Utility Emergencies Flashcards
Electric, cable, conduit, lighting cable utility marking color is
Red
Gas, oil, steam, petroleum, or gaseous material utility marking color is
Yellow
Communications, alarm, or signal lines, cable or conduit utility marking color is
Orange
Potable water utility marking color is
Blue
Reclaimed water, irrigation and slurry lines utility marking color is
Purple
Sewer and drain lines utility marking color is
Green
Temporary survey markings utility marking color is
Pink
Proposed excavation utility marking color is
White
A simple hydrocarbon consisting of carbon and hydrogen
Methane
The weight of a given volume of gas compared to the weight of the same amount of air at the same temperature and pressure is
Vapor density
A pungent oderant that is added to natural gas as a safety precaution after it is received at the distribution site is
Mercaptan
The expansion ratio of liquefied natural gas to a gas is what
600:1
Gas lines typically have operating pressures of _____ to _____ pounds per square inch (PSI)
0.25 ; 55
Gas transmission lines range in size from ____ to _____ and have pressures up to 450psi
6” ; 30”
Pipeline markers show what
The approximate location
Signs on pipeline markers list what
The commodity transported, the name of the pipeline company, a telephone number
A pipeline sign that is and orange triangle on a stick is used for what
Aerial Reconnaissance
Gas shut off for leaks should be done in what order
1 At the appliance
2 At the meter
3 At the curb box
For gas leaks the first arriving unit should position where
No closer than 100 feet and upwind if possible
For gas leaks where should all incoming fire apparatus other than the first arriving unit position
Minimum distance of 300 feet
For gas leaks units should not position where
front of, to the rear of, or beside a building involved in a gas leak event
If a break in a gas line is over _____ inch diameter the incident should be upgraded to a hazmat response
2 inch
The initial alarm assignment for outside gas leaks should consist of a minimum of
1 engine company
1 truck or rescue
Fire department personnel shall ensure no persons enter a trench deeper than _____ feet that is not shored
5 feet
To protect the utility company workers, units should position upwind with what
A 20lb dry chem extinguisher and a charged hoseline when necessary
The DOT ERG suggests an evacuation distance of _____ feet for gas leaks
330 feet
In situations where you cannot find the leak you can do what to help pinpoint the source in piping and meters
Use a soapy water spray
In extreme cases the fire department can perform clamping or crimping a leak. This should only be done for what size lines
3/4” or smaller
The initial alarm assignment for inside gas leaks should consist of the following
2 engine companies
1 truck or rescue
1 BC
The gas regulator takes street pressure of up to _____ PSI and steps it down to somwehere between ________
40 PSI ; 1/2-1/4 PSI
In newer occupancies because of the longer distance for gas to go it may be at a pressure of what
2-5PSI
Two basic types of gas meters are
Inside & Outside
Is a fossil fuel that is found mixed with natural gas and petroleum deposits
Propane
Propane has an expansion ratio of
270:1
The vapor density of propane is
1.56 so it sinks
DOT states a person with a normal sense of smell should be able to detect a concentration in air of what
20% of the LEL
The relief valve of a propane tank is designed to operate and release pressure when the internal pressure exceeds what
250 psig
Is formed by the incomplete combustion of the fossil fuels
Carbon Monoxide (CO)
At incidents where an individual is in a vehicle that has downed power lines you should stay how far away
30 feet
Pole numbers have two lines that are what
Top line is the map grid for the pole
Bottom line is the specific pole #
To be proactive for underground electric vaults crews can do what
Ventilate while waiting for the power company
Firefighters should stay clear of manhole covers over underground electrical vaults as they have been known to blow off and flay as far as what
150 feet
For water emergencies the main supply valve is typically found where
In the basement or utility room
