Water Systems Flashcards
(44 cards)
What is the minimum gpm for dry standpipe risers?
4-6” 500 gpm
How many inlets are there for a dry standpipe 6 or more stories?
4
The outlets on dry standpipes are what kind of valve?
Globe valve or gate valves
How many dry standpipes are needed in a pre ‘60?
Enough to cover the building with 100’ of hose and a 30’ stream
Pre ‘60 wet standpipes are what diameter?
1.5-2.5”
What is the flow requirement for wet standpipes on the roof of post ‘70 high rises?
35 gpm at 30 psi
High rises greater than 150’ built between 1960-74 have what type of standpipe system?
Combination
Combination standpipe risers must have how many FDC’s and is rated at how many GPM?
4 inlets for 2 risers, 250 gpm per inlet
6 inlets for 3 or more risers
Each riser rated to 1000 GPM
Each outlet rated to 300 GPM
What will be in the hose cabinets of combination systems above the 5th floor?
100’ of 2.5” hose with a 1” tip
What is usually installed in combination systems to keep the pressure regulated when there are minor leaks in the system?
Jockey pumps
What do orifice plates regulate pressure and gpm to?
200 gpm @45 psi
When no water is flowing it will equal system pressure
On wet standpipes, if the outlet pressure is greater than 70 psi, what is required and what shall the pressure be?
A pressure reducing valve to lower the pressure to 50 psi at the nozzle
Post ‘74 all buildings over what height shall be sprinklered?
75’
Post ‘74 A pressure reducing valve is required if the outlet pressure is greater than what?
150psi
In post ‘74 high rises the upper floors may have what kind of pressure regulating device?
Orifice plates
On post ‘74 high rises, pressure regulating devices are set to what psi providing how many gpm?
100 psi providing 300gpm
In post ‘74 high rises, wet standpipes with hose are not required if the building has what?
2.5”-1.5” reducer with a cap and chain on the 2.5” outlet
What is the requirement for on site water supply of a post ‘74 high rise 75’-150’?
Sprinkler flow for one floor of the building for 30 minutes plus 100 gpm for the standpipe
What is the on site water supply for a post ‘74 high rise 150’-275’?
500 gpm for first riser plus 250 gpm for each additional riser for 30 minutes.
What is the on site water supply required for post 74 high rises greater than 275’
Minimum 45,000 gallons
Maximum 105,000 gallons
What is the requirement for on site supply tank filling?
6” pipe fills tank in less than 8 hours
Buildings under construction require what kind of standpipe?
Buildings 6 or more stories require 1 dry standpipe when the construction reaches 50’. The standpipe shall extend to not less than 1 floor below the top floor of construction.
If equipped with a jockey pump, how much lower psi shall the main pump be set to turn on?
At least 5 psi lower
What shall the capacity of the fire pump be?
150 percent greater than the rated pressure
