Standpipe, FDC, Hydrants Flashcards
Standpipe system classes
Class 1
Class 2
Class 3
Class 1 standpipe system contains
2 1/2” hose connection, for trained personnel only
Class 2 standpipe contains
1 1/2” hose valves, intended for trained building occupants
Class 3 standpipe system contains
1-1/2” & 2-1/2” hoses valves, intended for FD use only
Class 2 and class 3 standpipe classes are supplied with what
100 ft of 1-1/2” hose
Nozzles that USED to be supplied for hoses in standpipes had
A 3/8 or 1/2” outlet that could not be shut off
Standpipe systems are generally designed by
An architect or engineer
All classes of standpipe requires valves on
Each floor
Hose valves shall be ____ from ground
Within easy reach, never over 5 feet
Never less then 3 feet
Class 1 standpipe systems located
-Each main floor landing
-at the highest stairway landing w/ access to roof
- hose travel distance must not be exceeded (130’ unsprinklered, 200’ for NFPA 13&13R)
Class 2 standpipe systems located
-The corridor or adjacent space to stairway enclosure
-every 130’
All new standpipe systems shall be tested at
200 psi, 2 hours, 0 psi loss Or 50 psi in excess of system pressure, whichever is greater
Standard fittings and hose valves are rated for a pressure up too
175psi
Standpipe system types
- Automatic or Manual Wet
- Automatic or Manual Dry
- Semi Automatic
- Combined
Automatic Wet and Dry standpipe system consist of
Wet - Full of water at all times, capable of supplying system demand at all times
Dry - Full of air until valve is opened, capable of supply system demand at all times
Manual wet and dry standpipe systems consist of
Wet - full of water at all times, relies on FD to supply system demand
Dry - full of air until valve is opened, no permanent demand, relies on FD to supply system demand
Semi-Automatic Dry standpipe system consists of
Attached water supply capable of supplying system demand utilizing a deluge valve which is activated by a remote device
Combination Standpipe system consist of
Supplies both hose connections and automatic sprinklers
Schedule 10 pipe is pressure rated for
300psi
How can standpipe be joined together
-grooved
-threaded
-welded
Where copper pipe is used
K,L and M can be used
Must be brazed
Hose valves shall have a minimum of ___ clearance around any part of the cabinet
2”
Standpipe system gauges located
Top floor of each riser
Class 3 standpipe systems located
-Locations comply with 1&2
-travel restraints for 2 do not apply
-
Standpipe system pipe size shall be a minimum of
4”
Combined systems in a partially sprinklered building shall have a minimum pipe size of
6”
Branch lines for standpipe systems shall not be smaller then
2 1/2” inch
If pressure exceeds 100psi on an 1-1/2 outlet, what is required
A pressure restricting device
Minimum pressure for most remote 2-1/2” outlet is
100psi
Minimum pressure limit for most remote 1-1/2” outlet
65psi
Minimum flows for class 1&3 (not out of hose connection, system demand)
- 500 gpm through 2 most remote 2-1/2” outlets
- 1000 gpm for fully sprinklered buildings
- 1250 gpm for buildings that are not fully sprinklered
Minimum flow rate class 2
100 gpm @ 65 psi from most remote hose connection
Max flow rate single 2-1/2” valve
250gpm
Max flow rate for single 1-1/2” valve
100gpm
Drain size for PRV testing
2-1/2 and less 1 pipe size bigger
3” and higher - same size
Ex. 3” drain pipe for 2-1/2” PRV
2” pipe for 1-1/2” PRV
Water supply shall be able to meet system demand for
30 minutes
Buildings under construction must have
Hose connection at each floor level exit stairway & connection for FD hose
The maximum pressure at any point in the standpipe system shall not exceed
350psi
1-1/2” hoses stations are NOT ____
Considered standpipe systems
1-1/2” hoses stations are generally installed for
Mop up after a fire
Minimum size pipe a 1-1/2” hose station can be taken off of is
2-1/2” pipe OR 2” when hydraulically calculated
Hand hose stations with horizontal runs <under 20 will have what size minimum pipe feeding it
1”