Pipeng Toolbox : Gas Pipe Weymouth Panhandle Calculators Blank User
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Gas Pipeline Pressure Loss From The Weymouth And Panhandle Equation

Calculate pressure loss for single phase gas pipelines using either the Weymouth equation, the Panhandle A equation, the Panhandle B equation, or the general equation (user defined Darcy friction factor).

`Q = 77.57 ((Tb) / (Pb)) ((P^2 - ess. Po^2) / (SG .T. L. ls Z. fd))^0.5 D^2.5 `General ` `
`Q = 433.5 ((Tb) / (Pb)) E ((P^2 - ess. Po^2) / (SG .T. L. ls. Z))^0.5 D^2.667 `Weymouth` `
`Q = 437.87 ((Tb) / (Pb))^1.0788 E ((P^2 - ess. Po^2) / (SG^0.8539. T .L. ls. Z))^0.5394 D^2.6182 `Panhandle A` `
`Q = 738.73 ((Tb) / (Pb))^1.02 E ((P^2 - ess. Po^2) / (SG^0.961. T. L. ls. Z))^0.51 D^2.53 `Panhandle B` `
`ss = (z2 - z2) SG. mma. g / (Ro T Z) `
`es = exp(ss) `
`ls = (es^2 - 1) / (ss) `

where :

Q = mole flowrate (SCFD)
Po = outlet pressure (psia)
P = inlet pressure (psia)
Tb = base temperature (60 F)
Pb = base pressure (1 atm)
fd = Darcy friction factor
E = efficiency factor
L = piping length (mi)
D = piping inside diameter (in)
K = total friction loss factor for fittings
g = gravity constant
zi = inlet elevation
zo = outlet elevation
ss = elevation exponent
es = elevation pressure factor
ls = elevation length factor

Pipe roughness can be accounted for using the efficiency factor. Minor losses such as bends, valves, tees and other pipe fittings should be included by adding a minor loss equivalent length to the pipeline length. The calculations are not suitable for laminar flow.

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CALCULATOR : Single Phase Gas Pipeline Pressure Loss From Weymouth Panhandle A And Panhandle B Equation [PLUS]   ±

Calculate gas pipeline outlet pressure from flow rate and diameter using either the Weymouth equation, the Panhandle A, the Panhandle B equation, or the general equation with user defined friction factor.

For the Weymouth equation, the Panhandle A, the Panhandle B equation the pipe roughness is accounted for by the efficiency factor. The equivalent Darcy friction factor includes the effect of the efficiency factor. Valves, tees and other pipe fittings should be accounted for by adding a minor loss equivalent length to the pipeline length.

Tool Input

  • schdtype : Pipe Schedule Type
  • diamtype : Pipe Diameter Type
    • ODu : User Defined Outside Diameter
    • IDu : User Defined Inside Diameter
  • wtntype : Wall Thickness Type
    • tnu : User Defined Wall Thickness
  • fluidtype : Fluid Property Type
    • SGu : User Defined Gas Specific Gravity
  • voltype : Fluid Flow Rate Type
    • Qfu : User Defined Gas Volume Flow Rate
    • Mfu : User Defined Gas Mass Flow Rate
    • Ngu : User Defined Gas Mole Flow Rate
    • Vfu : User Defined Gas Velocity
  • efactype : Efficiency Factor Type
    • Eu : User Defined Efficiency Factor
  • fdtype : Darcy Friction Factor Type
    • fdu : User Defined Darcy Friction Factor
  • flowtype : Fluid Pressure Type
  • L : Pipe Length
  • zi : Inlet Elevation Relative To Datum
  • zo : Outlet Elevation Relative To Datum
  • Pi : Inlet Pressure
  • T : Fluid Temperature
  • Z : Compressibility Factor

Tool Output

  • ΔP : Friction Pressure Loss
  • ρ : Fluid Density (At Pf)
  • E : Efficiency Factor
  • ID : Inside Diameter
  • Mf : Mass Flowrate
  • Ng : Mole Flow Rate
  • Pa : Average Fluid Pressure
  • Pf : Pressure For Fluid Property Calculation
  • Po : Outlet Pressure
  • Qf : Volume Flowrate (At Pf)
  • SG : Gas Specific Gravity
  • Vf : Fluid Velocity (At Pf)
  • es : Elevation Constant
  • fd : Darcy Friction Factor
  • ff : Fanning Friction Factor
  • ls : Length Constant
  • ss : Elevation Exponent
  • td : Darcy Transmission Factor
  • tf : Fanning Transmission Factor
  • vg : Mole Specific Volume (At Pf)
CALCULATOR : Single Phase Gas Pipeline Pressure Loss General [FREE]   ±

Calculate general gas pipeline outlet pressure from flow rate and diameter using the Moody diagram.

The Moody diagram combines the Hagen-Poiseuille laminar flow equation with the Colebrook White turbulent flow equation (either the original Colebrook White equation or the modified Colebrook White equation). Bends, valves, tees and other pipe fittings should be accounted for using the minor loss K factor.

Tool Input

  • fdtype : Darcy Friction Factor Type
    • fdu : User Defined Darcy Friction Factor
  • flowtype : Pressure For Fluid Property Calculation
  • ID : Pipe Inside Diameter
  • r : Piipe Internal Roughness
  • L : Pipe Length
  • K : K Factor
  • zi : Inlet Elevation Relative To Datum
  • zo : Outlet Elevation Relative To Datum
  • Pi : Inlet Pressure
  • T : Fluid Temperature
  • Z : Compressibility Factor
  • SG : Gas Specific Gravity (At Pf)
  • μ : Dynamic Viscosity
  • Ng : Mole Flow Rate

Tool Output

  • ΔP : Friction Pressure Loss
  • ρ : Fluid Density (At Pf)
  • Pa : Average Fluid Pressure
  • Pf : Pressure For Fluid Property Calculation
  • Po : Outlet Pressure
  • Re : Reynolds Number (At Inlet)
  • cvg : Convergence Factor (≅ 1)
  • fd : Darcy Friction Factor
  • rr : Surface Roughness Ratio
  • vg : Mole Specific Volume (At Pf)
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