UTILITY manual Flashcards
Many injuries and deaths were a result of?
Complacency and poor decision making
An automatic protection device that senses and interrupts distribution system faults
Recloser
The conductor part of transition leading from underground to over head may or may not include pothead
Riser
Electric service taken at less than 2,000 volts
Secondary
Process of opening switches or fuses to divide a circuit into sections to isolate the cause of the power outage.
Reduces impact of power outage to fewest customers*
Sectionalize
A quarter turn valve used to restrict or isolate the flow of liquid or gas in pipe
Stop-cock
Location which uses a collection of transformers to reduce voltage and circuit breakers to protect circuits
Substation
An electrical outage that lasts for more than two minutes
Sustained outage
A device for making, breaking, or changing connections
Switch
average exposure to contaminant or condition such as noise. Workers exposed without adverse effect over a period of 8hr day or 40hr week
TWA
Device which transforms electric energy from one voltage to another level
Transformer
High voltages between 60,000 and 500,000
Transmission
Abbreviation for Volt
V
A space underground for electric cables etc
Vault
Unit of measurement of electric potential
Volt
Flow of electric current across a gap between two conductors
Arc
A component that detects overload conditions and then disconnects
Breaker
A path through which electric current is intended to flow
Circuit
Abnormal electrical current
Fault
Melts and burns when specified value is exceeded
Fuse
Designed to be incapable of producing heat or spark sufficient to ignite
Intrinsically safe
Actions taken to reroute power
Isolate
Abbreviation for 1,000
K
Electrical outage less than 2 minutes
Momentary outage
Provides transition between underground cable to overhead lines or conductors
Pothead
2,000 to 50,000 volts to a distribution transformer
Primary
Chemicals with a narrow flammable range are ____ hazardous than those that have a broad flammable range.
Less
Chemicals with a flammable range in the higher percentages are generally ___ hazardous than those with low percentages
Less
TWA is an average rate of exposure over the course of
8 hour day - 40hr workweek
TWA levels are usually ___ than ceiling values
Lower
A vital resource that should be requested early on is
Assistance from the utility company
In order to reduce injury, death, damage to line, the Virginia state corporation commission approved The
American Public Works Association (APWA) color codes
Should supplement surface marks
Color coded vertical markers (temporary spikes or flags)
All markers and marks should indicate
Name, initials, logo of company and width of facility of greater than 2inches (50mm)
Marker may be as simple as
Color coded dash line
In areas of high traffic, the line may be
Off set with direction arrows
Electric, cable, conduit
Red
Gas oil, steam, gaseous material
Yellow
Communications, alarm, or signal lines
Orange
Potable water
Blue
Reclaimed water, irrigation, slurry lines
Purple
Sewer/drain lines
Green
Temporary survey lines
Pink
Proposed excavation
White
CI
CAST IRON
Copper
CPR
Ductile iron
DI
Plastic
PL
Polyvinyl chloride
PVC
Reinforced concrete
RFC
Steel cylinder concrete
SCC
Steel
STL
Terracotta
TC
Transite
TR
W/STL
Wrapped steel
Miss utility number
1-800-552-7001
Miss utility can be accessed by dialing
811
____ is a simple hydro carbon consisting of carbon and hydrogen
Methane
Carbon and hydrogen atoms joined together to make
Hydrocarbon
Vapor density is weight
Of air (1)
Vapor density of methane is
.55 less than 1 will rise
Methane or natural gas’s chemical abbreviation is
CH4
Although with a natural gas leak there will be no toxic components or health hazard, in heavy concentrations it will
Displace O2
Natural gas in its pure state is
Odorless and colorless
Pungent odorant that is added as a safety component at the distribution site
Mercaptan
Flammable range for methane is
5% to 15%
Ignition temp for natural gas is
1200F
The expansion ratio for CH4 is
600:1
Gas lines have operating pressure of
.25 to 55
Transmission lines range in size from 6” to 30” and have pressures up to
450psi
Transmission lines can generate ___ to ___ volts of static electricity
2,000 to 24,000
The largest network of energy pipelines of any nation in the world belong to
USA
___ remain the safest, most efficient and economical way to move these natural resources
Pipelines
Greatest risk to safe pipelines are accidental damage caused by
Excavation, construction
Pipeline leak indicators
Hissing sound/roar
Unusual odor, dead or discolored vegetation, dirt being blown, water bubbling.
Markers show the pipelines approximate
Location not the EXACT location
Markers do not
Indicate how deep the pipeline is buried or how many lines are in the area
Circular signs are located near
Roads, railroads, and along pipelines/right of ways
Arrow looking marker is a
Pipeline casting vent
To protect the pipeline from mechanical damage—— are installed at all major vehicular road and railroad crossings
Road castings
These seals are intended to keep water out and provide ____
Electrical insulation
____ ‘to ____ ‘max between PSI casting spacer
6-7
PSI end seal - model ___ or ___
C or W
___ vent pipes keep moisture from building in the air space between the casting and pipeline
Gooseneck vent
____ has been recently used as alternative to black iron pipe that was a mainstay in construction
Flexible gas line
Trade name for flexible gas line
CSST or corrugated stainless steel tubing. Trac pipe/ ward flex
Historically residential gas lines were found at the entry points of the structure to the ____ and ____
Kitchen, laundry
Due to flexible gas lines it is now much more popular to
Run lines in parts of the structure that would not previously of been used for
Common damage to CSST of flexible gas lines come from
Punctures in the line from wall hangings
Monitor for gas leaks with flexible gas lines at
Light switches, electrical outlets, void spaces
Proper sequence for shutting off utility for a leak
At the appliance, meter, curb box
Use ____ or ____ to shit off valves
Halligan or wrench
When performing a shut off at the curb box use _____ sided wrench to remove the cover of street valve
Five sided wrench
The valve to shut off is the one located ____ to the regulator
Prior
____ meters are usually much larger and operate at higher pressures than residential meters
Commercial
Dig around box with
Shovel
Apparatus shall position.
