Head loss in Pipes

In previous posts we have already discussed major losseses in pipes, Hagen Poiseuille & Darcy Weisbach equation to calculate head loss.

For minor losses there are direct formulas that need to be remembered

Minor Loss

1. Loss due to sudden Enlargement

 

2. Loss due to sudden Conraction

v2 is the velocity in the contracted region.
Case 1 & 2 are between pipe to pipe

3. Loss of head at the Entrance of Pipe

251

4. Loss of head at the Exit of Pipe

252

Case 3 & 4 are between pipe & tank

Now we will calculate the losses when we are combining pipes

Pipes can be combined in series, parallel or both.

1) Pipes in series

Note: As the pipe are in series, the discharge through each pipe will be same

254
Total Head Loss = Major loss + Minor loss
Major loss = Head loss due to friction in each pipe
256
Major loss = Entrance loss + Expansion loss + Contraction loss + Exit loss
257
Total Head Loss = Major loss + Minor loss

2) Pipes in parallel

Note: As the pipe are in parallel, the discharge through each pipe will be sum of discharge through main pipe

258

Loss of head in each pipe will be same in parallel

260

3)Equivalent Pipe

A compound pipe which consists of several pipes of different lengths and diameters to be replaces by one equivalent pipe having uniform diameter and same length is known as equivalent pipe or in other words single pipe representing combination of pipes.

261

Special Case:

Searching for particular topic?

I hope you like this section. Please share with friends and like my Facebook page and never miss an update.

Share the knowledge
Share the knowledge