Calculate Pipeline Length: Pressure Drop & Parameters Explained

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Discussion Overview

The discussion revolves around the calculation of pipeline length in relation to pressure drop and other parameters. Participants explore whether it is feasible to determine pipeline length without direct information on pressure drop and length itself, while also addressing the factors that influence line friction.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant questions the feasibility of calculating pipeline length without knowing the pressure drop and length itself.
  • Another participant emphasizes that pipeline length is typically provided as a specification and expresses confusion over the lack of this information.
  • A participant mentions the need to calculate line friction, suggesting that pipeline length is essential for this calculation.
  • Inputs for the calculation are proposed to include gas flowrate, pressure, temperature, molecular weight, compressibility, and viscosity, though there is skepticism about the necessity of molecular weight, compressibility, and viscosity as inputs.
  • There is a query regarding the definition of "pipe friction," with distinctions made between shear stress at the wall and the pressure gradient multiplied by the length of the pipe.

Areas of Agreement / Disagreement

Participants express differing views on the necessity of knowing pipeline length and pressure drop for calculations, indicating that multiple competing perspectives remain unresolved.

Contextual Notes

There are limitations regarding the assumptions about the inputs needed for calculations, particularly concerning molecular weight, compressibility, and viscosity, which are not universally agreed upon.

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
 

Attachments

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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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