Process Engineering
Planning calculators for process engineering — estimates from industry-style inputs.
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Heat Exchanger Duty Calculator
Calculate heat exchanger duty using the Log Mean Temperature Difference (LMTD) method: Q = U × A × ΔTlm for counter-current or parallel flow.
Control Valve Cv Sizing Calculator
Size control valves per ISA/IEC 60534 for liquid or gas service. Calculate required Cv, check for choked flow, and select nearest standard valve size.
Relief Valve Sizing Calculator
Size pressure relief valves per API 520/526 for gas/vapor service. Calculates required orifice area and selects the standard API 526 orifice designation.
Process Control Loop Tuning Calculator
Calculate PID controller tuning parameters using Ziegler-Nichols, Cohen-Coon, or IMC (Lambda) methods from process step-response data (gain, dead time, time constant).
Energy Balance Calculator
Calculate steady-state energy balance for a process stream. Includes sensible heat (Q = mCpΔT), latent heat of phase change, and reaction heat contributions.
Pressure Vessel Sizing Calculator
Size pressure vessels per ASME Section VIII. Calculate shell and head wall thickness (UG-27), vessel volume, and weight estimate for hemispherical, ellipsoidal, or torispherical heads.
Mass Balance Calculator
Solve steady-state mass and component balances around a separation unit. Calculate product/waste flow rates, component recovery, split ratio, and yield.
Pipe Pressure Drop Calculator
Calculate pipe friction pressure drop using the Darcy-Weisbach equation with Swamee-Jain friction factor. Handles laminar, transition, and turbulent flow regimes.
Distillation Reflux Ratio Calculator
Shortcut distillation design using Fenske-Underwood-Gilliland method. Calculate minimum stages, minimum reflux ratio, actual trays, and column material balance.
Pump NPSH Calculator
Calculate Net Positive Suction Head available (NPSHa) and pump shaft power. Verify cavitation margin against required NPSH from the pump curve.