The IGT Distribution Equation for Natural Gas Flow

I've previously blogged on the Weymouth and Panhandle A & B equations to predict the flow of natural gas through pipelines. Today, I'll complete this series of posts by presenting an Excel spreadsheet that calculates the IGT Equation (also known as the IGT Distribution Equation) for the flow of natural gas. The equation is particularly suitable for high pressure, high flowrates through steel or plastic/polyethylene pipes.

The spreadsheet allows you to choose between several units, and takes care of all unit conversions behind the scenes. It also enables you to model the effect of elevation changes on flowrates.

This is the IGT Equation as implemented in the spreadsheet (notation is defined here)

The IGT Distribution Equation for Natural Gas Flow

I've previously blogged on the Weymouth and Panhandle A & B equations to predict the flow of natural gas through pipelines. Today, I'll complete this series of posts by presenting an Excel spreadsheet that calculates the IGT Equation (also known as the IGT Distribution Equation) for the flow of natural gas. The equation is particularly suitable for high pressure, high flowrates through steel or plastic/polyethylene pipes.

The spreadsheet allows you to choose between several units, and takes care of all unit conversions behind the scenes. It also enables you to model the effect of elevation changes on flowrates.

This is the IGT Equation as implemented in the spreadsheet (notation is defined here)

I've previously blogged on the Weymouth and Panhandle A & B equations to predict the flow of natural gas through pipelines. Today, I'll complete this series of posts by presenting an Excel spreadsheet that calculates the IGT Equation (also known as the IGT Distribution Equation) for the flow of natural gas. The equation is particularly suitable for high pressure, high flowrates through steel or plastic/polyethylene pipes.

The spreadsheet allows you to choose between several units, and takes care of all unit conversions behind the scenes. It also enables you to model the effect of elevation changes on flowrates.

I've previously blogged on the Weymouth and Panhandle A & B equations to predict the flow of natural gas through pipelines. Today, I'll complete this series of posts by presenting an Excel spreadsheet that calculates the IGT Equation (also known as the IGT Distribution Equation) for the flow of natural gas. The equation is particularly suitable for high pressure, high flowrates through steel or plastic/polyethylene pipes.

I've previously blogged on the Weymouth and Panhandle A & B equations to predict the flow of natural gas through pipelines. Today, I'll complete this series of posts by presenting an Excel spreadsheet that calculates the IGT Equation (also known as the IGT Distribution Equation) for the flow of natural gas. The equation is particularly suitable for high pressure, high flowrates through steel or plastic/polyethylene pipes.

The IGT Distribution Equation

ParametersInlet pressure (absolute) 1014.7Outlet pressure (absolute) 814.7Pressure, std condition (absolute) 14.7Temperature std condition (absolute) 520Mean temperature of line (absolute) 540Inside diameter 15.5Pipe length 15Gas relative density (air=1) 0.6Mean gas compressibility 0.95Pipeline efficiency 0.95Mean gas viscosity 0.000008Elevation of exit above entrance 0

ResultFlowrate (std conditions) 2.6289E+08

For more engineering spreadsheets go to http://excelcalculations.blogspot.com

Pressure units Temperature Units Length units

psia F inPa K m

miles

Inlet pressureOutlet pressurePressure, std conditionTemperature std conditionMean temperature of lineInside diameterPipe lengthViscosityGas relative density (air=1)Mean gas compressibilityPipeline efficiencyPipe effective roughnessMean gas viscositysLeIGT Equation

Viscosity Volume flowrate

Pa s ft^3/daylb/ft s m^3/s

Unit Value in Imperial1 1014.71 814.71 14.71 5201 5401 15.53 15

2 0.0000081 0

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