Suction Pipe Size Checker
Verifies your suction line against the one-size-up rule and the 1.2 m/s velocity ceiling.
Also: keep suction runs short, slope them up to the pump (no air pockets), and use an eccentric reducer flat-side-up at the pump flange.
Formula
Suction Pipe Size Checker is a free suction pipe size for pump engineers, plumbers and plant designers — instant, accurate and 100% client-side, with the governing formula and reference shown next to the result so the number can be defended, not just quoted.
About Suction Pipe Size Checker
Verifies your suction line against the one-size-up rule and the 1.2 m/s velocity ceiling. The calculation implements V_s = Q/A; D_suction ≥ D_discharge (usually one size up) (ANSI/HI 9.6.6 — pump piping). Also: keep suction runs short, slope them up to the pump (no air pockets), and use an eccentric reducer flat-side-up at the pump flange.
How to use Suction Pipe Size Checker
- 1Enter Pump flow in L/s.
- 2Enter Suction pipe ID in mm.
- 3Enter Discharge pipe ID in mm.
- 4Read Suction velocity, Suction/discharge size ratio instantly — no submit button needed.
- 5Need US units? Flip the SI/Imperial toggle and every field converts.
Why use Suction Pipe Size Checker?
- ✓Implements the standard formula — V_s = Q/A; D_suction ≥ D_discharge (usually one size up)
- ✓Reference cited on-page: ANSI/HI 9.6.6 — pump piping
- ✓One-click SI ⇄ Imperial toggle — values convert in place, physics stays in SI
- ✓Built-in engineering verdict flags out-of-range results instantly
- ✓Runs entirely in your browser — nothing uploaded, free forever
Frequently asked questions
What formula does the Suction Pipe Size Checker use?+
It computes V_s = Q/A; D_suction ≥ D_discharge (usually one size up), per ANSI/HI 9.6.6 — pump piping. The formula is displayed under the result.
What should I keep in mind when using this calculator?+
Also: keep suction runs short, slope them up to the pump (no air pockets), and use an eccentric reducer flat-side-up at the pump flange.
Can I use this for pump selection?+
Use it to establish the duty (flow, head, NPSH, power) and then pick a pump whose curve passes through that point near best efficiency. The tool gives you the engineering numbers a supplier will ask for.
Is the Suction Pipe Size Checker free to use?+
Yes — completely free, no sign-up, no limits. It runs client-side in your browser, so inputs stay private and results are instant even on slow connections.
Related Engineering tools
Reynolds Number Calculator
Compute Re from density, velocity, pipe diameter and viscosity — with instant laminar/turbulent classification.
● LiveLaminar vs Turbulent Flow Classifier
Classify hydraulic-oil or process-fluid flow regime from kinematic viscosity, line velocity and tube bore.
● LiveBernoulli Equation Solver
Solve downstream pressure between two points from velocities, elevations and fluid density (ideal, lossless).
● Live