Calculate gas piping outlet pressure from the Panhandle equation (API RP 14E section 2.4). 
Compare results for the general equation (Moody diagram), the Weymouth equation, and the Panhandle A and B equations. 
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)