Itemized operating-torque calculator for concentric (resilient-seated) butterfly valves: seating + bearing + packing, with manufacturer calibration and actuator sizing. Built around the AWWA M49 component method.
Shell and head thickness to ASME VIII-1 (UG-27, UG-32), the plate to buy, the MAWP it gives you and the hydrotest pressure — with the formulas shown.
Friction loss for water in a pipe — velocity, Reynolds number, Swamee–Jain friction factor, Darcy–Weisbach head loss in feet and psi.
NEC copper ampacity for AWG 14–2 at 60/75/90 °C, plus the voltage drop and percent drop over a run at your load current.
Resistance, power and conductance from a voltage and a current — V = I·R and P = V·I, solved for a DC circuit.
Built with MetaModel
Build calculators and interactive models from formulas — no code required.