ch06 standpipe and hose systems
TRANSCRIPT
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Chapter 6Standpipe and Hose Systems
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Objectives • List and describe the different types of
standpipes and the different standpipe classifications.
• List and describe the different standpipe system components.
• State when and where standpipes and hose systems are required in buildings.
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Objectives • Reference the design and installation
standards that apply to standpipes. • State the minimum standpipe system
design pressure and flow requirements.
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Objectives • Reference the inspection, testing, and
maintenance requirements. • Recognize the possible impairments to
standpipe systems.
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Introduction • A standpipe system may be a structure’s
only fire protection equipment.– Allows for rapid engagement with a fire– Essential for firefighting in tall buildings
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Introduction • A standpipe systems is a network of piping
and components that transports water through a structure for manual firefighting.
• Many fire protection strategies combine standpipe and automatic sprinkler systems.– Standpipes provide support to automatic
sprinkler systems when manual intervention is needed.
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Types of Standpipe Systems • The different types of systems are defined by
their operational and configuration features.• Operational = water availability
– Immediate– After activation permits water to enter pipe– Manually supplied through FDC
• Configuration = whether or not it ordinarily has water in the pipe
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Types of Standpipe Systems • Wet standpipe
– Water is in the pipe at all times.
• Required to support manual firefighting
– Environmental temperature must be at least 40ºF for installation.
– Found in internal stair towers of mid- to high-rise buildings © A. Maurice Jones, Jr./Jones & Bartlett Learning
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Types of Standpipe Systems • Automatic dry standpipe
– Contains pressurized air in the pipe– Environmental temperature must be at least
40ºF for installation.• System piping and hose valves can be stored at
lower temps.– Found in residential multi-family mid-rise
buildings
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Types of Standpipe Systems • Semiautomatic standpipe
– Contains pressurized air or atmospheric air in the pipe
– Water enters pipe through activation of remote control device.
– Environmental temperature must be at least 40ºF.
– Found in industrial complexes or public areas where features are exposed to varying weather
© A. Maurice Jones, Jr./Jones & Bartlett Learning
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Types of Standpipe Systems • Manual wet standpipe
– Contains water in the pipe at all times, but water is supplied from the building’s domestic system
– Domestic supply line usually not more than ¾ or 1 inch in diameter
• Serves as priming water to reduce time it takes for water to reach the hose valve
– Found in older mid- and high-rise buildings• Rarely newly installed in buildings due to arrival of
combined standpipe systems
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Types of Standpipe Systems • Manual dry standpipe (cont’d)
– Does not have an attached water supply
• Fire fighters must connect a water source to the fire department connection.
– Common in remote or freestanding structures such as parking garages where environment is hard to monitor
© A. Maurice Jones, Jr./Jones & Bartlett Learning
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Types of Standpipe Systems • Combined standpipe
and sprinkler systems– Designs will try to use the
standpipe system as the sprinkler supply line.
– Common in old buildings with existing standpipes and new buildings where standpipe design provides outlets for sprinkler system
© A. Maurice Jones, Jr./Jones & Bartlett Learning
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Types of Standpipe Systems • Combined standpipe and sprinkler systems
(cont’d)– Benefits to contractors/developers are
manageable designs, better use of space, cost savings
– Benefit to the fire department is ready access to sprinkler control valves and manual hose valves
– The NFPA formally adopted the combined system in 1971.
• NFPA has certain requirements for these systems
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Classification of Standpipe Systems
• NFPA 14, Standard for the Installation of Standpipe and Hose Systems– 3 general categories of systems
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Classification of Standpipe Systems
• Class I– Designed for use by
fire fighters or brigade personnel trained to handle heavy streams
© A. Maurice Jones, Jr./Jones & Bartlett Learning
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Classification of Standpipe Systems
• Class I (cont’d) – Common in high-rise buildings, open parking
garages, covered malls, underground buildings– System must deliver sufficient water at high
pressure to support manual firefighting.– Hose connections must have 2½-inch threaded
connections.• Hose valves may be fitted with smaller diameter
reducing caps.
