The distance between the hanger and the centerline of an upright sprinkler may be no less than 3". The purpose is to prevent the hangar from becoming an obstruction when the sprinklers discharge
Dry-pipe valves controlling systems with a capacity of more than _______ must be provided with an appro...
The distance between the hanger and the centerline of an upright sprinkler may be no less than
3". The purpose is to prevent the hangar from becoming an obstruction when the sprinklers
discharge
Dry-pipe valves controlling systems with a capacity of more than _______ must be provided
with an approved quick-opening device 500 gallons
Air or nitrogen pressure in a dry-pipe system must be maintained throughout the year
In a dry pipe system, install an approved relief valve between the compressor and the control
valve, and set it to operate at a pressure of _________ in excess of maximum air pressure for
the system 10 psi
a 4 inch, 90 degree elbow is equivalent to ______ of pipe in a hydraulically designed systems
10 ft There are two general methods for calculating pipe sizes for a sprinkler system. The first is
the hydraulic method, which takes into account the density and area of sprinkler coverage as
well as the characteristics of the water supply. It is the more precise of the two methods and
enables you to determine if the water supply is adequate for any given system. The second
method is the pipe schedule method which specifies the number of sprinklers allowed on each
side of a cross main, depending on occupancy rating. Pipe is sized by referring to schedules in
NFPA 13
In calculations for hydraulically designed systems, the design area must be The most
hydraulically demanding area
In hydraulically designed sprinkler systems, the minimum operating pressure for any sprinkler
must be ____ psi 7 psi
In Ordinary Hazard pipe schedule systems, what is the maximum number of sprinklers allowed
for a 3" pipe? 40 sprinklers
According to OSHA, a permit is required prior to excavation when the trench exceeds what
minimum depth? 5 feet
When digging a ditch 6 feet deep, how far from the edge should excavated soils be deposited?
24 inches
Each dry pipe valve should be trip tested ________ during warm weahter Annually
How often do you test priming water levels Quarterly
When testing the priming water level, what could be indicated by a discharge of air? The
priming water level is too low. When testing the priming water level the first step is to open the
priming test valve. If water flows out of the valve, it should be drained until the water stops
flowing and air discharges. If only air discharges when the valve is openeed , then the ptiming
water level could be too low and water should be added per the manufacturers instructions
,What is the maximum width of a trench before a bridge is required? 30". A bridge is
required when a trench is at least 6' deep and wider than 30"
In general, at what depth is trench shoring required? 5 ft
A ladder must be extended at least _____ above the landing platform 36"
The back-up alarm on heavy equipment must be audible from a distance of 200 ft
What is the maximum spacing for extended coverage sprinklers 20 ft. The absolute maximum
is 20 ft, but teh actual spacing depends upon the type of construction, the area to be protected,
and the hazard type.
What is the smallest pipe diameter on a branch line that requires bracing? 2-1/2 inch. Sway
bracing is used to prevent excessive movement of piping during events such as earthquakes.
Branch piping 2" and smaller is considered capable of significant movement without damage.
Which of the following should you consider when installing a sprinkler system in a Class III pile
of storage area Height of goods and type of goods stored. The procedure for designing a
sprinkler system in a pile storage area includes determining the commodity class for the goods
being stored, determining the density and area of application, and adjusting the density for
storage height. Goods packaged in cartons are generally class III
What type of sprinklers should you use in a clean room? Quick response sprinklers
What is the maximum arm over for 1" of pipe 36". Armover is the unsupported length of
branch piping between the last hangar on the line and the end sprinkler
What is the maximum armover for 1-1/4" pipe? 48"
How often do you check the system after 25 years of service? Once every 5 years. Dry pipe
and preaction systems with uncoated ferrous piping should be investigated
What is the minimum distance between a worker and a ladder when working in a trench?25ft.
Workers in a trench should never be more than 25 ft from a ladder. This means that ladders may
be spaced every 50 ft in a trench because a worker standing in the direct center between two
ladders will be only 25 ft from either one of them
Which of the following should you consider when laying underground pipe Fire resistance of the
pipe. You should also consider the maximum system working pressure, the depth at which the
pipe is to be installed, the soil conditions, the possibility of corrosion, and the susceptibility of the
pipe to other external loads, such as traffic or a building
A three story apartment building has 12,000 square feet on each floor, an underground parking
garage, and attic space on top. What square footage do you use to design the sprinkler system?
48,000 square feet. Each building story and the garage must be sprinklered. Attic spaces do not
need sprinklers if they are not used for storage or living spaces and do not contain fuel-burning
equipment
When is equipment grounding not required? If the equipment is double insulated
What should you take with you when working on a crane platform Only the tools needed for the
job
When should a contractor perform an underground flush test After connection to the
supply source and prior to connection to the system riser
If the system components are rated at 175 psi, what should the working pressure be set at?
175 psi. The system working pressure is the maximum anticipated pressure applied to
components. System components must be rated for the maximum system working pressure
they will be exposed to
, What events are required to activate a preaction double interlock electric pneumatic system?
Operation of a detection device and sprinkler head
In addition to the standard hydrostatic test, what air pressure test is required for a dry pipe
system? 40 psi for 24 hours
How often must you test a fire hydrant Annually. Fire hydrants must be lubricated annually
How often must you test fire sprinklers heads Every 10 years. In general, 10 years but
some specifics:
1. Where sprinklers have been in service for 50 years, they shall be replaced or tested. Testing
shall be repeated at 10 year intervals
2. Sprinkler manufactured using fast-response elements must be tested after being in service
for 20 years and must be retested every 10 years.
3. Dry sprinklers must be tested after 10 years and retested every 10 years
4. Solder-type sprinklers and sprinklers subjected to harsh environments must be tested every 5
years.
5. Sprinklers must be visually inspected from the ground level every year.
How often must you perform an underground main flow test Every 5 years. Both
underground and exposed piping flow tests must be performed every 5 years
How should diesel fire pumps be tested? Weekly for 30 minutes. All fire pumps must be
tested weekly without flowing water. Diesel pumps should run for 30 minutes. Electric pumps
should run 10 minutes
How often should a chemical extinguishing system be checked by a trained person? Every
6 months
How often should the pumps on a residential sprinkler system be tested Every year
When placing a ladder, the distance from the wall to the foot of the ladder should be equal to
________ of the distance from the ground to the top support 1/4
How many flexible couplings are needed if a pipe goes through a wall 2 couplings, within 1
ft of either side of the wall
How many flexible couplings are needed for a 4" stand pipe with a length of 4'-6" 1. Listed
flexible couplings are required on all pipes 2-1/2" or larger. Flexible couplings are required in the
following locations:
1. Within 24" of the top and bottom of all risers except risers that are less than 3 ft in length do
not require a flexible coupling and risers between 3 ft and 7 ft in length require only one flexible
coupling
2. Within 12" above and 24" below the floor in multi story buildings
3. If the piping serving the floor area is connected to the main riser below the flexible coupling,
the vertical part of the tie-in piping must have a flexible coupling installed at the same height as
the flexible coupling on the main riser
What is the maximum height of a wooden scaffold? 60 ft. The max depends of the type of
scaffold. Generally, the maximum heights are:
1. Wood - 60 ft
2. Tube and coupler - 125 ft
3. Tubular welded - 125 ft
4. Hourse (single or tiered) - 10 ft
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