«

»

Print this Post

Water Pipe Sizing Calculation Example – Part 1: Overview

This water piping system design calculation example will use the Darcy-Weisbach equation to calculate the pressure loss in a pipe and using that value it will check the appropriateness of the assumed pipe size.

Problem Definition

 

 

 

 

 

 

 

 

Fig.1:Water Pipe Sizing Design Calculation Schematic

 

 

 

 

 

 

 

 

 

Refer the above schematics (Fig.1) and observe the following inputs:

Total pipe length=7 meters

Pressure head=5 meters

Number of ball valves=2

Number of Tee bend=1

Also assume that the required flow rate at the pipe end is 0.5 liter/sec.

Find out the appropriate pipe size

Solution

Following stepwise procedure needs to be followed for finding out the appropriate pipe size of this water pipe sizing calculation example:

Step-1: Assume the pipe diameter as 20 mm.

Step-2: Determine the Effective Pipe Length

Step-3: Determine the Permissible Pressure Loss

Step-4: Determine Hydraulic Diameter of the pipe

Step-5: Determine the Relative Roughness of the pipe

Step-6: Determine the Reynolds Number

Step-7: Determine the Moody friction factor using Moody diagram

Step-8: Determine the Actual Pressure Drop in the Pipe using Darcy-Weisbach equation and check if it is below the permissible pressure loss as calculated in step-3

In the next part (part-2) of this pipe size calculation series will discuss about calculating effective pipe length.


About 

Suvo is a production engineer by profession and writer/blogger by passion. Apart from maintaining this blog, he also get some freelance work like: Mechanical design, CAD, CAE, Assignment report writing, Website design.
Read More>>

    Find more about me on:
  • googleplus
  • twitter

1 comment

  1. Mithunmits20

    thanks for the article. it was really helpful.

Leave a Reply

%d bloggers like this:
Read more:
10 Different Types of Sheet Metal Forming Process and their Applications

Forming is the most widely used sheet metal operation used for manufacturing various sheet metal components across the industry.  ...

Close