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Classification of Standpipe Systems
• Class II– Equipped to give
occupants, fire brigade members, or fire fighters access to water supply through a hose system
– Lower pressure and volume than Class I or III
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Classification of Standpipe Systems
• Class II (cont’d)– Fire departments use only if absolutely
necessary.• Maintenance history is unknown.• Water supply cannot control fire past the incipient
stage.• Hose locations are in open areas.
– Careful consideration should be given to installing these systems.
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Classification of Standpipe Systems
• Class III– Incorporates Class I and II
requirements to provide equipment that can be used by fire department, fire brigades, and trained occupants
© A. Maurice Jones, Jr./Jones & Bartlett Learning
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Classification of Standpipe Systems
• Class III (cont’d)– Water and pressure requirements are same
as Class I, but safety issues are similar to Class II.
– Authorities may require Class I instead of Class II or III.
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Standpipe System Components
• Fire department connections overview– If the building has a standpipe or sprinkler
system. first responders will connect hose lines to the FDC.
• FDC is a coupling device on a building’s exterior.• Provides primary or secondary water source
– Check valve prevents water from leaving system.
– Protective caps or plugs prevent FDC from clogging with debris.
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Standpipe System Components
• Types of fire department connections– Wall mounted: FDC
breaches exterior building wall
© A. Maurice Jones, Jr./Jones & Bartlett Learning
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Standpipe System Components
• Types of fire department connections (cont’d)– Freestanding: FDC supply
line is buried underground• Extends out of ground to
connect to piping
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Standpipe System Components
• Types of fire department connections (cont’d) – Most FDCS are single inlet or double inlet
threaded.– When the FDC has more than one inlet, a
clapper swings between couplings.– “Quick connect” couplings use locks or cams
to couple with the hose.
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Standpipe System Components
• Location of fire department connections– FDC must be visible, recognizable, and
accessible.– NFPA 14 lists requirements for FDCs.– Other requirements may exist (e.g., jurisdictional).– Wall-mounted FDCs are preferred over
freestanding.– Freestanding FDCs may be necessary due to
topography, safety, and other factors.
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Standpipe System Components
• Fire department connection identification (cont’d)– FDCs must have ID
signs so fire fighters know what kind of system they supply.
– Signs should give information about inlet pressure requirements.
© A. Maurice Jones, Jr./Jones & Bartlett Learning
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Standpipe System Components
• Pipes and fittings– Components used to install systems must meet or
exceed adopted standards.• American Water Works Association, American Society for
Testing and Materials, American Welding Society, American National Standards Institute
– Materials are chosen considering the pipe schedule, type, and joining method.
– Fittings join piping and components together by various methods.
– Regardless of material, the purpose is to connect pipe and other system components.
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Standpipe System Components
• Gauges– Pressure gauges are important and required to
help determine available water pressure in a system.
• Installed at the top of each standpipe• Recommended for pressure-regulating devices• Should not be exposed to freezing temperatures• Must have a shutoff control valve and be able to drain
– Help determine the available water pressure in the system
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Standpipe System Components
• Valves– Many different types:
• Check valves• Control valves• Drain valves• Hose valves
© A. Maurice Jones, Jr./Jones & Bartlett Learning
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Standpipe System Components
• Valves (cont’d)– Pressure-restricting, pressure-reducing, and
pressure-control devices and valves• Allow boost pressure to be high but manageable• Special care must be taken with installation,
testing, and maintenance.• Flow tests must be performed at time of
acceptance and periodically thereafter.• Fire companies should identify properties with
these devices.
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Standpipe System Components
• Hose cabinets, hose, hose racks, and nozzles– Cabinet/closet: Mounted to the wall; holds fire
protection equipment– Hoses: Certain requirements for use, length, and
collapsible vs. noncollapsible– Hose racks: May require a listing depending on
size– Nozzles: May require a listing and must be able to
flow at low pressures
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Required Installations • Codes determine when to install a
standpipe system.– NFPA 5000, Building Construction and Safety
Code®
– NFPA 100, Life Safety Code®
– NFPA 1, Fire Code®
– ICC, International Building Code® (IBC®)• Refer to NFPA 14 for how to install
systems.
