## Featured Articles

Check out the latest featured articles.

## New Article

Product Viscosity vs. Shear

## Featured File

Vertical Tank Selection

## New Blog Entry

Low Flow in Pipes- posted in Ankur's blog

3

# Length Of Pipeline

4 replies to this topic
|

### #1 Mirul1996

Mirul1996

Brand New Member

• Members
• 4 posts

Posted 07 July 2020 - 04:28 AM

Hi,

I  want to ask how to calculate the length of pipeline? As in the attachment, the author got 1332.96 m. What is the formula/equation to calculate length of pipe?

In addition, i have attached spreadsheet that may contain some parameter to calculate the length of pipe.

### #2 breizh

breizh

Gold Member

• Forum Moderator
• 4,954 posts

Posted 07 July 2020 - 06:34 AM

Hi ,

To support your work consider the document attached .

Engineering is about hard work !

Hope you understand .

Breizh

### #3 Mirul1996

Mirul1996

Brand New Member

• Members
• 4 posts

Posted 08 July 2020 - 03:23 AM

Hi,

I believe this is the equation to calculate pressured drop and based on the pressure can get the length of pipe. i'm thinking the same but there is a bit confusion here.

I have do the calculation of pressure drop (kPa/100) by using ∆P = ρ x (v^2/2) x (f/d) where i get 7.73 kpa/100m as in the spreadsheet.

However, this calculation only can be calculate because i don't insert the pipe length.  When i insert length to this equation, it becomes

∆P = f x (L/D) X ρ x (v^2/2)

So how i want to calculate the pipe length when i don't know the length of pipe and the pressure drop?

Regard,

mirul

### #4 breizh

breizh

Gold Member

• Forum Moderator
• 4,954 posts

Posted 08 July 2020 - 05:30 AM

Hi ,

Either you know the length ( at least 100 m ) or you know the delta P! otherwise you cannot  solve your problem .

Are you sure you can apply the Darcy-Weisbach equation to your system ( compressible fluid)  ? At least you need to justify it.

Note : In the equation D-W L represents the pipe length , how do you integrate the fittings and other valves?

Probably good for you to review the equation using your favorite search engine.

Again ask help from your supervisor or any text book related to fluid dynamic.

Good luck

Breizh

Edited by breizh, 08 July 2020 - 05:37 AM.

### #5 Napo

Napo

Gold Member

• Members
• 342 posts

Posted 08 November 2020 - 03:50 PM

Murul1996,

Excuse me, Who is the author?, Where did you find the problem?, Can you give me the origin the problem (book, web, class, etc.)?.

Thanks.

Napo.