Unit 3 Fire Suppression
Section 1 Detection and Alarm Systems
1. Importance of Fire Detection
and Alarm Systems
1.1. Time Element
1.2. Notification
a. Type A Manual Alarm
b. Type B Automatic Alarm
1.3. Activation
Note: Studies with children and notification!
2. Types of Detectors
2.1. There are three broad classifications
of fire detection:
Heat, Smoke & Flame Detectors.
2.2. Fire Detectors are used in a variety
of fire prevention and suppression
systems.
3. Classification of Heat Detectors
3.1. Heat Detectors respond to the excess heat
generated in a fire
3.2. Two subclassifications based on operation
3.2.1. Fixed Temperature which
operate at predetermined
temperature
3.2.2. Rate of Rise operate based on a
specified rate of temperature rise
(degrees/min.)
4. Smoke Detectors
4.1. Smoke detectors respond to the
presence of smoke
4.2. General Information
4.3. Classifications of Smoke
Detectors
4.3. Two Classifications
4.3.1. Photoelectric smoke detectors
4.3.2. Ionization smoke detectors
4.3. Classifications of Smoke
Detectors
4.3.1. Photoelectric smoke detectors
4.3. Classifications of Smoke
Detectors
4.3.2. Ionization smoke detectors
PROPER LOCATION OF
SMOKE DETECTORS
On Each Level
of House
Bedroom
No. 1
Bedroom
No. 2
Dining
Living
Room
Room
Basement
VS 19-2
Outside Sleeping
Areas
Dining
Kitchen
BR
BR
Bath
Living Room Entry
Master Bedroom
VS 19-3
PROPER MOUNTING OF SMOKE
DETECTORS
Best in
Center of
Ceiling
Dead Air
Space
Horizontal
Distance
from Peak
No Closer
than
4 inches
(102 mm)
From
Side Wall
Mount on Wall
at least
4 inches
(102 mm)
from ceiling
No more than
12 inches
(305 mm)
from ceiling
Best Location
Acceptable Location
3 Feet
(1m)
5. Flame Detectors
5.1. Flame detectors respond to the
presence of a flame
5.2. General Information
5.3. Principle of Operation
6.0 Placement of Fire Detectors
6.1. In general, fire detectors are
normally placed on the ceiling or
within 12" of ceiling
6.2. Where possible the detectors
should be located throughout
entire building
6.0 Placement of Fire Detectors
Cont’d
6.3. Spacing of detectors will vary
based on several factors
6.4. Connection to Remote Locations
6.5. Testing & Maintenance of fire
detectors
7.0 Components to a Fire Alarm
System
7.1. Power supply
7.2. Detectors & manual pull boxes
7.3. Signal supervisors
7.0 Components to a Fire Alarm
System Cont’d
7.4. Local Alarms
7.5. Indicator Boards
7.6. Reference for
Alarm Systems
Unit 3 Fire Suppression
Section 2 “Fixed Extinguishment Systems”
1. Introduction to Sprinkler Systems
1.1. Effectiveness of Sprinkler Systems
1.2. Function of Sprinklers
1.3. Advantages of Sprinklers
1.4. Cost of Sprinklers
2. Types of sprinkler systems
2.1. There are four major classifications
of sprinkler systems
2. Types of sprinkler systems
2.2. Wet-pipe Systems
2.2.1. Operation of system
2. Types of sprinkler systems
2.3. Dry Pipe System
2.3.1. Operation of system
Dry Pipe System
Two question to ask:
• activation / trip pressure for valve
• is air pressure greater than activation/trip
pressure (should be 10 – 15 psi greater)
Air
Water
70 psi
Activation/Trip
pressure = 40 psi
Air pressure should be
50 – 55 psi
Activation/Trip
pressure set by
the manufacture
2. Types of sprinkler systems
2.4. Pre-action Systems
2.4.1. Operation of System
2.4.2. Advantages over drypipe system
2.4.3. Disadvantage--two
systems must both
function properly
2. Types of sprinkler systems
2.5. Deluge sprinkler system
2.5.1. Operation of system
2.5.2. Uses of Deluge System
