Sch 40 Steel • 50°F Water • Auto updates. Shows pipe dimensions, velocity, Reynolds number, friction factor, head loss, elbow loss, and pipe + fluid weight.
| Dimensions | |
| Outside Diameter | |
| Wall Thickness | |
| Inside Diameter | |
| Section Properties | |
| Inside Area | |
| Cross Section Area | |
| Section Modulus | |
| Moment of Inertia | |
| Radius of Gyration | |
| Weight | |
| Weight of Pipe | |
| Weight Pipe + Fluid | |
| Fluid Properties | |
| Fluid density | |
| Fluid viscosity | |
| Specific Heat | |
| Energy factor | |
| Flow Results | |
| Fluid velocity | |
| Reynolds Number | |
| Friction factor | |
| Head Loss | |
| Elbow loss | |
This chilled water pipe calculator helps HVAC engineers and draftsmen quickly check pipe size, velocity, Reynolds number, Darcy friction factor, head loss, elbow loss, and pipe + fluid weight for Schedule 40 steel using 50°F water. Results update instantly as you change pipe size or flow.
Turn on Suggest pipe to size by your preferred design targets. Set Target Velocity and Target Head Loss, then adjust weights to prioritize lower velocity (noise/erosion control) or lower head loss (pump energy). The tool returns the closest match plus the next size down and next size up.
Enable penalty to discourage selecting a pipe that exceeds your max velocity. When velocity goes above the limit, the score increases, pushing the recommendation toward the next larger size.
| Check | Typical range | Why it matters |
|---|---|---|
| Velocity | 4–8 ft/s (≈1.2–2.4 m/s) | Controls noise, erosion, and balancing stability |
| Head loss | 2–6 ft/100 ft (≈2–6 m/100 m) | Trade-off between pipe size and pump energy |
| Max velocity | ~10 ft/s (≈3.0 m/s) | Use penalty to avoid overspeed selection |
This calculator provides engineering estimates. Always verify final sizing using project specifications, total equivalent length, fittings count, and commissioning/balancing requirements.