MINNESOTA JOURNEYMAN SPRINKLER FITTER
Exam Questions And Correct Answers| Latest
Update| QUESTION BANK
What is the coverage area for Light Hazard heads?
Standard Coverage Area:
NFPA 13: NFPA 13 (Standard for the Installation of Sprinkler Systems) typically specifies a
maximum coverage area of 225 square feet per sprinkler head for Light Hazard occupancies.
However, this can be reduced to 200 square feet in certain scenarios
What is the coverage area for Ordinary Hazard heads?
The coverage area for Ordinary Hazard sprinkler heads depends on whether you're discussing
Ordinary Hazard Group 1 or Ordinary Hazard Group 2 occupancies:
Ordinary Hazard Group 1 (OH-1)
Maximum Coverage Area: 130 square feet per sprinkler head is the typical maximum allowed by
NFPA 13.
Example Occupancies: Light manufacturing, warehouses storing non-combustible materials.
Ordinary Hazard Group 2 (OH-2)
Maximum Coverage Area: 100 square feet per sprinkler head is the typical maximum allowed by
NFPA 13.
Example Occupancies: Warehouses with high piled combustibles, parking garages, car
dealerships.
What is the coverage area for Extra Hazard heads?
,Typical Coverage Areas:
NFPA 13: NFPA 13 (Standard for the Installation of Sprinkler Systems) often specifies a maximum
coverage area of 90-130 square feet per sprinkler head for Extra Hazard occupancies.
Specific Variations: The exact coverage area depends on factors like the type of hazard, storage
arrangement, and the specific sprinkler listing.
What is the coverage area for ESFR heads?
100 sq ft
What is the coverage area for Storage heads?
100 sq ft or 130 sq ft
Minimum air pressure for a pressure tank
75 psi
What pipe sizes can feed 1½" hose lines and for what length
must be connected to mains at least 2½" in diameter
1" for horizontal runs up to 20'
1¼" for 20' to 80'
1½" for runs over 80'
What are the bulb colors for each temperature rating
ordinary - orange or red
intermediate - yellow or green
high - blue
extra high - purple
very extra high - black
,ultra high - black
How often is the interior of a pressure tank inspected
5 years for all, 3 years for tanks without corrosion protection
How often do you flow standpipes
5 years
How many heads can be taken off a cold weather valve
10
Hanger spacing from end of pipe
1" - 3'
1¼" - 4'
1½" and up - 5'
Duration of water supply for NFPA 13D systems
system demand times 10 minutes
Why is a check valve with a 3/32" hole in Clapper required to be installed in the system riser
below the test valve in freezer spaces
prevent evaporation of priming water into system
Maximum time allowed for water flow alarms to sound
5 minutes
, what pressure and flow are 1½" hose stations designed for
50 gpm at system pressure
class III and class I standpipe systems are designed for what pressures and flows
250 gpm @ 100 psi
class II standpipe systems are designed for what pressures and flows
100 gpm @ 65 psi
Acceptance tests required for dry pipe systems
hydro test, air test, alarm test
flow of a master stream is?
at least 250 gpm
bypass around check valve on tank shall be required to fill the tank in how many hours? what
is the minimum size of this bypass?
8 hours, 2" diameter
minimum amount of time to close a valve?
5 seconds
why is the eccentric reducer on the suction side of the pump?
Exam Questions And Correct Answers| Latest
Update| QUESTION BANK
What is the coverage area for Light Hazard heads?
Standard Coverage Area:
NFPA 13: NFPA 13 (Standard for the Installation of Sprinkler Systems) typically specifies a
maximum coverage area of 225 square feet per sprinkler head for Light Hazard occupancies.
However, this can be reduced to 200 square feet in certain scenarios
What is the coverage area for Ordinary Hazard heads?
The coverage area for Ordinary Hazard sprinkler heads depends on whether you're discussing
Ordinary Hazard Group 1 or Ordinary Hazard Group 2 occupancies:
Ordinary Hazard Group 1 (OH-1)
Maximum Coverage Area: 130 square feet per sprinkler head is the typical maximum allowed by
NFPA 13.
Example Occupancies: Light manufacturing, warehouses storing non-combustible materials.
Ordinary Hazard Group 2 (OH-2)
Maximum Coverage Area: 100 square feet per sprinkler head is the typical maximum allowed by
NFPA 13.
Example Occupancies: Warehouses with high piled combustibles, parking garages, car
dealerships.
What is the coverage area for Extra Hazard heads?
,Typical Coverage Areas:
NFPA 13: NFPA 13 (Standard for the Installation of Sprinkler Systems) often specifies a maximum
coverage area of 90-130 square feet per sprinkler head for Extra Hazard occupancies.
Specific Variations: The exact coverage area depends on factors like the type of hazard, storage
arrangement, and the specific sprinkler listing.
What is the coverage area for ESFR heads?
100 sq ft
What is the coverage area for Storage heads?
100 sq ft or 130 sq ft
Minimum air pressure for a pressure tank
75 psi
What pipe sizes can feed 1½" hose lines and for what length
must be connected to mains at least 2½" in diameter
1" for horizontal runs up to 20'
1¼" for 20' to 80'
1½" for runs over 80'
What are the bulb colors for each temperature rating
ordinary - orange or red
intermediate - yellow or green
high - blue
extra high - purple
very extra high - black
,ultra high - black
How often is the interior of a pressure tank inspected
5 years for all, 3 years for tanks without corrosion protection
How often do you flow standpipes
5 years
How many heads can be taken off a cold weather valve
10
Hanger spacing from end of pipe
1" - 3'
1¼" - 4'
1½" and up - 5'
Duration of water supply for NFPA 13D systems
system demand times 10 minutes
Why is a check valve with a 3/32" hole in Clapper required to be installed in the system riser
below the test valve in freezer spaces
prevent evaporation of priming water into system
Maximum time allowed for water flow alarms to sound
5 minutes
, what pressure and flow are 1½" hose stations designed for
50 gpm at system pressure
class III and class I standpipe systems are designed for what pressures and flows
250 gpm @ 100 psi
class II standpipe systems are designed for what pressures and flows
100 gpm @ 65 psi
Acceptance tests required for dry pipe systems
hydro test, air test, alarm test
flow of a master stream is?
at least 250 gpm
bypass around check valve on tank shall be required to fill the tank in how many hours? what
is the minimum size of this bypass?
8 hours, 2" diameter
minimum amount of time to close a valve?
5 seconds
why is the eccentric reducer on the suction side of the pump?
