Flow Metering
Batch Totalizer
Batch total V = Q t and time t = V/Q.
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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
Orifice dP-Flow (Screening)
Orifice screening Q = C sqrt(dP/rho). Calibrate C from one known point; full ISO 5167 for custody.
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Flow Unit Converter
GPM to m3/h (x0.2271) and LPM (x3.785).
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Mass Volume Flow Converter
Mass volume flow via density: m = rho Q.
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Suction Energy Screen
Suction-energy screening index = De x n x Q_BEP / 1e6. High values need API 610 review.
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Pump Specific Speed
Specific speed Ns = n sqrt(Q) / H^0.75 (Q m3/s, H m/stage). Radial < 40, mixed 40-80, axial > 80.
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Pump Parallel / Series Compare
Parallel Q adds at same H; series H adds at same Q. Screening before curve intersection.
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NPSHa vs NPSHr Check
NPSHa screening with >= 1 m margin rule.
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Pump Affinity Laws
Affinity laws: Q2=Q1(N2/N1), H2=H1(N2/N1)^2, P2=P1(N2/N1)^3.
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System Curve Builder
System curve H = H_static + kQ^2. Calibrate k from one known duty point.
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Equivalent Length
Equivalent length Le = (Le/D) x D. Typical Le/D: 90 elbow 30, tee run 20, gate 8, globe 340.
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Minor Loss (Fittings & Valves)
Minor loss dP = sumK x rho v^2 / 2. Enter K from table help.
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