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Books > BOOK 29 TRUCK OPERATIONS MANUAL CHAPTER 6 GAS UTILITIES > Flashcards

BOOK 29 TRUCK OPERATIONS MANUAL CHAPTER 6 GAS UTILITIES Flashcards

1
Q

Pure natural gas is completely

A

Odorless

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2
Q

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

A

One percent

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3
Q

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

A

Mercapitan/thiophane

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4
Q

Natural gas is lighter than

A

Air

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5
Q

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

A

1100 degrees

4 and 14%

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6
Q

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

A

30,000

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7
Q

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

A

1000 psi

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8
Q

Natural gas is generally distributed by a combination of

A

Transmission lines and distribution mains

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9
Q

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

A

12-36’’

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10
Q

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

A

60 psi

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11
Q

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

A

1/3

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12
Q

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

A

Polyethylene

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13
Q

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

A

Steel or copper

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14
Q

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.

A

Yellow

Pink
Orange

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15
Q

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

A

Wire

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16
Q

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

A

Steel

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17
Q

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

A

Distribution mains

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18
Q

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

A

Pressure regulators and meters

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19
Q

Gas companies refer to gas meters as

A

Meter set assemblies

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20
Q

MSA’s can be found in the following locations:

A

Outside set
Underneath set
Curb meter box
Cabinet set

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21
Q

Additionally, MSA’s can be categorized as follows:

A

Residential
Industrial
Multiple Gas Meter

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22
Q

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

A

Riser

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23
Q

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

A

stopcock or service cock.

24
Q

A ring on the stopcock valve indicates a

A

Branch service

25
Q

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

A

Flat washer

26
Q

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

A

Band

27
Q

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.

A

Regulator

28
Q

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.

A

G

29
Q

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

A

EARTHQUAKE VALVE

30
Q

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

A

Discharge

31
Q

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

A

Swift kick

32
Q

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

A

One quarter

33
Q

INDUSTRIAL METER SET ASSEMBLIES

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

A

Nordstrom valves

34
Q

INDUSTRIAL METER SET ASSEMBLIES

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

A

In series

35
Q

INDUSTRIAL METER SET ASSEMBLIES

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

A

Rotary

36
Q

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.

A

Concrete or fiberglass

37
Q

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.

A

Master stopcocks

38
Q

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

A

Standard service

Branch service

39
Q

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!

A

Wrenches

One-quarter

40
Q

NOTE

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

A

Pin

41
Q

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

A

Nordstrom valve

42
Q

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

A

One quarter

43
Q

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

A

Gate valve

44
Q

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

A

Two to three

45
Q

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.

A

Pickhead axe

46
Q

Curb valves

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

A

Faucet

Clockwise

47
Q

Curb valves

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

A

Sprinkler key

48
Q

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

A

Inside leaks
Outside leaks
Leaks resulting in fires

49
Q

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

A

Inside structures

50
Q

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

A

Piglet lights

51
Q

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

A

Isolation valve stopcock

52
Q

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)

A

Bend back

53
Q

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

A

Crimping

54
Q

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

A

Redwood plugs

55
Q

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

A

Polychlorinated biphenyls

56
Q

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

A

Wet water

57
Q

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

A

Dry chemical or C02

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