components water main dcva – double check valve assembly fire department connection (fdc) ...
TRANSCRIPT
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FIRE PROTECTION SYSTEMS
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Fire Sprinkler Systems
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Fire Lines
ComponentsWater mainDCVA – Double Check Valve
AssemblyFire Department Connection (FDC)Indicator Valve Assembly
Post Indicator Valve (PIV) Wall Post Indicator Valve (WPIV)
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DCVA Control Valve
Check Valve
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Fire Department Connections
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City of Bothell Requirements
Locations of FDCs Within 50 feet of structure. Within 50 feet of a fire hydrant. (Outside of the Downtown Sub
area) Can be combination or single use. Painted Labeled for type and address (If needed)
As the downtown sub-area becomes more densely developed,
you will see more wall mounted connection and control points.
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Indicator Valve AssembliesPost Indicator Valve.
Wall Post Indicator Valve. Outside Screw and yoke
Purpose: To control the flow of water to the fire protection system. Visible indicator of the position of the device.
OPEN/SHUT Visible screw threads
Security Chains Tamper device
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General Design Standard for the City of Bothell
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General Design Standard for the City of Bothell
Feed from main
Check Valve
Control Valve
FDC
PIV
Fire Line
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Fire Suppression Riser
• Purpose• To control and distribute the water to the suppression
devices.• To allow reporting to a notification device of tampering
or water flow.• Risers come in many forms, from a standard wet pipe
riser to much more complicated systems.
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Shot Gun Riser
Water is in the system at all times. Released by the activation of a sprinkler
head.
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Wet Pipe Risers
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Riser in Normal Condition
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Riser in Pre-alarm Condition
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Riser in Alarm Condition(Water Flowing)
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Sprinkler Systems
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Dry Pipe Riser
Used for areas subject to freeze. The piping above the valve assembly has
no water in it. Usually has an air compressor to hold
back the water from entering the pipes in non-alarm conditions.
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Dry Pipe Riser
Valve Cap
HingeWater Inlet
Dry area of
riser
Latch
Pressurized AirFace Bolt
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Basic Principle Heat from combustion breaks the bulb or
fusible link on a sprinkler head. Pressurized air in the branch and main lines
travels through the system escaping through the opened sprinkler head or heads.
Air from the system leaves the main chamber of the riser valve.
Release of the pressurized air allows for the valve to lift off the inlet.
Water moves from the main line into the system lines.
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Special Requirements
Time constraints for air to leave the system and water to reach the sprinkler head. NFPA 13 – 60 seconds of less for water
delivery. If the system takes too long…
An “Accelerator” may be needed. Air compressor to keep pressure in the
system and keep the main alarm valve from opening.
Signal to alarm system when system goes “WET”.
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Pre-Action System
Usually used for areas within a building that may need special application due to sensitive equipment or where accidental activation is undesired.
Pre-action systems are hybrids of wet, dry, and deluge systems, depending on the exact system goal.
There are two main sub-types of pre-action systems: single interlock, and double interlock.
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Pre-Action
Single interlock systems are similar to dry systems except that these systems require that a “preceding” fire detection event, typically the activation of a heat or smoke detector, takes place prior to the “action” of water introduction into the system’s piping by opening the pre-action valve, which is a mechanically latched valve.
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Pre-Action
Double interlock systems are similar to deluge systems except that automatic sprinklers are used.
These systems require that both a “preceding” fire detection event, typically the activation of a heat or smoke detector, and an automatic sprinkler operation take place prior to the “action” of water introduction into the system’s piping.
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Pre-Action
Activation of either the fire detectors alone, or sprinklers alone, without the concurrent operation of the other, will not allow water to leave the piping system.
Because water does not enter the piping until a sprinkler operates, double interlock systems are considered as dry systems in terms of water delivery times, and similarly require a larger design area.
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Pre-Action
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Deluge System
In these systems, sprinklers are open at all times. There is NO fusible link or temperature
sensitive bulb.
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Deluge System A fire detection device
controls the main valve. Very similar to a pre-action
system. When the system is activated,
the valve opens, allowing large amounts of water to flow through all of the sprinklers.
They are usually used in facilities that contain hazardous materials such as: flammable liquids, chemicals, and explosives.
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Standpipe System
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Standpipe System
A system of pipes and connection points. Mainly used to extend the reach of hose
lines. Typical connections are 2 ½ inch and 1 ½
inch. Connections are normally located in
stairwells. Can also be found in hallways, roofs and
places where the spacing between access points exceeds 300 feet.
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Standpipe System
Systems can be as complicated as the building and its contents
require.
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Standpipe System
System can be normally dry.Supplied by water from a fire
apparatus. System can be normally wet.
Supplied by water from the fire line.Supplemented with water from a fire
apparatus. System can be a combination.
Combined with the sprinkler system.
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Standpipe System
Class I – A Class I standpipe system shall provide a 2 1/2 inch hose connection for use primarily by trained personnel or by the fire department during initial response. This class has no hose attached.
