BOOK 29 TRUCK OPERATIONS MANUAL CHAPTER 6 GAS UTILITIES

Question 1

Pure natural gas is completely

Answer 1

Odorless

Question 2

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 2

One percent

Question 3

The common odorant is a ______/______ mix, which is used in solution of one pint per million cubic feet of gas.

Answer 3

Mercapitan/thiophane

Question 4

Natural gas is lighter than

Answer 4

Air

Question 5

Natural gas also has an ignition temperature of _____ degrees, and has a flammable range between _ and __ percent.

Answer 5

1100 degrees

4 and 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 psi

Question 8

Natural gas is generally distributed by a combination of

Answer 8

Transmission lines and distribution mains

Question 9

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

Answer 9

12-36’’

Question 10

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

Answer 10

60 psi

Question 11

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

Answer 11

1/3

Question 12

Distribution mains are generally _______ and account for a high percentage of the mains in use today.

Answer 12

Polyethylene

Question 13

Older existing distribution mains are made of ____ or _____, but are rare to find.

Answer 13

Steel or copper

Question 14

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. Older installations of plastic pipe can be ___ (salmon beige), or ______ in color.

Answer 14

Yellow

Pink
Orange

Question 15

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

Answer 15

Wire

Question 16

Above ground gas lines must be made of _____ and cannot be plastic.

Answer 16

Steel

Question 17

are normally located underneath city streets, parallel to curbs, under grassy parkways, between the curb and sidewalk, and occasionally in alleys.

Answer 17

Distribution mains

Question 18

Service lines run from distribution mains to structures, via an outside riser, where ______ ______ and ______ are located.

Answer 18

Pressure regulators and meters

Question 19

Gas companies refer to gas meters as

Answer 19

Meter set assemblies

Question 20

MSA’s can be found in the following locations:

Answer 20

Outside set
Underneath set
Curb meter box
Cabinet set

Question 21

Additionally, MSA’s can be categorized as follows:

Answer 21

Residential
Industrial
Multiple Gas Meter

Question 22

The pipe rising vertically from the ground, close to the exterior wall of a structure is called a

Answer 22

Riser

Question 23

Tracing the riser up from the ground, the first fitting is the shut- off valve called a

Answer 23

stopcock or service cock.

Question 24

A ring on the stopcock valve indicates a

Answer 24

Branch service

Question 25

A ____ _____ on the stopcock valve indicates that the service line is a plastic pipe inserted inside an older metal pipe.

Answer 25

Flat washer

Question 26

A ____ on the stopcock valve indicates the service line is plastic.

Answer 26

Band

Question 27

Next, up the riser, is a flat circular device called a "_______" that reduces medium gas pressure (up to 60 psi) to a relatively low level of approximately 1/3 psi.

Answer 27

Regulator

Question 28

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 located.

Answer 28

G

Question 29

Some MSA's may be equipped with an emergency vibration-sensitive shut off device known as an

Answer 29

EARTHQUAKE VALVE

Question 30

Earthquake valves are marketed by private industry and are normally mounted on the ______ side, right side as you face the meter, of an MSA.

Answer 30

Discharge

Question 31

Personnel should recognize and understand that a ____-____ may possibly shut off the flow of gas,

Answer 31

Swift kick

Question 32

Turning a reset button, ___ turn, completes reset of this device.

Answer 32

One quarter

Question 33

INDUSTRIAL METER SET ASSEMBLIES Industrial shut-off valves, known as ______ valves, are used for high pressure applications.

Answer 33

Nordstrom valves

Question 34

INDUSTRIAL METER SET ASSEMBLIES Industrial applications that are high pressure can use two regulators in _____ to regulate the gas pressure.

Answer 34

In series

Question 35

INDUSTRIAL METER SET ASSEMBLIES A _____ meter is used, instead of a conventional MSA, to regulate the high pressure and handle quick surges.

Answer 35

Rotary

Question 36

INDUSTRIAL METER SET ASSEMBLIES The lid over the curb meter space is made of lightweight _____, or _____ set in a metal frame, and is easily identified by its gas company markings.

Answer 36

Concrete or fiberglass

Question 37

MULTIPLE METER SET ASSEMBLIES ____ _________ shut off the entire building and individual meters/stopcocks can control the flow of gas to individual occupancies in one structure.

Answer 37

Master stopcocks

Question 38

The occupancy that is further from the supply main is a _____ _____, and the other occupancies are ____ _____.

Answer 38

Standard service | Branch service

Question 39

If tang on shut off valve is stuck Use two _______, one on the tang and the other on the backing nut. Holding the tang steady, loosen the backing nut ____-_____ turn only!

Answer 39

Wrenches | One-quarter

Question 40

NOTE | Newer stopcocks have a ___ driven into the backing nut, and bolt, and cannot be loosened.

Answer 40

Pin

Question 41

The ______ _____ is a larger version of a residential stopcock.

Answer 41

Nordstrom valve

Question 42

The tang on a Nordstrum valve can only be turned __-____ turn, in either direction, ensuring the "ON" and "OFF" positions are easy to locate.

Answer 42

One quarter

Question 43

Some industrial meters are equipped with a ____ ____ that has a wheel handle (similar to an OS&Y).

Answer 43

Gate valve

Question 44

Curb valves are ___ to ____ feet underground and under a small metal, concrete or fiberglass lid; with "Gas Company" markings in raised letters.

Answer 44

Two to three

Question 45

Curb valves If the lid is stuck, and additional leverage is necessary, insert the point of a _____ _____ in the hole and apply the proper leverage.

Answer 45

Pickhead axe

Question 46

Curb valves This valve is an ordinary gate valve with a "_____" type handle. Turn the handle ______ to stop the flow of gas.

Answer 46

Faucet | Clockwise

Question 47

Curb valves If the valve is too deep to reach with the hand, a ____ ___ can be used for extra reach.

Answer 47

Sprinkler key

Question 48

Natural gas emergencies can be divided into the three following categories:

Answer 48

Inside leaks Outside leaks Leaks resulting in fires

Question 49

While each leak has its own dangers and concerns, the greatest danger results from gas leaks _____ ______, due to the potential for ignition and explosion.

Answer 49

Inside structures

Question 50

For faint odors, always check the condition of _____ ____- as a first action.

Answer 50

Piglet lights

Question 51

there will be a "master" valve called the _______ valve stopcock; which stops the flow to all tenants in the building on the service pipe.

Answer 51

Isolation valve stopcock

Question 52

Previously, The Gas Company used to teach its members a technique, known as the ____-____method, for controlling the flow of gas in small diameter pipes. (Now against gas company policy)

Answer 52

Bend back

Question 53

______plastic pipe is acceptable as long as all tools used to work on plastic pipe are grounded.

Answer 53

Crimping

Question 54

_____ _____ can be driven into various diameter steel pipes with a rubber mallet.

Answer 54

Redwood plugs

Question 55

Be aware that, on rare occasions, pipelines may contain hazardous contaminants such as _______ ______.

Answer 55

Polychlorinated biphenyls

Question 56

Fog down the plastic pipe with a wetting agent such as __ ___ to prevent ignition from static electricity. Water alone tends to bead up and run off of polyethylene pipe, thus reducing the effectiveness of water

Answer 56

Wet water

Question 57

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

Answer 57

Dry chemical or C02