Learn fire fighting & fire alarm system design as per NBC 2016 with hydrant, sprinkler, pump calculations, FAVA system, and real MEP standards. Download tools.

Designing a fire fighting and fire alarm system is not just about compliance—it’s about saving lives, protecting assets, and ensuring uninterrupted building operations.

As per NBC 2016 (Part 4) and modern MEP practices, every building—especially high-rise—must integrate:

• Fire Hydrant System
• Automatic Sprinkler System
• Fire Alarm & Voice Evacuation (FAVA)
• Smoke Control System
• Passive Fire Protection

This guide explains complete fire system design standards, used in large-scale developments.

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🧯 1. Fire Fighting System Design (NBC 2016)

💧 Fire Water Storage Tank Design

• Must comply with NBC 2016 + CFO NOC
• Underground tank depth: Max 7m
• Minimum requirement:
  • 2 compartments (maintenance purpose)
  • Secure manholes (not in driveways)

👉 For large projects:

• Common fire tank allowed for multiple buildings
• Basement >3000 m² → Fire compartment with drencher system

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⚙️ Fire Pump Selection Criteria

Fire pump design depends on building height:

Building Height	Pump Type
Up to 70m	Horizontal End Suction
70–150m	MSMO Pumps
Above 150m	Pressure Zoning Mandatory

Standard Configuration:

• 2 Working + 1 Standby Pump
• Jockey Pump: 1W + 1S
• Diesel Pump: Only if required by authority

👉 Pumps must operate:

• Auto Start
• Manual Stop

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🚰 Hydrant System Design

Internal Hydrant:

• Required for buildings >15m
• Fire Hose Cabinet (FHC) on each floor
• Coverage: 36m radius
• Riser size: Minimum 150mm

Pressure Requirement:

• 3.5 to 5.5 bar

External Hydrant:

• Spacing: 30m
• Distance from building: 2m to 15m

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💦 Sprinkler System Design

• Mandatory for areas > 55 sqft
• Max pressure: 12 bar
• Clearance from AC units: ≥450 mm

Sprinkler Types:

• Residential/Office → Pendent / Sidewall
• Kitchen → Heat-resistant
• Ceiling void → Upright

👉 Double height areas → Quick Response sprinklers required

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🌊 Drencher System (Water Curtain)

Used where fire walls are not possible:

• Nozzle: K-32
• Spacing: 2.4m
• Duration: 1 hour
• Minimum pressure: 2 bar

👉 Must integrate with fire alarm system for automatic activation

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🔔 2. Fire Alarm System (FAVA Design)

⚡ Why Addressable Fire Alarm System?

Modern buildings require:

• Exact fire location detection
• Faster response
• Integration with HVAC, lifts, access control

👉 Always use UL Listed / NFPA compliant systems

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📍 Detector Placement Rules

Device	Application
Smoke Detector	Rooms, corridors
Heat Detector	Kitchen, parking
Beam Detector	Atrium (>7m height)
MCP	Exit routes

Key Design Rule:

• Smoke detector spacing: Max 9m

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🔊 Voice Alarm & Evacuation System

FAVA system ensures:

• Controlled evacuation
• No panic situations

Evacuation Logic:

• Fire floor
• 2 floors above
• 1 floor below

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🏢 Fire Command Centre (FCC)

Must include:

• Fire Alarm Panel
• Voice Alarm Panel
• Pump Control

📍 Location: Ground floor near entrance

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🔁 Two-Knock Fire Detection System

• 1st Detector → Investigation Mode
• 2nd Trigger → Evacuation Mode

👉 Prevents false alarms and panic

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🌫️ 3. Smoke Control System

• Parking ventilation:
  • Normal: 6 Air Changes/Hour
  • Fire: 12 Air Changes/Hour
• Staircase & lift lobby:
  • Pressurization mandatory

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🧱 4. Passive Fire Protection

Critical for fire containment:

• Fire rating: 120 minutes
• Fire sealing:
  • Plastic pipes → Intumescent
  • Metal → Acrylic

Fire Doors:

• 2-hour fire-rated with smoke seal

👉 Escape routes must always remain clear

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🪟 5. Fireman Access & Smoke Vent Design

Fireman Access Window:

• Size: 1.5m × 1.5m
• Height: 1.2m from floor
• Spacing: 15m

Smoke Vent:

• Area: 2.5% of floor area
• Auto-operated via fire alarm system

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🏗️ Manufacturing Brands (India + International)

🔹 Fire Pumps

• Kirloskar
• Grundfos
• Xylem

🔹 Fire Alarm Systems

• Honeywell
• Siemens
• Bosch

🔹 Sprinklers & Valves

• Tyco
• Viking
• HD Fire

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❓ FAQ (Schema Ready)

Q1. What is the minimum pressure for hydrant system?

👉 3.5 to 5.5 bar

Q2. Is sprinkler required in all rooms?

👉 Required for areas >55 sqft

Q3. What is FAVA system?

👉 Fire Alarm + Voice Evacuation system for controlled evacuation

Q4. What is two-knock system?

👉 Fire confirmed only after 2 triggers to avoid false alarms

Q5. What is smoke vent area requirement?

👉 2.5% of floor area

🚀 Conclusion

A properly designed fire fighting and fire alarm system is a combination of:

• Engineering precision
• Regulatory compliance
• Smart automation

Following NBC 2016 + modern MEP standards ensures:

✅ Life safety
✅ Faster fire response
✅ Reduced damage
✅ Approval without delays

📢 Why Download from MEPWORK?

• Free DWG files
• Ready-to-use drawings
• Designed for engineers
• Updated as per industry standards

 

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