Chapter 4 Flashcards
Mini new systems are considered combination systems. Combinations systems are comprised of what?
The sprinkler system and the stand pipe for the manual firefighting are supplied by the same standpiper riser
A standpipe is system is designed in what NFPA?
NFPA 14
The piping used to deliver the water into a standpipe system from its Supply is known as a?
Primary feeder
These Riser itself is a ______ feeder.
Secondary
The smaller piping that delivers the water to all of the actual standpipe Outlets or hose connections within the system.
Distributors
What class standpipe system is designed specifically for fire department use and has two and a half inch discharge Outlets?
Class 1 standpipe System
Class 1 standpipe systems are typically required for buildings of what height?
Three or more stories in height
A Class 1 standpipe system is required to deliver what rated flow and at what PSI?
500 gallons per minute at the top floor at an outlet pressure of 65 PSI residual for pre 1993 and 100 PSI residual for post-1993
What is a Class 2 standpipe
Designed for occupant use,
-Uses 1.5” discharge Outlets and sometimes has hose attached to the outlet
Only required to deliver 100 GPM
What is a class 3 standpipe?
A combination of class 1 and Class 2 systems and is designed for both fire department and occupant use
Define a class 4 standpipe system
Also known as a combined system, is simply a Class 1 or class 3 standpipe system that also supplies water to the sprinkler system
A dry standpipe system that has piping that is normally filled with pressurized air
Automatic dry standpipe system
A wet standpipe system, which has piping that is filled with water at all times and has an automatically available water supply capable of supplying the water demanded necessary for firefighting
Automatic wet standpipe system
Hey dry standpipe system that has piping that is normally filled with air that may or may not be pressurized
Semi-automatic dry standpipe system
A dry standpipe system that has piping that is normally filled with air, and these systems do not have a pre-connected water supply. A fire department connection must be used to manually Supply water for firefighting
Manual dry standpipe system
A dry standpipe system that has piping that has normally filled with water for the purpose of allowing leaks to be detected. A fire department connection must be used to manually Supply water for firefighting.
Manual wet standpipe system
Sometimes referred to as the fire department Siamese connection.
Fire department connection (FDC)
What size connections are most common in FDC’s?
2.5 in
What must be done before connecting supply lines to the fdc?
Clear the FDC of debris and trash
Pressures and excess of 250 psi are required for buildings above____ stories
30 stories
Pressures in excess of 300 PSI are required for buildings above____ stories.
40 stories
NFPA 14 recommends that a maximum pressure within the system at any point should not exceed ____.
350 PSI
In NFPA _____the pipe fittings and valves used for the standpipe systems are rated for pressures up to only _____ PSI.
14, 300psi
What valves control the flow of water throughout the standpipe
Post indicator valves, outside stem and yoke valves, check valves, and sectional control valves
What keeps water in the system from flowing backward and out into the piping up to the FTC
Check valve and piping from the FDC
What are the height requirement for standpipes?
3 ft to 5 ft
In the most recent edition of NFPA 14 the recommended location and placement of the standpipe connections is located where
On the half Landing in between floors
What is the most common valve within the standpipe system
Globe valve
When the static pressure at a hose connection exceeds _____, _____ is required
170psi
Pressure Regulating Device
Where are pressure regulating devices typically located?
At the Zone floor control valves for combination Sprinklers and standpipe systems
At the standpipe hose valve Outlets
What NFPA sets the standard for installation of standpipe and hose
NFPA 14
Which NFPA sets the standard for the installation of sprinkler systems?
NFPA 13
What are the three types of pressure regulating devices used in standpipe systems
Pressure restricting devices, pressure reducing valves, pressure control valves
Pressure restricting devices are sometimes referred to as?
Pressure restricting valves
_____ maybe inserted into Outlook connections to standpipe systems to reduce residual pressure on the downstream side.
Orifice plates
This mechanical device has a hose thread on both ends and resembles other types of Fire Department appliances.
Mechanical PRD
A device that works by limiting the valve from being fully opened.
Limiting PRD
______ are the preferred devices for regulating excessive pressures or pressure control and pressure reducing valves.
Pressure reducing valves (PRV’s)
Based on NFPA recommendations most fire codes have required pressure reducing valves for Outlets of systems or static pressure that could exceed____.
175psi
What is considered to be the most reliable method of controlling pressure?
Pressure reducing valves PRV’s
It can be defined as a ____ when there are internal components associated with its pressure regulation that cannot be removed
Valve
It can be defined as a_____ when there are either external components, such as limiting devices, or internal components such as an orifice plate associated with this pressure regulation.
Device
