# Pressure drop calculators

## Calculator's 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 ## Pressure drop calculator

### for incompressible fluids

• Applicable for liquids and low pressure drop gas flow.
• Circular and rectangular closed pipe and duct,
• Incompressible flow ρ=const.,
• Colebrook-White equation based ## Gas pressure drop calculator

### for any perfect gas flow

• Applicable for any perfect gas in a long and closed round pipe.
• Compressible ρ≠const.
• Isothermal T=const. ## Compressible air flow

### pressure drop calculator

• Flow of air in a closed round pipe.
• Compressible flow ρ≠const.
• Isothermal flow T=const. ## High pressure natural gas

### pressure drop calculator

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

# Calculators for pressure differential devices

## Calculator's features:

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

### Calculate orifice diameters

• Quickly calculate the actual flow rate through the orifice
• Flow rate calculation from the measured pressure drop caused by the orifice plate inserted in the pipeline ## Venturi tube

### Venturi effect calculation

• Quickly calculate the actual flow rate through the Venturi tube
• Flow rate calculation from the measured pressure difference caused by the flow contraction ## Nozzle and Venturi nozzle

### Nozzle calculation

• Calculate flow rate using the static pressure difference between inlet pressure and pressure in the nozzle throat
• The calculation is according to ISO 5167-3 ## Prandtl probe - Pitot tube

### Calculate velocity

• Calculate flow velocity by measuring a difference between stagnation pressure and static pressure in a single point of a flow streamline
• Applicable for airflow in rectangular and round ducts

# Easy calculators for quick calculations ## Pipe diameter calculator

### Calculate flow velocity

• Quick pipe diameter calculation in closed, round, rectangular pipes and ducts
• Enter flow rate and velocity in text fields in the calculator and click calculate button to get results ## Resistance coefficient K

### Local pressure drop

• Resistance coefficient (or resistance factor) K calculation of fittings
• Should be used with pressure drop calculator or with gas compressible flow calculator ## Reynolds number

### Laminar or turbulent flow

• Analyze what makes fluid flow regime laminar and what is needed to force the fluid to flow in the turbulent regime
• Calculator for all fluids and flow rates without any restriction ## Thermal energy

### Calculate heat energy, thermal power and flow rate

• Calculator for heat power calculation, and the flow rate calculation
• Suitable for hot water boilers, water and air heat exchangers, chillers, heaters, and other equipment ## Gas offtake

### Calculate offtake of gas

• Calculation of gas outflow from the pipe or through the valve to the atmosphere or to a reservoir
• Calculate the maximum flow rate when you know pressure difference and pipe diameter ## LPG flow

### Calculate heat power and flow rate of LPG

• Calculate flow rate, pipe diameter and heat power of liquefied petroleum gas – LPG
• Determine flow rate of an LPG in a gas furnace, for burner heat power ## Control valve sizing calculator

### Calculate flow coefficient

• Calculate maximum flow rate through valve for pressure drop and flow coefficient Cv
• Compare control valves from different manufacturers ## Gas control valve sizing calculator

### Calculate flow coefficient

• Calculate valve capacity for given upstream and downstream pressure and known Cg or Kg
• The calculator is in line with the standard EN334