FM 200 Calculation required for fire suppression involves several steps and considerations. Here’s a step-by-step guide to help you through the process:
Step-by-Step Calculation
- Determine the Volume of the Protected Space:
- Measure the length, width, and height of the room in meters.
- Calculate the volume (V) in cubic meters (m³) using the formula: 𝑉=Length×Width×HeightV=Length×Width×Height
- Determine the Design Concentration:
- The design concentration for FM-200 typically ranges from 6.25% to 9% by volume, depending on the fire hazard. This information should be provided in the system’s design specifications or relevant fire protection standards.
- For this example, let’s use a design concentration (C) of 7%.
- Required Mass of FM-200 Calculation:
- FM-200 has a specific vapor density, and its mass can be calculated using the following formula: Mass of FM-200(𝑀)=𝑉×𝐶100×𝜌Mass of FM-200(M)=V×100C×ρ
- Here, 𝜌ρ is the density of FM-200, which is approximately 42 kg/m³ at 20°C.
Example FM 200 Calculation
Let’s assume we have a room with the following dimensions:
- Length = 10 meters
- Width = 5 meters
- Height = 3 meters
1: Calculate the Volume of the Protected Space𝑉=10 m×5 m×3 m=150 m3V=10m×5m×3m=150m3
2: Determine the Design Concentration For this example, we use a design concentration of 7%.
3: Calculate the Required Mass of FM-200𝑀=150 m3×7100×42 kg/m3M=150m3×1007×42kg/m3𝑀=150 m3×0.07×42 kg/m3M=150m3×0.07×42kg/m3𝑀=441 kgM=441kg
Additional Considerations
- Safety Factor: It’s often prudent to include a safety factor in your calculations to account for potential leaks or inaccuracies in measurements.
- System Design and Standards: Ensure that the system design complies with relevant standards such as NFPA 2001, which may have specific requirements and recommendations for FM-200 systems.
- Discharge Time: The system should be capable of discharging the required amount of FM-200 within 10 seconds to ensure effective fire suppression.
- Room Integrity: The room should be sufficiently sealed to prevent FM-200 from escaping before it can suppress the fire.
Final Notes
- Always consult with a fire protection engineer or professional to ensure that your calculations and system design are accurate and compliant with local regulations and standards.
- Regular maintenance and testing of the FM-200 system are crucial to ensure it will function correctly in the event of a fire.
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