2. 2
Fire Protection System Design
Strategy
ī¯ Comprehensive Strategy
īŽ Prevent fires from starting in the first place
ī¯ Education
ī¯ Administrative procedures
ī¯ Signage
ī¯ Inspections
ī¯ Fire safety program
īŽ Fire alarm and detection systems
ī¯ Detect fires early to initiate quick evacuation
īŽ Design safe egress from building
ī¯ Exits, Stairwells, Corridors
ī¯ Emergency lighting and ventilation
3. 3
Design Strategies (contâd)
īŽ Fire suppression systems
ī¯ Sprinkler
ī¯ Standpipe and Hose
ī¯ Chemical
īŽ Smoke Control systems
ī¯ Remove smoke from exits
ī¯ Provide fleeing occupants with breathable air
4. 4
Design Strategies (contâd)
īŽ Compartmentalization
ī¯ Break a building into small compartments to contain fire and
smoke
īŽ Fire Separation
ī¯ Fire rated wall, floor, ceiling assemblies that impede
the spread of fire
īŽ Use of non-combustible materials
īŽ Use of low flame spread and smoke developed
finish material
5. 5
Flame Spread
ī¯ ASTM E84 â Test Method for Surface-Burning
Characteristics of Building Materials (Steiner tunnel test).
Rates surface-burning characteristics of building materials
and interior finishes, and provides data on smoke density.
ī¯ Flame spread classifications:
īŽ Class A: 0-25
īŽ Class B: 26-75
īŽ Class C: 76-200
ī¯ Local building codes generally restrict use of materials in
different occupancies based upon flame spread and smoke
developed ratings.
īŽ For example, NYSED Manual of Planning Standards requires finishes
in corridors, passageways, stairways to be Class A.
7. 7
Fire Issues
ī¯ Products of combustion â CO, CO2, other
gases
ī¯ Fire quickly consumes oxygen
ī¯ Lack of oxygen
īŽ Rapid deterioration of human capabilities
ī¯ Muscle control
ī¯ Thinking, consciousness, etc.
ī¯ Poor visibility
8. 8
Fire Issues (contâd)
īŽ Vertical shafts promote spread of smoke, heat
ī¯ Elevators
ī¯ Escalators
ī¯ Atriums
īŽ HVAC systems can spread smoke
īŽ Windowless buildings â prevent entry by firefighters
īŽ Interior finishes â can spread fire, give off smoke
īŽ High rise buildings (g.t. six stories) â complicate
firefighting, rescue
9. 9
Fire Alarm and Detection Systems
ī¯ Design Standards
īŽ Fire Code of NYS â defines minimum standards where fire alarm and
detection system is required, general design requirements
īŽ NFPA 72 â National Fire Alarm Code â defines specific design
standards
ī¯ Functions of a fire alarm and detection system:
īŽ Initiate alarm
ī¯ Manually
ī¯ Automatically
īŽ Notify occupants
ī¯ Audible alarms
ī¯ Visual alarms
10. 10
Functions (contâd)
ī¯ Automatically signal fire department or central station
ī¯ Recall elevators
ī¯ Supervise special systems:
īŽ Fire pump operation, power availability
īŽ Sprinkler system status
ī¯ Unlock doors
ī¯ Automatically close doors that are part of fire separations
ī¯ Automatically release smoke relief hatches
ī¯ Control operation of HVAC supply and exhaust fans
īŽ Total shut down
īŽ Special smoke management systems
13. 13
Fire Alarm Systems (contâd)
ī¯ Types
īŽ Conventional (off/on âdumbâ devices)
īŽ Addressable
ī¯ Analog
ī¯ Digital
ī¯ Equipment
īŽ Manual Fire Alarm Boxes (Pull Stations)
īŽ Mounting â not less than 3.5 and not more than 4.5 ft above floor
level (ADA requires maximum 48â high forward reach)
īŽ Spacing:
ī¯ At exit doorways within 5â of each exit doorway on each floor; on both
sides of opening 40 feet and wider, and within 5 feet each side
ī¯ Additional boxes such that distance of travel to any box less than 200
feet on same floor
15. 15
Fire Alarm Systems (contâd)
ī¯ Heat Detectors
īŽ Applications
ī¯ Where smoke is ordinarily present
ī¯ Top of elevator shafts where sprinklers are present
īŽ Types
ī¯ Fixed
ī¯ Combination fixed/rate of rise
īŽ Location
ī¯ On ceiling not less than 4â from sidewall, or on sidewall between
4â and 12â of ceiling
17. 17
Fire Alarm Systems (Contâd)
īŽ Heat Detectors (contâd)
īŽ Typical Spacing
ī¯ Fixed: 15âx15â
ī¯ Combination fixed/rate of rise: 50âx50â
ī¯ All points on ceiling within 0.7 x listed spacing
īŽ Special considerations â beam construction,
sloped ceilings â refer to NFPA 72 for spacing
requirements.