3. Basic Sprinkler System Components
3.1. Water Supplies
3.1.1. Types of water supplies
 Public Water
 Pressure Tanks
Basic Sprinkler System Components
3.1.1. Types of water supplies
• Gravity feed from tank
Easier for
water to flow
down than up
3. Basic Sprinkler System Components
3.1.1. Types of water supplies
 Fire pumps
 Fire Department
Connections
3. Basic Sprinkler System Components
3.1.2. Amount of water supply
a. Hazard of Occupancy—most important
 Light hazard class
 Ordinary hazard class
Group 1
Group 2
 Extra hazard class
Group 1
Group 2
Basic Sprinkler System Components
a. Hazard of occupancy
Hazard Class
Combustibility
of Content
Amount of
Combustibles
Heat
Liberation
Heads Open
Light
Low
Low
Low
Few
Ordinary
Group 1
Low
Moderate
Moderate
Moderate
Ordinary
Group 2
Moderate
Moderate High
Moderate High
Moderate
Extra Hazard
Group 1
Very High
Very High
Very High
Many
Extra Hazard
Group 2
Very High
Very High
Very High
Many
3. Basic Sprinkler System Components
3.1.2. Amount of water supply
b. Obstructions to water delivery
c. High ceilings
d. Unprotected vertical openings
between floors
e. Division of spaces
3. Basic Sprinkler System Components
3.1.3. Calculating water supply
Q = k √P
Where:
Q = supply (GPM)
k = coefficient of orifice (inside pipe size)
P = pressure (PSI)
3. Basic Sprinkler System Components
3.2. Sprinkler Piping
3.2.1. The piping and type of valve
will vary depending on type of
system
3.2.2. Types of piping
3.2.3. Hydraulic design
of systems
SPRINKLER PIPING
riser
(alarms, water flow
valve, sprinkler valve)
tank
yard main
(or natural water supply
6” – 8”
always below freeze line
“open” or
“closed”
cross main
sprinkler head
branch lines
feed main
should be
“open”
post indicator valve
public water supply - 8” – 12”
pad lock
unlock to
close valve
3. Basic Sprinkler System Components
3.3. Sprinkler Valves
3.3.1. The purpose of a sprinkler
valve is to retain & control
flow of water and to isolate
individual risers.
VS 15-4
CONTROL VALVE LOCATION
Every system will have two
valves: a main water
control valve and a
sprinkler valve.
The main control valve
should always be in the
OPEN position.
Main Control
Valve
(OS&Y)
VS 15-5
TYPES OF CONTROL VALVES
OS&Y (Outside
Screw and
Yoke)
PIV (Post
Indicator Valve)
WPIV (Wall Post
Indicator Valve)
3. Basic Sprinkler System Components
3.4. Alarms on Sprinkler Systems
3.4.1. Every sprinkler system should
have an alarm that sounds
when water flows through the
system.
3.4.2. Types of Alarms
3.4.3. Supervisory signals
3. Basic Sprinkler System Components
3.5. Test Connections
3.5.1. Two Inch Drain Test
3.5.2. Inspectors Test Connection
3.6. Sprinkler Heads
3.6.1. Operating Principle
Deflector
Frame
Arms
Release
Mechanism
(Fusible Link)
Lever
Arms
Valve
Cap
3. Basic Sprinkler System Components
3.6. Sprinkler Heads
3.6.2. Type based on position
VS 15-3
SPRINKLER DESIGNS
Pendant
Upright
Sidewall
3. Basic Sprinkler System Components
3.6. Sprinkler Heads
3.6.3. Type based on activation
a.
b.
c.
Solder-link
Frangible bulb
Fusible pellet
VS 15-2
RELEASING MECHANISMS
Fusible
Link
(Standard)
Chemical
Pellet
Frangible
Bulb
Fusible Link
(Quick
Response)
3. Basic Sprinkler System Components
3.6. Sprinkler Heads
3.6.4. Deflectors
3.6.5. Flow rates
VS 15-3
SPRINKLER DESIGNS
Pendant
Upright
Sidewall
3. Basic Sprinkler System Components
3.6. Sprinkler Heads
3.6.6. Temperature rating of sprinkler
heads
Non-Colored  Ordinary  135-1700F
White
 Intermediate  175-2250F
Blue

