Fire Sprinkler Pipe Sizing
Size fire sprinkler piping using pipe schedule or hydraulic calculation methods
Design Area
Most remote design area
System Configuration
Design Requirements
Branch Line Size
--
Cross Main Size
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Feed Main/Riser
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Design Density
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Sprinklers Operating
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Min Sprinkler Pressure
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Estimated System Flow
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Note: Pipe schedule method shown. Hydraulic calculation required for most installations.
Design Density Requirements
| Hazard | Density | Area |
|---|---|---|
| Light | 0.10 GPM/sf | 1,500 sf |
| Ordinary 1 | 0.15 GPM/sf | 1,500 sf |
| Ordinary 2 | 0.20 GPM/sf | 1,500 sf |
| Extra 1 | 0.30 GPM/sf | 2,500 sf |
| Extra 2 | 0.40 GPM/sf | 2,500 sf |
Important Notes
- Must be designed by licensed fire protection engineer
- Hydraulic calculations required for most systems
- Add hose demand per NFPA 13
- Verify water supply adequacy
- Submit to AHJ for approval
Pipe Schedule - Light Hazard (Steel Pipe)
| Pipe Size | Max Sprinklers (Steel) | Max Sprinklers (Copper) | Max Sprinklers (CPVC) |
|---|---|---|---|
| 1" | 2 | 2 | 2 |
| 1-1/4" | 3 | 3 | 3 |
| 1-1/2" | 5 | 5 | 5 |
| 2" | 10 | 12 | 10 |
| 2-1/2" | 30 | 40 | 30 |
| 3" | 60 | 65 | 60 |
| 4" | Unlimited | Unlimited | Unlimited |