Water Systems Flashcards
Prior to 1960, there was a height limit of ___ feet or ___ stories
150 or 13 stories
Pre 1960 consisted of how many water systems and what kinds
- Dry standpipe, interior wet standpipe, and sprinkled basements
Dry standpipes in pre 1960 buildings are how many stories
4
Dry standpipes from 1960 to 1974 must be how many stories in height but not exceed how many feet
4 or more stories and not exceeding 150
Dry standpipes in buildings after 1974 must be how many stories in height and not exceeding how many feet
4, 150
Dry standpipe are how many diameter pipe and must flow how many GPM
4” to 6” and flow 500 gpm
Dry standpipe have how many inlets and what diameter
2-4 2 1/2 inlets
Pre 1960 4 or more stories have what kind of standpipe
Class I Dry
You can tell a building is
Pre 1960
Because it will
Have
Exterior fire escapes
Pre 1960 buildings will have sprinklers installed only where
Basements
Pre 1960 dry standpipe have pressure control devices T/F
False. It is important pressure be delivered to the system by fire department operators
Dry standpipe outlets are located where and require what
Every floor except for the first floor. Outlets are located based on requirement that every point must be reachable by a 30 degree stream from a nozzle attached to 100ft of hose
Buildings prior to 1960 have what kind of valves
Gates or globe
Wet (class II) standpipes are required in buildings how many stories in height and are equipped with what
3 and are directly connected to a water supply and are equipped with 1 1/2 outlets with hose and nozzle
Class II standpipes are supplied by which sources
Domestic water system or gravity feed or pressurized tanks
Buildings constructed prior to 1960, wet standpipe risers are what in diameter.
1 1/2 to 2 1/2
Buildings prior to 1960 have risers supplied by which mains
The city mains. There are no inlets for fire department use
A building prior to 1974 that is how many feet in height is considered a high rise
150ft
Buildings over 150 ft in height that are built after 1960 are required to have what kind old standpipe
Class III combination
Combination systems are equipped with what outlets
2 1/2 outlet with 1 1/2 reducer with hose and nozzle
Combination standpipes have have what size outlets for fire department use
2 1/2 outlets
For each floor above the fifth floor, a class III system will have what
100 ft of single jacketed unlined 2 1/2 hose with 1” tip attached to 2 1/2 outlets
A building built 1974-present can be how many feet before it is considered a high rise
75
Combination standpipe risers are how many inches and flow how many GPM
6 “ and 1000 gpm
Combination standpipe risers have how many inlets with how many GPM at each
4, or if 3 or more standpipe risers, 6. A flow of 300 GPM is required for each 2 1/2 outlet
1960-1974 buildings over 150 require sprinklers in
The basement only
1960-1974 combination water system over 150ft water supply is
Not required
Orfice plates are required on standpipe buildings built between 1960 and 74 that do not exceed 150 ft in order to
Restrict the size of the opening of the outlet, thereby reducing the pressure when flowing
2 1/2 outlets require price plates if the pressure exceeds
135 psi
The current definition of a high rise in LA is
Any building over 75 ft measured to the floor of the top level designated for occupant use from the lowest floor
Buildings built after 1974 exceeding 150 ft have what kind of standpipe
Combined sprinkler
Combined sprinkler standpipes are required to flow how many GPM per riser
1000
PRV are used where
In buildings built after 1974 exceeding 75 ft in height to reduce standpipe pressure to working pressure
The PRV replaced what due to what
Office plates. Because office plates could not handle static pressure if the line was shut
The mechanism that reduces the pressure of the PRV is called what
Pressure regulating device
Pressure regulating devices are required in any standpipe where the static pressure exceeds
150 psi
Buildings over 75 ft in height that do not exceed 150 ft utilize what standpipe to supply sprinklers
Dry. And are fully sprinklered
Standpipe outlets in buildings between 1960 and 74 that do not exceed 150 ft use what standpipe system?
Dry
Buildings that’s exceed 150 built between 1960 and 74 use what kind of system
Combination
