APPLICATIONS INCLUDE:

Carbon dioxide extinguishing agent used in engineered systems is particularly useful for hazards where an electrical, nonconductive medium is essential or desirable; where clean-up of other agents presents a problem; or where the hazard obstructions require the use of a gaseous agent.

The original "clean" agent, carbon dioxide suppresses fire without leaving behind an agent to damage sensitive equipment. And because there is no agent to clean up, you’re back in business faster. To provide the most economical system arrangement without sacrificing performance, we offer both Total Flooding and Local Application, high pressure systems (excluding distribution pipework and fittings).



Decription

Carbon dioxide is a plentiful, non-corrosive gas that does not support combustion nor react with most substances. It has a low toxicity classification by Underwriters Laboratories (Group 5a). It is commonly compressed to the liquid state for storage and transportation in ISO 9809-1 cylinders. Upon release, it discharges under its own pressure giving the appearance of steam as its low temperature crystalizes water in the air. For fire suppression purposes the discharge is designed to raise the carbon dioxide concentration in the hazard. This removes the free oxygen which supports combustion*, and results in fire extinguishment. The resultant lack of free oxygen dictates that total flooding hazards be evacuated immediately, and carbon dioxide from local application be avoided by personnel.

Performance

Carbon dioxide is an effective fire extinguishing agent that can be used on many types of fires. It is effective for surface fires, such as flammable liquids and most solid combustible materials. It expands at a ratio of 450 to 1 by volume. Other desirable attributes are its high degree of effectiveness, its excellent thermal stability, and freedom from deterioration. In addition, carbon dioxide has so many additional commercial uses that refills are available in practically every large city or seaport throughout the world. Criteria for quantity and concentration of carbon dioxide are developed in SANS 306:4 for both local application and total flooding application.

Ordering Information

Carbon dioxide cylinders for use in engineered systems may be ordered in 45kg cylinder sizes.

Approvals

  • The 45kg CO2 cylinders are manufactured to ISO 9809-1 and have TUV approval certificates.
  • The manifolds are pressure tested to 190Bar in accordance
    with SANS 306:4 by our SANAS approved test station
  • All valves, actuators and other ancillary equipment have VDS approval.

Typical hazards protected by carbon dioxide systems

  • Printing presses
  • Vaults
  • Open pits
  • Dip tanks
  • Spray booths
  • Ovens
  • Engine rooms
  • Coating machines
  • Process equipment
  • Hoods and ducts
  • Flammable gas or liquid storage areas

Properties Of Carbon Dioxide

The following are the properties of the agent:

  • Chemical formula CO2
  • Molecular weight 44.011
  • Normal sublimation temperature at
    atmospheric pressure, (°F) –109.21
  • Triple point temperature (at 75.35 psia) (°F) –69.88
  • Critical temperature, (°F) 87.87
  • Critical pressure, (psia) 1069.96
  • Critical density, (lb. per cu. ft.) 29.21
  • Density of liquid at 86 °F, (lb. per cu. ft.) 37.3
  • Specific volume of saturated vapour
    at 5 °F (cu. ft. per lb.) 0.266
  • Specific heat of liquid at 86°F, (btu per lb. °F) 2.5
  • Specific heat ratio (cp/cv) of vapour
    at 86 °F and one atmosphere pressure 1.3

Physical properties of CO2

Carbon dioxide is a colorless & odorless gas. It is soluble in water, ethanol , acetone and has the following properties:

  • Melting Point : -55.6 degC
  • Boiling Point : -78.5 degC
  • Density : 1.977

Chemical properties of CO2:

  • Carbon dioxide is a linear covalent molecule.
  • Carbon dioxide is an acidic oxide and reacts with water to give carbonic acid.
  • CO2 + H2O ==> H2CO3
  • Carbon dioxide reacts with alkalis to give carbonates and bicarbonates.
  • CO2 + NaOH ==> NaHCO3 (Sodium BiCarbonate)
  • NaHCO3 + NaOH ==> Na2CO3 (Sodium Carbonate) + H2O

Thermal conductivity, (btu ft. per sq. ft. hr. °F):

  • Saturated liquid, at 5 °F 0.067
  • Saturated liquid, at 86 °F 0.041
  • Vapour, at saturation pressure at 5 °F 0.0139
  • Vapour, at one atmosphere pressure at 86 °F 0.0169 Viscosity

Centipoises:

  • Saturated liquid at 5 °F 0.13
  • Saturated liquid at 86 °F 0.065
  • Vapour at saturation pressure at 5 °F 0.013
  • Vapour at one atmosphere pressure at 86 °F 0.015
  • Relative dielectric strength of vapour at
    ambient temperature and one atmosphere
    pressure (Nitrogen = 1) 0.88
  • Colour Clear and water white
  • Flammability Non-flammable
  • Toxicity, Underwriters Laboratories classification Group 5a

Quality criteria for initial and recharge are as follows:

  • The vapour phase shall not be less than 99.5% carbon dioxide with no detectable odour
  • The water content of the liquid phase shall not be more than 0.01% by weight (–30 °F dew point)
  • Oil content shall not be more than ten parts per million by weight