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CXS490 - Pre-Engineered Fire Protection Systems
Off-Road Vehicle Systems
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• systems can be either manually operated
or automatically operated.
• uses multi-purpose dry chemical
(monoammonium phosphate base)
for Class A, B and C fires.
• not designed to extinguish all possible fires
occurring on off-road vehicles.
Overview
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Cylinders with Separate Expellant Tanks
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Another Configuration
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• pre-engineered
• cartridge-operated dry chemical system with
• a fixed nozzle distribution network.
• approved by Factory Mutual Research Corporation
• capable of automatic detection & actuation and/or
• remote manual actuation.
Description
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When a fire is detected,
• system is actuated either manually or automatically,
• operating the pneumatic actuator
• pneumatic actuator ruptures a seal disc in expellant gas cartridge
• This pressurizes & fluidizes dry chemical extinguishing agent
the tank,
• ruptures the burst disc when the required pressure is reached
• propels the dry chemical through the network of distribution hose
• dry chemical discharged through fixed nozzles and
• into the protected areas
• suppressing the fire.
Operation
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Automatic detection incorporates
• electric detection
• either linear detection wire or
• spot detection.
Detection
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Mobile equipment and industrial hazards
• total flooding or
• local application
Application
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Consists of:
• Dry Chemical Agent Storage Tank(s),
• Expellant Gas Cartridge,
• Distribution Piping (Hose) and
• Nozzles,
• ManualI/Automatic Actuator,
• Automatic Detection System,and
• Accessories.
Basic System
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Consists of
• a welded steel tank,
• gas tube
• brass fill cap,
• agent outlet bursting disc and union,
• instruction nameplate.
Agent Storage Tank
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Tanks for temperature ranges of +32 F to +120 F
(0 C to +49 C)
LT-A-101-10, has cartridge receiver and
an expellant gas cartridge located on side of tank.
Agent Storage Tank
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• Low profile & extreme temperature tanks
-65 F to +210 F (-54 C to +99 C)
• have a separate remote cartridge
• connected to the tank by
• high pressure 114 in. (2.9 m) hose.
• Tanks painted with a red enamel paint
• Available in five sizes
10 Ib.(4.5 kg); 20 Ib.(9 kg); 30 Ib. (13.5 kg)
125 Ib. (57 kg) & 250 Ib.(114 kg)
Agent Storage Tank
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Consists of:
• a rugged, welded steel back plate and
• clamp arm assembly
• designed to retain & protect agent storage tank
in hostile environment that they are installed in.
• painted red enamel and
• can be mounted by bolting or welding.
Mounting Bracket - Smaller Tanks
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• is fabricated of 1/2 in. steel
• conforms to the outline of the
tank assembly bottom
• can be welded to the mounting surface and
• tank can then be bolted to ring
using the pre-threaded holes in ring.
Mounting Ring - Larger Tanks
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• spun high pressure cartridge containing
• carbon dioxide for temperature ranges of
+32°F to +120°F (0°C to +49°C)
• nitrogen for extreme temperature ranges of
-65°F to +210°F (-54°C to +99°C).
Expellant Gas Cartridge
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• distribution piping (hose) network is
• designed to properly distribute the dry
chemical to the nozzles
• hose (to survive the vibration on mobile
equipment) is used to distribute the dry chemical
• Pre-engineered systems have predetermined
• hose sizes
• maximum and minimum hose lengths, and
• number of nozzles.
Distribution Piping
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• three types of nozzles available
• each type of nozzle designed and tested for
various applications and area of coverage
• Nozzle blow-off caps are available
• keeps nozzles free of dirt and grease.
Nozzles
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Manual/Automatic Actuator(s)
• manual actuator consists of an actuator body,
• a nitrogen cartridge, and
• a mounting bracket
Actuators
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Two types of manual actuators are available:• Remote & Dashboard
• When manual actuator is operated by hand
• gas supplied from nitrogen cartridge released
into 114 in. (2.9 m) actuation hose
• nitrogen pressure operates pneumatic actuator
punctures a larger expellant gas cartridge
(carbon dioxide or nitrogen)
• fluidizes and propels dry chemical from tank.
Actuators
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Automatic actuators operate the same way
except they can be operated automatically
by the detection system.
Actuators
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Three types of detector options can be used:
• a temperature-sensitive linear wire,
• a spot type heat detector, or
• a gas filled stainless steel tubing.
Detection System Types
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Temperature-sensitive linear wire
When fire breaks out
• wire insulation melts,
• completing an electrical circuit and
• causes detection system to actuate
fire suppression system.
Linear Wire
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Internal contacts
• close when the temperature of surrounding air
• reaches set point temperature of detector
• this completes an electrical circuit and
• causes the detection system to actuate
the fire suppression system.
Spot Type Heat Detectors
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Gas filled stainless steel tubing
When the gas in the tubing heats up
• the increase in pressure operates a responder
• completing an electrical circuit and
• causes the detection system to actuate fire
suppression system.
Gas Filled Tubing
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Detection & Control System
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• dry chemical pre-engineered,
• incorporating automatic detection
• with engine shutdown capabilities.
• Approved by Factory Mutual Research Corporation
based on actual fire tests by manufacturer
Specifications
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• Installation shall be in accordance with
• approved Design, Installation, Maintenance Manual
• conforms to NFPA Standard:
•17 - Dry Chemical Extinguishing System &
•121 - Mobile Surface Mining Equipment
Specifications