High Pressure CO₂ Fire Extinguishing System

1. Introduction

1.1 Features of the High Pressure CO₂ Fire Extinguishing System

CO₂ is a kind of incombustible inert gas which never supports burning. It can be liquidized, charged into bottles and transported easily, and is one of the most widely used fire extinguishing agent. CO₂ is colorless and smell-less when it is ejected at atmospheric temperature and pressure. It has the properties of rapid extinguishing and good space submergence and will not dirt the preserved objects.

As a fire extinguishing agent, CO₂ can asphyxiate and cool the fire. The key effect on fire is asphyxiation.

Compared with the halon fire extinguishing system, the CO₂ Fire Extinguishing System can be manufactured at a lower cost and will not pollute the environment. Because of the lower cost of CO₂, it will replace halon as fire extinguishing agent in many cases.

Besides, our ZMT series of High Pressure CO₂ Fire Extinguishing System has the following properties in its structure.

(1) Metal-membrane sealer of the container ensures an excellent air-tight seal and makes permanent storage possible.

(2) Multi-start mode (e.g., electric start, pneumatic start, electric-manual start and jury mechanical-manual start) makes absolutely reliable start assured.

(3) Special electric start device decreases the start current to a lower level, which has resulted in a great reduction in power for the control unit and in volume of the battery and has made the system more compact.

(4) Particular design of the bottle’s straight-through valve reduces the flow resistance of CO₂ extinguishing agent to the minimum.

1.2 Application Scope

(1) CO₂ fire extinguishing agent can be used for extinguishing ordinary solid fire (i.e., A type fire), gas fire (i.e., C type fire) and three kinds of liquid fire (B type fire).

(2) CO₂ fire extinguishing agent does not conduct electricity, so it can be used for electric equipment and electric circuits.

(3) CO₂ fire extinguishing agent will neither pollute the environment at fire site or corrode equipment, nor leave any vestige when it is used for fire extinguishing . So it can be used for the places with valuable articles or precious documentation.

1.3 Exceptional Cases

The fire extinguisher should not be used for the follows:

(1)The fire of chemical products that can supply oxygen by themselves, such as cellulose nitrate, gunpowder, etc.

(2) The fire of active metal and their hydride.

(3) The fire of self-decomposable chemicals.

(4) The fire hidden within fibers.

2. Technical Parameters of the System

2.1 CO₂ Charging Pressure (Storage Pressure), Charging Rate, Maximum Working Pressure and Other Related Parameters

Charging rate: 0.67 kg/L;
Charging pressure (storage pressure): 5.17 Mpa (210 ^oC);
Maximum working pressure: 15 Mpa (510 ^oC);
Ambient temperature: --20 ~ +500 ^oC;
Relative humidity: 80~95%

2.2 Bottle Capacities of CO₂ Extinguishing Agent and Starting Gas, and the Related Parameters

Capacity of CO₂ extinguishing agent bottle: 40 L, 70 L, 80 L;
Capacity of starting gas bottle: 3 L, 20 L;
Starting gas: N₂, CO₂;
Working pressure of starting bottle: 10 MPa.

2.3 Starting Mode

(1) Electric Start: DC 12 V ~ 28.8 V (60);
(2) Pneumatic Start: gas pressure >= 0.35 MPa;
(3) Jury mechanical-manual start: mechanical force <= 50 N.

2.4 Power Supply

Main power: AC 220 V 50 Hz;
Reserve power: DC 24 V.

2.5 Ejecting Time of Extinguisher

Ejecting time of full-submerging fire extinguisher:
for surface fire: <= 60 s
for deep fire: <= 420 s

2.6 Mounting Height of the Collective Pipes and Select Valve

Mounting height of collective pipes: <= 2400 mm;
Mounting height of select valve: ~ 1500 mm.

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