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Required Installations • Factors affecting installation:
– Building height above or below the level of fire department access
– Whether a sprinkler system is installed– Building use and occupancy– Occupant load
• NFPA and ICC consider time it takes for fire fighters to establish water supply for suppression efforts given these factors.
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Required Installations • Considerations
– Which adopted model code and referenced standard does the local, state, or other authority use?
– Any hazards that will present special challenges?
– Any exceptions in the code?– Any retroactive code requirements that impact
current work (for existing conditions)?
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• Requirements based on building height and levels– Building height above and below grade affects
a fire department’s ability to operate during a fire.
– NFPA 1 requires standpipe installation under certain conditions; NFPA 5000 has similar requirements.
– IBC® has its own special requirements.
Required Installations
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• Occupancy requirements– Factors regarding occupancy may generate
additional requirements.– NFPA 1, NFPA 101, NFPA 5000, and IBC all have
special requirements for assembly type occupancy.– Dimensions and open area of a building design of
this kind can affect standpipe requirements.• Performance stages over 1000 sq ft• Airport terminals higher than two stories or 100 ft in
dimension
Required Installations
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• Buildings under construction, rehabilitation, or demolition– Create access and fuel load problems for fire
departments– NFPA 1, NFPA 5000, and the IBC have special
standpipe installation requirements for these sites.– Hose connections and clearly marked fire department
connections equipped with plugs and caps are required.
– Temporary standpipes are required during construction.
Required Installations
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Design and Installation Standards
• NFPA 14– Most widely recognized document outlining
standpipe and hose design and installation requirements
– Adopted in 1915– Revised 28 times, but basic principles are
essentially unchanged
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Design and Installation Standards
• NFPA 14 (cont’d)– Cited by NFPA 1, NFPA 101, NFPA 5000,
and the IBC as the referenced standard– Establishes minimum requirements for
components, design, plans, installation, etc.– Discusses requirements for buildings under
construction• Additional requirements exist when using
IBC® model code.
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Design and Installation Standards
• FM Global’s Data Sheet 4-4N– FM is a leading fire engineering, research,
and risk organization.– Under certain circumstances designers will
use Data Sheet 4-4N as the basis for standpipe/hose system design/installation.
– “N” signifies FM has adopted an NFPA standard, but FM may have made modifications.
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Water Pressure and Flow Requirements
• Minimum and maximum pressure– Minimum: 100 psi at the hydraulically most
remote 2½-inch hose valve outlet; 65 psi at 1½-inch valve outlet
– Maximum: Multiple factors at play; fire department hoses are tested at 250 psi.
• Trained personnel may have trouble with over 175 psi.• Untrained individuals have trouble over 100 psi.• Maximum listed pressure for most components is 175
psi.
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Water Pressure and Flow Requirements
• Pressure requirements in high-rise buildings– Pressure and flow must overcome pressure loss
due to elevation changes.– Design professionals install pressure-control,
pressure-regulating, and pressure-restricting devices for safety and reliability at high pressure.
– At certain heights, pressure cannot be managed.• Subdivide into upper and lower zones.• Use high-pressure fittings and devices.
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Water Pressure and Flow Requirements
• Maximum and minimum flow– Class I and II: Minimum flow of 500 gpm;
another 250 gpm per standpipe riser where building floor areas are < 80,000 sq feet
• > 80,000 sq feet have additional gpm requirements– Class II: Minimum flow of 100 gpm
• No additional flow when more than one hose provided
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Water Pressure and Flow Requirements
• Maximum and minimum flow (cont’d)– Buildings with NFPA 13 sprinkler systems:– Maximum flow requirement of 1000 gpm– Buildings with no sprinkler system: 1250 gpm– Horizontal standpipes with 3 or more hose
connections require minimum of 750 gpm.– Minimum duration of water supply to meet
system demand is 30 minutes.
