Air-Foam Fire Extinguishers (OVP): Features, Usage, and Safety
At safsale.com, we’re committed to fire safety, offering a detailed look at Air-Foam Fire Extinguishers (OVP)—a vital tool in fire prevention and control.
What Are Air-Foam Fire Extinguishers?
Air-foam fire extinguishers, designated as OVP (воздушно-пенные), are devices equipped with foam generators and water-based foaming agents. They are designed to suppress fires by creating a dense, cooling foam layer over burning surfaces, effectively cutting off oxygen and reducing heat.
Structure and Working Principle
Each OVP extinguisher consists of:
- Durable Body: Withstands pressures up to 1.5 MPa.
- Gas Cylinder: Contains nitrogen, carbon dioxide, or compressed air for propelling the foam.
- Discharge Mechanism: Includes a siphon tube, nozzle, and foam generator.
When activated, the extinguisher releases foam that expands up to 50-70 times its volume, providing efficient fire suppression.
Types of Air-Foam Fire Extinguishers
By Pressure System:
- Stored-Pressure: Continuous pressure inside the tank.
- Gas Cartridge Models: Release pressure upon activation for extended shelf life.
By Foam Expansion Ratio:
- Low Expansion (5-20): Ideal for targeted fire suppression.
- Medium Expansion (20-200): Covers larger areas effectively.
By Foam Composition:
- Hydrocarbon-Based Foams: Cost-effective and versatile.
- Fluorinated Foams: Enhanced performance but higher cost.
Suitable Applications
Air-foam extinguishers are effective against:
- Class A Fires: Combustible solids like textiles, wood, and paper.
- Class B Fires: Flammable liquids such as oils and fuels.
They are not suitable for:
- Class C Fires: Gas fires.
- Class D Fires: Reactive metals.
- Fires involving electrical equipment or materials that burn without oxygen.
Benefits of Air-Foam Extinguishers
- Safe for Use Around People: No toxic emissions during operation.
- Prolonged Discharge Time: Typically lasts 20-60 seconds.
- Wide Coverage: Ideal for suppressing fires in warehouses, chemical plants, and transportation hubs.
Maintenance and Precautions
- Annual Servicing: Most OVP extinguishers require maintenance every year.
- Storage Guidelines: Keep away from sunlight, high heat, and physical damage.
- Temperature Range: Standard models operate between +5°C to +50°C, with winterized versions extending to -40°C.
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