EngineerHub category // Fluid & Piping
Fluid Mechanics & Piping
Solve pipe-flow, pressure-drop, pump, valve and gas-flow problems, then use interactive simulations to understand system curves, cavitation and fluid behaviour.
26 calculator / tools4 interactive simulators1 study material1 case study32 pages total
The fluid-mechanics collection covers the core calculations used in piping and hydraulic systems: conservation of energy, friction loss, flow regime, pump duty, NPSH, valve capacity, gas pressure drop and pipe sizing. Where useful, calculators are paired with visual or system-level simulators so the equations can be connected to physical behaviour.
Choose a tool below by purpose. Individual pages include their own assumptions, equations, references and limitations where applicable.
Calculators & tools
26 pages
Bernoulli Equation CalculatorSolve the extended Bernoulli equation for pressure, velocity, elevation or pump head in SI or US customary units.→Compressor Power CalculatorEstimate ideal-gas compressor shaft power, electrical input and discharge temperature from mass flow, pressure ratio and efficiency.→Control Valve Cv / Kv CalculatorCalculate preliminary control-valve Cv and Kv for liquid service with choking checks, plus gas/vapour effective-area screening.→Darcy–Weisbach CalculatorCalculate Darcy–Weisbach head loss, pressure drop, friction factor and pump power for circular pipe flow.→Excavation Dewatering Screening ModelScreening-level estimate of groundwater inflow to an excavation using Sichardt's radius-of-influence formula combined with the Dupuit (unconfined) or Thiem (confined) equations.→Gas Pipe Flow CalculatorEstimate low-pressure gas flow capacity with the historical Spitzglass equation for educational screening; verify final sizing with the locally adopted fuel-gas code and supplier data.→Gas Pipe Pressure Drop CalculatorEstimate low-pressure fuel-gas pressure drop from standard flow, internal diameter, developed length and gas specific gravity using an inverse Spitzglass screening correlation; verify…→Hazen–Williams CalculatorCalculate Hazen–Williams water-pipe head loss, pressure drop, velocity and hydraulic gradient.→Home Heat Pump Size & Running Cost CalculatorEstimate air-source or ground-source heat-pump size, design heat loss, cold-weather output, annual electricity use and home heating cost in SI or US units.→Moody Chart CalculatorCalculate Darcy friction factor from Reynolds number and relative roughness and plot the point on a Moody chart.→Orifice Flow CalculatorCalculate incompressible liquid flow through a sharp-edged orifice plate from differential pressure, beta ratio, fluid density and a user-specified discharge coefficient.→Pipe Flow & Head Loss CalculatorCalculate pipe velocity, Reynolds number, friction head loss and pressure drop using Hazen-Williams or Darcy-Weisbach in SI or US customary units.→Pipe Freeze Time & Heat-Trace Sizing ToolEstimate when stagnant water in an insulated pipe may begin to freeze, the idealized full-freeze time, and the heat-trace output needed for freeze protection.→Pipe Insulation Thickness CalculatorEstimate cylindrical pipe insulation thickness needed to meet a target heat loss using conductivity, temperatures and outside heat transfer.→Pipe Stress Screening CalculatorScreen pipe hoop, longitudinal, bending and restrained thermal stresses. Includes SI and US Customary inputs, utilization and worked guidance.→Pipe Velocity CalculatorCalculate pipe velocity, Reynolds number, mass flow and velocity head with selectable pipe materials, common nominal pipe sizes, liquids and gases in SI or US customary units.→Pipe Wall Thickness CalculatorEstimate minimum straight-pipe wall thickness for internal pressure using ASME B31.3-style factors, allowances and mill tolerance in SI or US customary units.→Pump Affinity Laws CalculatorPredict how a centrifugal pump's flow, head and power change with impeller speed or diameter, using the pump affinity laws.→Pump Efficiency CalculatorCalculate pump hydraulic power, shaft power, and overall wire-to-water efficiency from flow rate, head, and motor input power.→Pump NPSH CalculatorCalculate pump NPSH available from pressure, suction elevation, losses, velocity and vapor pressure. Compare NPSHa with NPSHr in SI or US units.→Pump Operating Point CalculatorFind where a pump curve and system curve intersect, from a pump's shutoff head and rated point plus the system's static head and resistance coefficient.→Pump System Power & Head Loss CalculatorEstimate pump total dynamic head, pipe friction, fitting losses, velocity, hydraulic power, shaft power and electrical input in SI or US units.→Reynolds Number CalculatorCalculate Reynolds number, mean velocity and internal-flow regime in SI or US customary units.→Steam Pipe Sizing CalculatorCalculate required steam pipe diameter from mass flow rate, steam density and target velocity, with guidance on typical velocity ranges by service.→Sump Pump and Backup Runtime CalculatorCalculate sump pump cycle time, duty cycle and short-cycling risk from basin geometry and flow rates, then estimate battery backup runtime during a power outage.→Well Pump Backup Runtime & Recovery CalculatorCalculate pressure tank drawdown using Boyle's Law, well pump cycle time, and battery backup runtime for household water usage during a power outage.→
Interactive simulators
4 pages
Cavitation & Pump NPSH SimulatorInteractive pump cavitation and NPSH simulator with a 2.5D impeller cutaway, NPSH-vs-flow curves, temperature effects, suction losses and cavitation number.→Fluid Pressure & Flow Visual SimulatorInteractive fluid pressure and flow simulator with 10 visual fluid mechanics demonstrations: Venturi, siphon, manometer, airfoil, Magnus effect, hydraulic press, buoyancy, water tower,…→Pump System Curve Calculator & SimulatorPlot centrifugal pump and system curves, find the operating point, estimate shaft power and efficiency, and screen NPSH margin and suction conditions.→Vacuum Pump-Down Simulator & Economics ToolEstimate vacuum chamber pump-down time, attainable pressure, energy per cycle, annual operating cost and pump-upgrade payback. Includes gas load and SI/US units.→
Study materials
1 page
Case studies
1 page