# Pipe flow calculators

## Most wanted **Calculators**

Most frequently used free online fluid flow calculators for every day flow problems solving. Twenty calculators for desktop and Android smartphones with more to come...

#### Pressure drop

Calculate pressure drop due to friction or local resistances or calculate flow rate for known pressure drop in closed round or rectangle pipe.

Calculator is suitable for laminar and turbulent incompressible flow.

#### Pipe diameter

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

#### Orifice flow

Calculate flow rate in pipe using orifice plate based on the created pressure drop. Calculate flow velocity in front of orifice plate and in the throat. Calculate orifice diameters. Discharge and expansion coefficient calculation included. Convert from volumetric to mass flow rate. Calculate Reynolds number. For liquids and perfect gases. For corner taps, 1 inch taps and D and D/2 taps.

#### Air flow

Isothermal (T=const.) flow of air in a closed pipe. Calculate air pressure drop for known flow rate in a pipe. Calculate air flow rate for know pressure drop in a pipe. Calculate flow velocities on the start and on the end of pipe. Darcy friction factor calculation. Pressure drop due to minor losses and friction.

## Everyday **Calculators**

#### Control valve sizing

Calculate flow coefficient Cv or Kv of liquid control valve for known flow capacity and pressure difference.

#### Natural gas pipeline

Calculate flow rate from known pressure difference in natural gas line with pressure above 1 bar

#### Compressible gas flow

Isothermal (T=const.) flow calculation of any real gas in a closed pipe.

#### Gas discharge flow

Calculate flow rate of compressible gas discharging through valve or pipe to atmosphere.

#### Reynolds number

Calculate Reynolds number from Input velocity, or volumetric, or mass flow rate.

#### Gas control valve sizing

Calculate maximum capacity of control valve or pressure regulator for known upstream and downstream pressure.

#### Heat energy

Calculate heat energy for known weight or volume flow rate, temperature difference and specific heat.

#### Resistance coefficient K

Calculate resistance coefficient K for most common local pipe resistances.

#### Venturi tube

Calculate flow rate through Venturi tube based on the created pressure drop by Venturi effect.

#### Nozzle flow

Calculate Nozzle flow rate for known pressure difference

## and even **more**...

#### LPG flow and combustion power

Calculate combustion power or flow rate of LPG. Calculate gas and phase pipe diameters

#### Prandtl probe and Pitot tube

Calculate velocity of fluid flow in pipe or open stream by measured dynamic pressure with Prandtl probe and Pitot tube

#### API and Baume specific gravitiy

Convert between API and Baume specific gravity. Calculator applicable for oils and other liquids

#### Combustion heat energy

Fuel combustion heat energy calculator is for calculation of heat energy (heat power) that is released during combustion of specified fuel for known fuel flow rate

## Fluid mechanics **learning**

Have a question about the site or calculators? Try to find the answer immediately on forum.

## Smart phone **Calculators**

#### Pipe diameter

Calculate pipe diameter for given flow rate. Applicable for liquids and gases.

#### Heat power

Calculate heat power for known flow rate and temperature difference in the heat exchanger

#### Reynolds number

Calculate Reynolds number of fluid flow for given flow velocity and fluid viscosity.