Book 29 Ch 6 Gas Utilities

Question 1

For the purpose of leak detection, odorant is added so that as little as __-percent of natural gas in the air can be detected

Answer 1

1

Question 2

PROPERTIES OF NATURAL GAS - The common odorant is a ___________/_____________ mix, which is used in solution of one pint per million cubic feet of gas

Answer 2

Mercapitan/Thiophane

Question 3

Natural gas is _________ than air

Answer 3

Lighter

Question 4

fuels such as ________ and _________, which are heavier than air; and when escaping, it will collect in low areas

Answer 4

Butane
Propane

Question 5

Natural gas also has an ignition temperature of _____ degrees, and has a relativey small flammable range between __ and ___ percent

Answer 5

1100
4 & 14

Question 6

Most natural gas is initially distributed through over _________ miles of transmission lines from Texas, Kansas, New Mexico, Oklahoma, Arizona, and the Rocky Mountain area

Answer 6

30,000

Question 7

Transmission lines maintain pressures up to _____ psi and use pressure booster compressor stations, at specific intervals, to maintain appropriate flow and pressures

Answer 7

1000

Question 8

Transmission lines bring natural gas into the Southern California area and vary in diameter from ___ to ___ inches

Answer 8

12 to 36

Question 9

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

Answer 9

60

Question 10

At the service meter (Meter Set Assembly), the pressure is reduced to a low pressure (approximately ____ psi.)

Answer 10

1/3

Question 11

Distribution mains are generally ______________ and account for a high percentage of the mains in use today, older are steel

Answer 11

Polyethylene

Question 12

These pipes are ________, which is the national color code for newer installations

Answer 12

Yellow

Question 13

Older installations of plastic pipe can be ______ (salmon _______), or ________ in color

Answer 13

Pink
Beige
Orange

Question 14

Polyethylene will have a ______ running the length of the pipe, for locating plastic gas lines, below ground

Answer 14

Wire

Question 15

Above ground gas lines must be made of _______ and cannot be plastic

Answer 15

Steel

Question 16

Gas companies refer to gas meters as ________ _____ _____________ (MSA’s)

Answer 16

Meter Set Assemblies

Question 17

Additionally, MSA’s can be categorized as follows:
1. _________
2. _________
3. _________ Gas Meter

Answer 17

1. Residential
2. Industrial
3. Multiple

Question 18

Tracing the riser up from the ground, the first Fitting is the shut- o ff valve called a _________ or ________ cock

Answer 18

Stopcock
Service

Question 19

A “___”, required by Cal-OSHA, marks the location where the service line passes beneath the curb and indicates which side of the building the MSA is ocated

Answer 19

G

Question 20

Earthquake Valve - normally mounted on the ___________ side, right side as you face the meter, of an MSA

Answer 20

Discharge

Question 21

Earthquake Valve - Turning a reset button, ____ turn, completes reset of this device

Answer 21

1/4

Question 22

Industrial shut-off valves, known as _________ valves, are used for high pressure applications, can only be turned ____ turn, in either direction, ensuring the “ON” and “OFF”

Answer 22

Nordstrom
1/4

Question 23

SHUTOFF VALVES - To turn off the flow of gas, turn the tang, ___________ to the pipe, to the flow of gas

Answer 23

Crosswire

Question 24

Stuck Tangs - Use two wrenches, one on the tang and the other on the backing nut. Holding the tang steady, loosen the backing nut ____ turn only! 1/2 turn will continue to let the gas’s flow.

Answer 24

1/4

Question 25

Stuck Tangs - If the backing nut is loosened too far, the core can fly out, leaking medium pressure gas, ___ to ___ psi

Answer 25

40 to 60

Question 26

CURB VALVES - They are __ to __ feet underground and under a small metal, concrete or fiberglass lid; with "Gas Company" markings in raised letters

Answer 26

2 to 3

Question 27

LEAKS INSIDE STRUCTURES - For faint odors, always check the condition of ______ lights as a first action

Answer 27

Pilot

Question 28

LEAKS INSIDE STRUCTURES - If a leak is suspected, pouring _______ water over the suspected area can confirm its presence

Answer 28

Soapy

Question 29

The Gas Company states that its product is ___ percent free from impurities. However, if any liquid flows from a natural gas pipe, do not let it touch your body

Answer 29

97

Question 30

LEAKS OUTSIDE STRUCTURES - Fog down the plastic pipe with a wetting agent such as wet water to prevent ________ from static electricity

Answer 30

Ignition

Question 31

Small fires may be extinguished with _____ _____, or _____ if necessary, to approach a shut off valve

Answer 31

Dry Chem Co2

Question 32

A ring on the stopcock valve indicates a branch service.

Answer 32

.

Question 33

A flat washer on the stopcock valve indicates that the service line is a plastic pipe inserted inside an older metal pipe

Answer 33

.

Question 34

A band on the stopcock valve indicates the service line is plastic

Answer 34

.