Calculate Pipeline Length: Pressure Drop & Parameters Explained

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Calculating pipeline length typically requires knowing the pressure drop and the specific parameters of the system. The discussion highlights the challenge of determining pipeline length without initial data on pressure drop or length itself. Key inputs for calculating line friction include gas flow rate, pressure, temperature, molecular weight, compressibility, and viscosity, though there is uncertainty about the necessity of some parameters. The conversation also raises questions about the definition of "pipe friction," whether it refers to shear stress at the wall or the pressure gradient multiplied by the length of the pipe. Accurate calculations depend on clarifying these definitions and understanding the required inputs.
Amirul96
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Hi,

I want to ask how to calculate the length of pipeline..From what i have searched, one of the way to calculate it is from the equation of pressure drop. However, it seems i don't have info about the pipe length and pressure drop (it means i need to calculate it). Is it possible to calculate the pipe length without those two info?

As in the attachment are the type of parameter may related to calculate the length of pipeline

Regard,
Mirul
 

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What are you actually trying to calculate, and what are you given?
 
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Amirul96 said:
how to calculate the length of pipeline
Usually you are given the length of the pipeline as one of the first specifications. How can you not know how far you need to pipe your product?
 
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Chestermiller said:
What are you actually trying to calculate, and what are you given?

i want to calculate the line friction and i believe in order to calculate it i need the length of pipeline.
Capture 3.PNG


On the other side, the input are gas flowrate, pressure, temperature, molecular weight, compressibility and viscosity. However, i really doubt molecular weight, compressibility and viscosity are input and need to be calculate too.
Capture 4.PNG
 
Amirul96 said:
i want to calculate the line friction and i believe in order to calculate it i need the length of pipeline.
View attachment 266269

On the other side, the input are gas flowrate, pressure, temperature, molecular weight, compressibility and viscosity. However, i really doubt molecular weight, compressibility and viscosity are input and need to be calculate too.
View attachment 266270
What is your definition of the "pipe friction", the shear stress at the wall? Or is it the pressure gradient times the length of pipe?
 

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