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GPM
ft/s
Minimum Diameter
1.17 in
Querschnittsfläche1.069 sq in
Minimum Diameter vs Required Flow
Formel
## Pipe Sizing Rearrange the continuity equation Q = A x V to solve for the minimum cross-sectional area, then back-calculate the diameter. **D = 2 x sqrt( Q / (V x pi) )** Always round up to the next standard pipe size available from your supplier.
Lösungsbeispiel
Need 20 GPM at a maximum velocity of 6 ft/s.
- 01Q = 20 / 448.831 = 0.04456 cu ft/s
- 02A = 0.04456 / 6 = 0.007427 sq ft
- 03D = 2 x sqrt(0.007427 / pi) x 12 = 1.17 in
- 04Choose the next standard size: 1-1/4 inch pipe.
Häufig Gestellte Fragen
What standard pipe sizes are available?
Common nominal sizes are 1/2, 3/4, 1, 1-1/4, 1-1/2, 2, 2-1/2, 3, and 4 inches for residential plumbing.
Why does velocity matter?
Excessively high velocity causes water hammer, noise, and erosion. Most codes limit domestic supply to about 8 ft/s.
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