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Standpipe System
Class II – A Class II standpipe system shall provide 1 1/2 inch hose stations to supply water for use primarily by trained personnel or by the fire department during initial response. These are typically found in cabinets with 100’ of hose.
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Standpipe SystemClass III – A Class III standpipe system shall provide 1 1/2 inch hose stations to supply water for use by trained personnel and a 2 1/2 inch hose connection to supply a larger volume of water for use by fire departments and those trained in heavy fire streams. Many times these connections will provide a 2-1/2 inch reducer to a 1-1/2 hose connection.
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Special Extinguishing Systems
FM-200 An extinguishing system that utilizes a
chemical extinguishing agent. The agent is less hazardous than Halon. Leaves no residue on equipment. Uses a interlock release system.
Usually smoke detectors. Countdown timer to allow for escape from the
room prior to release. Manual activation and abort buttons. Visual and audible alarms.
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FM-200 System
Extinguishing agent canister
Discharge Nozzles
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FM-200 SystemTemporary abort button
Manual Activation button
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Kitchen Hood Systems NFPA 96 Standard for Ventilation Control and Fire
Protection of Commercial Cooking Operations NFPA 13 Standard for the Installation of Sprinkler
Systems NFPA 17 Standard for Dry Chemical Extinguishing
Systems NFPA 17A Standard for Wet Chemical
Extinguishing Systems UL 300 Standard for Fire Testing of Fire
Extinguishing Systems for Protection of Commercial Cooking Equipment
UL 710 Standard for Exhaust Hoods for Commercial Cooking Equipment
These are just some of them.
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Kitchen Hood Systems Why do we need hood extinguishing systems?
What are some of the hazards associated with kitchen cooking?
How frequently are hoods to be cleaned?
How frequently are the suppression components to be serviced?
What types of extinguishing agents are used?
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Kitchen Hood Systems
NFPA 96Cleaning schedule
Monthly - Facilities that serve solid fuel cooking need to be cleaned.
Quarterly - Facilities that serving high volume cooking like 24hr restaurants and wok cooking .
Semi- Annual - Facilities that serve moderate volume cooking to be cleaned.
Annually - Facilities that serve low volume cooking like churches, day camps, senior centers.
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Kitchen Hood Systems
Typical System Layout
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Kitchen Hood Systems
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Kitchen Hood Systems
Grease build up on roof
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Kitchen Hood Systems
A dirty hood system
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Kitchen Hood Systems
Grease baffle filters
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Kitchen Hood Systems
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Kitchen Hood Systems
A duct with heavy build up
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Kitchen Hood Systems
A Cleaned duct
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Kitchen Hood Systems
Concerns of a dirty hood system.Build up of grease from grease
laden vapors. Producing a highly combustible fuel
load.Grease is a corrosive material that
over time can weaken or destroy structural members.
Rapid fire spread.
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Kitchen Hood Systems
Activation process Detection of a fire
Fusible link Shut down of gas supply and/or electricity of
heat sources Shut down of make-up air. Notification to FA panel
Fire alarm activated. Activation of suppression chemical. Extinguishment of fire.
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Kitchen Hood Systems
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Fire Detection and Notification Systems
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Types of Systems
Conventional panel Reports location of fires by “zones” Different types of signals
Water flow Smoke Heat detector Manual Pull Trouble Supervisory
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Conventional systems
Control Panel
Flow switch
Annunciator Panel
Manual Pull
Station Smoke detector
Horn/Strobe
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Addressable Systems
Monitors each individual device. Reports
Detector activation Trouble Supervisory
Displays specific information Detector location Type of detector Supervisory signals
Duct detector activation Trouble signals
Missing devices Power failure Communication error
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Addressable PanelsPanels come in a wide variety of styles
and abilities.
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Addressable Components
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System Particulars
Each device is in constant communication with the panel.
Panel can identify the location and condition of the device.
Can monitor other devices such as VESDA and Special extinguishing systems and Smoke Control.
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Communication Methods
International Fire Code 2009 allows for alternate methods of communication with the monitoring station.
What does this mean?
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New technology is now replacing some of the long standing modes of communicating with the monitoring station.
POTS - Copper wire Digital Dialer DAC – Digital Alarm Communicator STU – subscriber terminal unit
New technology must meet NFPA 72 standards RF – Radio Frequency Cellular – cell system IPDAC – Internet VOIP
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VESDA
VeryEarlySmokeDetectionApparatus
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VESDA
Can be used where due to sensitive equipment,
early detection is
needed.
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VESDA
How it works Constantly “sniffing” the air. Uses a high
efficiency aspirator. Detects minuscule amounts of smoke by the
use of a laser. Alerts in a pre-alarm and alarm manner.
Multiple levels of alarm are available before a full alarm is activated.
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VESDAAspirating smoke detector (Laser type).
Pipe Network