Natural Gas Emergency

Question 1

What is gas company that serves Portland fire?

Answer 1

Northwest Natural Gas Company

Question 2

When approaching gas call be __ wind

Answer 2

Upwind

Question 3

Restrict vehicle and pedestrian traffic within one block or ___ feet

Answer 3

300

Question 4

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

Answer 4

1

Question 5

Natural gas LEL and flammable range

Answer 5

5% and 5-15%

Question 6

Do not bring ___ into hot zone

Answer 6

Cell phone

Question 7

Only ___ can restore gas service

Answer 7

NW natural

Question 8

Natural gas will flow down the path of ___

Answer 8

Least resistance

Question 9

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

Answer 9

Basements

Question 10

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

Answer 10

.6

Question 11

Three types of gas pipe found in Portland.

Answer 11

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

Question 12

A majority of new NW Natural utilize this

Answer 12

Poly pipe by itself

Question 13

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

Answer 13

Poly

Question 14

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

Answer 14

Poly

Question 15

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

Answer 15

Steel

Question 16

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

Answer 16

Encased poly

Question 17

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

Answer 17

Poly pipe inserted in casing

Question 18

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

Answer 18

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

Question 19

Never operate any gas valve located

Answer 19

At the street

Question 20

When entering a home for gas leak, do not use

Answer 20

Doorbell

Question 21

Start ventilation where

Answer 21

The greatest concentration of gas is detected

Question 22

Make all electric fan connections ___ prior to entry

Answer 22

Outside

Question 23

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

Answer 23

No

Question 24

Compressed natural gas vehicles are more common than

Answer 24

LNG

Question 25

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

Answer 25

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

Question 26

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

Answer 26

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

Question 27

CNG vehicles are marked with what sticker?

Answer 27

Blue diamond shaped sticker with silver border and CNG in middle

Question 28

CNG is stored in high pressure tanks at __psi

Answer 28

300

Question 29

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)

Answer 29

LNG

Question 30

___ is only being used to power public transportation

Answer 30

LNG

Question 31

What is only difference of sticker for LNG and CNG

Answer 31

Just the initials in the middle

Question 32

If LNG is flowing, control by…

Answer 32

Diking

Question 33

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

Answer 33

Only if jeopardizing life and property, with dry chemical

Question 34

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

Answer 34

It will cause LNG to vaporize at a greatly accelerated rate