12 Fire Hazard Recognition Flashcards
Unsafe behaviors include
Poor housekeeping Ignoring ignition sources Open burning Improper use of electricity Careless use of flammable liquids
In general code requires I contained fires to not be within how many feet of a house
50 ft
Portable heating device generally found on construction sites
Salamander
Open burning fires should not be allowed when wind speeds are over
5 mph
5 common causes of electrical fires
Worn equipment Improper use Defective or improper installation Power surges Static
Movement of electrical current between two electrodes or conductors
Arcing
Condition where over using increases resistance and arcing occurs between the Armature and the electric magnetic field. Parking is the elements and ultimately ignition temperature of wire
Overloading
Brief spike In voltage usually lasting milliseconds.
Power surge
Non flowing electrical charge that can form on almost any surface
Static electricity
Common conditions That can generate static charges
Gas or steam flowing from an open pipe especially cryogenic.
Pulverize material traveling through shoots.
Slurry loading of materials including explosives
belts in motion.
Fluid running through pipes
Connection of two objects with a metal chain or strap in order to neutralize the static electrical charge between the two
Bonding
Reducing the difference in electrical potential between an object and the ground by use of various conductors
Grounding
Primary hazard associated with lumber yards and similar occupancies is
Hi fuel load
Conditions that allow lumberyard fires to reach serious proportions include the following
Large undivided stacks of materials. Congested storage conditions. Delayed fire detection. Inadequate fire protection. Combination of class a and class B
In open yard storage of lumber. Stacks must be located on solid ground preferably paved. To ensure stability The height of the lumbar stacked must not exceed what
20 feet
Driveways in a lumberyard must be spaced so that a maximum grid system of not more then what size is produced
50 x 150’
When certain high hazard commodities such as vehicle tires, plastics, flammable liquids, pallets, are stored over 6 feet in height the store just considered
Hi piled storage
Combustibles are considered high pile storage when they are stacked over what feet in height
Over 12 feet
Type of storage method or materials are stored on pallets. Some wood, some metal or plastic. Plastic increases to three times the fuel load compared to wood
Pallet storage
Consists of a structural framework onto which pallets or other materials are placed
Rack storage
Involves stacking boxes, bags, or the products themselves directly on top of each other, which may be done by hand or forklift.
Solid piling
Solid piling gives a fire the least chance to develop because it limits
Airspace between fuel units
Most critical system in a storage or rack system for an inspector to check and ensure the system is functional is
Automatic sprinkler system
An inspector must ensure that aisles are kept clear so that the material left on the floor will not help fire do what
Travel to the next rack of storage
Fires in tire storage facilities create toxic oil. This causes long-lasting pollution and what type of contamination
Groundwater
Weeds in vegetation must be cleared out to how far from any tire pile
Within 50 feet of clear
Discarded pallets can be the greatest hazard because they are broken up and can be exposed to
Uncontrolled fires caused by lightning wildland or intentional
Something that may cause and ignition to occur or create conditions that will contribute to the size or spread of a fire once it has ignited
Unsafe behaviors
Airspace between pallets is generally how high
4 inches
Materials inside of recycling facilities may not be static closer than how far from the ceiling in a building without automatic sprinklers
No closer than 2 feet
Material stored inside recycling facilities may not be stacked closer than how far from the ceiling in a building that has automatic sprinklers
At least 18 inches below sprinklers
Waste handling operations involve the disposal of
Non-recyclable materials
Most common cause of fire at waste handling facilities
Open burning and spontaneous combustion
Incineration can reduce the bulk of waste by as much as
95%
Fuel fired incinerators must be preheated for how long before use
30 minutes
When inspecting an incinerator what must be cleaned on a regular basis and disposed of appropriately
Waste material Ash compartment
The largest concern with incinerators is
Hazardous waste
In very large HVAC systems mechanical equipment such as the heater itself must be located in a room that is separated from the rest of the building by a fire resistance wall and door rated at a minimum of
One hour
True false no storage is allowed inside the HVAC system room
True
Greatest concern of fire hazard from HVAC systems
Fire hazards from heating appliances
Common causes of fires related to heating appliances include
Poorly adjusted or worn fan belts.
Clogged filters.
Lint or debris bear burners.
Poorly maintained motors
Another concern with the operation of HVAC systems
Spread of fire through air handling system
Combustion gases passed through tubes that are immersed in circulating water which is converted to steam. Type of boiler
Fire tube boiler
Type of boiler and is a steam generating unit in which steam and water circulate through a series of small drums and tubes. Combustion gases Passover outside of the elements
Watertube boiler
Almost all large boilers are of what type
Watertube boiler
Most common type of central heating appliance used today
Warm air furnaces
Type of furnace the operates primarily by the circulation of air without use of fans. Cold air settles into basement heated air rises
Gravity furnaces
Automatic controls are provided to turn off the furnace when the temperature was in the ductwork or Plenum reaches
250°F
Fire proms with warm air furnaces are principally do to
Inadequate clearances.
Lack of proper limit controls.
