1 CXS490 - Pre-Engineered Fire Protection Systems Off-Road Vehicle Systems

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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