19. 19
Stages of a Fire
ī¯ Incipient â invisible combustion gases,
without smoke or flame, no appreciable heat
release
ī¯ Smoldering â heat still absent, combustion
gases now visible as smoke
ī¯ Flame â actual fire is produced, a column of
gases made luminous by intense heat
ī¯ Heat â follows concurrently or just after flame
stage â tremendous amounts of heat released
20. 20
Smoke Detectors
ī¯ Types
īŽ Spot
īŽ Beam
ī¯ Design:
īŽ Ionization
īŽ Photoelectric
ī¯ Spot Detector Accessories
īŽ Integral alarm
īŽ Typical use â motels and similar sleeping spaces
21. 21
Photoelectric Spot Smoke Detector
with Integral Alarm
ī¯ Photoelectric detectors
operate using principle of
âsmoke obscurationâ
ī¯ Smoke interposed in light
beam between small
emitter and detector
ī¯ Decreased light intensity at
detector causes alarm to
sound
ī¯ Device in photo also
includes integral alarm â
used in motels and similar
sleeping spaces.
23. 23
Smoke Detectors (contâd)
īŽ Applications
ī¯ Spot detectors
īŽ For general fire detection
īŽ Close doors, operate smoke dampers
ī¯ Beam detectors
īŽ High ceilings where spot detectors impractical
īŽ Location
ī¯ On ceiling not less than 4â from sidewall, or on sidewall between
4â and 12â of ceiling
27. 27
Incorrect Application of Smoke
Detector
ī¯ Area covered = 60â x
15â = 900 s.f.
ī¯ Distance to corner
exceeds 0.7 x listed
spacing (0.7 x 30 =
21â)
ī¯ Two smoke detectors
would be required for
this room.
28. 28
Beam Smoke Detector
ī¯ Smoke rising to ceiling will
obscure light beam.
ī¯ Receiver will detect change
in beam intensity and cause
alarm to sound.
ī¯ Often used in atrium
spaces, high âcathedral
ceilingsâ, similar spaces.
29. 29
Notification Appliances
ī¯ Audible
īŽ Refer to NFPA 72 for sound pressure levels
īŽ Mounting
ī¯ Wall â top not less than 90â a.f.f., not less than 6â
below ceiling (where ceiling heights allow)
ī¯ If combined with visual appliances, entire lens of
visual appliance not less than 80â nor greater than 96â
a.f.f.
īŽ Spacing
ī¯ Such that they can be heard throughout building
ī¯ Refer to NFPA 72 for specific requirements
32. 32
Notification Appliances (contâd)
ī¯ Visual Appliances
īŽ Location
ī¯ Wall mounted â entire lens 80â -96â a.f.f.
ī¯ Ceiling mounted permitted when device is specifically listed for
this application.
īŽ Spacing
ī¯ Refer to NFPA 72
ī¯ When two or more in same field of view, must be synchronized
(can be harmful to persons with epilepsy)
33. 33
Remote Annunciator Panel at School
80
ī¯ An annunciator panel
displays at remote entries
and other locations the
zone or device that is in
alarm â generally located at
main entries.
35. 35
Types of Fire Suppression Systems
ī¯ Standpipe and Hose Systems
A reliable water supply, piping, hose connections to
permit manual extinguishing of a fire.
ī¯ Sprinkler Systems
A reliable water supply, piping, sprinklers, to permit
automatic extinguishing of a fire.
