How does CO 2 work CO2 is discharged into an enclosure or directly - - PowerPoint PPT Presentation

What is CO2

• It is derived from Process waste and therefore not classed

as a GWP gas.

• CO2 is naturally Occuring Gas
• No - Ozone depletion potential (ODP)
• No - Global warming potential (GWP)
• No - Atmospheric life
• CO2 is colourless and odourless
• CO2 is stored as a liquid in a cylinder
• CO2 is for total flood and local application uses
• CO2 is for unoccupied applications only as it is hazardous to

humans at the concentrations required to extinguish fires

How does CO2 work

• CO2 is discharged into an enclosure or directly on to the surface

requiring protection, and displaces the oxygen.

• CO2 reduces the oxygen level to below that which can support

combustion (the concentration varies depending on type of fire and risk).

Fire Extinguished

• CO2 creates a cooling effect on the fire and surrounding areas
• The minimum CO2 fire extinguishing concentration of 34% is NOT life

supporting

• CO2 is suitable for surface & deep seated class ‘A’ fires
• CO2 is suitable for flammable liquids & gas applications
• CO2 is suitable for live electrical equipment applications

The Benefits of CO2

• Clean agent
• Proven components
• Established technology
• High availability
• Low maintenance
• Low/High pressure systems
• Total flood/local applications
• Initial and extended discharge
• Class A,B,C and E fires
• BS 5750 Quality Assurance
• BS and NFPA design codes

• 79oC

Atmospheric 1 Bar 5.17 Bar 69 Bar Critical temperature Liquid region Vapour region Triple point Solid region Temperature - oC

• 57oC

0oC 31oC Pressure - Bar 21oC 58 Bar

CO2 - Systems

لباب راشفنیئاپ راشف

Total Flood Local Application Total Flood Local Application

CO2 - High Pressure Storage

• Seamless steel cylinder - 45kg CO2
• 2/3 full liquid CO2
• 1/3 full CO2 vapour - 58 bar
• Reduced fill - tropics

CO2 - High Pressure Storage

Low Pressure Storage

• 20 bar @ -20oC
• Lagged pressure vessel
• Refrigeration unit
• CO2 bulk storage
• Multi discharge capability

Low Pressure Systems

• Bulk
• Mini-Bulk

Low Pressure Bulk Systems Advantages

• Wide range of storage tanks (680 - 54,430kg)
• Any fire control panel can be used
• Light weight valves + manual override
• Can be remotely located up to 150 mtrs
• Options for different power supply requirements
• FM approved option
• Total flooding, inerting, local application, extended

discharge systems, hose reel systems

Low Pressure CO2 Bulk Systems

Low Pressure Mini-Bulk Advantages

• FM Approved
• Wide range of storage tanks,159, 227, 363, 454 and 680 kg

(manifolding possible)

• Savings on footprint - max. diameter 112 cm for 680 kg tank
• Easy to service, no weighing (pressure gauges)
• Filling on site by CO2 bulk tankers
• Options for different power supply requirements
• Hose reel systems possible
• Stainless steel tanks

Low Pressure Mini-Bulk Systems

Total Flood Applications

Flammable liquid stores Gas turbines Engines Oil -filled switchgear Cable ways Transformers Surface Deep Seated

     

High Pressure

Coal silos and ball mills/pulverisers Turbo-generators Cement pulverising & dust collectors Paint mixing

   

Low Pressure

Total Flood Applications - cont’d

Local Applications

Coating machines Fuel transfer/lube oil pumps Grinding mills Aluminium & Steel rolling mills Printing presses & ink storage Quench tanks Manual CO2 hosereels

High Pressure Low Pressure System

          

CO2 - Design Basis

• BS - 5306 Part 4
• NFPA - 12
• Min. concentration 34%
• Electrical risks 50%

CO2 - Limitations

• Life safety -
• Above 5% hazardous
• Consider need for interlocks
• Heavier than air -
• Low level vent & purge required

CO2 - Other Limitations

• Thermal shock
• Static electricity
• Enclosure leakage

CO2 - Features & Benefits

• Simple technology
• Low cost gas
• Clean agent
• High pressure storage
• Low pressure storage
• Local application
• Total flooding
• Non-corrosive

– High reliability – Cost effective – No residue, no decomposition – Cost effective < 1 tonne – Large systems, Tanker filling, multishot – Risk specific protection – Volume protection – Ideal for electronic systems

CO2 - Features & Benefits cont.

– Rapid extinguish 1 min discharge – Only gas suitable – Central bank high/low pressure – Leaking enclosures – Manual fire fighting – Explosion hazards – Long term availability worldwide

• Surface
• Deep seated
• Directional valves
• Extended discharge
• Hosereels
• Inerting
• Naturally occurring inert gas

Summary

CO2 :

• Inert gas
• Available worldwide
• Clean agent
• Surface & deep seated fires
• Total flood & local application
• High pressure (58bar)
• Low pressure (20 bar)

CO2

SIMPLE RELIABLE VERSATILE

Cost effective fire protection for unmanned applications

• Wormald has many years experience in the CO2 extinguishing

systems market around the World

• Some of the applications for CO2:
• Archives
• Coating Machines
• Commercial Fryers
• Degreasing and Cleaning
• Processors
• Dip Tanks
• Electrical Cabinets
• Flammable Liquid Storage
• Flow Coating Machines

Applications

• Floor Covering Machines
• Lubricating Oil Plants
• Printing Machines
• Rolling Mills
• Turbines
• Spray Booths
• Switch Rooms
• Waste Disposal Equipment

And many more Commercial and industrial uses.