Multi-Stage Orifice Pressure Let-Down
Size a restriction-orifice train (1–6 plates). Adjust upstream/downstream pressure, flow, pipe size and spacing; see the staged pressure profile, per-plate cavitation index and a live side-view with the cavitation made visible.
Open calculator ● LIVEChemical Dosing & Dilution
Main process flow with single, double or triple dosing lines — each switchable and colour-coded. Pick the chemical (chlorine, ferric, caustic, acids, polymer…), set pump flows, and see total combined flow, per-chemical dose (mg/L) and dilution on a live plan-view schematic.
Open calculatorPipe Pressure Drop
Darcy-Weisbach friction loss with Colebrook-White / Moody friction factor for single-phase liquid and gas lines, including fittings.
Pump NPSH & Cavitation
Net positive suction head available vs required, with vapour-pressure and suction-line losses — flag pump cavitation margin.
Control Valve Cv / Kv Sizing
Flow coefficient sizing for liquids and gases with choked-flow and cavitation/flashing checks per IEC 60534.
Open-Channel & Weir Flow
Discharge over weirs and flumes and Manning open-channel flow, with depth, velocity and Froude-number checks.
Each calculator runs entirely in your browser — nothing is uploaded, and results update in real time as you change inputs. Methods follow recognised engineering standards (ISO 5167-2 orifice metering, IEC 60534-8-3 valve noise, control-valve cavitation indices, steady-state mass balance) and are intended as screening tools; for critical or contractual work, confirm against the full standards and project specifications.
More calculators are added regularly. Have a request? Get in touch.