Published by Aislan Zapzalka
What the relationship between the radius and the deflection angle and concentrated loss head, especially for bended large pipes when the fluid is water.
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.
Published by John Divit, Severn Trent Water - Leakage Best Practice Advisor
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
Published by Ehteshamul haqh qhazi Wallis, zarna water technology ZWT
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.
Published by Steve Oxtoby, Process Engineer
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.
Published by Liang Qiao, Chief Process Specialist at ZJ High New Pty Ltd
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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Published by Guy McGowen, President/CEO/Chief Science Officer
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
Published by John Salonich, Vice President / Managing Director
Hazen Williams is a friction calculation. head loss around a bend is a momentum change and so it is not applicable
Published by Steve Oxtoby, Process Engineer
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.
Published by RADHAKRISHNA MURTHY GUNTUPALLI, Regional Head at Gammon Engineers & Contractors Pvt Ltd