Natural Gas Emergency Flashcards

1
Q

What is gas company that serves Portland fire?

A

Northwest Natural Gas Company

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2
Q

When approaching gas call be __ wind

A

Upwind

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3
Q

Restrict vehicle and pedestrian traffic within one block or ___ feet

A

300

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4
Q

Withdraw from structure when natural gas levels reach __% volume. A reading of “20” on air monitor

A

1

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5
Q

Natural gas LEL and flammable range

A

5% and 5-15%

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6
Q

Do not bring ___ into hot zone

A

Cell phone

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7
Q

Only ___ can restore gas service

A

NW natural

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8
Q

Natural gas will flow down the path of ___

A

Least resistance

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9
Q

It is especially important to check ___ (where gas piping usually enters the building)

A

Basements

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10
Q

Upper areas are also important to check because natural gas is lighter than air with a vapor density of

A

.6

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11
Q

Three types of gas pipe found in Portland.

A

Steel, direct buried polyethylene, and poly pipe inserted in a casing

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12
Q

A majority of new NW Natural utilize this

A

Poly pipe by itself

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13
Q

When __pipe is damaged escaping gas can build up static charge, igniting the escaping gas

A

Poly

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14
Q

Damage to __ pipe will usually be localized and generally won’t be transmitted to adjacent structures

A

Poly

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15
Q

Used for transmission-pressure gas pipelines 50-80psi, standard pressure <50 psi. When damaged it will electrically ground itself to the soil, eliminating the danger of ignition from static electricity build up

A

Steel

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16
Q

Primary danger when dealing with ___pipe is the possibility that gas will escape into the gap between the poly pipe and the outer casing

A

Encased poly

17
Q

This type of casing is identified by large metal ring (looks like a washer) place around the pipe, just below the shut off valve

A

Poly pipe inserted in casing

18
Q

What valve do you shut down in a serious natural gas leak escaping outside of a structure with no fire and NW Natural hasn’t arrived

A

Close the valve located at the curb just on the customer side of the property line.

19
Q

Never operate any gas valve located

A

At the street

20
Q

When entering a home for gas leak, do not use

A

Doorbell

21
Q

Start ventilation where

A

The greatest concentration of gas is detected

22
Q

Make all electric fan connections ___ prior to entry

A

Outside

23
Q

When natural gas is burning outside of a structure, do you put out flame?

A

No

24
Q

Compressed natural gas vehicles are more common than

A

LNG

25
Q

Since 1999 new construction and reconstruction on single family houses have an excess flow device installed. Where are they and how much do they reduce flow

A

Permanently placed approximately 18 inches from distribution line (towards house) and reduces by 95%

26
Q

How do you determine if a supply line has an excess flow device?

A

A hole shaped as a diamond will be stamped through the washer

27
Q

CNG vehicles are marked with what sticker?

A

Blue diamond shaped sticker with silver border and CNG in middle

28
Q

CNG is stored in high pressure tanks at __psi

A

300

29
Q

Odorless cryogenic stored at approximately -260 with a vapor pressure of approximately 15 PSI and an expansion ratio of approximately 620:1 (liquid to vapor)

A

LNG

30
Q

___ is only being used to power public transportation

A

LNG

31
Q

What is only difference of sticker for LNG and CNG

A

Just the initials in the middle

32
Q

If LNG is flowing, control by…

A

Diking

33
Q

If LNG is burning, do you put it out? If so with what

A

Only if jeopardizing life and property, with dry chemical

34
Q

Why do you not direct a hose stream directly at LNG?

A

It will cause LNG to vaporize at a greatly accelerated rate