Pumps
Total Dynamic Head (TDH)
Static plus friction, minor and pressure head.
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Flow calculators
Control-valve sizing, piping head loss, pump duty and NPSH, flow metering, tank strapping, and control-loop checks — every output labeled, every formula visible.
Flow Metering
Venturi Meter Flow (Screening)
Venturi dP to flow with throat geometry.
Open calculatorFlow Metering
Gas Flow Correction (Normal to Actual)
Nm3/h to actual m3/h at flowing conditions.
Open calculatorControl Valves
Steam Tables (Screening)
Saturation pressure and enthalpies from temperature.
Open calculatorControl Loops
Split-Range Estimator
Split-range 0-50% drives valve A 0-100%, 50-100% drives valve B 0-100%.
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Flow Signal Damping
Lag filter settle ~5x filter constant. Smaller alpha = heavier damping.
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First-Order Response (tau)
First-order 98% at 4 tau plus dead time.
Open calculatorControl Loops
PID Form Converter
Parallel PID: Ki = Kp/Ti, Kd = Kp Td.
Open calculatorTanks & Level
Tank Fill Time
Fill time t = V/Q (constant rate). Gravity drain per Torricelli noted.
Open calculatorTanks & Level
Dished Head Volume
2:1 SE head approx 0.131 D^3 each.
Open calculatorTanks & Level
Horizontal Tank (Table Factor)
Horizontal cylinder screening V = L x R^2 x fill-table factor. Half-full factor = pi/2.
Open calculatorTanks & Level
Vertical Tank Volume
Vertical tank V = pi/4 D^2 h.
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