Pressure drop and flow rate calculators
Helper calculators

Features

  1. Calculate pressure drop for known flow rate,
  2. Calculate flow rate for known pressure drop,
  3. Darcy friction coefficient calculation,
  4. Minor losses calculation,
  5. Laminar and turbulent flow,
  6. Flow velocity calculation.

Liquid flow

  1. Incompressible (ρ=const.) flow of liquids,
  2. Darcy equation based,
  3. Circular and rectangle closed pipe,
  4. Applicable for low pressure drop gas flow also.

Air flow

  1. Compressible and isothermal (ρ≠const , T=const.) flow of air in a closed round pipe.

Natural gas flow

  1. Applicable for natural gas lines over 1 bar, longer than 1 m,
  2. Renouard equation based.

Gas flow

  1. Compressible isothermal flow
  2. Applicable for any perfect gas in long closed round pipe.

Adiabatic gas flow - outflow

  1. Short distance pipe line and outflow computation of any perfect gas.

Pipe diameter

  1. Calculate pipe diameter for known flow rate and velocity,
  2. Calculate flow velocity for known pipe diameter and flow rate,
  3. For liquids and perfect gases,
  4. Convert from volumetric to mass flow rate,
  5. Calculate volumetric flow rate of perfect gas at different conditions of pressure and temperature.

Resistance coefficient K

  1. Resistance coefficient K for elbows, bends, tees, pipe entrance, pipe exit, reducers, enlargement.

Reynolds

  1. Determine if the flow is laminar or turbulent,
  2. For liquids and perfect gases,
  3. Input either velocity, or volumetric, or mass flow rate and calculate Reynolds number.
Flow rate computation in pressure differential devices
Control valve calculators

Features

  1. Calculate flow rate in pipe based on the created pressure drop,
  2. Reynolds number calculation,
  3. For liquids and perfect gases,
  4. Flow velocity calculation,
  5. Convert between volume and mass flow rate.

Orifice plate

  1. Calculate orifice diameters,
  2. Discharge and expansion coefficient computation,
  3. For corner taps, 1 inch taps and D and D/2 taps,
  4. Orifice graphic presented.

Venturi tube

  1. Venturi effect calculation,
  2. Venturi graphic presented.

Nozzle and Venturi nozzle

  1. Venturi effect in nozzle calculation.

Control valve sizing calculator

Calculate flow coefficient Cv or Kv of liquid control valve for known flow capacity and pressure difference, maximum flow capacity of control valve for known flow coefficient Cv or Kv and pressure difference or pressure difference for know flow coefficient Cv or Kv and flow capacity and select liquid control valve size.

Gas control valve calculator

Calculate flow coefficient Cg or Kg, maximum capacity of control valve or pressure regulator for known upstream and downstream pressure or pressure drop that control valve is creating for known flow rate and flow coefficient Cg or Kg and select correct gas control valve or pressure regulator from manufacturer's flow table.

Prandtl probe - Pitot tube

  1. Flow velocity, Mach number, flow rate, speed of sound calculation,
  2. Calculate velocity from dynamic pressure,
  3. Convert from volumetric to mass flow rate,
  4. For liquids and perfect gases,
  5. For subsonic and supersonic perfect gas flow.

Thermal energy

  1. Calculate heat energy and thermal power for known flow rate,
  2. Calculate flow rate for known heat energy or thermal power,
  3. Applicable for boilers, heat exchangers, radiators, chillers, air heaters.

LPG flow

  1. LPG flow rate calculation for known heat power,
  2. LPG heat power calculation for known flow rate,
  3. Pipe diameter calculation for liquid and gas phase,
  4. LPG flow velocities calculation for liquid and gas phase,
  5. For propane and butane different mixture ratios.

Oil specific gravity

  1. Conversion between API degrees, Baume degrees and specific gravity,
  2. Applicable for all liquids, but most common application is for oil,
  3. Calculate also liquid density ρ and specific volume v.