Natural Gas emergencies & fires

Question 0

Priority order of valve shutdown ?

Answer 0

Appliance, Meter, Head of service(found just INSIDE bld where gas service enters), Exterior gas riser valve(before any exterior meter, Curb valve, Street valve

Question 1

Mostly methane. Also contains nitrogen, ethane, propane. Ignites at __, colorless/odorless, lighter then air, explosive range _ to _, non-toxic, asphyxiant.

Answer 1

1163 degrees, explosive range 5-15%

Question 2

How do you shut curb valve ?

Answer 2

1/4 turn clockwise

Question 3

Some older curb valves require multiple turns to close.

Answer 3

7 1/2 to 15 full turns

Question 4

FDNY TIC: intrinsically safe. ?

Answer 4

No. FD issued flashlights are

Question 5

Leaking plastic gas pipe ?

Answer 5

Do not touch or come near a leaking plastic pipe

Question 6

Dept fans are not intrinsically safe & should not be used to vent gas ? T o F

Answer 6

True

Question 7

Mjr indoor gas leak: start venting ?

Answer 7

Upper floors & work your way down to the first floor

Question 8

Sewer man covers can be removed ?

Answer 8

Approval of on scene Chief Officer

Question 9

Electric manhole covers: removal ?

Answer 9

By FDNY when requested by utility company gas rep & on scene Chief. Prior to removal utility co checks for stray voltage

Question 10

Round manhole covers should be removed by 2 FF utilizing manhole hooks. Where are they found ?

Answer 10

Battalion vehicle carry two. Do not pull rectangular or square electric manhole covers.

Question 11

CGI - Tiff carried by ?

Answer 11

Batt & ladder co

Question 12

MSA altair carried by. ?

Answer 12

ALL non soc supprt ladder companies

Question 13

DCGI: all SOC, SSL, HMTU. Calibrated to % of gas in air ? T o F

Answer 13

True

Question 14

DCGI & Altair alarm at ?

Answer 14

10% LEL the Indoor action level & different alarm 20% LEL the outdoor action level. Begin evac at 10% LEL

Question 15

FDNY in compliance w/Osha will begin evacuation at __% LEL if we are unable to reduce LEL immediately(vent, shut off valves)

Answer 15

10%

Question 16

Utility Co meters are calibrated the same as FDNY ? T o F

Answer 16

False. Utility Co meters display percent of gas in air.

Question 17

.50% gas in air = __% LEL

Answer 17

10% LEL. 5.00 = 100% LEL

Question 18

Peck vent: code reads 5-R-25 ?

Answer 18

Start at left hand front corner of the house, 5’ to right, 25’ right angles toward the sidewalk

Question 19

The letters EFV on tag ?

Answer 19

EFV = no curb valve. Letters NC no curb valve present

Question 20

MSA Altair to all Non SSL & does not replace Tiff. Has two sensors O2 & Gas. Calibrated to methane. Meter should not be used to detect gases other then natural gas. T or F?

Answer 20

True

Question 21

MSA Altair malfunctions ?

Answer 21

Not sent thru bag. Swap 1 for 1 w/ HM ops.

Question 22

MSA Altair: a series of ‘+++’ under COMB/EX ?

Answer 22

Atmosphere is ABOVE 100% LEL

Question 23

MSA Altair: normal O2 on meter is 20.8%. Low alarm is set at __% & high alarm is set at __%. Upon activation don facepiece. Notify dispatcher & have utility respond & request ETA. A series of ‘+++’ screen under O2 ?

Answer 23

Low alarm = 10% high = 20%Atmosphere ABOVE 25% O2

Question 24

TIF: carried by Battalions & ladder co. A gas source as low as __ppm can be detected?

Answer 24

5ppm. Intrinsically safe. Not for CO. Fully charged lasts 4 hours of continuous use. 30 second warm up & ticking sound will be heard.

Question 25

In some older HIGH pressure gas services, the main shut off valve will require approximately __ turns of operating nut, in clockwise direction to shut off the gas flow?

Answer 25

4 1/2 to 5 turns

Question 26

A leak or break in any gas piping may be stopped or greatly diminished by taping, stuffing rags, paper into break ? T/F

Answer 26

F. Low pressure only

Question 27

Indoor gas leak not burning use fog and/or dept fan to vent ? T/F

Answer 27

Fog not fan(not intrinsically safe)

Question 28

Do NOT pull any electric manhole if there is manhole fire in the AREA or if smoking of arcing is observed in electric manhole or transformer vault?

Answer 28

True

Question 29

If utility company meter reads .50% of gas in air -- what does fdny meters read ?

Answer 29

10% LEL. Ex: 5% gas would = 100% LEL. Explosive range 5% to 15%