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Inspection, Testing, and Maintenance Requirements
• Hydrostatic and air test– Hydrostatic
• One of the first and most important tests• System is subjected to 200 psi of pressurized
water for 2 hours and then allowed to drop to zero to ensure valid test.
– Air• Dry standpipe systems are subjected to 40 psi of
air pressure for 24 hours to ensure no leaks.
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Inspection, Testing, and Maintenance Requirements
• Hydrostatic and air test (cont’d)– If weather prevents hydrostatic testing, air test
is interim measure of integrity.– Many jurisdictions require both tests for dry
systems.• 200 psi of water and 40 psi of air pressure• If a dry system is supplied water through a dry pipe
valve, a dry pipe valve test is also needed.
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Inspection, Testing, and Maintenance Requirements
• Visual inspection– Occurs in conjunction with hydrostatic test and is
just as important– Includes:
• Checking for leaks• Verifying components installed correctly• Ensuring components are ones chosen by designer
– Occurs at floor level– Failure to complete can result in system damage,
injury, or fire department delays.
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Inspection, Testing, and Maintenance Requirements
• Flushing– Flush the system to remove dirt, debris, etc.,
before attaching it to a water service.– Inspector observes underground fire service
mains and lead-in connections while they flow water.
• Outlet used to flush matches pipe being flushed.• 10 ft/sec is recommended rate.• Flush until water is clear.
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Inspection, Testing, and Maintenance Requirements
• Flow tests– Tests ensure designed performance is met and
required flow and pressure are available.– Water is flowed from the hydraulically most
remote valve outlet.– Test usually occurs on the roof.– A fire apparatus (pumper) may be needed to
pump through FDC to verify a manual standpipe and system demand.
• Verify pressure-regulating valves if present.
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Inspection, Testing, and Maintenance Requirements
• Main drain test– Main drain is always available in combined
systems or systems with automatic water supply.
• Removes water – As main drain valve is opened fully, system
gauges display static and residual pressure readings.
• Compare these to previous readings.
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Inspection, Testing, and Maintenance Requirements
• Operation of components– All system components capable of manual or
automatic movement must be tested under actual operating systems.
• Usually just requires unscrewing a cap or turning a valve
• Ensures the system will operate when needed
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Inspection, Testing, and Maintenance Requirements
• Periodic inspection, testing, and maintenance– Even if they have never been used, all systems
must be ready for an emergency.– Inspection and testing occur at defined intervals.
• When components sit idle, operational condition is unknown.
– There are many impairments to firefighting, some system related, some not.
• Such as barrier to access
– At a minimum, follow schedules in NFPA 25.
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Summary• In many structures, a standpipe and hose
system is the only fire protection system required and available to fire fighters for manual firefighting.
• Generally, the height, area, occupancy, and hazard determine when a standpipe is required in a new structure.
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• NFPA 14 is the standpipe design and installation standard referenced by all model code organizations. This standard establishes the three standpipe system classifications; discusses the five different types of standpipe systems; and provides design, installation, use, outlet size, and water supply requirements.
Summary
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Summary• Achieving minimum water supply pressure
and flow requirements for a standpipe system is critical because pressures and flows below could render some fire department and standpipe system equipment unusable. This is especially true when dealing with high-rise buildings where loss of pressure due to elevation creates design and operational challenges.
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Summary• Fire department connections are a very
important system component; engine companies should be sure they are clearly visible and operational when needed.
• Devices that control pressure are another important standpipe system component requiring identification, documentation, and monitoring for proper inspection, testing, and maintenance.
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Summary• Witnessed inspections and tests during the
installation and throughout the life of any standpipe system is critical; failure to inspect, test, and maintain a standpipe system could be extremely dangerous to fire fighters, especially when a problem is discovered too late to solve.