Special Case: Loss of head due to friction in a pipe with Side Tappings

Article by: 
Rahul Kumar (IES 2017 AIR-50, ISRO AIR-2)

Estimated reading time: 3 minutes.

If there are side tappings in a pipe along the length through which liquid may be withdrawn from pipe then the velocity of flow will vary across the length of the pipe and so the head loss will also vary.


  • The tappings are closely spaced
  • The value of the friction factor “f” is constant throughout the pipe

Let the liquid removed from the pipe is q per unit length.


CONCLUSION: Head loss is case of tapped pipe is one third of the pipe without tapping.


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