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

What is CO 2 • 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 CO 2 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 CO 2 • 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

Critical 69 Bar temperature Liquid region 58 Bar Pressure - Bar Vapour Solid region region 5.17 Bar Triple point Atmospheric 1 Bar -79 o C -57 o C 0 o C 21 o C 31 o C Temperature - o C

CO 2 - Systems لباب راشف نیئاپ راشف Total Local Total Local Flood Application Flood Application

CO 2 - High Pressure Storage • Seamless steel cylinder - 45kg CO 2 • 2/3 full liquid CO 2 • 1/3 full CO 2 vapour - 58 bar • Reduced fill - tropics

CO 2 - High Pressure Storage

Low Pressure Storage • 20 bar @ -20 o C • Lagged pressure vessel • Refrigeration unit • CO 2 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 CO 2 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 CO 2 bulk tankers • Options for different power supply requirements • Hose reel systems possible • Stainless steel tanks

Low Pressure Mini-Bulk Systems

Total Flood Applications High Pressure Deep Surface Seated  Flammable liquid stores  Gas turbines  Engines  Oil -filled switchgear  Cable ways  Transformers

Total Flood Applications - cont’d Low Pressure Coal silos and ball mills/pulverisers   Turbo-generators  Cement pulverising & dust collectors  Paint mixing

Local Applications System High Low Pressure Pressure  Coating machines  Fuel transfer/lube oil pumps  Grinding mills   Aluminium & Steel rolling mills   Printing presses & ink storage   Quench tanks   Manual CO 2 hosereels

CO 2 - Design Basis • BS - 5306 Part 4 • NFPA - 12 • Min. concentration 34% • Electrical risks 50%

CO 2 - Limitations • Life safety - - Above 5% hazardous - Consider need for interlocks • Heavier than air - - Low level vent & purge required

CO 2 - Other Limitations • Thermal shock • Static electricity • Enclosure leakage

CO 2 - Features & Benefits • – High reliability Simple technology • – Cost effective Low cost gas • – No residue, no decomposition Clean agent • – Cost effective < 1 tonne High pressure storage • – Large systems, Tanker filling, multishot Low pressure storage • – Risk specific protection Local application • – Volume protection Total flooding • – Ideal for electronic systems Non-corrosive

CO 2 - Features & Benefits cont. • – Rapid extinguish 1 min discharge Surface • – Only gas suitable Deep seated • – Central bank high/low pressure Directional valves • – Leaking enclosures Extended discharge • – Manual fire fighting Hosereels • – Explosion hazards Inerting • – Long term availability worldwide Naturally occurring inert gas

Summary CO 2 : • Inert gas • Available worldwide • Clean agent • Surface & deep seated fires • Total flood & local application • High pressure (58bar) • Low pressure (20 bar)

CO 2 SIMPLE RELIABLE VERSATILE Cost effective fire protection for unmanned applications

Applications • Wormald has many years experience in the CO2 extinguishing systems market around the World • Some of the applications for CO2: • Archives • Floor Covering Machines • Coating Machines • Lubricating Oil Plants • Commercial Fryers • Printing Machines • Degreasing and Cleaning • Rolling Mills • Processors • Turbines • Dip Tanks • Spray Booths • Electrical Cabinets • Switch Rooms • Flammable Liquid Storage • Waste Disposal Equipment • Flow Coating Machines And many more Commercial and industrial uses.