ī¯ Chemical Extinguishing Systems
Both manual and automatic systems
Use a chemical extinguishing agent where water is not
effective, or cannot be used.
36. 36
Standpipe and Hose Systems
Classification:
Class I â 2-1/2â hose connections for firefighterâs
use, 100 psi at uppermost hose connection.
Class II â 1-1/2â hose connections for occupant use,
100 psi at uppermost hose connection.
Class III â 2-1/2â and 1-1/2â hose connections for
both firefighterâs and occupant use.
39. 39
Typical Backflow Preventer for Fire
Protection Service
ī¯ A backflow preventer
prevents water
contained in building
piping systems from
flowing back into the
community water main.
ī¯ Water piping in
buildings may contain
foul and/or hazardous
materials.
40. 40
Classification (contâd)
ī¯ Type I and III standpipes are the most
common.
ī¯ Design Standard
âĸ NFPA 14 Standard for the Installation of
Standpipe, Private Hydrant, and Hose Systems.
âĸ Current edition is 2003
âĸ As of 2004, NYS Building Code adopts the 2000
edition.
41. 41
Combined Systems
īą A combined system is a standpipe that also supplies
automatic sprinklers on each floor.
īą Combined systems were first permitted by NFPA in
1976 to encourage owners of high rise buildings that
already had standpipes to install sprinkler systems.
īą A sprinkler crossmain is connected to the standpipe
at each floor. A typical connection detail is
contained in NFPA 14 Figure A-5-9.1.3.1 (a) and (b).
42. 42
Diagram of a Typical Combined
Sprinkler and Standpipe System
44. 44
Buildings that Require Standpipe
and Hose Systems
ī¯ Buildings where standpipes and hose systems are
required:
ī¯ Any building where the highest floor level is 30 ft. or more
above the lowest level of fire department vehicle access.
ī¯ Places of Assembly
ī¯ Covered Mall Buildings (e.g. Shopping Malls)
ī¯ Stages
ī¯ Underground Buildings
ī¯ Check the applicable building ordinance for specifics
(NYS 905.3)
45. 45
Water Supplies
ī¯ Water supply must be among the following:
âĸ Public waterworks with adequate pressure
âĸ Automatic fire pump connected to public
waterworks
âĸ Manually controlled fire pump in combination
with pressure tanks.
âĸ Pressure tanks installed in accordance with NFPA
22
46. 46
Water Supplies (contâd.)
âĸ Manually controlled fire pumps operated by
remote control devices at each hose station.
âĸ Gravity tanks in accordance with NFPA 22
âĸ Automatic fire pumps connected to the public
waterworks are the most common.
47. 47
Water Supply Capacity
ī¯ Water supply capacity
âĸ The capacity of the supply is calculated as
follows:
ī¯ 500 gpm for the first standpipe
ī¯ 250 gpm for each additional standpipe
ī¯ Not to exceed 1250 gpm
ī¯ Water supply must have minimum 30 minutes
duration for calculated flow
48. 48
Additional Classification of Standpipes
ī¯ Wet
âĸ The standpipe system is always filled with water.
ī¯ Dry
âĸ The standpipe system contains no water.
âĸ Generally used only in unheated buildings (e.g., parking
garages.)
ī¯ Automatic
âĸ Water supply capable of supplying system demand
automatically.
âĸ Most common type
49. 49
Additional Classification of Standpipes
(Contâd)
ī¯ Manual
âĸ Connected to small water supply to maintain water in the
system, but inadequate to meet demand.
âĸ Relies on fire department pumper to supply necessary
system demand.
ī¯ Other types: semi-automatic dry, manual-dry (see
NFPA 14 for explanations.)
ī¯ The Building Ordinance (NYS Building Code)
prescribes which type is required.
50. 50
Fire Pumps
ī¯ Fire Pumps
âĸ Since most water main pressures are generally
less than 100 psi at the street, a fire pump is
usually required to provide adequate pressure.
âĸ Fire pumps must be provided with an emergency
power source.
âĸ Fire pumps generally require a separate, fire rated
(2 hr.) room or enclosure.
