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25 Cards in this Set

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  • Back
Define hazardous energy.
Stored potential energy that will cause harm if suddenly released.
List four ways to categorize the status of hazardous energy.
Stable--not likely to change
Stable--may change
Unstable--may require attention
Unstable--requires immediate attention
Hazards of Power Lines
Under tension, arcing, recoil, grounding to fences, etc.
Hazards of Pole Mounter Transformers
Difficult to extinguish, drop/dangle, dripping hot oil.
Hazards of Pad-Mounted transformers
High amperage, energizes surrounding surfaces, poled water conducts, arcing.
Hazards of Ground level vaults
confined space, O2 deficiency, build-up o f explosive gases, arcing.
Hazards of Subterranean vaults
same as ground level vaults – can “launch” manhole covers
Hazards of Generators
Power source, heat generation, hazards of fuels, automatic start-up.
Hazards of Batteries
stored energy, chemical/spill hazards, explosive gas build-up, exposed terminals
Hazards of Disconnects/Switches/meters
Exposed terminals, arcing
What is a “ground gradient”?
Electrical energy that has established a path to ground through the earth and is energizing it.
Why are UPS battery rooms hazardous?
UPS battery rooms are hazardous because of the presence of direct current (DC) power for the batteries. Pooled water, battery acid, and battery rack hardware can become DC energized because there is typically no ground fault protection with DC power.
Chemical properties of Propane
Vapor density of 1.5, boiling point of -44F, ignition temperature of 871F, flammable range of 2.4 to 9.5.
Chemical properties of Natural Gas (methane)
): Vapor density of .55, boiling point of -259F, ignition temperature of 999F, flammable range of 5.3 to 14
List the hazards associated with utility water and storm sewer systems
Collapse of Buildings.
Undermine Roads.
Extinguishing pilot lights and bubbling gas.
Powerful flow that can sweep up debris.
Powerful vortex that can pin humans to hidden grates underwater.
Give examples of mechanical hazardous energy.
Springs, cables, pulleys, high-rack storage units, counterweights.
What are hazards of Stability/position in vehicles?
Rolling weight, instability, collapse (crush), failure of ground to hold the load.
What are hazards of Fuel systems in vehicles?
of fuels, storage, pumps, fuel lines, pressurization
What are hazards of Electrical systems in vehicles?
Batteries, converters, high-voltage wires.
What are hazards of Power generation systems in vehicles?
Pulleys, belts, heat, noise, thrust, exhaust gases
What are hazards of suspension/door systems in vehicles?
Springs, shocks, gas or pneumatic struts
What are hazards of Drive/brake systems in vehicles?
Pressure vessels, heat, springs, torsion, exotic metal fumes.
Restraint safety systems (air bags)
10. What are the four considerations that need to be evaluated when considering weather as a hazardous energy?
Temperature, humidity, wind, and potential for change
List some warning signs that extreme weather is approaching
Watch sky – cloud changes.
180 degree wind shift.
Prior rain saturation – to predict flash floods.
Developing thunderstorm (wall clouds).
Lightning flashes and thunderclap timing
List several sources of miscellaneous hazardous energy
Earthen materials (sand, gravel, stone, clay, and like materials), ice, flowing water (streams, canals, storm drainage), and even animal movement can present significant hazards to firefighters.