UTILITY EMERGENCIES Flashcards
What is Vapor Density?
Vapor density refers to the relative weight of a gas or vapor compared to air, which has an
arbitrary value of 1
Personnel should not take what into potentially explosive atmosphere?
should not take radios, pagers, cell phones, flashlights, and other equipment not safe
when arriving on scene for a gas utility emergency, personnel should position
apparatus
prior to and upwind of the hazard area
Drivers should avoid parking
their vehicles over what?
sewers, valve covers, and manhole covers because the collection of gases in
these locations could present a potential hazard to first responders.
If personnel detect the odor of mercaptan when arriving on scene, they should
move their apparatus
to an area without odor.
First-arriving units should position ______ ft or further from the incident location
100 ft
The first-arriving engine company’s unit officer should communicate a water supply report to?
second due engine company
H2S—also known as
sewer gas due to its distinct odor—is colorless and smells like
rotten eggs.
H2S can be found in many
confined spaces, including manholes, drainage pipes, and basements
H2S
It becomes flammable at___
and is toxic at___
4%
and
100ppm
During the size-up, unit officers should complete a ________ of the structure
360-degree lap
To determine fresh air
values and accurately monitor atmospheric concentrations, personnel must ___________before
entering the hot zone.
bump-test AMDs
Personnel should avoid performing fresh air calibration inside ________ as off-gassing
personal protective equipment (PPE) or a minor exhaust leak could alter what the monitor
establishes as fresh air.
fire apparatus
Personnel should cautiously approach the affected building from ?
the corners
In cases where the fire department has been called to an inside gas leak with nothing found, the
source of the odor might be a ?
dry J-, P-, or S-trap in a drain?
LEL operational action levels are as follows:
____%: Investigate the area in full PPE
_______%: Continue to investigate utilizing SCBA
_______% or greater: Evacuate, secure utility from the structure’s exterior, and perform exterior
natural ventilation
0–10%
: Investigate the area in full PPE
10–25%: Continue to investigate utilizing SCBA
25% or greater: Evacuate
When personnel cannot control a gas leak at an appliance or meter, they may have to locate the
gas
curb valve that regulates the building’s gas service.
If personnel accidentally turn off a gas street valve, they should?
should not turn it back on
When controlling the gas, water, or electricity in a specific area or at a specific appliance, the
OIC should?
recommend a licensed or certified technician who can restore the area
Personnel should confirm
___________ have been controlled before beginning ventilation operations
ignition sources
During gas utility emergencies, gas concentrations higher than ____% of the LEL and CO levels
greater than _______ppm indicate an IDLH
10% of the LEL
CO levels
greater than 1,200 ppm
Personnel assigned to RECON operations should dress in _______?
in full
structural PPE with SCBA.
When atmospheric monitoring indicates an IDLH environment, ICs should establish?
operational
hot and cold zones
Members should use a ___________ and ________to protect
personnel working in the hot zone
hoseline and dry chemical extinguisher
