Piping & Head Loss
LMTD (Log Mean Temperature Difference)
Thermal driving force from four terminals.
Open calculatorCalculators
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.
Control Valves
Safety Valve Sizing (Vapor, Screening)
Critical-flow orifice area on API 520 basis.
Open calculatorFlow Metering
Blend Calculator (Temperature + Concentration)
Two-stream mass and energy balance.
Open calculatorControl Valves
Choked Flow & Cavitation Check
Allowable drop with choked-flow flag.
Open calculatorFlow Metering
Weir Flow (V-Notch + Rectangular)
Open-channel weir equations side by side.
Open calculatorPiping & Head Loss
Hydraulic Diameter
Dh = 4A/P plus equivalent circular diameter.
Open calculatorPiping & Head Loss
Gas Pipeline Pressure Drop (Screening)
Single-pass gas line drop with Haaland friction.
Open calculatorPiping & Head Loss
Pipe Wall Thickness (Barlow)
Barlow wall with mill and corrosion allowance.
Open calculatorTanks & Level
Capsule (Bullet) Tank Volume
Horizontal capsule volume at any level.
Open calculatorControl Loops
PID Tuning (Ziegler-Nichols)
Classic ZN P/PI/PID gains from Ku and Tu.
Open calculatorPumps
VFD Energy Savings & Payback
Affinity-law savings with payback years.
Open calculatorPumps
Pump Duty Point Solver
Pump-system curve intersection, closed form.
Open calculator