Water Pressure Drop Calculator: 1.25 in, 20 gpm, 50 ft (copper)
Specific conversion page with reference context, calculator, and nearby values.
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1.25 in, 20 gpm, 50 ft (copper) converts to
0.01 psi drop
Use this as a quick reference for Water Pressure Drop Calculator.
Value Details
Input: 1.25 in, 20 gpm, 50 ft (copper)
Output: 0.01 psi drop
Browse all reference values for Water Pressure Drop Calculator
diameterIn: 1.25 | lengthFt: 50 | feetHeadLoss: 0.024 | lossPer100FtPsi: 0.021
Water Pressure Drop Calculator
Estimate pressure loss from flow, pipe diameter, run length, and material roughness.
Estimated Pressure Drop
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Nearby Reference Values
| Scenario | Pressure Drop | Drop / 100 ft (psi) | Head Loss (ft) |
|---|---|---|---|
| 1.25 in, 10 gpm, 100 ft (copper) | 0.006 psi drop | 0.006 | 0.013 |
| 1.25 in, 10 gpm, 150 ft (copper) | 0.009 psi drop | 0.006 | 0.02 |
| 1.25 in, 15 gpm, 50 ft (copper) | 0.006 psi drop | 0.012 | 0.014 |
| 1.25 in, 15 gpm, 100 ft (copper) | 0.012 psi drop | 0.012 | 0.028 |
| 1.25 in, 15 gpm, 150 ft (copper) | 0.018 psi drop | 0.012 | 0.042 |
| 1.25 in, 20 gpm, 50 ft (copper) | 0.01 psi drop | 0.021 | 0.024 |
| 1.25 in, 20 gpm, 100 ft (copper) | 0.021 psi drop | 0.021 | 0.048 |
| 1.25 in, 20 gpm, 150 ft (copper) | 0.031 psi drop | 0.021 | 0.072 |
| 1.25 in, 30 gpm, 50 ft (copper) | 0.022 psi drop | 0.044 | 0.051 |
| 1.25 in, 30 gpm, 100 ft (copper) | 0.044 psi drop | 0.044 | 0.101 |
| 1.25 in, 30 gpm, 150 ft (copper) | 0.066 psi drop | 0.044 | 0.152 |
Frequently Asked Questions
Common questions about Water Pressure Drop Calculator, formulas, and expected usage.
What method is used to estimate pressure drop?
This calculator uses a Hazen-Williams based approximation, commonly applied to water flow in building piping.
Why does smaller pipe increase pressure drop?
Smaller inside diameter increases velocity and friction effects, producing higher pressure loss at the same flow.
What does the C-factor represent?
The Hazen-Williams C-factor models pipe roughness, where higher C values indicate smoother pipe and lower friction loss.
Is this suitable for final engineering design?
Use it for preliminary sizing and comparisons. Final designs should follow code, manufacturer data, and complete hydraulic calculations.
Methodology and Review
This page is generated from the same conversion definition used by the main calculator page, which keeps the calculator, reference table rows, and FAQ schema aligned.
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Use this page as a fast lookup reference, then confirm final project values using applicable standards and manufacturer documentation.