Gas Utilities Ch.(6)

Question 1

The common odorant is a_____/_______mix, which is used in solution of ________ per _____ cubic feet of gas.

Answer 1

Mercapitan/Thiophane mix

One pint per million

Question 2

Natural gas also has an ignition temperature of ______degrees, and has a flammable range between ___and ___percent.

Answer 2

1100 degrees

4 and 14%

Question 3

Transmission lines maintain pressures up to ____ psi

Answer 3

1000

Question 4

Transmission lines vary in diameter from ___ to ___ inches.

Answer 4

12 to 36

Question 5

The gas carried by service lines as medium pressure, which normally does not exceed ____ psi

Answer 5

60

Question 6

At the service meter pressure is reduced to low pressure (approximately ___ psi)

Answer 6

1/3 psi

Question 7

Polyethylene mains are color coded to identify the pipe as transporting natural gas. These pipes are ____, which is the national color code for newer installations.

Answer 7

Yellow

Question 8

Older installations of plastic pipe can be ___ (________), or ______in color.

Answer 8

Pink( salmon beige)

Orange

Question 9

Above gas lines must be made of ____

Answer 9

Steel

Question 10

MSA’s can be found in the following locations

Answer 10

Outside set
Underneath set
Curb meter box
Cabinet set

Question 11

MSA’s can be categorized as follows x3

Answer 11

Residential
Industrial
Multiple gas meter

Question 12

Tracing the riser up from the ground , the first fitting is the shut off valve call a ____ or ____

Answer 12

Stopcock or service cock

Question 13

A ring on stopcock ;
A flat washer ;
A band;

Answer 13

Ring = branch service
A flat washer = plastic pipe inside metal pipe
A band = plastic pipe

Question 14

_____ pipes will have a wire running the length of pipe, for locating

Answer 14

Polyethylene

Question 15

look for a “____” that is either chiseled or painted on the curb. A “___”, required by ________, marks the location where the service line passes beneath the curb and indicates which side of the building the MSA is ocated

Answer 15

G

Cal- OSHA

Question 16

Industrial shut off valves , known as _____ valves, are used for high pressure applications

Answer 16

Nordstrom

Question 17

Meters under sidewalks call ____ meters, are common in commercial areas

Answer 17

Curb meters

Question 18

Who to notify if the identification as to which unit or building an MSA’s serves is worn away

Answer 18

Gas company

Question 19

Stuck tang during emergency;
Use two wrenches, one on the tang and the other on the backing nut. Holding the tang steady, loosen the backing nut _______turn only!

Answer 19

One quarter

Question 20

If backing nut is loosened to far, the core can fly out, leaking medium pressure gas ___ to ___

Answer 20

40 to 60

Question 21

The tang on a Nordstrom valve can only be turned _____ turn in either direction

Answer 21

One quarter turn

Question 22

Curb valves , also referred to as an _______

Located near property line by side walk ___ to ___ ft underground

Answer 22

Emergency shut off valve

2 to 3 ft

Question 23

Natural gas leaks can be divided into 3 categories .

*which is greatest danger

Answer 23

Inside
Outside
Leaks with fire

Question 24

Leaks outside structures;

The fire department role at the site is _______

Answer 24

To maintain public safety

Question 25

Type of mallet that should be used to drive plug into the end of a broken pipe. X 4

Answer 25

Wooden, rubber, plastic or brass