52. 52
Location of Hose Connections
ī¯ Location of Hose Connections
âĸ Height: not less than 3 ft and not more than 5 ft above
floor (usually 4 ft).
ī¯ Class I Systems
âĸ In exit stairways at each intermediate landing between
floor levels.
âĸ Each side of wall adjacent to exit openings of horizontal
exits.
âĸ Each exit passageway at entrance from building areas into
passageway.
53. 53
Location of Hose Connections (Contâd)
ī¯ In covered mall buildings at entrance to each exit
passageway or exit corridor, and exterior public
entrances to mall.
ī¯ At highest landing of stairways with access to roof,
and on roof where stairways do not access the roof.
ī¯ Additional 2-1/2â hose connection at hydraulically
most remote riser to facilitate testing.
ī¯ See NFPA 14 for more requirements.
54. 54
Location of Hose Connections
(Contâd)
ī¯ Class II Systems
âĸ 1-1/2â hose stations so that all portions of each
floor level are within 130 ft of a hose connection.
ī¯ Class III Systems
âĸ As required for both Class I and Class I Systems
55. 55
Drainage of Standpipes
ī¯ Each standpipe to be equipped with a means
for draining
ī¯ Usually a drain valve is located at lowest
point of standpipe, downstream of isolation
valve
ī¯ Drain to an approved location
âĸ Often drained to spill at grade
56. 56
Fire Department Connections
ī¯ At least one fire department connection for
each zone of each Class I and Class III system
ī¯ High rise buildings require two remotely
located fire department connections for each
zone
ī¯ Height: +18â to +48â above adjoining grade
57. 57
Fire Department Connections (Contâd)
ī¯ A check valve is required downstream.
ī¯ No shutoff valve is permitted between the fire
department connection and the system.
ī¯ Dry piping between connection and check
valve should be galvanized steel.
ī¯ Signage is required at each connection. See
NFPA 14, Ch. 4-3.5.2 for details.
58. 58
Sprinkler Systems
ī¯ Definition and purpose â a reliable water supply, piping,
sprinklers, valves and accessories for the purpose of
automatically extinguishing a fire.
ī¯ Governing Design Standards
īŽ Local building code or ordinance â prescribes where sprinkler
systems are required
īŽ NFPA 13 Standard for the Installation of Sprinkler Systems â
prescribes how sprinkler systems are to be designed and constructed
īŽ Factory Mutual (FM) â An insurance company standards
organization; it may, through the building ownerâs insurance
company, impose additional restrictions/requirements for overall
building fire protection systems.
60. 60
Sprinkler Systems (contâd)
ī¯ Wet system
īŽ Piping is filled with water under pressure at all
times.
īŽ When one or more sprinkler heads open, water is
automatically discharged.
īŽ Used in heated buildings or portions of buildings
that are heated.
īŽ Most common type of system.
61. 61
Diagram of a Wet Pipe Sprinkler
System with Water Motor Alarm
ī¯ Both pendant and
upright sprinklers may
be used.
ī¯ During operation, the
alarm check valve
diverts a small portion
of water to the water
motor alarm â does not
rely on electricity to
sound alarm.
64. 64
Wet Pipe Sprinkler with Electric Alarm
ī¯ An electric alarm bell is
operated through a water
flow switch inserted into
the main riser.
ī¯ When a sprinkler opens,
water flow activates flow
switch, and alarm sounds.
ī¯ Requires a reliable source
of power from an
emergency source.
65. 65
Sprinkler systems (contâd)
ī¯ Dry system
īŽ Piping is filled with compressed air.
īŽ A dry system valve blocks the entry of water into the
piping. Air pressure in the piping holds the valve closed.
īŽ When one or more sprinkler heads open
ī¯ Air is first released through the head(s)
ī¯ Air pressure in the piping system drops.
ī¯ Dry system valve swings open.
ī¯ Water floods the piping system.
īŽ Used in unheated buildings, or portions of buildings that
are not heated, e.g., attics.
66. 66
Diagram of a Dry Pipe Sprinkler
System
ī¯ Upright heads must be
used, in order to allow
the piping to drain
completely.
