Medical Gas Pipe Sizing Calculator
Size medical gas piping systems per NFPA 99 requirements
Outlet Information
System Configuration
Piping Requirements
Main Pipe Size
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Total Flow (SCFM)
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Design Flow Rate
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Diversity Factor
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Equivalent Length
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Branch Size (risers)
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Note: Medical gas piping must be Type K or L copper, ACR grade, cleaned for oxygen service.
Flow Rates by Outlet Type
| Location | O2/Air | N2O | Vacuum |
|---|---|---|---|
| Operating Room | 20 SCFM | 10 SCFM | 3 SCFM |
| ICU/CCU | 10 SCFM | -- | 1.5 SCFM |
| Patient Room | 1 SCFM | -- | 1 SCFM |
| Recovery | 10 SCFM | 5 SCFM | 2 SCFM |
NFPA 99 Requirements
- Type K or L copper pipe only
- Brazed joints (AWS/BCuP series)
- Cleaned for oxygen service
- Nitrogen purge during brazing
- Testing: 150 PSI for 24 hours
- Certification by installer required
Pipe Sizing Table - Oxygen/Medical Air (50 PSI)
| Pipe Size | 100 ft | 200 ft | 300 ft | 500 ft |
|---|---|---|---|---|
| 3/8" | 7 SCFM | 5 SCFM | 4 SCFM | 3 SCFM |
| 1/2" | 18 SCFM | 13 SCFM | 10 SCFM | 8 SCFM |
| 3/4" | 50 SCFM | 35 SCFM | 29 SCFM | 22 SCFM |
| 1" | 110 SCFM | 78 SCFM | 64 SCFM | 50 SCFM |
| 1-1/4" | 210 SCFM | 150 SCFM | 120 SCFM | 95 SCFM |
| 1-1/2" | 340 SCFM | 240 SCFM | 200 SCFM | 155 SCFM |
| 2" | 700 SCFM | 500 SCFM | 410 SCFM | 315 SCFM |