Heat exchanger burnouts
improper installation or maintenance
Self-contained devices that are automatically controlled. This heater may be mounted on the floor or suspended from a wall or ceiling. Found in manufacturing or storage or gymnasiums
Unit heaters
Type of heater that uses the circulation of radiant heat. Self-contained units designed to heat the immediate surrounding area
Room heaters
Wood and coal stove, electric and gas logs, electric baseboard and open front heaters are considered what type of heater
Room heaters
Class a refrigerants are not considered toxic when a person is exposed to concentrations of less than
400 ppm by volume
Class B refrigerants are toxic when a person is exposed to concentrations less than
400 ppm by volume
Air moving systems were no cooling or heating of the air occurs
Ventilating systems
Three types of filters used in HVAC systems
Fibrous media unit filters.
Renewable media filters.
Electronic air cleaners
Primary fire hazard associated with electronic air filters is
Electrical malfunction igniting particulate matter inside
Which class of HVAC system will burn moderately when clean and emit moderate quantities of smoke
Class two filter.
Class one filter won’t contribute fuel to a fire
Unless specially designed for lesser clearance, cooking equipment must have a clearance of how much for many combustible material
At least 18 inches
Dry chemical cylinders for cooking systems that way less than 150 pounds must be Hydro tested every
12 Years
Fusible links in cooking extinguishing systems must be replaced at least
Annually
Solid fuel systems like woodstoves must be installed on noncombustible floors and extend how far from the appliance in every direction
3 feet in all directions
Class of oven or furnace that operates in approximately atmospheric pressure with explosion or fire hazard potential one flammable volatiles are processed or heated
Class a
Type of oven or furnace that operates at approximately atmosphere condition or no flammable volatiles or combustible materials are heated
Class B
Type of oven or furnace with potential hazards due to flammable material used. Include a special atmosphere supply system with integral quench furnace and molten salt bath furnace
Class C
Type of oven or furnace that operates at temperatures from above Ambien to over 5000°F. Pressure is normally below atmosphere
Class D
The most common type of powered industrial truck is
Forklift
Most common type of forklift or industrial truck fuel
Electric battery and LPG
Chargers for electric battery operated units should be kept at least how far from combustible materials
5 feet
Must be a minimum of what distance between stake lines for tents
10 feet
Most common fuel gas used for metal cutting or thermal cutting is
Acetylene gas
The primary fire hazard associated with oxygen fuel gas equipment is
The storage of the oxygen and fuel gases in cylinders
Before welding or cutting operations can begin, when operating in an area where combustible materials such as paper clippings wood shavings etc. are on the floor an area with a radius of what size must be cleared
35 foot clearance radius
Following a welding or thermal cutting operation a fire watch must be maintained for at least how long after the job is completed
30 minutes
A firewatch must monitor adjacent areas to welding and thermal cutting in what circumstance
When walls or floor openings are within 35 feet
Another name for the type of work that involves welding thermal cutting etc.
Hot work
Process the most involves using an air spray gun that atomizes fluid as it is sprayed onto product
Fluid coating
Paint booths should be bonded and grounded so that
Static spark does not ignite vapors
Process where powder is suspended in air and then electrostatically charged. Product is then baked to cure coating
Powder coating
Major cause of fire in powder coating process
Static accumulation
Dip tanks and reservoirs should be contained with what fire rating construction
One hour container
Quenching oil should never be allowed to be with and what degrees of its flashpoint
50°
Normal flash point of various heated quenching mediums is
500°F
For heated quenching operations temperature ranges from
200-400°F
So that flammable liquids will not flow to lower levels quenching tanks should be located where
Grade level
Freeboard, distance from liquid surface to top of tank wonderful, should never be less than what height
6 inches
Tanks that contain how many gallons of quench oil or more should have drains to protect overflow
150 gallons or more
Any tank over how many gallons must have a bottom drain that opens automatically or manually in the event of fire
Any tank over 500 gallons
The floor or roof above a dry cleaning room must have a fire resistance rating of not less than
One hour
Dry cleaning room must have at least how many doors as a means of egress located at opposite ends of the room
Two doors at least
Dry cleaning room must be separated from the rest of the building by a partition with what fire resistance rating
Two hour fire resistance rating
At least two approved portable fire extinguishers must be provided near the doors and must be rated at
2-A:10-BC
Class I solvents for dry-cleaning have a flashpoint below what temperature
100°F
Combustible dust group, metal dust including aluminum magnesium and commercial alloys, hazardous in the use of electrical equipment
Group E
Combustible dust group of volatile dusts containing more than 8% carbonaceous material, includes cole carbon black charcoal and coke dusts
Group F
Combustible dust group of dust atmosphere is produced in flour grain wood flower plastic processing
Group G
Class to building combustible dust is an air hundred normal operating conditions in sufficient quantities to produce explosion. What division is it
Division I
class two building combustible dust produced due to abnormal operation and is present in quantities to produce explosion. What division
Division II
Means of dust control include providing enclosures for conveyor belts or reducing speed the grain movesmoves through facility
Passive dust control
Dust control that usually mechanical collection system capable of collecting 99.5% of dust and storing it in bins outside of facility
Active dust control
Subterranean tunnels and passageways of what length or longer must have two means of egress as remote from each other as possible in grain handling facilities
50 feet or longer
Most common place for fires to occur in woodworking operations is at or in
The dust hogger , catches splinters chips and saw dust
Asphalt and tar kettles must never be operated where
Inside a building or on its roof
A portable fire extinguisher rated at 40-BC must be located within how much of a candle for asphalt Or tar
25 feet
If a tar kettle is being used for roofing additional extinguisher of what size must be available
3-A:40-BC
Minimum size required portable fire extinguisher for clean rooms are
2 A-40 BC
