Ch. 19 Fire-Related Emergencies: Incinerators, Oil Burners & Gas Leaks Flashcards Preview

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Flashcards in Ch. 19 Fire-Related Emergencies: Incinerators, Oil Burners & Gas Leaks Deck (79)
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1

Natural gas is primarily:

Methane (more than 90%)
- Ethane, up to 5%
- CO and Nitrogen

2

The presence of _____ in natural gas can sometimes be used by FIRE DEPARTMENTS and UTILITY companies to pinpoint the source of persistent "gas odors" that have no apparent source.

Ethane

3

Everyone has "smelled gas". Odorant added at a precise rate, so as little as 1% of gas can be detected. The odorant is generally _____, compounded with sulfides.

Mercaptan

4

As little as _______ of odorant can treat up to _________.

1/4 lb.
1 million cu. ft. of natural gas

5

Vapor density of natural gas

.60

6

Large percentage of total number of FD responses involve incidents in which no fire is present OR fire is within its normal container, may be termed:

Emergency Responses

7

Pipeline leak: FD operations should be:

-EVACUATING endangered area.
-PROTECTING exposed bldgs and EXAMINING for gas seeping into them.
-NO attempts at closing any valves

8

2 kinds of regulators (natural gas)

Newer-spring loaded,
steady rate,
1/4 psi diaphragm.
Older-"dead weight",
column of mercury maintain pressure on diaphragm,
being phased out.
Regulator holds pressure between 2 and 4 psi

9

Regulators inside a building have the vent line piped out through the wall to a:

Peck vent OR fisher vent

10

Steps for gas regulator failure:

Notify utility
Shutoff gas
Search for gas, fire and victims
Vent area

11

Flammable range of natural gas

4 - 14%
(5-15% in hazmat)

12

Markings on radio for intrinsically safe:

Class 1, Division 1 or 2 atmospheres

13

Natural Gas-Curb valves control the gas service into building. As a guide:

Inside services, high pressure-Yes

Outside meters, low pressure-No (O's)

14

Deciding WHEN to vent:

How large a leak
Source of ignition/can you control them
Status of gas/air mixture

15

(Natural gas) Of all decisions to be made, _______ has the most variables.

WHERE to stop the leak-inside or outside

16

Gas emergencies usually involve ______ engine company(s)

At least 1.
enough personnel to stretch hoseline.
long enough to cover ENTIRE building.
Apparatus for most shielding.

17

Gas leaks usually take _________.

Path of least resistance-underground along gas pipe or other underground lines, gas deodorized as it travels, soil filters out odor.

18

Nose can detect _____ of gas in air

1%. desensitized after short time. combustible gas meter (explosimeter), 2 meters preferable.

19

Do's and Don't's of outside leak

DO
-stop leak in low-press. STEEL lines (to save a life!!).
-have dry-chem and water ready if someone enters trench.
DON'T
-touch valves in street.
-EVER attempt to stop leak in plastic pipe.

20

Vapor density for propane and butane

Butane - 2.01
Propane - 1.52

21

Barbecue: Leak of LPG (liquid petroleum gas) near the neck AND accompanying fire

-small fire, if on low-pressure side.
-extinguish by turning off valve OR garden hose.
-isn't done because = lack of knowledge or fear of injury

22

To avoid casualties involving LPG (BLEVE), FF's need:

-working knowledge of LPG properties
-cylinders in which it was shipped
-tactics for dealing with scenarios

23

LPG or propane leaking finds source of ignition after having the opportunity to spread out farther and mix with more air

Vapor-air explosion (or fuel-air explosion)
-MORE devastating than leak that ignites immediately or BLEVE

24

Propane characteristics:

Flammable range = 2.1 - 9.5%
VD = 1.52
Boiling point = -44F

25

Propane pressure at 70 and 100 degrees

70F = 100 psi
100F = 190 psi

26

BLEVE isn't caused by _____ but by ______.

Rise in pressure
Loss of strength due to heat
-steel at 1500F loses HALF its strength

27

How many handlines and stream pattern for LPG cylinder.

Three or four 1 1/2 in. or 1 3/4 in. handlines (within exposed bldg, outside protect structure, cylinder fire)
Initially, straight or narrow fog
-as distance DECREASES, fog gets WIDER so as not to knock over cylinder
*open spaces-extinguish, built-up areas-Isn't recommended*

28

Heating systems account for _____% of all fires

21

29

Modern oil burner consists of:

-oil gun
-firebox

30

Gas leaks are ________ and ________.

Among the most common
POTENTIALLY the most deadly