General questions Flashcards
MN Test
What is the minimum operating pressure for sprinkler heads?
7 PSI
A PRV is set to what pressure?
175 PSI
What is the minimum discharge of a residential sprinkler head?
18 gpm
What distance should a hose valve be off of the floor?
3 to 5ft
Distance the FDC should be off the ground?
18 in to 48 in
What is the Minnesota State Fire Code
299M
What is the max zone square footage for extra hazard occupancy?
25,000 square ft
What is the max distance between hangers for 1 in sch 40 pipe?
12 ft
Who invented pipe calculations?
Hazen Williams
How much weight should a single hanger support?
Five times the weight of water filled pipe plus 250 pounds.
How many gauges are on a dry system?
2
What is the pitch of pipe on a dry system?
1/2” per 10ft on branch lines
1/4 per 10ft on mains
How many heads do you calculate on an NFPA 13R system?
4
What is the Maximum time for a compressor to fill a dry system?
30 minutes
Post indicating valves should be at least how many feet away from a building?
40 ft
When does the journeyman license expire?
June 30th every year
What are the conditions of the small room rule?
Light hazard occupancy
Less than 800 square feet
A head can be up to 9 ft off of one wall
Universal code that deals with fire protection?
Uniform fire code
What is the minimum protection area for ESFR heads?
80 square feet
What materials are left for the owners after a job is completed?
NFPA25
As Builts
Instructions on products
What clearance is needed around pipe in a pump house that passes through a wall?
1 inch
What areas can be omitted in NFPA 13R?
Bathrooms under 55 square feet
Closets under 24 square feet
How many heads are allowed on a branch line on either side of a cross main?
8
How many heads on a system before a FDC is required?
20 heads
When a system is calculated where do you start?
The most remote location?
Sprinklers under glass or plastic skylights shall be what temperature classification?
Intermediate
Residential sprinklers shall be spaced to a max spacing of?
144 square feet
What is a manual standpipe?
A standpipe that relies solely on the FDC to supply system demand.