High
 250-3000F
Red
 Extra High  325-3750F
Green
 Very High  400-4750F
Orange
 Ultra High  500-6500F
3. Basic Sprinkler System Components
3.6. Sprinkler Heads
3.6.7. Special service sprinkler
heads
4. Location and Spacing of Sprinklers
4.1. Fundamental rule
4.2. Reference on location and
spacing: NFPA code 13, Sprinkler
Standards
4. Location and spacing of sprinklers
4.3. Spacing depends on the class of
hazard of occupancy and the type of
ceiling construction
4.3.1. Light hazard - 15' maximum
between sprinklers
4.3.2. Ordinary hazard - 12-15' ft.
depending on use of area
4.3.3. Extra hazard - 12' maximum
4. Location and spacing of sprinklers
4.4. Sprinklers must also be spaced so that each
sprinkler does not protect more than a specified
area:
4.4.1. Light hazard occupancy—floor area/sprinkler maximum
of 130-200 square feet, depending on type of ceiling
4.4.2. Ordinary hazard occupancy--max. area per sprinkler
100-130 square feet, depending on use of space
4.4.3. Extra hazard occupancy--90 square
feet sprinkler maximum
Extra High
Hazard
90 ft2
4. Location and spacing of sprinklers
4.5. Determine protection area for sprinkler
heads using the following formula:
As = S X L
Where “S” is the distance between heads on
the lines and “L” is the distance between branch
lines.
4. Location and spacing of sprinklers
4.5. Protection area of sprinklers along “walls”
As = S X L
S is the larger of either twice the distance to the wall or the distance to the
next sprinkler head
L is the larger of either twice the distance to the wall or the distance to the
next branch line.
4 ft
10 ft
3 ft
9 ft
AS = S x L
S = 3 x 2 = 6 or 10
L = 4 x 2 = 8 or 9
AS = S x L
AS = 90 ft
4. Location and spacing of sprinklers
4.6. Other location specifications that
may influence spacing
5. Carbon Dioxide Extinguishing Systems
5.1. Application
5.2. Advantages
5.3. Disadvantage
5. Carbon Dioxide Extinguishing Systems
5.4. Storage of CO2
5.5. Delivery Mechanism
5. Carbon Dioxide Extinguishing Systems
5.6. Types of fixed systems
5.6.1. Total flooding
5.6.2. Local application
5.7. Inspection of Systems
6. Dry Chemical Fire Extinguishing Systems
6.1. Application
6.2. Operation of system
Carbon Dioxide Extinguishing Systems
6.3. Types of fixed systems
– Total flooding
• apply to an entire room or confined area
– Local application
• applying CO2 over the surface of the tank
local application
Acid Pickling Tank
6. Dry Chemical Fire Extinguishing Systems
6.4. Quantity and rate of application is
determined by a qualified professional
6.5. Inspection and maintenance must be
completed at least once each year
(NFPA Code #17)
7. Foam Fire Extinguishing System
7.1. Application
7.2. Inspection and maintenance
7.3. Fire code for foam systems is NFPA #11
and NFPA #16 for foam-H2 combination
systems
Foam Fire Extinguishing System
7.4. Types of systems
– fixed
• activate with detector head
• high hazard areas
– portable
• fire departments
air
liquid
7.5 Video on Foam
mechanical
agitation
Unit 3 Fire Extinguishment
Section 3 “Explosion Prevention”
1. Introduction
1.1. Principles of Explosion Prevention
a) Venting to relieve the pressure
b) Suppression to extinguish or retard the
deflagration
c) Purging to eliminate the combustible
mixture
2. Fundamentals of explosion venting
2.1. Location of hazardous operations
2.2. Design of the vent
2.2.1. Location of vent is important
2.2.2. Size of vent
2.2.3. Design variables for vents
2. Fundamentals of explosion venting
2.3. Design of vent closures
2.3.1. Most effective vent for release of
explosion pressure is an unobstructed
vent opening
2.3.2. Several small vents may be as
effective as one large opening as long
as total area is the same
2. Fundamentals of explosion venting
2.3. Design of vent closures
2.3.3. The nearer a vent is located to the
point of explosion the more effective it
will be
2.3.4. If diaphragms (of the same size and
thickness) are made thicker then more
pressure will be required to rupture
them
2. Fundamentals of explosion venting
2.4. Maintenance of vents
3. Explosion Suppression
3.1. Elements in the system
3.1.1. Pressure Detector
3.1.2. Suppressors
3.1.3. Suppressant Material