67. 67
Sprinkler systems (contâd)
ī¯ Pre-action system
ī¯ Requires operation of both a fire detector and
a sprinkler head opening before water is
released.
īŽ Piping is filled with pressurized air.
īŽ A fire detection system (smoke, heat detectors, manual
pull station) is wired to the pre-action valve; valve is
opened only when fire detection system is activated.
īŽ Water floods piping.
68. 68
Pre-action system (contâd)
īŽ Water is released from each sprinkler head that
opens.
īŽ Used for rooms that contain valuable equipment
or materials that could be damaged be release of
water, where fire detection must be verified
independently.
ī¯ Main frame computer rooms
ī¯ Laboratories
70. 70
Sprinkler Systems (contâd)
ī¯ Deluge System
īŽ All sprinklers are open
īŽ When water fills the piping system, all sprinklers
discharge water simultaneously
īŽ Diagram is similar to pre-action system
īŽ Applications:
ī¯ Where severe fire hazard exists that can be
extinguished safely with water
īŽ E.g. â a Fireworks Factory
71. 71
Sprinkler systems (contâd)
ī¯ Where required:
īŽ Governed by the local building code or ordinance
īŽ If not required by code, insurance companies
often offer reduced rates, or wonât insure
buildings without sprinkler systems.
72. 72
Some Sprinkler Types
ī¯ Recessed Pendant
Sprinkler
ī¯ Glass tube holds metal disc
seated in valve seat
ī¯ Glycerin in glass tube
expands when heated and
will shatter glass
ī¯ Water is released
ī¯ Spray pattern is established
by deflector
75. 75
Sprinkler with Wire Guard and
Deflector Disk (Pendant Style Shown)
ī¯ This sprinkler would be
used to protect combustible
materials in storage racks
ī¯ Wire guard protects
sprinkler from damage as
racks are loaded/unloaded
ī¯ Deflector plate prevents
water may be discharged
from above from cooling
this sprinkler and
preventing its operation
76. 76
Concealed Sprinkler
ī¯ Decorative white disk is
soldered to the sprinkler
body â solder melts first,
plate falls to floor,
exposing sprinkler
ī¯ Exposed sprinkler will now
operate like a standard
sprinkler - releases water as
temperature increases
ī¯ Can be used in Light
Hazard Occupancies
79. 79
Sprinkler systems (contâd)
ī¯ Requirements for water supply capacity and
spacing of sprinklers depend upon the
buildingâs occupancy classification
ī¯ Occupancy Classes:
īŽ Light
īŽ Ordinary Group 1
īŽ Ordinary Group 2
īŽ Extra Group 1
īŽ Extra Group 2
80. 80
Light Hazard
ī¯ Quantity and/or combustibility of contents is
low; fires with relatively low rates of heat
release are expected.
ī¯ Examples:
īŽ Churches
īŽ Libraries
īŽ Restaurant seating areas
81. 81
Ordinary Hazard
ī¯ Group 1 â combustibility is low, quantity of
combustibles is moderate, stockpiles of
combustibles do not exceed 8 ft, fires with
moderate rates of heat release expected.
ī¯ Examples:
īŽ Automobile parking and showrooms
īŽ Bakeries
īŽ Restaurant service areas
82. 82
Ordinary Hazard (contâd)
ī¯ Group 2 â quantity and combustibility of
contents moderate to high, stockpiles do not
exceed 12 ft, fires with moderate to high rates
of heat release expected.
ī¯ Examples:
īŽ Chemical plants - ordinary
īŽ Dry Cleaners
īŽ Library large stack room areas
83. 83
Extra Hazard
ī¯ Group 1 â combustibility is low, quantity of
combustibles is very high, dust, lint or other
materials are present, possibility of rapidly
developing fires with high rates of heat release, but
little or now combustible or flammable liquids.
