or orange older installations

Question 14

What are above ground gas lines made of ?

Answer 14

Must be made of steel

Question 15

Where can gas distribution lines be found ?

Answer 15

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

Question 16

Where can meter set assembleies be found?

Answer 16

Outside set
Underneath stair set
Curb meter set
Cabinet set

Question 17

What additional categories are MSAs

Answer 17

Residential
Industrial
Multiple gas meter

Question 18

What’s the basic MSA consist of

Answer 18

Piping,
Shut off valve
Regulator
Gas meter

Question 19

What’s another name for shut off valve?

Answer 19

Stopcock or service cock

Question 20

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

Answer 20

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

Question 21

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?

Answer 21

A G chiseled or painted

Question 22

What are some MSA equipped with?

Answer 22

Vibration sensitive shut off valve

Earthquake valves

Question 23

Turning reset button ______ completes the reset of device

Answer 23

One quarter turn

Question 24

What are industrial shut off valves known as ?

Answer 24

Nordstrom valves

Question 25

What kind of meter is used in industrial gas lines?

Answer 25

Rotary meter

Question 26

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

Answer 26

True

Question 27

What is branch service mean?

Answer 27

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

Question 28

To turn off gas Sgt off valve should be ?

Answer 28

Crosswise

Question 29

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

Answer 29

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

Question 30

What are curb valves ?

Answer 30

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

Question 31

Who carries equipment that can detect gas and its LEL?

Answer 31

Haz Mat companies

Question 32

Is crimping plastic piping ok

Answer 32

As Long tools are grounded

Question 33

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

Answer 33

97%

Question 34

How can you prevent ignition from plastic pipe?

Answer 34

Fogging down with wet water

Question 35

What are considerations of natural gas fire

Answer 35

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

Question 36

Small fires may be extinguished with?

Answer 36

Dry chemical or CO2 if necessary

Question 37

Large fires involving natural gas

Answer 37

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