Natural Gas Modules

Calculate single phase gas pipeline pressure loss using the Darcy Weisbach equation.

`Po = √(P^2 - m^2(fd.L / D + K) ls (16mma.SG.ZRoT)/(pi^2D^4) ) / (es) `
`ss = (z2 - z2) SG.mma.g / (Ro T Z) `
`es = e^(ss) `
`ls = (es^2 - 1) / (ss) `

where :

Po = outlet pressure
P = inlet pressure
fd = Darcy friction factor
L = piping length
D = piping inside diameter
K = total friction loss factor for fittings
m = gas mole flowrategas
mma = air molar mass
SG = gas specific gravity
Z = gas compressibility factor
Ro = universal gas constant
T = gas temperature
g = gravity constant
zi = inlet elevation
zo = outlet elevation
ss = elevation exponent
es = elevation pressure factor
ls = elevation length factor

For low Reynolds numbers Re < 2000, the fluid flow is laminar and the Darcy friction factor should be calculated using the Hagen-Poiseuille laminar flow equation. For high Reynolds numbers Re > 4000, the fluid flow is turbulent and the Darcy friction factor should be calculated using one of the turbulent flow equations. In the transition region 2000 < Re < 4000, the flow is unstable and the friction loss cannot be reliably calculated. The minor loss K factor is used to account for pipeline fittings such as bends, tees, valves etc..

The calculators use the Darcy-Weisbach pressure loss equation with the Darcy friction factor. The Fanning transmission factor combined with the Fanning equation is commonly used for gas flow. The results for the Darcy and Fanning equations are identical provided that the correct friction factor is used.

The gas specific gravity is the ratio of gas density over the density of dry air at base temperature and pressure. The compressibility factor is assumed to equal 1 at the base conditions. The gas specific gravity is proportional to the gas molar mass.

Change Module :

• Gas Pipeline Blowdown Time Calculation Module
• Gas Pipeline Chemical Dose Rate Calculation Module
• Gas Pipeline Fluid Density And Specific Gravity Calculation Module
• Gas Pipeline Fluid Mass And Volume Calculation Module
• Gas Pipeline Fluid Velocity And Flow Rate Calculation Module
• Gas Pipeline Line Pack Calculation Module
• Gas Pipeline Local Pressure Calculation Module
• Gas Pipeline Mass And Weight Calculation Module
• Gas Pipeline Minor Loss Factor Calculation Module
• Gas Pipeline Pressure Loss From The AGA Equation Calculation Module
• Gas Pipeline Pressure Loss From The Moody Diagram Calculation Module
• Gas Pipeline Pressure Loss From The Weymouth And Panhandle Equation Calculation Module
• Gas Pipeline Vent Calculation Module
• Gas Rectangular Duct Pressure Loss Calculation Module
• Low Pressure Air Pressure Loss From The Moody Diagram Calculation Module
• All

Related Modules :

• Gas Compressibility Factor Calculation Module
• Line Pipe Cross Section Calculation Module
• Liquid Kinematic And Dynamic Viscosity Calculation Module
• More Pipeline Schedule Modules

Fluid density and specific gravity data.

For gases, the specific gravity is generally measured relative to air. For liquids, the specific gravity is generally measured relative to water.

Related Modules :

• Fluid Compressibility Factor Data Module
• Fluid Critical Point And Molar Mass Data Module
• Fluid Density And Volume Calculation Module
• Fluid Dynamic And Kinematic Viscosity Data Module
• Fluid Specific Heat Capacity Data Module
• Fluid Surface Tension Data Module
• Fluid Thermal Expansion Coefficient Data Module
• Fluid Vapour Pressure Data Module
• Methane Gas And Liquid Data Module
• Yaws Critical Point And Accentric Factor Data Module
• More Fluid Density Modules