High Rise Water Systems Flashcards
Pre-60 inlets
(2) 2 1/2 inlets if 4-5 stories. (4) 2 1/2 inlets if 6 stories or more
Pre-60 riser
4-6 inch riser rated at 500 GPM per riser
Pre-60 Classes
Class 1 Dry, Class 2 Wet
60-74 less than 150 feet?
Same as Pre-60
60-74 above 150 feet?
Class III Combination Standpipe
60-74 inlets
(4) 2 1/2 inlets. (6) 2 1/2 inlets if 3 or more risers
60-74 risers
6 inch riser rated at 1000 GPM per riser
orifice plates
metal like washer device designed to lower pressure rated at 200 gpm at 45 psi.
orifice plates found at pressures above ___
135 psi
60-74 water supply
primary - domestic / secondary - LAFD
74 to Present 75-150’
Damp system, On site water calculated sprinkler flow of most demanding area for 30 minutes + 100 GPM
74 to Present 75-150’ (Pressure Restricting Valve)
found when pressure is between 135 to 150 PSI
74 to Present 150-275’ onsite water
Calculated for standpipe demand + 500 GPM for 1st riser and 250 GPM for each additional riser.
74 to Present over 275’ onsite water
45K - 105K gallon water tank
74 to Present over 150 (Pressure Regulating Device)
Found when pressure exceeds 150 psi, provides 80-125 psi at 300 GPM
Mercoid pressure switch
the policy in LA for the Stop pressure is set 10 psi below system pressure and START pressure is set 50 psi below the system pressure
Dry standpipe outlets are located based on requirement
That every point within the structure must be reachable by a 30’ stream of water from a nozzle attached to 100’ of hose
Jockey pumps
installed to make up minor leakages rates in system pressure.
Jockey pumps prevent
the fire pump from continually starting and stopping due to the minor fluctuation in the system pressure
Looped system (except 1983 - 1988 )
water for a given sprinkle head is delivered from two or more risers
Exception to the looping between 1938-1988 was due to the
Uniform building code in 1983
Uniform building code in 1983
did not require two separate points of connections for sprinklers
Buildings under construction…. every building ____ stories or more shall be provided with not less than ___ standpipe for use during construction
6 stories or more, Not less than 1 standpipe
The standpipe shall be installed when the progress of construction is not more than ____ in height
50’