Prior to and upwind of hazard area
Apparatus no closer than ____ for the first arriving unit and a minimum distance of ____ for all other
100, 300
Second engine on a gas leak should stage
At a hydrant outside the hot zone
If a break in the line is reported to be over ____ inches in diameter the incident should be upgraded to a hazmat response
2 inches in diameter
Initial alarm for outside gas leak not meeting hazmat response criteria
1 engine 1 truck or rescue
First arriving unit shall, on an outside gas leak
Recon to find extent of leak
First arriving officer on an outside gas leak is responsible for
Identifying a staging area away from hotzone
Serious hazard during a leak is the
Static electricity up to 24,000 volts
It is recommended that the FD ___ crimp or clamp leaks. Unless, life saving situation
Should not
Most cases prior to shut off the best course of action is
No action, don’t cover any pipe that is leaking
No persons enter a trench that is ___ that is not shored
5 ft
To protect utility workers, units should position up wind with a
20 lb dry Chem and a charged hose line
Street valves should
Not be used
ERG suggest an evac distance of
330
Crimping or clamping a leak should only be considered for lines that are
3/4 of an inch
Several ft from leak, dig a hole to expose line away from any readings. Lines could be ____ deep
24inches deep
Use grounding spray or ____ then safely clamp the line
Wet towel
Bare steel diameters range from 3/4 of inch to 8 inches with pressures up to
60psi
Wrapped steel maybe from 3/4 of inch to 20inches with pressure up to
1,440psi
PVC or polyethylene pipe is susceptible to
Static electricity
With a gas line on fire you should
Protect the exposures
For burning gas meters ___ should be deployed on a wide fog pattern
Two hose lines
Initial alarm for inside has leaks
2 engines one truck or rescue BC
When IDLH atmosphere is identified an ____ shall be identified
Initial RIT AND POSSIBLE STRUCTURE RESPONSE
Initial alarm for inside gas leak
2 engines, 1 truck or rescue 1 BC
Tasks that should be completed by the assigned units
Evacuate citizens
Monitor atmosphere
Exposure protection
Hazard mitigation safely
Ventilation
All ____ should be turned on before entering the IDLH
Intrinsically safe equipment
Where concentrations are the highest, _____ should be started immediately.
Ventilation
Secure _____ before operating the electric panel.
Generator
Upper stories, attic, and cocklofts need to be monitored due to
Vapor density of natural gas .55
Personnel encountering an odor should assign a resource to investigate
The roof, hvac
The regular to a meter takes street pressure of 40psi to
1/2, 1/4 psi prior to the meter
In older houses gas lines in occupied areas will be no more than
1/2 psi after the regulator
In new occupancies, gas lines leaving the main regulator are ___ to ___ psi
2-5psi
There are two types of meters
Inside, outside
The piping vent will be within
5 feet of the vent on an inside wall
If the screen becomes blocked to an outside vent it has its own
Blow out relief
The meter valve is a ____ turn in the pipping prior to the regulator
Quarter turn
When the shit off on an inside residential installation cannot be operated, the gas should be turned off at the
Curb box
Firefighters shall not attempt to shut off gas service by operating the
Street boxes or manholes
A street box is located
Out in the street and should not be operated by FD
A curb box is located
Between the street and the residence
Look for ____ colored lines to find curb box
Yellow
Confirm gas is being shut off by noting
Extinguishment of blue flames or checking meter flow
Curb box is usually at a depth of
2’ to 3
Propane is a ____ mixed with natural gas and petroleum deposits in rocks deep under ground
Fossil fuel
Propane has a. Expansion ratio of
270:1
Vapor density of propane is
1.56 heavier than air
One gallon of liquid propane weighs
4.23 pounds
Propane has an LEL of ____ and a UEL of ______
2.3, 9.5
Propane in its natural form is
Colorless and odorless
Propane has an ignition temp between
920F and 1,120F
A person with a normal sense of smell should be able to detect a concentration in air of ___% pf the LEL
20
Mercaptan added at a rate of _____per 10,000 gallons of liquid propane
1lb
Specific gravity of propane (weight in water)
0.504
Cloud that is visible is ____ a product of but condensed moisture in the air that is ___ by the leaking product
Not, cooled
_____ should be used to determine if gas escaping and caused the problem
Earth probes
Propane being ____ heavier than air
1 1/12
_____ hoselines should be deployed with ___ fog pattern to disperse vapors
Two 1 3/4 lines, narrow fog
Gas leak with nothing found, the source of odor may be
J p or a trap in a drain building up sewer gas
____ or extreme flooding could cause gas leaks
Water main breaks
NEVER ______ has meter fires but protect exposures
Extinguish