ī¯ Examples:
īŽ Aircraft hangers
īŽ Plywood and particle board manufacturing
īŽ Printing
84. 84
Extra Hazard (contâd)
ī¯ Group 2 â moderate to substantial amounts of
flammable or combustible liquids
ī¯ Examples:
īŽ Flammable liquids spraying
īŽ Plastics processing
īŽ Varnish and paint dipping
ī¯ In all cases, refer to NFPA 13 and AHJ (Authority
Having Jurisdiction) for quidance in assessing
occupancy classification
85. 85
Sprinkler systems (contâd)
ī¯ Maximum Area of Coverage (Standard Spray
Upright and Pendant Sprinklers)
īŽ Light hazard: 225 s.f., maximum 15â between sprinklers
īŽ Ordinary hazard: 130 s.f., maximum 15â between
sprinklers
īŽ Extra hazard: 90 s.f., maximum 12â between sprinklers
(see NFPA 13 for exceptions)
ī¯ Protection Area per sprinklers:
īŽ S x L, where S = spacing between sprinklers or twice
distance to end wall, whichever is greater.
īŽ L = spacing between branch lines or twice the distance to
end wall, whichever is greater.
86. 86
Sprinkler systems (contâd)
ī¯ Maximum distance from walls: less than ÂŊ spacing.
ī¯ Minimum distance to walls: 4â
ī¯ Where walls are angled or irregular, the maximum
distance to any point on floor â 0.75 spacing, with
maximum perpendicular distance to wall not
exceeded.
ī¯ Minimum distance between sprinklers: 6â (see
exceptions NFPA 13)
87. 87
Sprinkler Location
ī¯ Deflector position
īŽ Standard spray pendant or upright heads:
minimum 1â to maximum 12â from ceiling.
īŽ Standard spray sidewall sprinklers: minimum 4â
to maximum 6â from ceiling. (In special
situations, 6 to 12â â see NFPA 13)
īŽ Critical point â the farther the sprinkler is from
the ceiling, the longer it will take for the heat to
collect at the ceiling plane and set off the
sprinkler.
89. 89
Sprinkler Spacing Examples
ī¯ Light Hazard Occupancy
ī¯ 225 s.f. per sprinkler
ī¯ Maximum 15â between
branch lines and between
sprinklers on branch lines
ī¯ Maximum 15/2 = 7.5 from
wall to outermost sprinkler
and branch lines
ī¯ Here, S=L=15â
90. 90
Sprinkler Spacing Example No. 2
ī¯ Occupancy Hazard:
Ordinary Group 1
ī¯ Maximum coverage
per sprinkler: 130 s.f.
ī¯ Maximum spacing: 15â
91. 91
Example No. 2 â Proposed Solution
ī¯ Area of coverage is 10âx
13â = 130 s.f.
ī¯ Maximum spacing is 13â,
which is less than the
maximum 15â allowed
ī¯ Maximum distance to wall
is 6.5â, which is ÂŊ the
largest spacing (13â)
ī¯ Yet this solution does not
comply with NFPA 13!
92. 92
Example No. 2 (contâd)
ī¯ Area of coverage of
sprinkler in NW corner
is: (6+5) x 13 = 141 s.f.
ī¯ The number of
sprinklers required is
actually (41â x 39â)/130
s.f. per sprinkler =
12.3; the proposed
solution has just 12
93. 93
Example No. 2 (contâd)
ī¯ Here is one correct
solution.
ī¯ More sprinklers are
required in order to
comply with both
spacing and area of
coverage requirements.
ī¯ S=12â (2 x 6); L=9â-8â
ī¯ A=12â x 9â-8â = 116.04
s.f
94. 94
Example No. 2 (contâd)
ī¯ If a 2âx2â suspended
tile ceiling is used, the
sprinklers will not be
centered within the
tiles.
95. 95
Example No. 2 (conclusion)
ī¯ Since we have more
sprinklers than are needed,
we can shift the centerlines
slightly to achieve center of
tile placement of
sprinklers.
ī¯ In this example, the dashed
area represents greatest
coverage, = (5â-6â +5â-0â)
x (5â-0â + 6â-0â) = 126.5
s.f.
96. 96
Sprinkler Systems (contâd)
ī¯ Sprinkler Classifications
īŽ Design and performance
ī¯ Area of coverage
ī¯ Speed of response
īŽ Standard response
īŽ Fast response
īŽ Orientation
ī¯ Concealed
ī¯ Flush
ī¯ Pendent
ī¯ Recessed
ī¯ Sidewall
ī¯ Upright