Pipe flow calculators

LPG pipe diameter calculator


Calculator Description

Calculator can be used for calculation of flow rate, pipe diameter and heat power of liquefied petroleum gas - LPG.

  • Calculate:

    • LPG weight and volumetric flow rate
    • Internal pipe diameter of liquid and gas phase
    • LPG mixture gas constant
  • Input:

    • Heat power of LPG
    • Flow velocity
    • Propane - butane mixture ratio
    • Gas pressure
    • Gas temperature

Calculator Features

  • For gas and liquid phase of LPG
  • Calculation for specified propane butane mixture ratio
  • LPG heat power calculation included

Liquefied petroleum gas is mixture of propane, butane and other components. LPG flow rate and pipe diameter calculator is applicable for calculation of flow rate and heat power of gas and liquid phase of LPG. Calculator can be used for calculation of clear propane or clear butane gas flow as well.

Propane and butane in gas state are compressible. When liquid mixture of propane and butane is calculated, LPG is considered as incompressible. All physical properties, like mixture density or partial pressure, are calculated for the given propane - butane mixture.

Calculator can be used for calculation of pipe diameter, when flow rate is known. Flow rate of lpg can be given as weight flow rate, volume flow rate of liquid phase or as volume flow rate of gas phase at normal conditions.

Also, if lpg is used as fuel in gas furnace, for known burner heat power, required flow rate of lp gas can be calculated. Calculator for LPG - liquefied petroleum gas flow rate and pipe diameter calculation can be used for conversions between weight and volume flow rate (liquid or gas phase). Gas phase flow rate of LPG is calculated at normal conditions: pressure (atmospheric) p = 101325 Pa and temperature T=273.15 K


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If you would like to use the calculator, but actually can't see the blue CALCULATOR button in the upper left part of the page than please read instructions.

Q: Calculate flow rate and pipe diameter for LPG installation that should deliver LPG as fuel to burner with 2000 kW capacity. LPG in gas state is under 1.113 bar absolute pressure and temperature is 288 K. LPG is mixture of 50% propane and 50% butane

A: Calculation setup:
Input values:
P = 2000 kW
Vgas = 10 m/s (recomended)
Vliq = 1 m/s (recomended)
p = 1.113 bar
T = 288 K

Q: Calculate combustion power that can be created from burning 10 kg/h of LPG (30-70% propane butane mixture) and LPG pipe line dimension for recomended flow velocities of 10 m/s for gas phase and 1 m/s for liquid phase of LPG.

A: Calculation setup:
Input values:
w = 10 kg/h
V gas = 10 m/s (recomended)
V liq = 1 m/s (recomended)
p = 1.113 bar
T = 288 K

Q: Calculate flow rate and flow velocities for LPG installation that should deliver LPG as fuel to burner with 1200 kW capacity. LPG in gas state is under 1.113 bar absolute pressure and temperature is 288 K. LPG is mixture of 30% propane and 70% butane. Inside pipe diameters are 20 mm for gas phase and 10 mm for liquid phase.

A: Calculation setup:
Input values:
P = 1200 kW
D gas = 20 mm
D liq = 10 mm
p = 1.113 bar
T = 288 K

Calculation of physical properties of LPG mixture (propane - butane) is based on following equation:

Read more about used theory on fluid properties page page.

If you experience problems with calculator start try to find answers on instructions page.

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