Loss of Head in Bended Pipes
Published on by Aislan Zapzalka in Technology
What the relationship between the radius and the deflection angle and concentrated loss head, especially for bended large pipes when the fluid is water.
Taxonomy
- Pipes Design
- Integrated Infrastructure
- Urban Water Infrastructure
- Infrastructure Management
- Backflow
- Pipeline Installation & Maintenance
- Pipelines
- Pipes and Pipelines
8 Answers
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Good suppliers generally provide a frictional coefficient (K factor) for all of their fittings. These are different for all makers, fittings, sizes and angles. Use these values in your model, and it will give you pretty good indication of hydraulic performance.
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Hi aisaln
When every the elbows are there the head pressure will decrease by 3 ft(feet) so you can calculate you will get a approx valve of head loss
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The best source for this is DS Miller Internal Flow Systems. This has a lot on standard and non standard fittings that can have a K factor derived from one of the many charts.
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Check the K value of the pipe fitting with manufacturer. H = K*V*V/（2G）. Different bend and pipe material has a different K value.
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Head Losses, caused by bends, elbows, joints, valves etc., in pipelines are sometimes more important than the lossses due to pipe friction but the name is conventional. In almost all cases the minor loss is determined by experiment.
The problem of Bends has been thoroughly investigated and many of interesting facts have been discovered. For example, when a fluid passes around a bend (viscous/turbulent flow) a condition called secondary flow will be established: a rotating motion (due to the centrifugal force combined with the frictional resistance of the pipe walls) at right angles to the pipe axis which is superimposed on the main motion in the axis direction.
The total loss is equal to the sum of the excess loss in downstream tangent, the loss due to curvature (radius, deflection angle) and loss in bend due to length.
To clarify the prolem, I suggest for you to read chapter two of the book: "Flow of fluids through valves , fittings , and pipe " / Crane Co London : Crane Co., - Technical paper. No. 410 M, . 1985.
Regards
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Pipes were intended to take advantage of the uninterrupted flow of fluids to their destination. Any angles reduce not only the speed of the flow but also cause blockage and a negative bio electric discharge. I am sure you familiar with a cool dry day walk across your living room carpet and build up a charge. Touch someone and they will receive that negative charge loud and clear. Reduce the intensity and then allow fluids to pass through your household. Go ahead and take an electrical measurement. no one can stop the sun from affecting of normal climate cycle. But you can eliminate water shortages, declining health issues, and food shortages. Water plays an important part in this. In concert with RNA microbial groups you will find answers to all of your questions. Send me a request for info. I will send it to you and if you have skype we can ask/answers questions much faster. guy_mcgowen
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Tha Hazen-Williams Equation is used for the calculations to generate head loss of fluids in pipe. Here's a link in the Engineering Toolbox to the formula: http://www.engineeringtoolbox.com/hazen-williams-water-d_797.html
1 Comment
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Hazen Williams is a friction calculation. head loss around a bend is a momentum change and so it is not applicable
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Generally losses are more in bends of less than 90 degrees.
Losses are minimum when angle of bend is more than 135 degrees.
This is valid for all fluids.